diff --git a/dist/simple-react-validator.js b/dist/simple-react-validator.js
index 577829d..a8647f1 100644
--- a/dist/simple-react-validator.js
+++ b/dist/simple-react-validator.js
@@ -83,6 +83,9 @@ function () {
       isBlank: function isBlank(value) {
         return typeof value === 'undefined' || value === null || value === '';
       },
+      isAsync: function isAsync(rule, rules) {
+        return rules[rule].hasOwnProperty('asyncRule');
+      },
       normalizeValues: function normalizeValues(value, validation) {
         return [this.valueOrEmptyString(value), this.getValidation(validation), this.getOptions(validation)];
       },
@@ -162,6 +165,7 @@ function () {
     this.fields = {};
     this.visibleFields = [];
     this.errorMessages = {};
+    this.asyncValidators = {};
     this.messagesShown = false;
     this.rules = _objectSpread({
       accepted: {
@@ -468,6 +472,37 @@ function () {
 
       return true;
     }
+  }, {
+    key: "asyncValid",
+    value: function asyncValid(completion) {
+      this.failedAsyncValidator = null;
+      if (!this.allValid()) return completion.fail();
+      if (Object.keys(this.asyncValidators).length === 0) return completion.pass();
+      this.currentAsyncValidator = Object.keys(this.asyncValidators)[0];
+      var validator = this.asyncValidators[this.currentAsyncValidator];
+      validator.rules[validator.rule].asyncRule(validator.value, validator.params, this, completion);
+    }
+  }, {
+    key: "pass",
+    value: function pass(completion) {
+      var keys = Object.keys(this.asyncValidators);
+      var index = keys.indexOf(this.currentAsyncValidator);
+
+      if (index >= keys.length - 1) {
+        return completion.pass();
+      } else {
+        this.currentAsyncValidator = keys[index + 1];
+        var validator = this.asyncValidators[this.currentAsyncValidator];
+        validator.rules[validator.rule].asyncRule(validator.value, validator.params, this, completion);
+      }
+    }
+  }, {
+    key: "fail",
+    value: function fail(completion) {
+      var validator = this.asyncValidators[this.currentAsyncValidator];
+      this.failedAsyncValidator = this.currentAsyncValidator;
+      completion.fail();
+    }
   }, {
     key: "fieldValid",
     value: function fieldValid(field) {
@@ -524,19 +559,19 @@ function () {
               rule = _this$helpers$normali2[1],
               params = _this$helpers$normali2[2];
 
-          if (!this.helpers.passes(rule, value, params, rules)) {
-            this.fields[field] = false;
-            var message = this.helpers.message(rule, field, options, rules);
-
-            if (params.length > 0 && rules[rule].hasOwnProperty('messageReplace')) {
-              message = rules[rule].messageReplace(message, params);
-            }
-
-            this.errorMessages[field] = message;
+          if (this.helpers.isAsync(rule, rules)) {
+            this.asyncValidators["".concat(field, ":").concat(rule)] = {
+              value: value,
+              rule: rule,
+              params: params,
+              field: field,
+              options: options,
+              rules: rules
+            };
+          }
 
-            if (this.messagesShown || this.visibleFields.includes(field)) {
-              return this.helpers.element(message, options);
-            }
+          if (!this.helpers.passes(rule, value, params, rules) || this.helpers.isAsync(rule, rules) && this.failedAsyncValidator == "".concat(field, ":").concat(rule)) {
+            return this.fieldFailure(field, rule, rules, options, params);
           }
         }
       } catch (err) {
@@ -554,6 +589,22 @@ function () {
         }
       }
     }
+  }, {
+    key: "fieldFailure",
+    value: function fieldFailure(field, rule, rules, options, params) {
+      this.fields[field] = false;
+      var message = this.helpers.message(rule, field, options, rules);
+
+      if (params.length > 0 && rules[rule].hasOwnProperty('messageReplace')) {
+        message = rules[rule].messageReplace(message, params);
+      }
+
+      this.errorMessages[field] = message;
+
+      if (this.messagesShown) {
+        return this.helpers.element(message, options);
+      }
+    }
   }]);
 
   return SimpleReactValidator;
diff --git a/dist/simple-react-validator.min.js b/dist/simple-react-validator.min.js
index c589753..1956928 100644
--- a/dist/simple-react-validator.min.js
+++ b/dist/simple-react-validator.min.js
@@ -1,2 +1,2 @@
 // Simple React Validator v1.2.0 | Created By Dockwa | MIT License | 2017 - Present
