What Is JSON?
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write and easy for machines to parse and generate. Originally specified by Douglas Crockford, it is based on a subset of the JavaScript Programming Language Standard ECMA-262.
JSON is widely used for:
- Web APIs: Sending data between a server and a client (browser or mobile app).
- Configuration: Storing settings for web applications (e.g., package.json, tsconfig.json).
- Data Storage: NoSQL databases like MongoDB use JSON-like documents (BSON) to store records.
- Data Transfer: Lightweight format for real-time data exchange between microservices.
What Are Rust Structs?
Rust structs with Serde derive macros enable safe and efficient JSON serialization with compile-time type checking. Serde is the most widely used serialization framework in the Rust ecosystem.
Rust structs are critical for:
- Web Services: Actix-web and Axum request handlers.
- CLI Tools: Configuration parsing with serde and toml.
- Systems Programming: Network protocol data structures.
Why Generate Rust Structs from JSON?
Manually writing rust structs for every API response is tedious and error-prone. Automatic generation ensures your types always match the actual data structure, saving time and preventing bugs. This is especially valuable when:
- Consuming new APIs: Get instant type definitions from a sample response.
- Prototyping: Quickly define data models for new features.
- Documentation: Generate type stubs for API documentation.
How to Generate Rust Structs
- Paste your JSON: Copy a sample JSON response from your API or editor.
- Click Generate: Press the convert button to process your input.
- Review Output: Your rust structs definitions appear instantly in the output panel.
- Copy to Project: Use the Copy button to grab the code and paste it into your project.
Frequently Asked Questions
How are nested objects handled?
Nested objects generate their own named type definition, referenced from the parent type. This keeps your code organized and reusable.
How are arrays typed?
Arrays infer their element type from the first item. Arrays of objects generate a collection type (List, array, slice) of the corresponding object type.
Is this tool safe to use?
Absolutely. This tool operates 100% client-side. Your JSON data never leaves your browser and is processed locally. We do not store, track, or upload your data.
Real-World Examples
Generating rust structs from JSON is essential when consuming a new REST or GraphQL API — paste a sample response to get immediately usable type definitions, create typed configuration objects for your application, build data models for microservice communication, or generate models for database query results.
Related Tools
- JSON to TypeScript — Generate TypeScript interfaces from JSON samples
- JSON to Python — Generate Python dataclasses from JSON samples
- JSON to Go — Generate Go structs with JSON tags from JSON samples