Responser NPM | npm.io

Responser

Simplify, standardize and format HTTP Status Code responses in JSON with express

No need to remember which is the code for each HTTP status anymore! Responser provides a simple way to return standardized responses for each available HTTP status. It overwrites the express interface, making all methods accessible through your response or res variable.

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Simple Usage

Install

Add responser with your favorite package manager:

  yarn add responser

Typescript

Express response without the use of responser:

import express, { Request, Response } from 'express'
const app = express()
const router = express.Router()
app.use(router)

router.get('/hello', (req: Request, res: Response) => {
  res.status(400).json({
    status: 'BAD_REQUEST',
    code: 400,
    message: 'Request is wrong!',
    success: false
  })
})

Now same code using responser:

import responser from 'responser'
import express, { Request, Response } from 'express'
const app = express()
const router = express.Router()
app.use(responser) // add responser middleware
app.use(router)

router.get('/hello', (req: Request, res: Response) => {
  res.send_badRequest('Request is wrong!')
})

As you can see from the example above, using responser makes code a bit cleaner and less error-prone.

Require (CommonJS) version:

const responser = require("responser").default
const express = require("express")
const app = express()
const router = express.Router()
app.use(responser) // add responser middleware
app.use(router)

router.get('/hello', (req, res) => {
  res.send_badRequest('Request is wrong!')
})

Input Parameters

All respose.send_* methods accept two parameters:

(message: string, content?: any) => void

parameter	description	type	required
message	Human-readable message	string	yes
content	Anything you would like to return	any	no

Output Properties

property	description	type	e.g.1	e.g.2
code	HTTP Status Code	number	200	400
status	HTTP Status Name	string	OK	BAD_REQUEST
success	Success Flag	boolean	true	false
data	content if success=true	any	{ items: [] }	-
errors	content if success=false	any	-	{ err: "err1 text"}

Details

For each responser method,

When code is < 300 (✅ successful):

Property success will be true
content given will be accessible as property data

When code is >= 300 (❌ unsuccessful):

Property success will be false
content given will be accessible as property errors

List of Methods (method, code and status):

send_continue                      100 // Continue
send_switchingProtocols            101 // Switching Protocols
send_processing                    102 // Processing
send_ok                            200 // OK
send_created                       201 // Created
send_accepted                      202 // Accepted
send_nonAuthoritativeInformation   203 // Non Authoritative Information
send_noContent                     204 // No Content
send_resetContent                  205 // Reset Content
send_partialContent                206 // Partial Content
send_multiStatus                   207 // Multi-Status
send_multipleChoices               300 // Multiple Choices
send_movedPermanently              301 // Moved Permanently
send_movedTemporarily              302 // Moved Temporarily
send_seeOther                      303 // See Other
send_notModified                   304 // Not Modified
send_useProxy                      305 // Use Proxy
send_temporaryRedirect             307 // Temporary Redirect
send_permanentRedirect             308 // Permanent Redirect
send_badRequest                    400 // Bad Request
send_unauthorized                  401 // Unauthorized
send_paymentRequired               402 // Payment Required
send_forbidden                     403 // Forbidden
send_notFound                      404 // Not Found
send_methodNotAllowed              405 // Method Not Allowed
send_notAcceptable                 406 // Not Acceptable
send_proxyAuthenticationRequired   407 // Proxy Authentication Required
send_requestTimeout                408 // Request Timeout
send_conflict                      409 // Conflict
send_gone                          410 // Gone
send_lengthRequired                411 // Length Required
send_preconditionFailed            412 // Precondition Failed
send_requestTooLong                413 // Request Entity Too Large
send_requestUriTooLong             414 // Request-URI Too Long
send_unsupportedMediaType          415 // Unsupported Media Type
send_requestedRangeNotSatisfiable  416 // Requested Range Not Satisfiable
send_expectationFailed             417 // Expectation Failed
send_imATeapot                     418 // I'm a teapot
send_insufficientSpaceOnResource   419 // Insufficient Space on Resource
send_methodFailure                 420 // Method Failure
send_unprocessableEntity           422 // Unprocessable Entity
send_locked                        423 // Locked
send_failedDependency              424 // Failed Dependency
send_preconditionRequired          428 // Precondition Required
send_tooManyRequests               429 // Too Many Requests
send_requestHeaderFieldsTooLarge   431 // Request Header Fields Too Large
send_unavailableForLegalReasons    451 // Unavailable For Legal Reasons
send_internalServerError           500 // Internal Server Error
send_notImplemented                501 // Not Implemented
send_badGateway                    502 // Bad Gateway
send_serviceUnavailable            503 // Service Unavailable
send_gatewayTimeout                504 // Gateway Timeout
send_httpVersionNotSupported       505 // HTTP Version Not Supported
send_insufficientStorage           507 // Insufficient Storage
send_networkAuthenticationRequired 511 // Network Authentication Required

Full example: Successful response

const express = require('express')
const responser = require('responser').default
const app = express()
const router = express.Router()
app.use(responser)
app.use(router)
router.get('/planets', (request, response, next) => {
  const planets = ['Mercury', 'Venus', 'Earth', 'Mars', 'Jupiter', 'Saturn', 'Uranus', 'Neptune']
  response.send_ok('Planets were found successfully', { 
    planets, 
    planetsCount: planets.length 
  })
})
app.listen(3000, () => console.log('Server running on port 3000'))

The route /planets generates the following response to a GET request:

HTTP/1.1 200 OK
X-Powered-By: Express
Content-Type: application/json; charset=utf-8

{
  "status": "OK",
  "code": 200,
  "success": true,
  "message": "Planets were found successfully",
  "data": {
    "planets": [
      "Mercury",
      "Venus",
      "Earth",
      "Mars",
      "Jupiter",
      "Saturn",
      "Uranus",
      "Neptune"
    ],
    "planetsCount": 8
  }
}

Full example: Unsuccessful response

const express = require('express')
const responser = require('responser').default
const app = express()
const router = express.Router()
app.use(responser)
app.use(router)
router.post('/planets', (request, response, next) => {
  const planetName = request.body?.name
  let myErrors = []
  if(!planetName) myErrors.push({ 
    name: 'planetName', 
    message: 'Planet name was not given!' 
  })
  if(myErrors.length) return response.send_badRequest(
    'The request contains one or more errors!', myErrors
  )
})
app.listen(3000, () => console.log('Server running on port 3000'))

Example response if planetName is not given on a POST request body.

HTTP/1.1 400 BAD REQUEST
X-Powered-By: Express
Content-Type: application/json; charset=utf-8

{
  "status": "BAD_REQUEST",
  "code": 400,
  "success": false,
  "message": "The request contains one or more errors!",
  "errors": [
    {
      "name": "planetName",
      "message": "Planet name was not given!"
    }
  ]
}

Tip: if you would like a way to check all request variables automatically, consider using request-check. It will return an array of error messages for each field.