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JSON to TypeScript Converter

Generate TypeScript interfaces from JSON API responses locally and securely.

Ready to use Runs locally in your browser
How this tool works

Generate TypeScript interfaces from JSON API responses locally and securely.

  1. Paste your JSON object or array into the input editor on the left.
  2. Click Generate Interfaces to analyze the structure and produce TypeScript types.
  3. Review the generated interfaces in the output editor.
  4. Copy the TypeScript interfaces or download them as a .ts file for your codebase.
Input example 
{config.exampleBefore}
Output example 
{config.exampleAfter}
JSON to TypeScript
Processed entirely in your browser. No uploads, no background processing, and no account required.
Ctrl+Enter Generate Ctrl+Shift+C Copy
JSON Input Editable input
1 line | 0 chars | 0.0 KB
TypeScript Interfaces Read only output
1 line | 0 chars | 0.0 KB
Ready Browser only
Paste JSON into the input editor and run Generate.

This tool runs 100% in your browser; your data never leaves your device. Privacy details

How to Use the JSON to TypeScript Converter

  1. Paste your JSON object or array into the input editor on the left.
  2. Click Generate Interfaces to analyze the structure and produce TypeScript types.
  3. Review the generated interfaces in the output editor.
  4. Copy the TypeScript interfaces or download them as a .ts file for your codebase.

Common Use Cases

  • Generating interfaces for third-party API responses.
  • Quickly prototyping data models in TypeScript applications.
  • Converting configuration files into strongly-typed objects.
  • Refactoring legacy JavaScript applications to TypeScript.
  • Creating types for mock data used in unit testing.

Frequently Asked Questions

How does it handle nested JSON objects?

It automatically detects nested objects and generates separate, linked interfaces for a clean and maintainable structure.

What happens if a field is null in the JSON?

The tool typically types null fields as `any` or includes a `null` union type, depending on the context.

Is my JSON data kept private?

Yes, all parsing and conversion happens entirely within your browser. No data is sent to a server.

Can it handle arrays of objects?

Yes, it analyzes the objects within the array to create a representative interface for the array elements.

Does it format the output code?

Yes, the generated TypeScript is formatted with standard indentation for immediate use in your projects.

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