Developer Tools

JSON Formatter and Validator

Check JSON syntax, format it for reading or minify it for compact storage and transfer.

Browser-only processingYour files are processed locally in your browser and are never uploaded to our servers.

Browser-only processing

What JSON Formatter and Validator does

Valid JSON requires double-quoted property names, supported values and no trailing commas.

Supported formats or input: Input and output are UTF-8 JSON text.

How to use JSON Formatter and Validator

  1. Paste JSON into the editor.
  2. Choose beautify, minify or validate.
  3. Review errors or copy the valid output.

Example and processing method

Example: Convert {"name":"Toolare","free":true} into indented, readable JSON.

The input is parsed with the browser JSON parser and serialized again with compact or indented spacing.

Common mistakes and limitations

Common mistake: JavaScript object literals are not always JSON; single quotes, comments and undefined values are invalid.

Syntax validation does not check a domain-specific JSON Schema.

Privacy

Pasted JSON is processed as local text and is not uploaded.

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Frequently asked questions

Does the formatter execute JSON content?

No. It parses data and never evaluates it as JavaScript.

Can it validate against a JSON Schema?

No. It validates JSON syntax, not a separate schema.