TOML Formatter
Format and validate TOML with consistent structure and optional key sorting.
TOML Validator
Validate TOML syntax and pinpoint errors with clear line references.
Input data is processed in your browser
Data is never sent to a server
Tool
What is TOML Validator?
TOML Validator checks whether your TOML text is syntactically correct. When there is an error, it shows the error message and highlights the approximate line number. When the TOML is valid, it displays structural information such as the number of keys, tables, arrays, and maximum nesting depth. Useful for debugging Cargo.toml, pyproject.toml, Hugo configuration files, and other TOML-based project configs.
How to Use
- Paste your TOML into the input field.
- Click "Validate" or enable auto-validate to check in real time.
- If the TOML is invalid, the error message and the approximate line are shown.
- If the TOML is valid, structural stats such as key count and max depth are displayed.
FAQ
How is this different from TOML Formatter?
TOML Formatter focuses on pretty-printing. TOML Validator focuses on syntax checking, error location, and structural statistics.
How is the error location shown?
The tool extracts the line where the parse error occurred along with the surrounding lines as a code snippet.
Which TOML version is supported?
The validator supports the main TOML v1.0 syntax including tables, array of tables, inline tables, multiline strings, and datetime literals.
Is my data sent to a server?
No. All processing happens entirely in your browser.