-!function(e,t){"function"==typeof define&&define.amd?define(["react"],t):"object"==typeof exports?module.exports=t(require("react")):e.SimpleReactValidator=t(e.React)}(this,function(n){"use strict";function g(e,t){return function(e){if(Array.isArray(e))return e}(e)||function(e,t){var r=[],s=!0,n=!1,a=void 0;try{for(var i,u=e[Symbol.iterator]();!(s=(i=u.next()).done)&&(r.push(i.value),!t||r.length!==t);s=!0);}catch(e){n=!0,a=e}finally{try{s||null==u.return||u.return()}finally{if(n)throw a}}return r}(e,t)||function(){throw new TypeError("Invalid attempt to destructure non-iterable instance")}()}function a(e){return(a="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function b(t){for(var e=1;e<arguments.length;e++){var r=null!=arguments[e]?arguments[e]:{},s=Object.keys(r);"function"==typeof Object.getOwnPropertySymbols&&(s=s.concat(Object.getOwnPropertySymbols(r).filter(function(e){return Object.getOwnPropertyDescriptor(r,e).enumerable}))),s.forEach(function(e){i(t,e,r[e])})}return t}function s(e,t){for(var r=0;r<t.length;r++){var s=t[r];s.enumerable=s.enumerable||!1,s.configurable=!0,"value"in s&&(s.writable=!0),Object.defineProperty(e,s.key,s)}}function e(e,t,r){return t&&s(e.prototype,t),r&&s(e,r),e}function i(e,t,r){return t in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r,e}var t=function(){function s(){var r=this,e=0<arguments.length&&void 0!==arguments[0]?arguments[0]:{};!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,s),i(this,"showMessageFor",function(e){r.visibleFields.push(e),r.helpers.forceUpdateIfNeeded()}),i(this,"hideMessageFor",function(e){var t=r.visibleFields.indexOf(e);-1<t&&r.visibleFields.splice(t,1),r.helpers.forceUpdateIfNeeded()}),i(this,"helpers",{parent:this,passes:function(e,t,r,s){return s.hasOwnProperty(e)?!(this.isRequired(e,s)||!this.isBlank(t))||!1!==s[e].rule(t,r,this.parent):(console.error("Rule Not Found: There is no rule with the name ".concat(e,".")),!0)},isRequired:function(e,t){return t[e].hasOwnProperty("required")&&t[e].required},isBlank:function(e){return null==e||""===e},normalizeValues:function(e,t){return[this.valueOrEmptyString(e),this.getValidation(t),this.getOptions(t)]},getValidation:function(e){return e===Object(e)&&Object.keys(e).length?Object.keys(e)[0]:e.split(":")[0]},getOptions:function(e){if(e===Object(e)&&Object.values(e).length){var t=Object.values(e)[0];return Array.isArray(t)?t:[t]}return 1<(t=e.split(":")).length?t[1].split(","):[]},valueOrEmptyString:function(e){return null==e?"":e},toSentence:function(e){return e.slice(0,-2).join(", ")+(e.slice(0,-2).length?", ":"")+e.slice(-2).join(2<e.length?", or ":" or ")},testRegex:function(e,t){return null!==e.toString().match(t)},forceUpdateIfNeeded:function(){this.parent.autoForceUpdate&&this.parent.autoForceUpdate.forceUpdate()},message:function(e,t,r,s){r.messages=r.messages||{};var n=r.messages[e]||r.messages.default||this.parent.messages[e]||this.parent.messages.default||s[e].message;return n.replace(":attribute",this.humanizeFieldName(t))},humanizeFieldName:function(e){return e.replace(/([A-Z])/g," $1").replace(/_/g," ").toLowerCase()},element:function(e,t){var r=t.element||this.parent.element;return r(e,t.className)},numeric:function(e){return this.testRegex(e,/^(\d+.?\d*)?$/)},momentInstalled:function(){return!(!window||!window.moment)||(console.warn("Date validators require using momentjs https://momentjs.com and moment objects."),!1)},size:function(e,t){return"string"===t||void 0===t||"array"===t?e.length:"num"===t?parseFloat(e):void 0},sizeText:function(e){return"string"===e||void 0===e?" characters":"array"===e?" elements":""}}),this.fields={},this.visibleFields=[],this.errorMessages={},this.messagesShown=!1,this.rules=b({accepted:{message:"The :attribute must be accepted.",rule:function(e){return!0===e},required:!0},after:{message:"The :attribute must be after :date.",rule:function(e,t){return r.helpers.momentInstalled()&&moment.isMoment(e)&&e.isAfter(t[0],"day")},messageReplace:function(e,t){return e.replace(":date",t[0].format("MM/DD/YYYY"))}},after_or_equal:{message:"The :attribute must be after or on :date.",rule:function(e,t){return r.helpers.momentInstalled()&&moment.isMoment(e)&&e.isSameOrAfter(t[0],"day")},messageReplace:function(e,t){return e.replace(":date",t[0].format("MM/DD/YYYY"))}},alpha:{message:"The :attribute may only contain letters.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z]*$/i)}},alpha_space:{message:"The :attribute may only contain letters and spaces.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z\s]*$/i)}},alpha_num:{message:"The :attribute may only contain letters and numbers.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z0-9]*$/i)}},alpha_num_space:{message:"The :attribute may only contain letters, numbers, and spaces.