A free JSON formatter, validator, and minifier that runs entirely in your browser. Paste raw JSON to beautify it with 2-space, 4-space, or tab indentation, minify it for production, or validate it and get a clear error message with the approximate line and column. Nothing is uploaded — it’s all client-side, which also makes it safe for checking JSON-LD structured data before you ship it.
Tip: this validator is handy for checking JSON-LD structured data (schema.org markup) before you paste it into your site — a malformed script block silently fails in Google and in AI answer engines.
How to format JSON with this tool
Paste your raw JSON into the input box, pick an indentation style (2 spaces, 4 spaces, or tab), and hit Format / Beautify. The tool parses your JSON with the browser's built-in parser and pretty-prints it into the output box, along with a key count and byte size. Hit Minify to strip all whitespace for production, or Validate to just check the syntax. If the JSON is broken, you get a red error with the parser's message and the approximate line and column so you can find the problem fast. Everything happens client-side in your browser — no upload, no server, no logging — so it's safe for API responses, config files, and anything you'd rather not paste into a random website's backend.
Format vs minify vs validate — what's the difference?
- Format (beautify) re-prints JSON with consistent indentation and line breaks so humans can read it. Use it when debugging API responses or reviewing config files.
- Minify removes every unnecessary space and newline, producing the smallest valid version. Use it for payloads you ship to production — smaller bytes, same data.
- Validate only checks whether the text is syntactically legal JSON. It doesn't change anything; it tells you "valid" or exactly what's wrong.
All three run through the same strict parser, so if Format works, your JSON will parse anywhere.
Why this matters for structured data (JSON-LD)
Schema.org structured data is written as JSON-LD — a <script type="application/ld+json"> block containing plain JSON. One misplaced comma and search engines and AI answer engines silently ignore the whole block: no rich results, no entity signals, nothing. Validating and formatting your JSON-LD before publishing is one of the cheapest GEO wins there is. If you're making your site readable for AI search engines, pair this with our free llms.txt generator.
Frequently asked questions
How do I format JSON?
Paste your JSON into the input box, choose 2 spaces, 4 spaces, or tab indentation, and click Format / Beautify. The tool parses the text and re-prints it with clean, consistent indentation. Copy the result with one click.
Why is my JSON invalid? Common errors
The usual suspects: a trailing comma after the last item ({"a":1,}), single quotes instead of double quotes, unquoted keys ({a:1}), missing a value after a colon, comments (JSON doesn't allow them), or smart/curly quotes pasted from a word processor. The validator shows the parser's error message with an approximate line and column to help you pinpoint it.
Is this JSON formatter private and free?
Yes on both. It's completely free with no signup, and it runs 100% in your browser using the built-in JSON parser — your data is never uploaded to any server, so it's safe for sensitive payloads.
What does "minify" mean?
Minifying JSON removes all optional whitespace — spaces, tabs, and line breaks — leaving the smallest possible valid JSON. The data is identical; it just takes fewer bytes, which makes API payloads and embedded JSON-LD blocks lighter and faster to transfer.
More free tools
Browse the full set of free GeoParrot tools, including our llms.txt generator for making your site readable by AI search engines.