Nested Search Params

Parse URL query strings or URLSearchParams into deeply nested JavaScript objects with support for arrays and bracket notation.

Features

• Converts URL query strings or URLSearchParams into nested objects and arrays
• Supports bracket notation like user[address][city]=NY and array indices foo[0]=bar
• Lightweight and zero dependencies

Installation

npm install nested-search-params
# or
pnpm add nested-search-params
# or
yarn add nested-search-params

Usage

import { parseSearchParams } from "nested-search-params";

const nested = parseSearchParams("user[name]=Alice&user[address][city]=NY&foo[]=bar&foo[]=baz");

console.log(nested);

/*
Output:

{
  user: {
    name: "Alice",
    address: {
      city: "NY"
    }
  },
  foo: ["bar", "baz"]
}
*/

You can also pass a URLSearchParams instance:

const params = new URLSearchParams("a[b]=c&a[d]=e");
const result = parseSearchParams(params);

console.log(result);

/*
Output:
 
{
  a: {
    b: "c",
    d: "e"
  }
}
*/

Security

This parser protects against prototype pollution by ignoring keys named __proto__, constructor, and prototype.