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z0-9\s]*$/i)}},alpha_num_dash:{message:"The :attribute may only contain letters, numbers, and dashes.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z0-9_-]*$/i)}},alpha_num_dash_space:{message:"The :attribute may only contain letters, numbers, dashes, and spaces.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z0-9_-\s]*$/i)}},array:{message:"The :attribute must be an array.",rule:function(e){return Array.isArray(e)}},before:{message:"The :attribute must be before :date.",rule:function(e,t){return r.helpers.momentInstalled()&&moment.isMoment(e)&&e.isBefore(t[0],"day")},messageReplace:function(e,t){return e.replace(":date",t[0].format("MM/DD/YYYY"))}},before_or_equal:{message:"The :attribute must be before or on :date.",rule:function(e,t){return r.helpers.momentInstalled()&&moment.isMoment(e)&&e.isSameOrBefore(t[0],"day")},messageReplace:function(e,t){return e.replace(":date",t[0].format("MM/DD/YYYY"))}},between:{message:"The :attribute must be between :min and :max:type.",rule:function(e,t){return r.helpers.size(e,t[2])>=parseFloat(t[0])&&r.helpers.size(e,t[2])<=parseFloat(t[1])},messageReplace:function(e,t){return e.replace(":min",t[0]).replace(":max",t[1]).replace(":type",r.helpers.sizeText(t[2]))}},boolean:{message:"The :attribute must be a boolean.",rule:function(e){return!1===e||!0===e}},card_exp:{message:"The :attribute must be a valid expiration date.",rule:function(e){return r.helpers.testRegex(e,/^(([0]?[1-9]{1})|([1]{1}[0-2]{1}))\s?\/\s?(\d{2}|\d{4})$/)}},card_num:{message:"The :attribute must be a valid credit card number.",rule:function(e){return r.helpers.testRegex(e,/^\d{4}\s?\d{4,6}\s?\d{4,5}\s?\d{0,8}$/)}},currency:{message:"The :attribute must be a valid currency.",rule:function(e){return r.helpers.testRegex(e,/^\$?(\d{1,3})(\,?\d{3})*\.?\d{0,2}$/)}},date:{message:"The :attribute must be a date.",rule:function(e){return r.helpers.momentInstalled()&&moment.isMoment(e)}},date_equals:{message:"The :attribute must be on :date.",rule:function(e,t){return r.helpers.momentInstalled()&&moment.isMoment(e)&&e.isSame(t[0],"day")},messageReplace:function(e,t){return e.replace(":date",t[0].format("MM/DD/YYYY"))}},email:{message:"The :attribute must be a valid email address.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z0-9.!#$%&'*+-/=?^_`{|}~]+@[A-Z0-9.-]+\.[A-Z]{2,}$/i)}},in:{message:"The selected :attribute must be :values.",rule:function(e,t){return-1<t.indexOf(e)},messageReplace:function(e,t){return e.replace(":values",r.helpers.toSentence(t))}},integer:{message:"The :attribute must be an integer.",rule:function(e){return r.helpers.testRegex(e,/^\d*$/)}},max:{message:"The :attribute may not be greater than :max:type.",rule:function(e,t){return r.helpers.size(e,t[1])<=parseFloat(t[0])},messageReplace:function(e,t){return e.replace(":max",t[0]).replace(":type",r.helpers.sizeText(t[1]))}},min:{message:"The :attribute must be at least :min:type.",rule:function(e,t){return r.helpers.size(e,t[1])>=parseFloat(t[0])},messageReplace:function(e,t){return e.replace(":min",t[0]).replace(":type",r.helpers.sizeText(t[1]))}},not_in:{message:"The selected :attribute must not be :values.",rule:function(e,t){return-1===t.indexOf(e)},messageReplace:function(e,t){return e.replace(":values",r.helpers.toSentence(t))}},not_regex:{message:"The :attribute must not match the required pattern.",rule:function(e,t){return!r.helpers.testRegex(e,"string"==typeof t[0]||t[0]instanceof String?new RegExp(t[0]):t[0])}},numeric:{message:"The :attribute must be a number.",rule:function(e){return r.helpers.numeric(e)}},phone:{message:"The :attribute must be a valid phone number.",rule:function(e){return r.helpers.testRegex(e,/^(\+?\d{0,4})?\s?-?\s?(\(?\d{3}\)?)\s?-?\s?(\(?\d{3}\)?)\s?-?\s?(\(?\d{4}\)?)?$/)}},regex:{message:"The :attribute must match the required pattern.",rule:function(e,t){return r.helpers.testRegex(e,"string"==typeof t[0]||t[0]instanceof String?new RegExp(t[0]):t[0])}},required:{message:"The :attribute field is required.",rule:function(e){return!r.helpers.isBlank(e)},required:!0},size:{message:"The :attribute must be :size:type.",rule:function(e,t){return r.helpers.size(e,t[1])==parseFloat(t[0])},messageReplace:function(e,t){return e.replace(":size",t[0]).replace(":type",r.helpers.sizeText(t[1]))}},string:{message:"The :attribute must be a string.",rule:function(e){return a(e)===a("string")}},typeof:{message:"The :attribute is not the correct type of :type.",rule:function(e,t){return a(e)===a(t[0])},messageReplace:function(e,t){return e.replace(":type",a(t[0]))}},url:{message:"The :attribute must be a url.",rule:function(e){return r.helpers.testRegex(e,/^(https?