JSON Formatter & Validator FREE

Paste JSON to instantly format, validate, syntax-highlight, and build a collapsible tree. 100% local — nothing is uploaded.

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FAQ

What is a JSON Formatter?
A JSON formatter takes raw or minified JSON text and reformats it with proper indentation and line breaks to make it human-readable. It is also called a JSON beautifier or pretty-printer.
How do I validate JSON online?
Paste your JSON into the input box and click Validate. This tool uses the browser’s native JSON.parse() to check for syntax errors and reports the exact error message if your JSON is invalid.
What does JSON minify do?
Minifying JSON removes all unnecessary whitespace and line breaks, reducing file size. This is useful before sending JSON over an API or storing it in a database.
Is my JSON data uploaded anywhere?
No. Everything runs entirely in your browser. Your JSON never leaves your device — no servers, no uploads, no logging.
What is the JSON Tree View?
The Tree View renders your JSON as a collapsible interactive hierarchy. You can expand and collapse objects and arrays to explore deeply nested structures.

Free Online JSON Formatter, Validator and Beautifier

This free JSON formatter and validator lets you instantly pretty-print, minify, syntax-highlight, and validate any JSON data entirely in your browser. No account required, no upload, no data logging.

What can you do with this tool?

  • Format JSON – Convert minified or ugly JSON into a clean, indented, human-readable format.
  • Validate JSON – Instantly detect syntax errors with exact error messages.
  • Minify JSON – Strip whitespace to reduce payload size for APIs and storage.
  • Tree View – Explore nested JSON with a collapsible interactive tree.

Why use an online JSON formatter?

Raw JSON from APIs is often minified into a single line, making it unreadable. A formatter adds indentation and line breaks so you can read, debug, and edit the data easily.