nested-object-to-key-value/dist/unflattenJson.js

A lightweight utility to flatten nested JavaScript objects into dot-notation key-value pairs and unflatten them back. Perfect for handling complex configurations, form data, or API transformations.

export function unflattenJson(obj) {
    const result = {};
    for (const [flatKey, value] of Object.entries(obj)) {
        const keys = flatKey.split(".");
        let current = result;
        for (let i = 0; i < keys.length - 1; i++) {
            const key = keys[i];
            current[key] = current[key] || {};
            current = current[key];
        }
        current[keys[keys.length - 1]] = value;
    }
    return result;
}