|ftp):\/\/(-\.)?([^\s/?\.#-]+\.?)+(\/[^\s]*)?$/i)}}},e.validators||{}),s.locales.hasOwnProperty(e.locale)||console.warn("Locale not found! Make sure it is spelled correctly and the locale file is loaded.");var t=s.locales[e.locale]||{};Object.keys(this.rules).forEach(function(e){r.rules[e].message=t[e]||r.rules[e].message}),this.messages=e.messages||{},this.className=e.className,this.autoForceUpdate=e.autoForceUpdate||!1,!1===e.element?this.element=function(e){return e}:e.hasOwnProperty("element")?this.element=e.element:"object"===("undefined"==typeof navigator?"undefined":a(navigator))&&"ReactNative"===navigator.product?this.element=function(e){return e}:this.element=function(e,t){return n.createElement("div",{className:t||r.className||"srv-validation-message"},e)}}return e(s,null,[{key:"addLocale",value:function(e,t){this.locales[e]=t}}]),e(s,[{key:"getErrorMessages",value:function(){return this.errorMessages}},{key:"showMessages",value:function(){this.messagesShown=!0,this.helpers.forceUpdateIfNeeded()}},{key:"hideMessages",value:function(){this.messagesShown=!1,this.helpers.forceUpdateIfNeeded()}},{key:"allValid",value:function(){for(var e in this.fields)if(!1===this.fieldValid(e))return!1;return!0}},{key:"fieldValid",value:function(e){return this.fields.hasOwnProperty(e)&&!0===this.fields[e]}},{key:"purgeFields",value:function(){this.fields={},this.errorMessages={}}},{key:"messageWhenPresent",value:function(e){var t=1<arguments.length&&void 0!==arguments[1]?arguments[1]:{};if(!this.helpers.isBlank(e)&&this.messagesShown)return this.helpers.element(e,t)}},{key:"messageAlways",value:function(e,t){var r=2<arguments.length&&void 0!==arguments[2]?arguments[2]:{};if(console.warn("The messageAlways() method is deprecated in SimpleReactValidator. Please see the documentation and switch to the messageWhenPresent() method."),t&&this.messagesShown)return this.helpers.element(t,r)}},{key:"message",value:function(e,t,r){var s=3<arguments.length&&void 0!==arguments[3]?arguments[3]:{};this.errorMessages[e]=null,this.fields[e]=!0,Array.isArray(r)||(r=r.split("|"));var n=s.validators?b({},this.rules,s.validators):this.rules,a=!0,i=!1,u=void 0;try{for(var l,o=r[Symbol.iterator]();!(a=(l=o.next()).done);a=!0){var c=l.value,m=g(this.helpers.normalizeValues(t,c),3),h=m[0],f=m[1],p=m[2];if(!this.helpers.passes(f,h,p,n)){this.fields[e]=!1;var d=this.helpers.message(f,e,s,n);if(0<p.length&&n[f].hasOwnProperty("messageReplace")&&(d=n[f].messageReplace(d,p)),this.errorMessages[e]=d,this.messagesShown||this.visibleFields.includes(e))return this.helpers.element(d,s)}}}catch(e){i=!0,u=e}finally{try{a||null==o.return||o.return()}finally{if(i)throw u}}}}]),s}();return i(t,"version","1.2.0"),i(t,"locales",{en:{}}),t});
\ No newline at end of file
+!function(e,t){"function"==typeof define&&define.amd?define(["react"],t):"object"==typeof exports?module.exports=t(require("react")):e.SimpleReactValidator=t(e.React)}(this,function(n){"use strict";function p(e,t){return function(e){if(Array.isArray(e))return e}(e)||function(e,t){var r=[],s=!0,n=!1,a=void 0;try{for(var i,u=e[Symbol.iterator]();!(s=(i=u.next()).done)&&(r.push(i.value),!t||r.length!==t);s=!0);}catch(e){n=!0,a=e}finally{try{s||null==u.return||u.return()}finally{if(n)throw a}}return r}(e,t)||function(){throw new TypeError("Invalid attempt to destructure non-iterable instance")}()}function a(e){return(a="function"==typeof Symbol&&"symbol"==typeof Symbol.iterator?function(e){return typeof e}:function(e){return e&&"function"==typeof Symbol&&e.constructor===Symbol&&e!==Symbol.prototype?"symbol":typeof e})(e)}function g(t){for(var e=1;e<arguments.length;e++){var r=null!=arguments[e]?arguments[e]:{},s=Object.keys(r);"function"==typeof Object.getOwnPropertySymbols&&(s=s.concat(Object.getOwnPropertySymbols(r).filter(function(e){return Object.getOwnPropertyDescriptor(r,e).enumerable}))),s.forEach(function(e){i(t,e,r[e])})}return t}function s(e,t){for(var r=0;r<t.length;r++){var s=t[r];s.enumerable=s.enumerable||!1,s.configurable=!0,"value"in s&&(s.writable=!0),Object.defineProperty(e,s.key,s)}}function e(e,t,r){return t&&s(e.prototype,t),r&&s(e,r),e}function i(e,t,r){return t in e?Object.defineProperty(e,t,{value:r,enumerable:!0,configurable:!0,writable:!0}):e[t]=r,e}var t=function(){function s(){var r=this,e=0<arguments.length&&void 0!==arguments[0]?arguments[0]:{};!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,s),i(this,"showMessageFor",function(e){r.visibleFields.push(e),r.helpers.forceUpdateIfNeeded()}),i(this,"hideMessageFor",function(e){var t=r.visibleFields.indexOf(e);-1<t&&r.visibleFields.splice(t,1),r.helpers.forceUpdateIfNeeded()}),i(this,"helpers",{parent:this,passes:function(e,t,r,s){return s.hasOwnProperty(e)?!