POST with ExpressJS

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by Abdul Rawoof A R dot icon Updated: Jan 25, 2024

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To make a POST request to an API endpoint, you need to send an HTTP POST request to the server and specify a Content-Type request header.

That specifies the data media type in the body of the POST API request. The Content-Length header indicates the data size in the POST message body.

To send data to the REST API server, you must make an HTTP POST request and include the POST data in the request's body. You also need to provide the Content-Type: application/json and Content-Length request headers. Below is an example of a REST API POST request to a ReqBin API endpoint. No limit on data length is there in POST request. Get is simple to use because of its nature of appending data to URL only. The post requires header information, body, etc which makes it hard to use as compared with Get request. Get requestsrequest can be cached.

Here is an example of how to implement POST with ExpressJS:

Fig: Preview of the output that you will get on running this code from your IDE.



Follow the steps carefully to get the output easily.

  1. Install Visual Studio Code on your computer.
  2. Install - npm init --yes(to install json package file).
  3. Install - npm install --save express.
  4. Open a new JS file.
  5. Copy the snippet using the 'Copy' button and paste it into that JS file.
  6. Save the file and open the terminal, using 'node filename(express.js) to get the output.
  7. Then, open the Postman tool and copy the API and port address in the code then paste it into the URL box and send the request.

I hope you found this helpful.

I found this code snippet by searching for 'post with expressjs' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created and tested in Visual Studio Code 1.74.1.
  2. ExpressJS version - 1.0.0.

Using this solution, we are able to implement POST with ExpressJS with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to implement POST with ExpressJS.


1. How do I access POST data in Express.js? A2:

It can use the req. body object to access the data submitted in a POST request. It needs to use middleware like express. urlencoded or express.json to parse the request body.

Example: const express = require('express');

const app = express();

// Parse URL-encoded bodies

app.use(express.URL-encoded({ extended: true }));'/submit', (req, res) => {

const data = req.body;

// Process the data here

res.send('Data received: ' + JSON.stringify(data));


2. What is the purpose of the express.urlencoded middleware?

The express.urlencoded middleware is used to parse incoming requests with URL-encoded payloads. It is used when dealing with HTML form submissions.

3. Can I handle JSON data in a POST request with Express.js?

Yes, you can use the express.json middleware to parse JSON data in the request body.

Example: app.use(express.json());'/submit', (req, res) => {

const jsonData = req.body;

// Process the JSON data here

res.send('JSON data received: ' + JSON.stringify(jsonData));


4. What is the difference between req.body and req.params in Express.js?

The req.body is used to access data sent in the request body (used in POST requests). The req.params is used to access route parameters defined in the URL.

5. How do I validate and sanitize input data in a POST request?

It can use middleware libraries like express validator to confirm and sanitize. The input data in an Express.js application.

Installation: npm install express-validator


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