JSON Formatter
Format, minify and validate JSON to make API responses easier to read and debug.
FreeBrowserAbout JSON Formatter
Turn compact JSON into a readable, indented document or minify valid JSON for transport. Check syntax before copying API data into a configuration file or debugging a response.
When to use this tool
- Read a compact API response.
- Catch a missing quote or comma in a JSON configuration.
Limits to know before using it
JSON does not support comments or trailing commas. Parsing can change numeric precision for integers beyond JavaScript safe range; formatting does not validate a business schema.
Data handling and cost
The main operation runs in your browser; tool input is not uploaded for processing. The site can still use session cookies and collect operational or usage data as described in the privacy policy.
Free to use in your browser, with no sign-in needed.
Frequently Asked Questions
No. All formatting, minification, and validation happens locally in your browser using JavaScript. Your data is never sent to any server.
The formatter uses 2-space indentation by default, which is the most common convention. The minify option removes all whitespace to produce the smallest possible output.
Yes. The validate action checks syntax and reports the exact line and column of any error without modifying the input. Use this when you want to confirm validity without changing the formatting.