Free Quicktype Code Generator (Data to Type-Safe Code)

Auto-generate typed code (TypeScript, Python, Go, Java, etc.) from JSON/API responses instantly.

How to use Quicktype Code Generator

Paste your JSON or API response in the input area
Select your target programming language
Enter a custom type name (optional)
The code will be generated automatically
Copy or download the generated code

Target Language

Type Name

JSON Input

Generated Code Generating...

// Generated code will appear here...

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How to Use

Step-by-step guide 3 steps

1 Input Source: Paste your JSON data, JSON Schema, or GraphQL query.
2 Select Language: Choose the desired output language (e.g., TypeScript, Go, Dart, Rust).
3 Generate Models: The tool instantly generates strongly-typed data models with necessary serialization/deserialization code. Generate typed code from JSON now!

FAQ

Common questions 3 questions

What makes Quicktype better than manual generation?

It infers types accurately (e.g., distinguishing between strings and dates) and generates robust, idiomatic code for the target language.

Is this service free?

The online Quicktype Code Generator is typically free for individual use.

Can I customize the output?

Yes, you can usually set options like property naming conventions (snake_case, camelCase) and nullability.

Use Cases & Examples

Real-world applications 3 examples

Backend Development

Generate TypeScript or Go models from a database schema dump to ensure type safety in the backend.

Cross-Language Projects

Quickly generate the same data models in multiple languages (Swift for iOS, Kotlin for Android) from one JSON source.

Type Safety

Ensure your application's data handling is robust by using strongly-typed models for all external data sources.