diff --git a/packages/core/src/engine.js b/packages/core/src/engine.js
index ed7b4296..fc2a0a2f 100644
--- a/packages/core/src/engine.js
+++ b/packages/core/src/engine.js
@@ -33,6 +33,15 @@ function createErrorWith(error, index, funcName, chunk) {
     const err = Error(msg);
     err.sourceError = error;
     err.sourceChunk = JSON.stringify(chunk);
+    err.toJSON = () => ({
+        type: error.type || 'Standard error',
+        scope: error.scope || 'code',
+        date: error.date || new Date(),
+        message: msg.split('\n').shift(),
+        func: funcName,
+        index,
+        chunk,
+    });
     Error.captureStackTrace(err, createErrorWith);
     debug('ezs')('Caught an', err);
     return err;
diff --git a/packages/core/src/feed.js b/packages/core/src/feed.js
index 578154fa..ed392596 100644
--- a/packages/core/src/feed.js
+++ b/packages/core/src/feed.js
@@ -16,6 +16,11 @@ export default class Feed {
         if (something === null) {
             this.seal();
         } else if (something !== undefined) {
+            if (something instanceof Error) {
+                something.type = 'Data corruption error';
+                something.scope = 'data';
+                something.date = new Date();
+            }
             this.push(something);
         }
     }
@@ -67,6 +72,9 @@ export default class Feed {
     }
 
     stop(withError) {
+        withError.type = 'Fatal run-time error';
+        withError.scope = 'statements';
+        withError.date = new Date();
         this.error(withError);
         this.seal();
     }
diff --git a/packages/core/src/index.js b/packages/core/src/index.js
index 60d0d1b5..9f166bda 100644
--- a/packages/core/src/index.js
+++ b/packages/core/src/index.js
@@ -113,25 +113,11 @@ ezs.createPipeline = (input, commands, trap) => {
     }
     return output
         .pipe(ezs.catch((e) => {
-            trap.write({
-                type: 'Run-time warning',
-                scope: 'data',
-                message: e.message.split('\n').shift(),
-                messageFull: e.message,
-                sourceError: e.sourceError,
-                sourceChunk: e.sourceChunk,
-            });
+            trap.write(e.toJSON()); // see engine.js createErrorWith
             return false; // do not catch the error
         }))
         .once('error', (e) => {
-            trap.write({
-                type: 'Fatal run-time error',
-                scope: 'statements',
-                message: e.message.split('\n').shift(),
-                messageFull: e.message,
-                sourceError: e.sourceError,
-                sourceChunk: e.sourceChunk,
-            });
+            trap.write(e.toJSON()); // see engine.js createErrorWith
             trap.end();
         })
         .once('end', () => {
diff --git a/packages/core/src/server/errorHandler.js b/packages/core/src/server/errorHandler.js
index 58653254..53c3f317 100644
--- a/packages/core/src/server/errorHandler.js
+++ b/packages/core/src/server/errorHandler.js
@@ -5,13 +5,15 @@ import { httpRequestErrorTotal }  from './metrics';
 const errorHandler = (request, response) => (error, code = 400) => {
     debug('ezs')('Server has caught an error', error);
     httpRequestErrorTotal.labels(request.pathName).inc();
-    if (!response.headersSent) {
-        response.setHeader('Content-Type', 'text/plain');
-        response.setHeader('Content-Disposition', 'inline');
-        response.writeHead(code, { 'X-Error': Parameter.encode(error.toString()) });
-        response.write(error.toString().split('\n', 1)[0]);
+    if (response.headersSent) {
+        return response.end();
     }
-    response.end();
+    const bodyResponse = JSON.stringify(error);
+    response.setHeader('Content-Type', 'application/json');
+    response.setHeader('Content-Length', bodyResponse.length);
+    response.setHeader('Content-Disposition', 'inline');
+    response.writeHead(code, { 'X-Error': Parameter.encode(error.toString()) });
+    return response.end(bodyResponse);
 };
 
 export default errorHandler;