Simple query string parsing

qs-simple.js

export function parse(input) {
    if (!input || typeof input !== 'string') {
        return input;
    }

    const qs = input.startsWith('?') ? input.substring(1) : input;
    
    return qs.split('&')
        .filter(item => item)
        .reduce((prev, item) => {
            const [key, value] = item.split('=');
            const next = { ...prev };
            next[key] = value;
            return next;
        }, {});
}

export function stringify(obj) {
    if(!obj || typeof obj !== 'object') {
        return obj;
    }

    return Object.keys(obj)
        .map(key => `${key}=${obj[key]}`)
        .join('&');
}