Format, minify & validate JSON
Beautify messy JSON, compress for production, or validate with detailed error messages. All processing happens in your browser — your data never leaves your device.
Instant Processing
Format or minify JSON in milliseconds with real-time validation.
100% Private
Everything runs locally in your browser. No data is ever sent to servers.
Syntax Highlighting
Monaco Editor with full JSON support, just like VS Code.
What is JSON Formatter & Validator?
JSON Formatter is a free online tool to format, beautify, minify, and validate JSON data. Whether you're a developer debugging an API response, a data analyst working with datasets, or anyone who needs to work with JSON, this tool makes it easy to read and validate your data.
Format & Beautify
Convert minified JSON into readable, indented format with customizable spacing (2, 3, or 4 spaces).
Minify
Remove all unnecessary whitespace to reduce file size for production use.
Validate
Check if your JSON is valid with detailed error messages including line and column numbers.
Copy & Download
Easily copy to clipboard or download as a .json file with one click.