(this.isRequired(e,s)||!this.isBlank(t))||!1!==s[e].rule(t,r,this.parent):(console.error("Rule Not Found: There is no rule with the name ".concat(e,".")),!0)},isRequired:function(e,t){return t[e].hasOwnProperty("required")&&t[e].required},isBlank:function(e){return null==e||""===e},isAsync:function(e,t){return t[e].hasOwnProperty("asyncRule")},normalizeValues:function(e,t){return[this.valueOrEmptyString(e),this.getValidation(t),this.getOptions(t)]},getValidation:function(e){return e===Object(e)&&Object.keys(e).length?Object.keys(e)[0]:e.split(":")[0]},getOptions:function(e){if(e===Object(e)&&Object.values(e).length){var t=Object.values(e)[0];return Array.isArray(t)?t:[t]}return 1<(t=e.split(":")).length?t[1].split(","):[]},valueOrEmptyString:function(e){return null==e?"":e},toSentence:function(e){return e.slice(0,-2).join(", ")+(e.slice(0,-2).length?", ":"")+e.slice(-2).join(2<e.length?", or ":" or ")},testRegex:function(e,t){return null!==e.toString().match(t)},forceUpdateIfNeeded:function(){this.parent.autoForceUpdate&&this.parent.autoForceUpdate.forceUpdate()},message:function(e,t,r,s){r.messages=r.messages||{};var n=r.messages[e]||r.messages.default||this.parent.messages[e]||this.parent.messages.default||s[e].message;return n.replace(":attribute",this.humanizeFieldName(t))},humanizeFieldName:function(e){return e.replace(/([A-Z])/g," $1").replace(/_/g," ").toLowerCase()},element:function(e,t){var r=t.element||this.parent.element;return r(e,t.className)},numeric:function(e){return this.testRegex(e,/^(\d+.?\d*)?$/)},momentInstalled:function(){return!(!window||!window.moment)||(console.warn("Date validators require using momentjs https://momentjs.com and moment objects."),!1)},size:function(e,t){return"string"===t||void 0===t||"array"===t?e.length:"num"===t?parseFloat(e):void 0},sizeText:function(e){return"string"===e||void 0===e?" characters":"array"===e?" elements":""}}),this.fields={},this.visibleFields=[],this.errorMessages={},this.asyncValidators={},this.messagesShown=!1,this.rules=g({accepted:{message:"The :attribute must be accepted.",rule:function(e){return!0===e},required:!0},after:{message:"The :attribute must be after :date.",rule:function(e,t){return r.helpers.momentInstalled()&&moment.isMoment(e)&&e.isAfter(t[0],"day")},messageReplace:function(e,t){return e.replace(":date",t[0].format("MM/DD/YYYY"))}},after_or_equal:{message:"The :attribute must be after or on :date.",rule:function(e,t){return r.helpers.momentInstalled()&&moment.isMoment(e)&&e.isSameOrAfter(t[0],"day")},messageReplace:function(e,t){return e.replace(":date",t[0].format("MM/DD/YYYY"))}},alpha:{message:"The :attribute may only contain letters.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z]*$/i)}},alpha_space:{message:"The :attribute may only contain letters and spaces.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z\s]*$/i)}},alpha_num:{message:"The :attribute may only contain letters and numbers.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z0-9]*$/i)}},alpha_num_space:{message:"The :attribute may only contain letters, numbers, and spaces.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z0-9\s]*$/i)}},alpha_num_dash:{message:"The :attribute may only contain letters, numbers, and dashes.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z0-9_-]*$/i)}},alpha_num_dash_space:{message:"The :attribute may only contain letters, numbers, dashes, and spaces.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z0-9_-\s]*$/i)}},array:{message:"The :attribute must be an array.",rule:function(e){return Array.isArray(e)}},before:{message:"The :attribute must be before :date.",rule:function(e,t){return r.helpers.momentInstalled()&&moment.isMoment(e)&&e.isBefore(t[0],"day")},messageReplace:function(e,t){return e.replace(":date",t[0].format("MM/DD/YYYY"))}},before_or_equal:{message:"The :attribute must be before or on :date.",rule:function(e,t){return r.helpers.momentInstalled()&&moment.isMoment(e)&&e.isSameOrBefore(t[0],"day")},messageReplace:function(e,t){return e.replace(":date",t[0].format("MM/DD/YYYY"))}},between:{message:"The :attribute must be between :min and :max:type.",rule:function(e,t){return r.helpers.size(e,t[2])>=parseFloat(t[0])&&r.helpers.size(e,t[2])<=parseFloat(t[1])},messageReplace:function(e,t){return e.replace(":min",t[0]).replace(":max",t[1]).replace(":type",r.helpers.sizeText(t[2]))}},boolean:{message:"The :attribute must be a boolean.",rule:function(e){return!1===e||!0===e}},card_exp:{message:"The :attribute must be a valid expiration date.",rule:function(e){return r.helpers.testRegex(e,/^(([0]?[1-9]{1})|([1]{1}[0-2]{1}))\s?\/\s?