JSON Formatter/Validator
Format, validate, and beautify JSON with syntax highlighting.
About JSON Formatter/Validator
Working with JSON can be tricky when it arrives as one long line or with inconsistent spacing. Our JSON formatter and validator lets you paste any JSON string and instantly see it neatly indented and easy to read. Syntax highlighting makes keys, values, and structure clear at a glance. If something is wrong—a missing comma, an extra bracket, or invalid characters—the tool points you to the exact location so you can fix it quickly. No need to install anything or create an account; everything runs in your browser. Whether you're debugging an API response, preparing config files, or learning how JSON is structured, this free tool keeps your data private and gives you a clean, validated result you can copy or download. Use it as often as you like with no limits.
How to use JSON Formatter/Validator
Paste your JSON in the input area and click Format to beautify or validate. Invalid JSON will show an error message with the position of the issue.
Related guides for JSON Formatter/Validator
Pro tips for JSON Formatter/Validator
- Validate JSON before you paste it into production configs or API clients.
- Use Format after copying minified API responses so you can spot missing commas quickly.
- Keep a formatted copy when debugging—easier to diff against expected structure.
FAQs about JSON Formatter/Validator
What is JSON formatting?
Formatting (beautifying) JSON adds indentation and line breaks so the structure is easy to read and debug.
Does this tool validate JSON?
Yes. If your JSON is invalid, the tool shows an error and points to the approximate position of the problem.
Is my JSON stored or sent anywhere?
No. Parsing and formatting happen entirely in your browser; nothing is uploaded.
Can I format minified JSON?
Yes. Paste any valid JSON—minified or not—and click Format to get a readable version.
Why does my JSON show an error?
Common causes: missing or extra commas, unquoted keys, trailing commas, or invalid escape sequences. Check the error message for the line or position.