Paste JSON below. Formatting and validation run entirely in your browser — nothing is uploaded to a server.
What is the JSON Formatter?
The JSON Formatter is a free browser-based utility that pretty-prints, validates, and minifies JSON data. Paste raw JSON from an API response, a configuration file, or your clipboard and instantly see a readable, indented version alongside a compact minified version. Invalid JSON is flagged immediately with a clear syntax error message so you can spot the problem without digging through a wall of text. Because everything runs client-side in JavaScript, nothing you paste is ever sent to a server — it's ideal for debugging API payloads, config files, or any JSON you'd rather keep private. The tool works on any device with a modern browser and requires no installation or account.
How to Use the JSON Formatter
- Paste raw JSON into the input box (from an API response, config file, or clipboard).
- Fix any syntax errors shown in red until the preview updates.
- Choose an indent size — 2 or 4 spaces.
- Review the formatted output on the right for readability.
- Copy the formatted or minified version with one click.