(\d{2}|\d{4})$/)}},card_num:{message:"The :attribute must be a valid credit card number.",rule:function(e){return r.helpers.testRegex(e,/^\d{4}\s?\d{4,6}\s?\d{4,5}\s?\d{0,8}$/)}},currency:{message:"The :attribute must be a valid currency.",rule:function(e){return r.helpers.testRegex(e,/^\$?(\d{1,3})(\,?\d{3})*\.?\d{0,2}$/)}},date:{message:"The :attribute must be a date.",rule:function(e){return r.helpers.momentInstalled()&&moment.isMoment(e)}},date_equals:{message:"The :attribute must be on :date.",rule:function(e,t){return r.helpers.momentInstalled()&&moment.isMoment(e)&&e.isSame(t[0],"day")},messageReplace:function(e,t){return e.replace(":date",t[0].format("MM/DD/YYYY"))}},email:{message:"The :attribute must be a valid email address.",rule:function(e){return r.helpers.testRegex(e,/^[A-Z0-9.!#$%&'*+-/=?^_`{|}~]+@[A-Z0-9.-]+\.[A-Z]{2,}$/i)}},in:{message:"The selected :attribute must be :values.",rule:function(e,t){return-1<t.indexOf(e)},messageReplace:function(e,t){return e.replace(":values",r.helpers.toSentence(t))}},integer:{message:"The :attribute must be an integer.",rule:function(e){return r.helpers.testRegex(e,/^\d*$/)}},max:{message:"The :attribute may not be greater than :max:type.",rule:function(e,t){return r.helpers.size(e,t[1])<=parseFloat(t[0])},messageReplace:function(e,t){return e.replace(":max",t[0]).replace(":type",r.helpers.sizeText(t[1]))}},min:{message:"The :attribute must be at least :min:type.",rule:function(e,t){return r.helpers.size(e,t[1])>=parseFloat(t[0])},messageReplace:function(e,t){return e.replace(":min",t[0]).replace(":type",r.helpers.sizeText(t[1]))}},not_in:{message:"The selected :attribute must not be :values.",rule:function(e,t){return-1===t.indexOf(e)},messageReplace:function(e,t){return e.replace(":values",r.helpers.toSentence(t))}},not_regex:{message:"The :attribute must not match the required pattern.",rule:function(e,t){return!r.helpers.testRegex(e,"string"==typeof t[0]||t[0]instanceof String?new RegExp(t[0]):t[0])}},numeric:{message:"The :attribute must be a number.",rule:function(e){return r.helpers.numeric(e)}},phone:{message:"The :attribute must be a valid phone number.",rule:function(e){return r.helpers.testRegex(e,/^(\+?\d{0,4})?\s?-?\s?(\(?\d{3}\)?)\s?-?\s?(\(?\d{3}\)?)\s?-?\s?(\(?\d{4}\)?)?$/)}},regex:{message:"The :attribute must match the required pattern.",rule:function(e,t){return r.helpers.testRegex(e,"string"==typeof t[0]||t[0]instanceof String?new RegExp(t[0]):t[0])}},required:{message:"The :attribute field is required.",rule:function(e){return!r.helpers.isBlank(e)},required:!0},size:{message:"The :attribute must be :size:type.",rule:function(e,t){return r.helpers.size(e,t[1])==parseFloat(t[0])},messageReplace:function(e,t){return e.replace(":size",t[0]).replace(":type",r.helpers.sizeText(t[1]))}},string:{message:"The :attribute must be a string.",rule:function(e){return a(e)===a("string")}},typeof:{message:"The :attribute is not the correct type of :type.",rule:function(e,t){return a(e)===a(t[0])},messageReplace:function(e,t){return e.replace(":type",a(t[0]))}},url:{message:"The :attribute must be a url.",rule:function(e){return r.helpers.testRegex(e,/^(https?|ftp):\/\/(-\.)?([^\s/?\.#-]+\.?)+(\/[^\s]*)?$/i)}}},e.validators||{}),s.locales.hasOwnProperty(e.locale)||console.warn("Locale not found! Make sure it is spelled correctly and the locale file is loaded.");var t=s.locales[e.locale]||{};Object.keys(this.rules).forEach(function(e){r.rules[e].message=t[e]||r.rules[e].message}),this.messages=e.messages||{},this.className=e.className,this.autoForceUpdate=e.autoForceUpdate||!1,!1===e.element?this.element=function(e){return e}:e.hasOwnProperty("element")?this.element=e.element:"object"===("undefined"==typeof navigator?"undefined":a(navigator))&&"ReactNative"===navigator.product?this.element=function(e){return e}:this.element=function(e,t){return n.createElement("div",{className:t||r.className||"srv-validation-message"},e)}}return e(s,null,[{key:"addLocale",value:function(e,t){this.locales[e]=t}}]),e(s,[{key:"getErrorMessages",value:function(){return this.errorMessages}},{key:"showMessages",value:function(){this.messagesShown=!0,this.helpers.forceUpdateIfNeeded()}},{key:"hideMessages",value:function(){this.messagesShown=!1,this.helpers.forceUpdateIfNeeded()}},{key:"allValid",value:function(){for(var e in this.fields)if(!1===this.fieldValid(e))return!1;return!0}},{key:"asyncValid",value:function(e){if(this.failedAsyncValidator=null,!this.allValid())return e.fail();if(0===Object.keys(this.asyncValidators).length)return e.pass();this.currentAsyncValidator=Object.keys(this.asyncValidators)[0];var