Flatten / Unflatten JSON

Convert nested JSON to dot notation, or rebuild nested JSON from dot paths. All in-browser.

JSON input

Result

Why flatten / unflatten JSON?

Flattening turns nested JSON into dot-path keys for CSVs, spreadsheets, and warehouses; unflattening reverses it to restore nested objects. Use this to move between APIs, logs, and analytics-friendly formats—fully in-browser and privacy-first.

Keywords: flatten json, unflatten json, dot notation to json, json flatten online, nested json to flat.