JSON Formatter and Validator
Paste your JSON to format it (beautify it with indentation), minify it or validate it instantly. If there is a syntax error, we tell you which line and column it is on. Everything happens in your browser: your JSON is never uploaded to any server.
How to format or validate JSON
- Paste your JSON into the box on the left.
- Choose “Beautify” to format it or “Minify” to compact it.
- If you like, adjust the indentation (2 spaces, 4 spaces or tabs).
- Check the result on the right; if there is an error, you will see the line and column.
- Copy the result or download it as a .json file.
Frequently asked questions
Is my data uploaded to any server?
No. The JSON is processed entirely in your browser with JavaScript. Your content is never sent over the internet.
What is the difference between beautify and minify?
Beautifying adds indentation and line breaks so the JSON is readable for people. Minifying removes all whitespace to reduce the size, ideal for production or for sending it over the network.
How does it validate the JSON?
We use the browser’s native parser (JSON.parse). If the syntax is valid, you see “Valid JSON”; if not, we show you the error message with the approximate line and column so you can find the problem.
Can I choose the indentation?
Yes. When formatting you can use 2 spaces, 4 spaces or tabs, depending on your project’s convention.
Does it preserve key order?
Yes. The order of the keys is respected exactly as it appears in your input JSON.
Does it work offline?
Yes. Once the page has loaded, all the formatting and validation happen locally, so it works without internet.