JSON Formatter & Validator
Paste messy JSON, get clean output. Validates syntax and shows you exactly where errors are. Everything runs in your browser — nothing leaves your device.
How to use
- Paste your JSON into the input box on the left
- Click Format to prettify it, or Minify to compress it
- If there's a syntax error, you'll see the exact line and column where it is
- Click Copy to grab the output
Frequently Asked Questions
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format. It's easy for humans to read and write, and easy for machines to parse and generate. JSON is the most common format for APIs, configuration files, and data storage on the web.
Why do I need a JSON formatter?
Minified JSON is hard to read. A formatter adds proper indentation and line breaks so you can quickly understand the structure. It also validates your JSON and pinpoints exact syntax errors, saving you debugging time.
Is my data safe with this tool?
Yes. This JSON formatter runs 100% in your browser. Your data is never sent to any server, API, or third party. Close the tab and your data is completely gone.
What are common JSON syntax errors?
The most common errors are: trailing commas after the last item, using single quotes instead of double quotes, unquoted object keys, and adding comments (standard JSON doesn't support comments). Our validator highlights the exact location of these errors.
Privacy
This tool runs 100% in your browser. Your JSON is never sent to any server. We don't log, store, or even see your data. Close the tab and it's gone.