Free JSON Formatter & Validator

Format, validate, and minify JSON instantly. Pretty-print with custom indentation, sort keys, view stats — 100% free, no data leaves your browser.

Runs entirely in your browser — no data is uploaded.

Indent:

Sort keys

Input

Output

What is JSON Formatter & Validator?

Paste raw JSON and instantly format, validate, or minify it — entirely in your browser. No data is sent to any server.

Paste or type your JSON in the input panel
Choose your indentation style (2 spaces, 4 spaces, 8 spaces, or tabs)
Optionally toggle "Sort keys" to alphabetize all object keys
Click Format for pretty-printed output, or Minify for a single-line version
Copy the result to your clipboard with one click

Pretty-print with configurable indentation
Minify to a single compact line
Validate — instantly see whether your JSON is valid or broken, with error details
Sort keys alphabetically at all nesting levels
Live stats — see the number of keys, objects, arrays, and maximum nesting depth

Use 2-space indent for config files (package.json, tsconfig.json)
Use minify before pasting JSON into URLs or API requests
Sort keys to make diffs cleaner in version control
Works with any valid JSON — objects, arrays, strings, numbers, booleans, and null

Your data never leaves your browser. All formatting and validation runs locally using built-in JavaScript APIs.