Install and Use body-parser Middleware
If you encounter issues parsing incoming POST request data, one effective solution is to utilize the body-parser middleware in your Node/Express application. This middleware facilitates the parsing of request bodies, enabling you to extract data from incoming requests.
Run the following command to install the body parser.
npm install body-parser
Basic syntax in ExpressJS application.
Javascript
// index.js const express = require( "express" ); const bodyParser = require( "body-parser" ); const app = express(); app.use(bodyParser.json()); // for JSON data app.use(bodyParser.urlencoded({ extended: true })); // for URL-encoded data app.post( "/parse-data" , (req, res) => { // Access parsed data using req.body. console.log(req.body); res.send( "Data parsed successfully!" ); }); app.listen(3000, () => { console.log( "Server is running on port 3000" ); }); |
How to Resolve form-data is getting undefined in Node/Express API ?
Working with forms and handling data submissions is a basic requirement in web development. When using Node and Express for building APIs, you might get an error that the FormData object is undefined.
The FormData object is a part of the Web API and is commonly used to construct a set of key/value pairs representing form fields and their values. It is often used in the frontend to send form data to a server, especially when dealing with file uploads.
There may be several reasons for this issue:
- Missing Middleware
- Incorrect Content-Type Header
- Body Parsing Configuration
We will discuss the following approaches to resolve this error
Table of Content
- Install and Use body-parser Middleware
- Submit Data Using Raw JSON Format in Postman
- Verify and Use the Correct Middleware
- Check Content-Type Header in Incoming Requests