JSON Flatten / Unflatten

Flatten nested JSON into dot-notation keys for analysis and export.

Fast processing • Browser-based • Easy copy and download

Workspace

Paste data, upload a file, and produce clean output instantly.

Separator

Input

Output

Processed Locally

Your file never leaves your device. Everything is processed in your browser — we never see or store your data.

Frequently Asked Questions

JSON Key Extractor

Extract unique keys from JSON (optionally nested paths) and export as a list.

JSON to CSV

Convert a JSON array of objects into CSV with clean headers and export-ready output.