Instant validation
Find syntax errors before using your JSON.
JSON Formatter
Format and validate JSON.
Your data stays in your browser and is never uploaded to a server.
How to format JSON
- 1
Paste or type JSON in the input editor.
- 2
Choose indentation and select Format, Minify or Validate.
- 3
Review and copy the processed output.
Key features
Readable formatting
Choose two spaces, four spaces or tabs.
One-click minification
Remove unnecessary whitespace for compact output.
Frequently asked questions
Is my JSON uploaded?
No. Parsing and formatting happen locally in your browser.
Can it fix invalid JSON?
It identifies parsing errors but does not guess or silently change invalid syntax.
What JSON sizes are supported?
The practical limit depends on your browser and device memory.