t=this.asyncValidators[this.currentAsyncValidator];t.rules[t.rule].asyncRule(t.value,t.params,this,e)}},{key:"pass",value:function(e){var t=Object.keys(this.asyncValidators),r=t.indexOf(this.currentAsyncValidator);if(r>=t.length-1)return e.pass();this.currentAsyncValidator=t[r+1];var s=this.asyncValidators[this.currentAsyncValidator];s.rules[s.rule].asyncRule(s.value,s.params,this,e)}},{key:"fail",value:function(e){this.asyncValidators[this.currentAsyncValidator];this.failedAsyncValidator=this.currentAsyncValidator,e.fail()}},{key:"fieldValid",value:function(e){return this.fields.hasOwnProperty(e)&&!0===this.fields[e]}},{key:"purgeFields",value:function(){this.fields={},this.errorMessages={}}},{key:"messageWhenPresent",value:function(e){var t=1<arguments.length&&void 0!==arguments[1]?arguments[1]:{};if(!this.helpers.isBlank(e)&&this.messagesShown)return this.helpers.element(e,t)}},{key:"messageAlways",value:function(e,t){var r=2<arguments.length&&void 0!==arguments[2]?arguments[2]:{};if(console.warn("The messageAlways() method is deprecated in SimpleReactValidator. Please see the documentation and switch to the messageWhenPresent() method."),t&&this.messagesShown)return this.helpers.element(t,r)}},{key:"message",value:function(e,t,r){var s=3<arguments.length&&void 0!==arguments[3]?arguments[3]:{};this.errorMessages[e]=null,this.fields[e]=!0,Array.isArray(r)||(r=r.split("|"));var n=s.validators?g({},this.rules,s.validators):this.rules,a=!0,i=!1,u=void 0;try{for(var l,o=r[Symbol.iterator]();!(a=(l=o.next()).done);a=!0){var c=l.value,h=p(this.helpers.normalizeValues(t,c),3),m=h[0],f=h[1],d=h[2];if(this.helpers.isAsync(f,n)&&(this.asyncValidators["".concat(e,":").concat(f)]={value:m,rule:f,params:d,field:e,options:s,rules:n}),!this.helpers.passes(f,m,d,n)||this.helpers.isAsync(f,n)&&this.failedAsyncValidator=="".concat(e,":").concat(f))return this.fieldFailure(e,f,n,s,d)}}catch(e){i=!0,u=e}finally{try{a||null==o.return||o.return()}finally{if(i)throw u}}}},{key:"fieldFailure",value:function(e,t,r,s,n){this.fields[e]=!1;var a=this.helpers.message(t,e,s,r);if(0<n.length&&r[t].hasOwnProperty("messageReplace")&&(a=r[t].messageReplace(a,n)),this.errorMessages[e]=a,this.messagesShown)return this.helpers.element(a,s)}}]),s}();return i(t,"version","1.2.0"),i(t,"locales",{en:{}}),t});
\ No newline at end of file
diff --git a/docs/dev-index.html b/docs/dev-index.html
index 082bc24..ebb0a52 100644
--- a/docs/dev-index.html
+++ b/docs/dev-index.html
@@ -11,6 +11,7 @@
     <script type="text/javascript" src="../dist/simple-react-validator.js"></script>
     <script type="text/javascript" src="../dist/locale/fr.js"></script>
     <script src="example.jsx" type="text/babel"></script>
+    <script src="example-async.jsx" type="text/babel"></script>
 
     <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
     <style>
@@ -25,5 +26,6 @@
         open terminal, run <code>npm run serve</code> in the project directory, and navigate to <a href="http://localhost:3000/docs">localhost:3000/docs/dev-index.html</a>
       </div>
     </div>
+    <div id="exampleAsyncForm"></div>
   </body>
 </html>
diff --git a/docs/example-async.jsx b/docs/example-async.jsx
new file mode 100644
index 0000000..c719662
--- /dev/null
+++ b/docs/example-async.jsx
@@ -0,0 +1,68 @@
+class ExampleAsyncForm extends React.Component {
+
+  constructor(props) {
+    super(props);
+    this.state = {
+      processing: false
+    };
+    this.validator = new SimpleReactValidator({
+      className: 'text-danger',
+      validators: {
+        unique: {
+          message: 'Not a unique email.',
+          asyncRule: function(val, params, validator, completion) {
+            setTimeout(() => validator.fail(completion), 1000);
+          }
+        }
+      }
+    });
+  }
+
+  submitForm() {
+    this.setState({processing: true});
+    this.validator.asyncValid({
+      pass: () => {
+        alert('You submitted the form and stuff!');
+        this.setState({processing: false});
+      },
+      fail: () => {
+        console.log(this.validator);
+        this.validator.showMessages();
+        this.setState({processing: false});
+      }
+    });
+  }
+
+  handleInputChange(event) {
+    const target = event.target;
+    const value = target.type === 'checkbox' ? target.checked : target.value;
+    const name = target.name;
+    this.setState({
+      [name]: value
+    });
+  }
+
+  render() {
+    return (
+      <div className="container card my-4">
+        <div className="card-body">
+          <h3>Example Async Form</h3>
+          <small className="text-muted">Click submit to view messages.</small>
+          <hr />
+          <div className="row">
+            <div className="col-sm-6 col-md-4">
