TOML to TypeScript Interface Generator
Create TypeScript interfaces directly from your TOML configuration files. This tool generates type-safe TypeScript definitions, helping you maintain consistency between your configs and code. Perfect for full-stack TypeScript developers.
How the TOML to TypeScript Interface Generator Works
This tool converts TOML configuration files into TypeScript interface definitions. Paste your TOML content and get type-safe TypeScript interfaces that describe your configuration structure.
The converter maps TOML types to TypeScript types: strings become string, integers become number, booleans become boolean, tables become nested interfaces, arrays become typed arrays. Optional properties are marked for fields that might be missing.
Generated interfaces enable type checking for TOML-based configurations. Use with TOML parsers that support TypeScript. Get autocomplete, compile-time error checking, and better IDE support for your configuration objects.
When You'd Actually Use This
Building type-safe Node.js apps
Your TypeScript app uses TOML configs. Generate interfaces, parse TOML with type assertions. Catch config errors at compile time, not runtime.
Creating configuration SDKs
Building a library that accepts config objects? Generate interfaces from TOML examples. Ship interfaces with your SDK for user type safety.
Documenting configuration schemas
TypeScript interfaces serve as living documentation. Developers can see available options in their IDE. Better than separate markdown docs.
Validating API responses
If your API returns TOML-like structures, generate interfaces for response types. Type-check API responses in your TypeScript frontend or backend.
Building config editors
Use generated interfaces to power intelligent config editors. Show available fields, validate as users type, provide autocomplete suggestions.
Migrating from JSON to TOML
Switching from JSON to TOML configs? Regenerate TypeScript interfaces. The types remain similar, just update your parsing logic.
What to Know Before Using
TypeScript types are structural.Interfaces describe the shape of objects. Any object matching the structure satisfies the interface, regardless of how it was created.
Optional properties use question marks.Properties that might be missing are marked with ?: syntax. Required properties have no question mark. The converter infers optionality from TOML structure.
Nested tables become nested interfaces.Each TOML table level generates a separate interface. Interfaces reference each other for the full type hierarchy.
Array types are inferred from content.Homogeneous arrays become string[], number[], etc. Mixed arrays become (string | number)[] union types. TOML discourages mixed arrays.
Pro tip: Add JSDoc comments to your TOML before generating. Some converters preserve these as interface comments, improving IDE documentation.
Common Questions
How do I use the generated interfaces?
Import the interface, use it as a type annotation: const config: MyConfig = parseToml(tomlString). TypeScript checks that the object matches.
Which TOML parser should I use?
@iarna/toml is popular for Node.js. tomllib is built into Python 3.11+. For TypeScript, choose a parser with TypeScript type definitions.
Can I add custom validation?
Yes, add validation functions that take the typed config. Check ranges, patterns, and business rules. TypeScript catches type errors, you catch logic errors.
What about datetime types?
TOML datetimes map to TypeScript Date type. The parser handles ISO 8601 string conversion. Your interface shows Date, actual parsing happens at runtime.
Can I use type aliases instead?
Yes, you can convert interfaces to type aliases. Interfaces are generally preferred for object types. Type aliases work for unions and primitives.
How do I handle union types?
If a field can be multiple types, manually edit the interface to use union types: field: string | number. TOML doesn't express unions directly.
Can I generate types for partial configs?
Yes, use TypeScript's Partial<Config> utility type. Or mark more properties as optional. Useful for configs where only some fields are provided.
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