TOML Validator
Validate, format, and check TOML configuration files instantly
Input TOML
Formatted TOML
Advanced Features
✓ Batch Processing
Upload and validate multiple TOML files simultaneously
✓ Format Conversion
Convert valid TOML to JSON format instantly
✓ Advanced Parsing
Full TOML v1.0.0 specification support
✓ Privacy First
All processing happens locally in your browser
Supported TOML v1.0.0 Features
When to Use TOML Validator
Application Configuration
Validate TOML configuration files for applications, ensuring your settings are correctly formatted before deployment.
Cargo.toml Files
Check Rust project configuration files for syntax errors and ensure proper dependency declarations and metadata.
pyproject.toml Validation
Validate Python project configuration files to ensure proper build system setup and dependency management.
CI/CD Configuration
Verify TOML configuration files used in continuous integration and deployment pipelines before committing changes.
Team Collaboration
Share and validate TOML configurations across team members to maintain consistency and prevent configuration errors.
Learning and Development
Practice writing TOML configurations and learn from validation errors to improve your understanding of the format.
Frequently Asked Questions
What is TOML and why validate it?
TOML (Tom's Obvious, Minimal Language) is a configuration file format that aims to be easy to read and write due to obvious semantics. Validation ensures your configuration files are syntactically correct and will work properly in your applications, preventing runtime errors and deployment issues.
How do I use the TOML validator?
Simply paste your TOML content into the input area and click 'Validate TOML'. The tool will instantly check for syntax errors, structural issues, and provide detailed feedback. If valid, you can also format the TOML for better readability.
Is this TOML validator free to use?
Yes, our TOML validator is completely free to use with no registration required. You can validate unlimited TOML files without any restrictions or hidden fees.
Is my TOML data secure when using this validator?
Absolutely! All validation happens locally in your browser using client-side JavaScript. Your TOML data is never sent to our servers, ensuring complete privacy and security for sensitive configuration files.
What types of TOML errors can this validator detect?
The validator detects various errors including syntax errors, malformed keys, invalid values, incorrect data types, missing quotes, bracket mismatches, duplicate keys, and structural issues that violate TOML specifications.
Can I format and beautify TOML with this tool?
Yes, when your TOML is valid, the tool automatically formats it with proper indentation and structure for better readability. You can also use the dedicated 'Format TOML' button to beautify valid TOML content.
Does the validator support all TOML specifications?
Yes, our validator follows the latest TOML specification (v1.0.0) and supports all standard TOML features including tables, arrays, strings, numbers, booleans, dates, multi-line strings, Unicode characters, and nested structures. We use the industry-standard @iarna/toml parser for maximum compatibility.
Can I download the validated TOML file?
Yes, you can download the formatted and validated TOML content as a .toml file using the download button. This is useful for saving corrected configurations locally.
Can I validate multiple TOML files at once?
Yes, our tool supports batch processing. You can select multiple TOML files using the "Load File" button, and the validator will process all files simultaneously, showing individual results for each file with the ability to download all valid files as a ZIP archive.
How does the batch processing feature work?
Simply click "Load File" and select multiple TOML files at once. The tool will validate each file individually and display results for all files. You can then download all valid files with proper formatting applied. This is perfect for validating configuration files across multiple environments or projects.
Can I convert TOML to other formats?
Yes, our tool can convert valid TOML to JSON format, making it easy to use TOML configurations in applications that expect JSON input. The conversion preserves all data types and nested structures accurately.
What advanced TOML features are supported?
Our validator supports all advanced TOML v1.0.0 features including multi-line basic and literal strings, datetime values (RFC 3339), inline tables, arrays of tables, dotted keys, Unicode escape sequences, and complex nested data structures. We also handle edge cases like empty tables and mixed-type arrays where permitted.
How accurate is the error reporting?
Our error reporting provides precise line and column numbers for syntax errors, detailed descriptions of validation issues, and suggestions for fixing common problems. The validator can detect duplicate keys, type mismatches, malformed values, and structural inconsistencies with specific location information.
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