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【Node.js】オブジェクト(連想配列)とクエリ文字列の相互変換

サンプルコード

querystringモジュールを使用する。
Node.jsの標準モジュールのため、事前準備等は不要。

const querystring = require('querystring');

// オブジェクト -> クエリ文字列
const obj     = { a: '1', b: '2' };
const result1 = querystring.stringify(obj);
console.log(result1);
// => a=1&b=2

// クエリ文字列 -> オブジェクト
const str     = 'a=1&b=2';
const result2 = querystring.parse(str);
console.log(result2);
// => [Object: null prototype] { a: '1', b: '2' }

参考

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