diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..2571f61
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,25 @@
+module github.com/fishjam/esm
+
+go 1.21.1
+
+require (
+	github.com/cheggaaa/pb v1.0.29
+	github.com/cihub/seelog v0.0.0-20170130134532-f561c5e57575
+	github.com/jessevdk/go-flags v1.5.0
+	github.com/mattn/go-isatty v0.0.14
+	github.com/parnurzeal/gorequest v0.2.16
+	github.com/valyala/fasthttp v1.51.0
+)
+
+require (
+	github.com/andybalholm/brotli v1.0.5 // indirect
+	github.com/elazarl/goproxy v0.0.0-20231117061959-7cc037d33fb5 // indirect
+	github.com/klauspost/compress v1.17.0 // indirect
+	github.com/mattn/go-runewidth v0.0.4 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/smartystreets/goconvey v1.8.1 // indirect
+	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	golang.org/x/net v0.17.0 // indirect
+	golang.org/x/sys v0.13.0 // indirect
+	moul.io/http2curl v1.0.0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..08b0ceb
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,50 @@
+github.com/andybalholm/brotli v1.0.5 h1:8uQZIdzKmjc/iuPu7O2ioW48L81FgatrcpfFmiq/cCs=
+github.com/andybalholm/brotli v1.0.5/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
+github.com/cheggaaa/pb v1.0.29 h1:FckUN5ngEk2LpvuG0fw1GEFx6LtyY2pWI/Z2QgCnEYo=
+github.com/cheggaaa/pb v1.0.29/go.mod h1:W40334L7FMC5JKWldsTWbdGjLo0RxUKK73K+TuPxX30=
+github.com/cihub/seelog v0.0.0-20170130134532-f561c5e57575 h1:kHaBemcxl8o/pQ5VM1c8PVE1PubbNx3mjUr09OqWGCs=
+github.com/cihub/seelog v0.0.0-20170130134532-f561c5e57575/go.mod h1:9d6lWj8KzO/fd/NrVaLscBKmPigpZpn5YawRPw+e3Yo=
+github.com/elazarl/goproxy v0.0.0-20231117061959-7cc037d33fb5 h1:m62nsMU279qRD9PQSWD1l66kmkXzuYcnVJqL4XLeV2M=
+github.com/elazarl/goproxy v0.0.0-20231117061959-7cc037d33fb5/go.mod h1:Ro8st/ElPeALwNFlcTpWmkr6IoMFfkjXAvTHpevnDsM=
+github.com/elazarl/goproxy/ext v0.0.0-20190711103511-473e67f1d7d2/go.mod h1:gNh8nYJoAm43RfaxurUnxr+N1PwuFV3ZMl/efxlIlY8=
+github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
+github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
+github.com/gopherjs/gopherjs v1.17.2 h1:fQnZVsXk8uxXIStYb0N4bGk7jeyTalG/wsZjQ25dO0g=
+github.com/gopherjs/gopherjs v1.17.2/go.mod h1:pRRIvn/QzFLrKfvEz3qUuEhtE/zLCWfreZ6J5gM2i+k=
+github.com/jessevdk/go-flags v1.5.0 h1:1jKYvbxEjfUl0fmqTCOfonvskHHXMjBySTLW4y9LFvc=
+github.com/jessevdk/go-flags v1.5.0/go.mod h1:Fw0T6WPc1dYxT4mKEZRfG5kJhaTDP9pj1c2EWnYs/m4=
+github.com/jtolds/gls v4.20.0+incompatible h1:xdiiI2gbIgH/gLH7ADydsJ1uDOEzR8yvV7C0MuV77Wo=
+github.com/jtolds/gls v4.20.0+incompatible/go.mod h1:QJZ7F/aHp+rZTRtaJ1ow/lLfFfVYBRgL+9YlvaHOwJU=
+github.com/klauspost/compress v1.17.0 h1:Rnbp4K9EjcDuVuHtd0dgA4qNuv9yKDYKK1ulpJwgrqM=
+github.com/klauspost/compress v1.17.0/go.mod h1:ntbaceVETuRiXiv4DpjP66DpAtAGkEQskQzEyD//IeE=
+github.com/mattn/go-colorable v0.1.4 h1:snbPLB8fVfU9iwbbo30TPtbLRzwWu6aJS6Xh4eaaviA=
+github.com/mattn/go-colorable v0.1.4/go.mod h1:U0ppj6V5qS13XJ6of8GYAs25YV2eR4EVcfRqFIhoBtE=
+github.com/mattn/go-isatty v0.0.8/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
+github.com/mattn/go-isatty v0.0.11/go.mod h1:PhnuNfih5lzO57/f3n+odYbM4JtupLOxQOAqxQCu2WE=
+github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
+github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
+github.com/mattn/go-runewidth v0.0.4 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y=
+github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
+github.com/parnurzeal/gorequest v0.2.16 h1:T/5x+/4BT+nj+3eSknXmCTnEVGSzFzPGdpqmUVVZXHQ=
+github.com/parnurzeal/gorequest v0.2.16/go.mod h1:3Kh2QUMJoqw3icWAecsyzkpY7UzRfDhbRdTjtNwNiUE=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/rogpeppe/go-charset v0.0.0-20180617210344-2471d30d28b4/go.mod h1:qgYeAmZ5ZIpBWTGllZSQnw97Dj+woV0toclVaRGI8pc=
+github.com/smarty/assertions v1.15.0 h1:cR//PqUBUiQRakZWqBiFFQ9wb8emQGDb0HeGdqGByCY=
+github.com/smarty/assertions v1.15.0/go.mod h1:yABtdzeQs6l1brC900WlRNwj6ZR55d7B+E8C6HtKdec=
+github.com/smartystreets/goconvey v1.8.1 h1:qGjIddxOk4grTu9JPOU31tVfq3cNdBlNa5sSznIX1xY=
+github.com/smartystreets/goconvey v1.8.1/go.mod h1:+/u4qLyY6x1jReYOp7GOM2FSt8aP9CzCZL03bI28W60=
+github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
+github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
+github.com/valyala/fasthttp v1.51.0 h1:8b30A5JlZ6C7AS81RsWjYMQmrZG6feChmgAolCl1SqA=
+github.com/valyala/fasthttp v1.51.0/go.mod h1:oI2XroL+lI7vdXyYoQk03bXBThfFl2cVdIA3Xl7cH8g=
+golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
+golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
+golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+moul.io/http2curl v1.0.0 h1:6XwpyZOYsgZJrU8exnG87ncVkU1FVCcTRpwzOkTDUi8=
+moul.io/http2curl v1.0.0/go.mod h1:f6cULg+e4Md/oW1cYmwW4IWQOVl2lGbmCNGOHvzX2kE=
diff --git a/http.go b/http.go
index be17470..406474b 100644
--- a/http.go
+++ b/http.go
@@ -25,10 +25,8 @@ import (
 	"fmt"
 	log "github.com/cihub/seelog"
 	"github.com/parnurzeal/gorequest"
-	"infini.sh/framework/core/util"
-	"infini.sh/framework/lib/fasthttp"
+        "github.com/valyala/fasthttp"
 	"io"
-	"io/ioutil"
 	"net/http"
 	"net/url"
 	"strings"
@@ -208,7 +206,8 @@ func DoRequest(compress bool,method string,loadUrl string,auth *Auth,body []byte
 		panic("empty response")
 	}
 
