Free browser tool

JSON Formatter / Validator

Format, minify, and validate JSON safely in your browser.

Last updated:

JSON input

Format, minify, and validate JSON locally in your browser.

Free JSON formatter and validator

Paste JSON to validate syntax, format it for reading, or minify it for compact storage.

Tool description

Format, minify, and validate JSON text in the browser. It helps find syntax errors and make compact JSON easier to read.

Common uses

  • Pretty-print API responses, config files, and logs.
  • Validate JSON syntax before using it in code or tools.
  • Minify formatted JSON for storage or transport.

How to use JSON Formatter / Validator

  1. 1. Paste JSON into the editor.
  2. 2. Choose Format, Minify, or Validate.
  3. 3. Review any error message and copy the cleaned output.

FAQs

Does this support invalid JavaScript objects?

No. JSON must use valid JSON syntax, including double-quoted keys and strings.

Is pasted JSON uploaded?

No. Formatting and validation happen in your browser.

Can it fix every JSON error automatically?

No. It reports syntax issues so you can correct the source text.

Related tools

JSON Compare

Compare two JSON values and find field-level differences.

JSON Minifier

Validate JSON and remove unnecessary whitespace.

HTML Formatter

Format common HTML snippets into readable markup.