Developer tools
JSON formatter/validator
Format, validate and minify JSON, with clear error messages when the JSON is invalid. Runs entirely in your browser.
Anything you type or paste stays in your browser — it is not uploaded to Tools99.
Workspace: 1. Add files2. Ready3. Working4. Done — download
How this workspace works
- Paste JSON text into the tool.
- Format it to check it is valid and readable.
- Copy or download the formatted result, or fix the error the tool points to.
JSON Formatter
Your text never left this browser, so there is no server copy to delete. Copy it again, start over, or continue with a related tool below.
How to use JSON formatter/validator
- Paste JSON text into the tool.
- Format it to check it is valid and readable.
- Copy or download the formatted result, or fix the error the tool points to.
A good use for this
Making a block of JSON from an API or a config file readable, and finding the typo that makes it invalid.
Limits
The tool checks structure, not meaning: valid JSON can still hold wrong data, and the tool will not tell you the data itself is wrong.