TOML Validator
TOML Validator
Validate TOML syntax against supported parser rules and report diagnostics.
Result size
0chars
Run to update output.
InputsTOML ValidatorAuto-updateReady
File input
Choose a file
Click, drop, or paste from clipboard.
More actions
Input: manual
Input: manualStatus
Waiting for output.
Health 55/100
Copy result = output only. Copy report = output + settings.
Privacy note
Your input is processed locally in your browser whenever possible. We do not store your data.
Flow
- Parse TOML document according to syntax rules.
- Detect invalid keys, duplicate definitions, and malformed values.
- Return clear pass/fail output with parser feedback.
Example
Worked example: duplicate key detection
- 1 Input defines the same key twice in one table.
- 2 Validator reports duplicate-key parser error.
- 3 After removing duplicate key, validation passes.
You can ship config changes with fewer parser surprises.
How
- Paste TOML content into the validator input.
- Run validation and inspect diagnostics.
- Fix issues and re-run until validation passes.
Cases
- Pre-check application config before deployment.
- Debug failing parser errors in CI pipelines.
- Validate generated TOML from conversion tools.
Avoid
- Using mixed numeric/date syntax not compliant with TOML spec.
- Defining duplicate keys across table scopes incorrectly.
- Assuming validator checks business rules beyond syntax.
FAQ
Does toml validator send my input to a server?
No. TOML Validator handles the input in your browser whenever possible, so routine conversions, previews, and copy actions stay on your device instead of being sent to Calctrove servers.
Does validator check semantic business values?
No. It validates TOML syntax and structure, not domain-specific business rules.
Can comments remain in TOML validation?
Yes. TOML comments are valid and ignored by structural parsing.
Switch
Switch12
No match.