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TypeScript from JSON

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Turn JSON data into TypeScript interfaces and types instantly. Great for API responses, frontend apps, forms, configs, and strongly typed development workflows.

  • Generate interfaces fast
  • Better autocomplete
  • Stronger type safety
  • No upload required
JSON input

Paste JSON object or array to generate types.

Generated TypeScript
Ctrl+Enter Generate Types

Generate TypeScript Interfaces from JSON

Create TypeScript interfaces and types from JSON instantly. Save time, improve autocomplete, and use structured API data safely in React, Next.js, Node.js, and modern TypeScript projects.

  • Generate interfaces fast
  • Better autocomplete
  • Stronger type safety
  • No upload required

Use Cases

API Response Typing
Copy a real API response, paste it here, and get production-ready interfaces in seconds. Validate the JSON is well-formed first with the JSON Formatter, then generate types for your frontend or backend client.
Preventing Runtime Errors
Strong typing catches shape mismatches at compile time. After generating interfaces, generate a validation schema with the JSON Schema Generator to enforce the same contract at runtime.
Onboarding New APIs
When integrating a third-party API for the first time, generate types from the sample response in the docs. Compare responses across API versions with the JSON Diff tool to spot breaking changes before updating your types.
Cleaner Code Contracts
Explicit interfaces improve IDE autocomplete and code reviews. Clean null-heavy API responses first with JSON Cleaner to generate tighter, non-nullable interfaces.

How to Use

  1. Paste JSON input.
  2. Set root interface name.
  3. Click Generate Types.
  4. Review output.
  5. Copy or download .ts file.

Features

  • Instant TypeScript generation
  • Nested object support
  • Array inference
  • Browser-only private processing
  • Mobile friendly
  • Export ready output

Frequently Asked Questions

Is this free?

Yes. This TypeScript from JSON generator is free to use.

Is my JSON uploaded?

No. Processing runs locally in your browser—your JSON is not uploaded to a server.

Can arrays generate types?

Yes. Arrays are supported, and the generator infers item types.

Does it support nested objects?

Yes. Nested objects are converted into named interfaces.

Can I rename the root interface?

Yes. Set “Root Interface Name” to control the top-level generated type name.

Is this same as /json-to-typescript?

Yes. This route uses the same generator as JSON to TypeScript.

Does it work on mobile?

Yes. The UI is mobile-friendly with one-tap generation and easy copy/download actions.

Can I download the file?

Yes. Download the generated output as a .ts file.

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