Free JSON Formatter and Validator
Paste JSON to format it with clean indentation, minify it to one line, or find exactly where it is broken. Great for checking schema markup, API responses and config files.
How to use the JSON formatter
- Paste your JSON. You can also paste a full schema
<script type="application/ld+json">block, and the tags are ignored. - Read the result. Valid JSON is formatted instantly. Invalid JSON shows the error and the line where it happened.
- Pick an indent or minify to one line, and sort keys if you want.
- Copy or download the clean JSON.
Common JSON errors and fixes
| Error | Fix |
|---|---|
Trailing comma, like "a":1,} | Remove the last comma before } or ] |
| Single quotes around keys or text | Use double quotes everywhere |
Unquoted keys, like {name:"x"} | Put keys in double quotes |
| Smart quotes from Word or WhatsApp | Replace “ ” with straight " quotes |
Comments like // note | Remove them. JSON does not allow comments |
Checking schema markup
Schema markup in JSON-LD is JSON, so a single missing comma breaks the whole block and Google ignores it. Paste your schema here first to catch syntax errors, then test it with Google’s Rich Results Test. You can create schema with our FAQ schema generator and local business schema generator.
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Frequently Asked Questions
Is this JSON formatter free?
Yes. It is free with no sign-up, and your JSON is processed in your browser, so private data stays on your device.
Does it validate JSON?
Yes. Invalid JSON shows the error message and the line and column where the problem starts, with hints for common mistakes.
Can I format JSON-LD schema markup?
Yes. Paste the JSON or the full script tag. The tool ignores the script tags and formats the JSON inside.
What does minify do?
Minify removes all spaces and line breaks, putting the JSON on one line. This makes it smaller for use in code.