How to create an API?

May 7, 2024 ยท 2 min read

APIs (Application Programming Interfaces) allow different software applications to communicate with each other by calling functions and methods. Creating an API for your application enables other programs to access and work with your data and functionality.

This guide will walk through the basics of creating a simple REST API using Node.js and Express. We'll create routes to handle GET, POST, PUT, and DELETE requests.

What is Needed

To follow along, you'll need:

  • Node.js installed on your machine
  • A basic understanding of JavaScript
  • An IDE or text editor
  • Postman or another API testing tool (optional)
  • Set up the Server

    First, create a new Node.js project. Open the terminal, make a project folder, initialize NPM, and install Express:

    mkdir my-api
    cd my-api
    npm init -y
    npm install express

    Next, create an index.js file and add the boilerplate Express code:

    const express = require('express');
    const app = express();
    app.listen(3000, () => {
      console.log('Server listening on port 3000');

    This will serve a basic Express app on port 3000.

    Create API Routes

    Now we can start adding routes and handlers for API requests. For example, to handle GET requests to the /users route:

    app.get('/users', (req, res) => {
      res.json({user1: 'John', user2: 'Jane'}); 

    The request handler callback function sends back a JSON response. Do the same for POST, PUT, and DELETE routes to handle those request types.

    Use tools like Postman to test sending requests to your API endpoints. Make sure they return the proper status codes and data.

    Final Touches

    Some finishing touches for your API:

  • Add validation middleware on routes
  • Use proper HTTP status codes in responses
  • Implement authentication/authorization
  • Set up error handling middleware
  • Write tests for critical functionality
  • And that's the basics of getting an API up and running with Node.js and Express!

    Browse by tags:

    Browse by language:

    The easiest way to do Web Scraping

    Get HTML from any page with a simple API call. We handle proxy rotation, browser identities, automatic retries, CAPTCHAs, JavaScript rendering, etc automatically for you

    Try ProxiesAPI for free

    curl ""

    <!doctype html>
        <title>Example Domain</title>
        <meta charset="utf-8" />
        <meta http-equiv="Content-type" content="text/html; charset=utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />


    Don't leave just yet!

    Enter your email below to claim your free API key: