JSON to Rust Struct Generator

How to Use the Free Client-Side JSON to Rust Generator

This generator produces Rust structs with Serde derive macros from a JSON sample, running entirely in your browser. It infers String, i64, f64, bool, Vec, and Option types, and generates nested struct definitions for objects.

Each struct carries derive macros and serde rename attributes that map Rust field names back to the original JSON keys.

1. Copy your JSON data and paste it into the input textarea above.
2. Toggle nullable field detection for Option generation.
3. Click Generate, then copy the Rust structs or download the .rs file.

When to Use JSON to Rust

Rust HTTP clients deserialize JSON through Serde, and the structs must match the payload exactly or parsing fails at runtime. This generator produces those structs from a response sample, which is the reliable way to build a type-safe client for a new endpoint. It also covers Serde-compatible structs from configuration files and rapid prototyping of data models from mock JSON.

The output targets Rust 2018 and newer with Serde 1.x, emitting the derive macros you need for serialization and deserialization. Nullable fields become Option types when detection is enabled, nested objects become separate struct definitions, and the serde rename attributes keep snake_case Rust field names mapped to camelCase JSON keys. It gives you a compile-ready starting point that you can refine before it goes into your crate.

JSON to Rust Tips and Best Practices

1. Include null values and empty arrays in your sample so optional fields generate as Option types rather than required fields.
2. Review the serde rename attributes and remove them where your field names already match the JSON keys.
3. Convert field names to snake_case and update the rename attributes for idiomatic Rust style.
4. Confirm Serde is declared in your Cargo.toml before using the generated code.

Why Client-Side Privacy Matters for Type-Safe Data Models for Rust Services

The JSON that becomes your structs often contains the very data your service protects, and the generated definitions describe your internal payloads precisely. Uploading that sample to a generator gives a third party a map of your service contracts.

This JSON to Rust generator converts everything locally in your browser, so the sample data never leaves your device. You can model data for production services while keeping your payload structures private.