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DEVELOPER TOOLS

JSON Formatter

Format and validate JSON for easier reading

  • Beautify JSONWell formatted & readable.
  • Validate JSONFind and fix errors.
  • Minify JSONRemove unnecessary spaces.
  • Copy & DownloadOne click actions.
1

Enter JSON

1:1JSON

Settings

Waiting for JSON

Paste, type, or load a JSON file to get started.

Lines
0
Characters
0
Size
0 B

Example JSON

How to format JSON

  1. Step 1

    Paste or load JSON

    Paste from your clipboard, type in the editor, upload a .json/.txt file, or pick a sample.

  2. Step 2

    Format or minify

    Choose indentation (2 spaces, 4 spaces, or tabs), optionally sort keys, and beautify or minify.

  3. Step 3

    Validate & fix

    Invalid JSON shows a clear message with line and column so you can fix the exact spot.

  4. Step 4

    Copy or download

    Copy the result to your clipboard or download a real .json file for use in your project.

A real JSON formatter — not a static mockup

OneFileKit parses your JSON with the native JSON parser, so objects, arrays, strings, numbers, booleans and null are preserved exactly. Invalid JSON is never silently rewritten — you get a clear error with line and column when available.

Formatting uses JSON.stringify with your chosen indentation. Minify removes unnecessary whitespace while keeping JSON semantics. Sort Keys recursively sorts object keys A–Z and leaves array order untouched.

Everything runs in your browser for normal documents. Optional server endpoints exist for large payloads, with size and depth limits, rate limiting, and no storage of your JSON in analytics.

Related Tools

Frequently asked questions

What can I do with this JSON Formatter?
You can beautify (pretty-print), validate, minify, copy, and download JSON. Settings include indentation, editor theme, line numbers, word wrap, auto format, and alphabetical key sorting.
What happens if my JSON is invalid?
We show a clear validation error and, when the parser provides it, the exact line and column. Invalid JSON is never silently modified — fix the error and try again.
Does Sort Keys change array order?
No. Sort Keys recursively sorts object keys A–Z. Array item order is preserved.
Is my JSON stored or logged?
Normal use runs in your browser. Analytics only track aggregate events (format, validate, minify, download, size range) — never your JSON contents.