Express-Util-Helper

Http Helper & Error Handler

Express Helper is a NPM where you can get

• Http Helper
• Error Handler

Features

const { httpHelper, errorHandler, authHelper } = require( 'express-util-helper' );

• HTTP Helper

  Response in Boolean
  e.g. Success : { success : "true", message : "Some Success Message" }
  e.g. Error : { success : "false", message : "Some Error Message" }
app.get( '/', ( req, res ) => { httpHelper( 'ack', res, error, message ); } )

  Response in Object
  e.g. Success : { "success": true, "data": { "name": "Sarada", "age": "22" } }
  e.g. Error : { "success": false, "data": { }, err : { "message" : "Some error message" } }
app.get( '/', ( req, res ) => { httpHelper( 'ack', res, error, object ); } )

  Response in Array
  e.g. Success : { "success": true, "data": [ 1, 2, 3, 4, 5, 6, 7, 8, 9 ] }
  e.g. Error : { "success": false, "data": [], err : { "message" : "Some error message" } }
app.get( '/', ( req, res ) => { httpHelper( 'ack', res, error, array ); } )

• Error Handler

  const { invalidRoute, universalErrorHandler } = errorHandler;

  After all routers app.use( invalidRoute ) app.use( universalErrorHandler )

• JWT Authentication Helper

  const { createToken, verifyToken } = authHelper;

  This authentication function is a middleware to filter authenticate users
const authentication = ( req, res, next ) => {
verifyToken( req.headers, 'secret' ) // "secret" - Secret key to encrypt and decrypt data
.then( data => {
req.authData = data;
next();
} )
.catch( err => {
httpHelper( 'ack', res, err, err.message );
} )
}
  

  Authentication Methods
# () Generate Authentication Token
app.get( '/generate/token', ( req, res ) => {
let token = createToken( { id : 101 }, "secret", 60 * 60 * 24 )

// { id : 101 } - This data will encrypted
// "secret" - Secret key to encrypt and decrypt data
// 60 * 60 * 24 = 24 hours = 24 * 3600 seconds
httpHelper( 'record', res, null, { jwtToken : token } )
} )
# () Validate Authentication Token In A Middleware
app.get( '/verify/token', authentication, ( req, res, next ) => {
let responseData = {
message : "User Authenticated",
authData : {
...req.authData
}
}
httpHelper( 'record', res, null, responseData );
} )

  #NB : Secret key must be same in both encrypt and decrypt case. Otherwise token will not be validated.