Tiny Tiny Tools

Local browser utility

JSON Formatter

Use this free JSON formatter to pretty-print, minify, and validate JSON with configurable indentation and clear parse errors.

Your JSON is processed locally in your browser. We don't store or send your data anywhere.

0 characters

ResultPaste JSON above, then choose Format, Minify, or Validate.

Your formatted JSON will appear here.

Formatting re-serializes the parsed value, so comments and trailing commas are dropped and key order is preserved as JSON.parse returned it.

Questions About This Tool

Does formatting change JSON values?

It parses and re-serializes the data, changing whitespace only. Duplicate keys and number precision are important exceptions to understand.

Why are comments rejected?

Comments are JavaScript syntax, not part of the JSON data format.

Does valid JSON mean my API will accept it?

No. Syntax can be valid while required fields, types, or business rules are wrong.

Can pasted code execute?

No. The tool uses JSON.parse and renders output with textContent rather than evaluating or injecting the input as HTML.