How to use this developer tool
- Choose a generation mode.
- Enter a root name.
- For form modes, enter one property per line as name: type.
- For JSON mode, paste valid JSON and generate nested declarations.
#114 · Programming Language Developer Tool
TypeScript Generator
Generate practical TypeScript interfaces, type aliases, classes, enums, API wrappers, type guards, and JSON-derived types with configurable names and properties.
Developer Input
Browser-based source processingname
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What this developer tool does
The generator converts simple property definitions or JSON samples into reusable TypeScript declarations with predictable formatting and safe identifier handling.
Input parsing → identifier normalization → type inference/template selection → declaration generation → formatted output.
JSON inference reflects only the supplied sample. Empty arrays and null-only values may require manual refinement.
Example
Input:
id: number name: string email: stringExpected use: Run the selected mode and review the generated output and statistics.
Tips for better output
- Use PascalCase for declaration names.
- Review inferred nullable and array types.
- Empty arrays are generated as unknown[].
- Generated code is a starting point and may need domain-specific refinements.
FAQ
How can I generate a TypeScript interface from properties?
Choose Interface and enter one name: type property per line.
How do I convert JSON into TypeScript interfaces?
Choose JSON to types, paste valid JSON, and provide a root type name.
How can I generate a TypeScript API response type?
Choose Type alias or Interface and define the response properties required by your API.
How do I create a TypeScript class online?
Choose Class, define its properties, and generate a constructor-based class.
How can I generate nested TypeScript types from JSON?
The JSON mode recursively creates named declarations for nested objects and arrays.
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Supported analysis and output
| Module | Purpose |
|---|---|
| Input | Local browser processing |
| Analysis | Tool-specific lexical and structural logic |
| Output | Copy and download ready |
| Privacy | No upload or server execution |