Update readme

Author: zhiyi7

README.md

@@ -20,16 +20,16 @@ Send a 200 response with the data and meta object.
 
 Can be disabled by setting the `app.disableReplyHelperFunctions` to `true`.
 
-`res.ok({ok: 'It works!'}, {addition: 'someValue'})`
+`res.ok({baz: 'It works!'}, {foo: 'bar'})`
 
 ```json
 {
     "status": "ok",
     "data": {
-        "ok": "It works!"
+        "baz": "It works!"
     },
     "meta": {
-        "addition": "someValue"
+        "foo": "bar"
     }
 }
 ```
@@ -38,18 +38,25 @@ Can be disabled by setting the `app.disableReplyHelperFunctions` to `true`.
 
 Send an error object to the client with message and code. The HTTP status code will be set to statusCode(defaults to 200).
 
-Can be disabled by setting the `app.disableApiErrorHandler` to `true`.
-
-`throw new ApiError('User Not found', 'err_code_user_not_found', 404, {'error_field':'user'})` will return with http status code 404:
+```javascript
+import { ApiError } from 'fastify-app';
+// and in your route handler:
+// ...
+throw new ApiError('User Not found', 'err_code_user_not_found', 404, {'error_field':'user'})
+```
+will return with http status code 404:
 
 ```json
 {
     "status": "error",
     "message": "User Not found",
     "code": "err_code_user_not_found",
-    "error_field": "user"
+    "data": {
+        "error_field": "username"
+    }
 }
 ```
+This feature can be disabled by setting the `app.disableApiErrorHandler` to `true`.
 
 ## Health-checking endpoints
 
@@ -81,7 +88,7 @@ By default, the server will add the CORS headers to the response. This behavior
 
 ### Logging enabled
 
-By default, the server will log the request and response to console. This behavior can be disabled by setting the `fastify.disableRequestLogging` to `true`, or by setting the `fastify.logger`. All the settings under the `fastify` key will be passed to the `fastify` construct function.
+By default, the server will log the request and response to console. This behavior can be disabled by setting the `fastify.disableRequestLogging` to `true`. All the settings under the `fastify` key will be passed to the `fastify` construct function.
 
 ### Log request body and headers
 
@@ -95,23 +102,6 @@ By default, the server will log the request body and headers. These behaviors ca
 
 By default, the server will send a `Request-Id` header to the client. This behavior can be disabled by setting the `app.disableSendRequestIdHeader` to `true`.
 
-### ApiError handler and response
-
-By default, if `ApiError(message, code, statusCode, data)` is not caught by local error handler, the server will handle this ApiError and return the error object to the client, with HTTP status code `statusCode` which defaults to `200`.
-
-The response format is:
-
-```json
-{
-    "status": "error",
-    "message": "custom error messsage string or object",
-    "code": "custom error code",
-    "data": "additional data"
-}
-```
-
-This behavior can be disabled by setting the `app.disableApiErrorHandler` to `true`.
-
 ### Other errors handler and default error response
 
 By default, the server will handle the uncaught errors and return the error object to the client. The HTTP status code defaults to 200 which also can be changed by settting `app.InternalServerErrorCode`. If `process.env.NODE_ENV === 'development'`, the error detail will be sent to the client.