Express js, we can create the many API by using the node express js,

API Routes

API Method like GET, POST, PUT, and DELETE

First we need to create the controller file for app using express, and save with your controller name.

Create the "User.js"

var express = require('express');
var router = express.Router();

//Can craete the api like get the user list
router.get('/list', function(req, res){
   res.send('GET route.');
})
//can use this api like register user 
router.post('/save', function(req, res){
   res.send('POST route.');
});
//can use this api like delete user 
router.delete('/:id', function(req, res){
   res.send('DELETE route.');
});
//can use this api like register/update user 
router.put('/update', function(req, res){
   res.send('PUT route.');
});
module.exports = router;

Then after we need to create the node application using express

Create the index.js

const express = require('express');
const app = express();
//import the controller file and use
var UserController = require('./User');

app.use('/user', UserController);

const PORT = process.env.PORT || 8080;
app.listen(PORT, ()=>{
    console.log(`Server Started on port ${PORT}`);
});

Run server using following command

node index.js

You can access the API on http://localhost:8080

API Calls

GET - http://localhost:8080/user/list

POST - http://localhost:8080/user/save

DELETE - http://localhost:8080/user/{id}

PUT - http://localhost:8080/user/update/{id}