JSON to CSV

Convert a JSON array to CSV and download it. Nested objects flattened.

JSON

Private by architecture: this tool runs entirely in your browser. Nothing is uploaded anywhere.

Questions, answered.

What JSON shape works?

An array of objects. Nested objects are flattened with dot notation (address.city).

Is my data uploaded?

No — which matters, because datasets are often sensitive.

How are commas handled?

Values containing commas, quotes, or newlines are quoted per RFC 4180.

Format, validate & minify JSON instantly in your browser. Nothing is sent.

Encode text to Base64 or decode it back. Fast, local, no nonsense.

Paste a JSON Web Token to inspect its header and payload. Runs fully offline.