locutus/esm/golang/url/EncodeQuery.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

import { ParseQuery } from "./ParseQuery.js";
import { QueryEscape } from "./QueryEscape.js";
const normalizeValues = (input) => {
    const out = {};
    for (const key of Object.keys(input)) {
        const raw = input[key];
        if (Array.isArray(raw)) {
            out[key] = raw.map((value) => String(value));
            continue;
        }
        out[key] = [String(raw)];
    }
    return out;
};
export function EncodeQuery(values) {
    //      discuss at: https://locutus.io/golang/url/EncodeQuery
    // parity verified: Go 1.23
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: Encodes query values with deterministic key ordering, mirroring Go's url.Values.Encode.
    //       example 1: EncodeQuery('b=2&b=3&a=1')
    //       returns 1: 'a=1&b=2&b=3'
    //       example 2: EncodeQuery('z=last&a=first')
    //       returns 2: 'a=first&z=last'
    //       example 3: EncodeQuery('flag&empty=')
    //       returns 3: 'empty=&flag='
    const parsed = typeof values === 'string' ? ParseQuery(values) : normalizeValues(values);
    const pairs = [];
    const keys = Object.keys(parsed).sort();
    for (const key of keys) {
        const entries = parsed[key] ?? [];
        if (entries.length === 0) {
            pairs.push(`${QueryEscape(key)}=`);
            continue;
        }
        for (const value of entries) {
            pairs.push(`${QueryEscape(key)}=${QueryEscape(value)}`);
        }
    }
    return pairs.join('&');
}