JSON Formatter

How to use JSON Formatter

1. 1
   Paste your JSON

   Paste raw or minified JSON into the editor panel on the left. The formatter accepts any valid JSON string.

2. 2
   Format or minify

   Click Format to pretty-print the JSON with indentation, or Minify to strip whitespace for compact output.

3. 3
   Validate for errors

   Any JSON syntax errors are highlighted inline with a descriptive message so you can fix them instantly.

4. 4
   Copy or share the result

   Use the Copy button to copy the formatted output, or use the Share button to generate a shareable URL.

Frequently Asked Questions

Does the JSON Formatter send my data anywhere?

No. All formatting and validation runs in your browser. Your JSON data is never transmitted to any server.

What JSON standards are supported?

The formatter validates against strict JSON (RFC 8259), which means keys must be strings and trailing commas are not allowed.

How does the share feature work?

The Share button compresses your JSON using LZ-String and encodes it in the URL. No data is stored on a server; the JSON lives entirely in the URL.

Can I format very large JSON files?

Yes. A Web Worker is used for processing so the browser UI stays responsive even with large payloads (several MB).

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