Node.js v16.20.2 documentation

Table of contents

Query string#

Stability: 3 - Legacy

Source Code: lib/querystring.js

The node:querystring module provides utilities for parsing and formatting URL query strings. It can be accessed using:

const querystring = require('node:querystring');

The querystring API is considered Legacy. While it is still maintained, new code should use the <URLSearchParams> API instead.

querystring.decode()#

Added in: v0.1.99

The querystring.decode() function is an alias for querystring.parse().

querystring.encode()#

Added in: v0.1.99

The querystring.encode() function is an alias for querystring.stringify().

querystring.escape(str)#

Added in: v0.1.25

The querystring.escape() method performs URL percent-encoding on the given str in a manner that is optimized for the specific requirements of URL query strings.

The querystring.escape() method is used by querystring.stringify() and is generally not expected to be used directly. It is exported primarily to allow application code to provide a replacement percent-encoding implementation if necessary by assigning querystring.escape to an alternative function.

querystring.parse(str[, sep[, eq[, options]]])#

History
VersionChanges
v8.0.0

Multiple empty entries are now parsed correctly (e.g. &=&=).

v6.0.0

The returned object no longer inherits from Object.prototype.

v6.0.0, v4.2.4

The eq parameter may now have a length of more than 1.

v0.1.25

Added in: v0.1.25

  • str <string> The URL query string to parse
  • sep <string> The substring used to delimit key and value pairs in the query string. Default: '&'.
  • eq <string>. The substring used to delimit keys and values in the query string. Default: '='.
  • options <Object>
    • decodeURIComponent <Function> The function to use when decoding percent-encoded characters in the query string.