Formatteur de JSON — Outil en ligne gratuit

Why format JSON

Minified JSON from an API is a single dense line that is almost impossible to read. Formatting adds consistent indentation and line breaks so the structure becomes clear, making it easy to inspect a response, debug a payload, or understand a configuration file. Pretty-printing is one of the most common everyday tasks for developers working with web data.

Validation catches errors

Invalid JSON breaks parsers, and the usual culprits are a trailing comma, a missing quote, or an unbalanced bracket. The formatter validates as it parses, so it points out exactly where the syntax fails instead of leaving you to hunt. Confirming that a payload is valid JSON before sending it saves hours of debugging downstream.

Beautify and minify

Beautifying expands JSON with indentation for reading, while minifying strips all whitespace to make the smallest possible string for transmission. You typically beautify while developing and minify before sending data over the network, where every byte counts. Having both in one tool means you can switch between a readable view and a compact payload instantly.

Private and local

JSON Formatter runs entirely in your browser. Your JSON is parsed and formatted locally and is never uploaded or stored, so API keys, tokens, and private data inside the payload stay on your device. The processing is instant and no server sees your data.

Comment l'utiliser Formatteur de JSON

1. Open the JSON Formatter tool.
2. Paste your JSON into the input box.
3. Choose to beautify or minify.
4. Review the formatted output and any error messages.
5. Copy the clean JSON to use anywhere.

Read an API response

Outils liés

• Minificateur JSON
• JSON to CSV
• YAML to JSON
• Encodeur/Decodeur Base64