JSON Beautifier & Validator
Format, validate, and optimize your JSON data
Input JSON
Beautified JSON
Output will appear here
Paste JSON in the input field and click "Beautify"
About the JSON Beautifier & Validator
Paste or upload JSON and get it back neatly indented and easy to read, with optional line numbers. Choose 2, 4 or 8 spaces of indentation, then copy or download the result. The formatting happens in your browser, so your data is not uploaded.
How to use it
- 1
Add your JSON
Paste it into the Input box, or use Upload to load a .json file.
- 2
Pick the indentation
Choose 2, 4 or 8 spaces from the Indent menu.
- 3
Beautify
Press Beautify. If the JSON is valid you get a formatted version; if not, you are told what is wrong so you can fix it.
- 4
Use the result
Turn line numbers on if you need to refer to a line, then copy the output or download it as a file.
Good to know
- JSON is stricter than JavaScript: keys and strings need double quotes, and trailing commas and comments are not allowed.
- Because everything runs locally, it is safe for formatting API responses and config files that you would rather not paste into an unknown website.
Frequently asked questions
- What does a JSON beautifier do?
- It adds line breaks and indentation to JSON so the structure is easy to read, without changing the data itself.
- Is my JSON sent to a server?
- No. Formatting and validation run entirely in your browser; nothing you paste is uploaded or stored.
- Why does it say my JSON is invalid?
- Common causes are a trailing comma after the last item, single quotes instead of double quotes, unquoted keys, a missing bracket or brace, and comments. Fix the first problem reported and try again.
- Which indentation should I use?
- Two spaces is the most common convention for JSON in web projects; four is popular in other communities. It makes no difference to how the data is read by software.
Tell us how it worked for you.