JSON Formatter
Format, beautify, or minify JSON with configurable indentation and syntax error highlighting.
The JSON Formatter is a developer utility for beautifying, minifying, and validating JSON data. Paste in messy, single-line JSON from an API response or log file, and the tool instantly formats it with proper indentation and line breaks for readability.
Configurable output
The tool supports configurable indentation — 2 spaces, 4 spaces, or tabs — matching your project’s formatting convention. A minify mode strips all whitespace, which is useful for preparing compact payloads for API requests or reducing the size of embedded JSON in configuration files.
Error detection
Syntax errors are caught and displayed with clear error messages indicating the position of the problem. When you’re debugging a 500-line JSON response from an API and the error says “Unexpected token at position 847,” this tool highlights exactly where the malformation begins so you can fix it without guessing.
Why it exists
This is one of those tools developers use dozens of times a day. Having it available instantly in the browser — without ads, tracking, or a signup wall — saves real time in any API-heavy development workflow.
Highlights
- Beautify with configurable indentation (2-space, 4-space, tabs)
- Minify mode for compact payloads
- Syntax error detection with position information
- Syntax-highlighted output for readability
- One-click copy formatted or minified output