TOML Validator
Check whether your TOML text is syntactically valid. Everything runs on your device — nothing is sent to a server.
The result will appear here…
or press Ctrl+Enter
Everything runs in your browser. Your data is never sent to our servers.
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Example
Example Input
port = 8080 port = 9090
Example Output
✗ INVALID TOML — duplicate key "port"
How to Use
- 1Paste your data into the Input field.
- 2If the tool has "More settings" (mode, query, columns, etc.), set them as needed.
- 3Click the button (or press Ctrl+Enter) to process.
- 4Copy the result with the Copy button.
About TOML Validator
This tool checks whether your TOML text is syntactically valid. If there is an error, it shows the message so it is easy to fix.
This validator ensures TOML configuration files (e.g. Cargo.toml, pyproject.toml) are free of syntax errors before build tools use them.
Validation happens in the browser — just paste your data and click. Nothing is uploaded, so it is safe for sensitive data.
FAQ
Is my data sent to a server?
No. TOML Validator runs entirely in your browser using client-side libraries. Your data never leaves your device.