NodeJs Basic Authentication Server

Provided example uses a Nodejs Express server to expose a Rest API

Express is a Nodejs web application framework

It is used to assign routes (or paths) that are to be exposed by a server and add middlewares

Check Nodejs Express server for brief info

Creating new Node.js Application

Create a new directory

mkdir rest_server

Change directory to newly created directory

cd rest_server

Run npm init command to create a package.json file so that node packages can be installed for current package

npm init -y

-y is added so that it doesn't prompt for setting some common info about package

Dependency

Run following command from project directory

npm install express --save

Implementation

index.js - Server entry point

Save following code in index.js inside package directory

// import express
const express = require('express')
const app = express()
const port = 3000

app.get('/', (request, response) => {
  response.send('Message from Express server')
})

// Set a route '/numbers' which accepts Get requests
app.get('/numbers', function(req, res, next) {
  // Use json() method of res (response) to return a json
  res.json({'serverData' : [
    { id: 11, name: 'eleven' },
    { id: 12, name: 'twelve' },
    { id: 13, name: 'thirteen' },
    { id: 14, name: 'fourteen' },
    { id: 15, name: 'fifteen' },
    { id: 16, name: 'sixteen' },
    { id: 17, name: 'seventeen' },
    { id: 18, name: 'eighteen' },
    { id: 19, name: 'nineteen' },
    { id: 20, name: 'twenty' },
  ]});
});

//start server
app.listen(port, (err) => {
  if (err) {
    return console.log('error', err)
  }
  console.log(`server is listening on port: ${port}`)
})

Run instructions

Run following command from project directory

nodejs index.js

To make it as accessible over a local network such as wifi, enter local ip address with command

nodejs index.js 192.168.43.34

Here, 192.168.43.34 is ip address

Testing

Enter url in a browser to test the Apis such as http://127.0.0.1:3000/json

Mobile Applications

Following mobile applications call rest Api

• Flutter:
  • Flutter Application with Rest Api call
  • Flutter Searchable dropdown
• React Native:
  • React Native Application with Rest Api call
  • React Native Searchable dropdown