-	log.Debug("received status code", resp.StatusCode, "from", string(resp.Header.Header()), "content", util.SubString(string(resp.Body()),0,500), req)
+	log.Debug("received status code", resp.StatusCode, "from", string(resp.Header.Header()), "content",
+		SubString(string(resp.Body()), 0, 500), req)
 
 	if resp.StatusCode() == http.StatusOK || resp.StatusCode() == http.StatusCreated {
 
@@ -281,7 +280,7 @@ func Request(method string,r string,auth *Auth,body *bytes.Buffer,proxy string)(
 
 	resp,errs := client.Do(reqest)
 	if errs != nil {
-		log.Error(util.SubString(errs.Error(),0,500))
+		log.Error(SubString(errs.Error(), 0, 500))
 		return "",errs
 	}
 
@@ -291,23 +290,23 @@ func Request(method string,r string,auth *Auth,body *bytes.Buffer,proxy string)(
 	}
 
 	if resp.StatusCode != 200 {
-		b, _ := ioutil.ReadAll(resp.Body)
+		b, _ := io.ReadAll(resp.Body)
 		return "",errors.New("server error: "+string(b))
 	}
 
-	respBody,err:=ioutil.ReadAll(resp.Body)
+	respBody, err := io.ReadAll(resp.Body)
 
-	log.Error(util.SubString(string(respBody),0,500))
+	log.Error(SubString(string(respBody), 0, 500))
 
 	if err != nil {
-		log.Error(util.SubString(string(err.Error()),0,500))
+		log.Error(SubString(string(err.Error()), 0, 500))
 		return string(respBody),err
 	}
 
 	if err != nil {
 		return string(respBody),err
 	}
-	io.Copy(ioutil.Discard, resp.Body)
+	io.Copy(io.Discard, resp.Body)
 	defer resp.Body.Close()
 	return string(respBody),nil
 }
diff --git a/utils.go b/utils.go
new file mode 100644
index 0000000..2378817
--- /dev/null
+++ b/utils.go
@@ -0,0 +1,19 @@
+package main
+
+import "fmt"
+
+func SubString(prim string, start int, end int) string {
+    if len(prim) == 0 {
+        fmt.Println("primitive str is empty")
+    }
+    if l := len(prim); l < end {
+        end = l
+    }
+
+    value := prim
+    runes := []rune(value)
+
+    safeSubString := string(runes[start:end])
+
+    return safeSubString
+}
diff --git a/v6.go b/v6.go
index 085e26c..3f31e77 100644
--- a/v6.go
+++ b/v6.go
@@ -26,7 +26,7 @@ import (
 	"io/ioutil"
 	"strings"
 	"regexp"
-	"infini.sh/framework/core/util"
+	//"infini.sh/framework/core/util"
 )
 
 type ESAPIV6 struct {
@@ -199,7 +199,7 @@ func (s *ESAPIV6) UpdateIndexMapping(indexName string,settings map[string]interf
 		res, err := Request("POST", url, s.Auth, &body,s.HttpProxy)
 		if(err!=nil){
 			log.Error(url)
-			log.Error(util.ToJson(settings,false))
+			log.Error(settings)
 			log.Error(err,res)
 			panic(err)
 		}