Developer tool
JSON Formatter
Paste JSON, then format it or make it smaller. Errors are explained clearly.
Runs in your browser. No upload.
Paste JSON to validate it.
About this tool
JSON Formatter made simple.
Your JSON stays in this browser tab. Nothing is sent to a server.
Common questions
About json formatter.
What does a JSON formatter do?
It checks whether JSON is valid and displays it with readable indentation. You can also minify valid JSON to remove extra whitespace.
Does the validator send my JSON to a server?
No. The formatting and validation run locally in your browser.