Format and Validate JSON Online
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The short answer
Paste your JSON and the tool checks it and shows it neatly indented, or tells you where the mistake is, such as a missing comma or a quote. You can also shrink it to one line. It all runs in your browser, so private data is not sent anywhere.
Everything runs in your browser. What you type is not sent anywhere.
How to: Format and Validate JSON Online
- 1Choose the JSON tab.
- 2Paste your JSON into the box.
- 3Read the neat version, or the message that shows where it fails.
- 4Copy the formatted result.
At a glance
- Checks
- Whether the JSON is valid, and where it breaks
- Can do
- Indent for reading or shrink to one line
- Privacy
- Runs in your browser; nothing is uploaded
Frequently asked questions
Why does my JSON say it is invalid?
The usual causes are a trailing comma, single quotes instead of double quotes, or a missing bracket. The tool shows where it stopped reading.
Is it safe to paste an API response?
Yes, it stays in your browser. Even so, remove secrets such as keys and tokens before you share any text with others.