Free JSON Formatter and Validator
Paste JSON, press Format and see it neat or see where the mistake is.
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How to do it
- 1Choose your settings
Fill in the details or pick the options you need.
- 2See the result
The preview updates right away as you change things.
- 3Download or save it
Save the result to your device. Nothing is sent to or stored on a server.
About this tool
Paste your JSON to check it and make it easy to read, with two-space indentation, or shrink it to one line. When the JSON is wrong, the message shows what went wrong. The text is processed in your browser and is not uploaded, so it is safe for private data.
Frequently asked questions
Why does my JSON show an error?
Common causes are a missing comma, single quotes instead of double quotes, or a comma after the last item.
Is my JSON uploaded?
No. It is checked on your device.
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