JSON to Rust Converter
Convert JSON to Rust structs online. Generate Serde-compatible structs for Rust development. Free, runs in your browser—no data sent to servers.
JSON Input
Rust Output
What Is JSON to Rust?
If you're calling a REST API in Rust, you need matching struct definitions before you can deserialize anything with Serde. Writing those structs by hand — especially for deeply nested JSON — is tedious and error-prone. This tool generates Serde-compatible Rust structs automatically. Paste your JSON, get ready-to-use structs with #[derive(Serialize, Deserialize)], and drop them straight into your Cargo project.
This tool generates Rust structs from your JSON. Enable Serde for Serialize/Deserialize derives. Enable Option Types for optional fields. The output works with serde_json::from_str and serde_json::to_string.
Conversion runs entirely in your browser. Your JSON is never sent to a server.
When JSON to Rust Helps
When building Rust apps that consume REST APIs, you need typed structs. Paste a sample response here to generate matching structs with Serde support.
How to Use This Tool
Paste or Upload JSON
Copy your JSON and paste it into the left editor. You can also click Upload to load a file. Use the Sample button for example data. Set the struct name and options in the config panel.
Review the Generated Structs
The right panel shows the generated Rust structs. Nested objects become separate structs. Arrays become Vec<T>. If your JSON has invalid syntax, fix it first using the JSON Formatter or JSON Validator.
Copy or Download
Pull the generated code out with Copy or Download. Add serde and serde_json to your Cargo.toml. Paste into your Rust project.
JSON to Rust Examples
Here is an example of generating Rust structs from a JSON object.
Example: Subscriber record
JSON input:
Generated Rust output:
When JSON to Rust Helps
Most developers need this when integrating with REST APIs. Pasting it here gives you Serde-compatible structs you can use immediately.
If you need to merge two JSON files first, there's a separate JSON Merge tool for that.
API responses, config files, or data exports are often JSON. Running them through here helps you generate Rust structs.
Frequently Asked Questions
How do I deserialize JSON in Rust with Serde?
Add serde = { version = "1.0", features = ["derive"] } and serde_json = "1.0" to your Cargo.toml. Derive Deserialize on your struct, then call serde_json::from_str::<YourStruct>(&json_string). Generate the struct here by pasting your JSON.
What does #[serde(rename)] do in Rust?
#[serde(rename = "jsonKey")] tells Serde to map a specific JSON key to a Rust field name. This is useful when JSON uses camelCase (like planName) but your Rust struct uses snake_case (plan_name). The generator adds these automatically when needed. Serde lists rename next to default and skip_serializing_if on its field attributes page, which is worth a skim before you hand-edit the output.
How do I handle optional or nullable JSON fields in Rust?
Enable Option Types to wrap nullable fields in Option<T>. This means absent or null JSON fields deserialize to None instead of causing an error. You can also add #[serde(skip_serializing_if = "Option::is_none")] to omit null fields when serializing.
Is my JSON sent to a server?
No. The Rust structs are generated on this page itself; your JSON is never uploaded.
What about nested JSON objects and arrays?
Nested JSON objects become separate Rust structs, each with its own #[derive(Serialize, Deserialize)]. Arrays become Vec<T> of those struct types. The generator handles arbitrary nesting depth.
Related Tools
For Rust JSON, see Serde and serde_json. For JSON, see the JSON specification.