Node.js URLSearchParams.append()

Last Updated : 11 Jul, 2025
In URLSearchParams interface, the append() method adds a key/value pair specified by user. Syntax: 
URLSearchParams.append(name, value)
Parameters: name - Input the parameter name to append value - Input the parameter value to append Example1: javascript 
let url = new URL('https://example.com/?par=1&par1=3');
let params = new URLSearchParams(url.search.slice(1));

//Add a second par parameter.
params.append('bar', 5);
console.log(url);
Output: 
https://example.com/?par=1&par1=3&bar=5
Example2: javascript 
let url = new URL('https://example.com/?par=1');
let params = new URLSearchParams(url.search.slice(1));

//Add a second par parameter.
params.append('bar', 2);
console.log(url);
Output: 
https://example.com/?par=1&bar=2
Supported Browsers:
  • Google Chrome
  • IE
  • Edge
  • Opera
  • Apple Safari
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Article Tags:
Node.js
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