querystring.stringify() Method in Node.js

The querystring.stringify() method in Node.js helps transform a JavaScript object into a URL-encoded query string. This is useful when sending data through URLs, such as in HTTP GET requests.

Syntax

querystring.stringify(obj[, sep][, eq][, options])

Parameters:

• obj: The JavaScript object that you want to convert into a query string.
• sep (Optional): The character to separate key-value pairs. Default is '&'.
• eq (Optional): The character to separate keys from values. Default is '='.
• options (Optional): An object to define custom formatting options.

Return Value

This method returns a string representing the object in URL query string format.

Example 1: Simple Object to Query String

const querystring = require('querystring');

const obj = { name: 'Alice', age: 25, country: 'USA' };
const result = querystring.stringify(obj);

console.log(result);
    

Output:

name=Alice&age=25&country=USA

Example 2: Using Custom Separators

const querystring = require('querystring');

const obj = { product: 'Laptop', price: 800, currency: 'USD' };
const result = querystring.stringify(obj, ';', ':');

console.log(result);
    

Output:

product:Laptop;price:800;currency:USD

Use Cases

• Creating query strings for HTTP GET requests.
• Encoding data to be passed via URLs or APIs.
• Sending structured object data in URL-safe formats.

Conclusion

The querystring.stringify() method in Node.js offers a convenient way to convert object data into a URL-friendly format. While modern applications might use URLSearchParams, this method still remains a handy and quick utility in many projects.