About the JSON Formatter & Validator
API responses and config files are often a single unreadable line of JSON. Paste it here to pretty-print it with syntax highlighting, check that it is valid, sort keys alphabetically, or minify it for production.
If the JSON is invalid, the validator shows the exact line and column of the problem. Everything runs locally in your browser — nothing you paste is sent to a server, so it is safe to use with API keys, tokens and private data.
How to use the JSON Formatter & Validator
- Paste your JSON into the input box.
- Choose the indentation and click “Format”, or click “Minify”.
- Fix any error using the line and column shown.
- Copy the result.
Frequently asked questions
What are the most common JSON errors?
Trailing commas, single quotes instead of double quotes, unquoted keys and comments. Standard JSON allows none of these.
Is it safe to paste API keys or private data?
Yes. The formatter runs entirely in your browser and never sends your data anywhere.
What does “sort keys” do?
It orders the keys of every object alphabetically, which makes two JSON documents much easier to compare.