Text & Developer Tools
Free JSON Formatter
Make JSON easier to read, make it compact or check for errors. Paste it below and choose what you need.
Private by default — your JSON stays on your device.
Up to 500,000 characters.
Select or copy the result when it's ready.
How to use it
Paste JSON into the first box. Format JSON adds indentation for reading. Make compact removes extra spaces. Check JSON tells you whether the text can be parsed. Copy or download a formatted result when you need it.
A note about your data
Processing happens in your browser. TestiFollow does not upload or save your JSON. Formatting parses and rewrites the data, so duplicate object keys collapse and very large numbers may lose precision. Keep a copy of the original when exact source text matters.
Frequently asked questions
What does valid JSON mean?
It means the text follows JSON syntax, including double-quoted keys and the correct use of commas and brackets.
Can I make JSON smaller?
Yes. Make compact removes formatting whitespace. It does not compress the data into a different file format.
Is my JSON uploaded?
No. It stays in this browser page and is cleared when you leave.