+              <div className="form-group">
+                <label>Email</label>
+                <input className="form-control" type="email" name="email" value={this.state.email} onChange={this.handleInputChange.bind(this)} />
+                {this.validator.message('email', this.state.email, 'email|unique')}
+              </div>
+            </div>
+          </div>
+          <button className="btn btn-primary" onClick={this.submitForm.bind(this)} disabled={this.state.processing}>Submit</button>
+        </div>
+      </div>
+    );
+  }
+}
+
+ReactDOM.render(<ExampleAsyncForm />, document.getElementById('exampleAsyncForm'));
diff --git a/src/simple-react-validator.js b/src/simple-react-validator.js
index 93d048b..e9613f9 100644
--- a/src/simple-react-validator.js
+++ b/src/simple-react-validator.js
@@ -10,6 +10,7 @@ class SimpleReactValidator {
     this.fields = {};
     this.visibleFields = [];
     this.errorMessages = {};
+    this.asyncValidators = {};
     this.messagesShown = false;
     this.rules = {
       accepted             : {message: 'The :attribute must be accepted.',                                      rule: val => val === true, required: true},
@@ -111,6 +112,34 @@ class SimpleReactValidator {
     return true;
   }
 
+  asyncValid(completion) {
+    this.failedAsyncValidator = null;
+    if (!this.allValid()) return completion.fail();
+    if (Object.keys(this.asyncValidators).length === 0 ) return completion.pass();
+
+    this.currentAsyncValidator = Object.keys(this.asyncValidators)[0];
+    const validator = this.asyncValidators[this.currentAsyncValidator];
+    validator.rules[validator.rule].asyncRule(validator.value, validator.params, this, completion);
+  }
+
+  pass(completion) {
+    const keys = Object.keys(this.asyncValidators);
+    const index = keys.indexOf(this.currentAsyncValidator);
+    if (index >= keys.length - 1) {
+      return completion.pass();
+    } else {
+      this.currentAsyncValidator = keys[index+1];
+      const validator = this.asyncValidators[this.currentAsyncValidator];
+      validator.rules[validator.rule].asyncRule(validator.value, validator.params, this, completion);
+    }
+  }
+
+  fail(completion) {
+    const validator = this.asyncValidators[this.currentAsyncValidator];
+    this.failedAsyncValidator = this.currentAsyncValidator;
+    completion.fail();
+  }
+
   fieldValid(field) {
     return this.fields.hasOwnProperty(field) && this.fields[field] === true;
   }
@@ -142,22 +171,36 @@ class SimpleReactValidator {
     var rules = options.validators ? {...this.rules, ...options.validators} : this.rules;
     for (let validation of validations) {
       let [value, rule, params] = this.helpers.normalizeValues(inputValue, validation);
-      if (!this.helpers.passes(rule, value, params, rules)) {
-        this.fields[field] = false;
-        let message = this.helpers.message(rule, field, options, rules);
-
-        if (params.length > 0 && rules[rule].hasOwnProperty('messageReplace')) {
-          message = rules[rule].messageReplace(message, params);
-        }
-
-        this.errorMessages[field] = message;
-        if (this.messagesShown || this.visibleFields.includes(field)) {
-          return this.helpers.element(message, options);
-        }
+      if (this.helpers.isAsync(rule, rules)) {
+        this.asyncValidators[`${field}:${rule}`] = {
+          value: value,
+          rule: rule,
+          params: params,
+          field: field,
+          options: options,
+          rules: rules
+        };
+      }
+      if (!this.helpers.passes(rule, value, params, rules) || (this.helpers.isAsync(rule, rules) && this.failedAsyncValidator == `${field}:${rule}`)) {
+        return this.fieldFailure(field, rule, rules, options, params);
       }
     }
   }
 
+  fieldFailure(field, rule, rules, options, params) {
+    this.fields[field] = false;
+    let message = this.helpers.message(rule, field, options, rules);
+
+    if (params.length > 0 && rules[rule].hasOwnProperty('messageReplace')) {
+      message = rules[rule].messageReplace(message, params);
+    }
+
+    this.errorMessages[field] = message;
+    if (this.messagesShown) {
+      return this.helpers.element(message, options);
+    }
+  }
+
   helpers = {
     parent: this,
 
@@ -180,6 +223,10 @@ class SimpleReactValidator {
       return typeof(value) === 'undefined' || value === null || value === '';
     },
 
+    isAsync(rule, rules) {
+      return rules[rule].hasOwnProperty('asyncRule');
+    },
+
     normalizeValues(value, validation) {
       return [this.valueOrEmptyString(value), this.getValidation(validation), this.getOptions(validation)];
     },