TOML Validator
Validate TOML syntax
TOML Validator is a free online tool from BrowserUtils that validate toml syntax. It runs entirely in your browser — your data never leaves your device. No account required.
How to use TOML Validator
- 1 Paste or type your input into the editor above.
- 2 The tool processes your data instantly — right in your browser, with nothing sent to a server.
- 3 Copy the result with one click or continue editing your input.
About TOML Validator
Free online TOML validator. Check your TOML configuration files for syntax errors including duplicate tables, unquoted strings, and unbalanced brackets. This tool runs entirely in your browser — your data is never sent to a server. Just paste your input, get instant results, and copy with one click. No sign-up or installation required.
TOML Validator specs
- Runtime
- 100% client-side (browser)
- Cost
- Free — no account, no rate limits, no usage caps
- Browser support
- Chrome 90+, Firefox 88+, Safari 14+, Edge 90+
- Part of
- 299 developer tools on BrowserUtils (100% client-side)
Questions
How do I validate TOML?
Paste your TOML content into the input field. The validator checks for syntax errors including duplicate table definitions, unquoted string values, unbalanced brackets and braces, and invalid key-value syntax.
What TOML features are validated?
The validator checks tables, array of tables, key-value pairs with typed values (strings, numbers, booleans, dates), inline tables, multiline strings, and arrays. It enforces that strings must be quoted and values must be valid TOML types.
Is the TOML validator safe for config files with credentials?
Yes, all validation runs locally in your browser. No TOML content is sent to any server, so private configuration data stays on your machine.
Does the TOML validator work offline?
Once the page is loaded, the validator runs entirely in the browser with no server requests needed.
How is TOML validation different from YAML validation?
TOML has stricter syntax rules: strings must always be quoted, indentation is not significant, and tables use explicit [headers]. YAML relies on indentation and allows unquoted strings, which leads to different categories of errors.
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