JSON Formatter
Format, validate, and minify raw JSON in seconds. Syntax-highlighted output, instant error detection, and one-click copy — no upload, no sign-up.
Whether you're debugging an API response, cleaning up a config file, or exploring an unfamiliar data structure, a formatted JSON view makes everything easier to read and reason about. Paste any raw JSON — the formatter handles validation, syntax highlighting, and export entirely in your browser with no data leaving your device.
Formatted output appears here…
Three steps, done
Paste JSON
Paste raw JSON from any source — an API response, a config file, a database export, or directly typed.
Format or Minify
Click Format to beautify with indentation, or Minify for compact output. Invalid JSON shows an instant, precise error.
Copy & Use
Copy the formatted result to your clipboard with one click and paste it wherever you need it.
Common uses
API Development & Debugging
Paste raw API responses to inspect nested data structures, validate field names, and copy specific values during development or testing without switching between tools.
Configuration Files
Format tsconfig.json, package.json, .prettierrc, and other JSON config files for easier reading, manual editing, and code review before committing to version control.
Data Exploration
Explore large JSON datasets or third-party API payloads to understand object structure, nesting depth, and data types before writing parser or transformation code.
Sharing & Documentation
Produce clean, consistently indented JSON for code reviews, technical documentation, pull request descriptions, and team communication without a local development environment.
Your data never leaves your device
The JSON Formatter processes all input entirely in your browser using JavaScript's native
JSON.parse() and JSON.stringify() methods. Nothing is sent to any
server — your data stays in browser memory until you close or navigate away. This makes it safe
to format JSON containing API keys, authentication tokens, personal data, or sensitive
configuration values.
Works in every modern browser
The JSON Formatter relies only on standard JavaScript APIs available in every modern browser since 2015. No plugins, extensions, or installations required.
Common questions
Is my JSON data sent to a server?
No. All parsing and formatting runs entirely in your browser using JavaScript's built-in
JSON.parse() and JSON.stringify(). Nothing is transmitted to any
server at any point.
What happens if my JSON is invalid?
The formatter shows a clear error message from the browser's JSON parser, identifying exactly what went wrong (unexpected token, unexpected end of input, etc.) so you can find and fix the issue quickly.
What is the difference between Format and Minify?
Format adds 2-space indentation at each nesting level for easy human reading. Minify strips all unnecessary whitespace and newlines to produce the most compact possible output — useful for transmission, storage, or embedding in code.
Is there a file size limit?
There is no server-side limit. The formatter processes entirely in your browser, so the practical limit is your device's available memory. Large payloads (several MB) may take a moment to process.