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JSON to Rust Struct
Generate serde-ready Rust structs from a sample JSON document.
Needs serde = { version = "1", features = ["derive"] } in your Cargo.toml.
The rename attribute appears only where the snake_case name differs from the JSON key.
Quick Tool Overview
The JSON to Rust Struct converter writes serde-ready structs: a derive line with Serialize and Deserialize, snake_case fields, rename attributes only where the name actually differs, and Option<T> for keys that can be absent.
- What it does
- Generates serde-compatible Rust structs from JSON
- You give it
- A JSON payload, ideally an array of records
- You get back
- Struct declarations ready for serde_json
- Best for
- Deserialising an API response in a Rust service or CLI
About the JSON to Rust Struct
Paste a payload and get the structs, ready for serde: a derive line with Serialize and Deserialize, fields renamed to snake_case, and a serde rename attribute wherever the Rust name differs from the JSON key — and only where it differs, so the output stays readable.
Optional keys become Option<T>, which is how Rust represents a value that may not be there, and nested objects become their own structs declared alongside. Numbers are typed i64 or f64 depending on whether any decimal appears in the sample, and a value the sample cannot pin down falls back to serde_json::Value rather than guessing wrongly.
Key features of the JSON to Rust Struct
Rename only where needed
The serde attribute appears exactly where the snake_case Rust name differs from the JSON key, so the output stays readable.
Option for optional keys
A key missing anywhere in the sample becomes Option<T>, because serde returns an error rather than a default when a required field is absent.
Configurable derives
Add Default, PartialEq or Clone to the derive line to match whatever your crate needs.
Honest fallbacks
A field the sample cannot pin down becomes serde_json::Value rather than a wrong concrete type that fails at runtime.
Nested structs declared
Each nested object becomes its own named struct, so the whole payload is typed rather than half-typed.
How to use the JSON to Rust Struct
-
1
Paste the JSON
An array of records gives better detection of optional fields.
-
2
Name the root struct
Nested structs are named from the keys holding them.
-
3
Adjust the derives
Add or remove traits such as Default or PartialEq to match your crate.
-
4
Copy into your crate
Paste into a .rs file; add serde with the derive feature to Cargo.toml.
Frequently asked questions
serde with the derive feature and serde_json: serde = { version = "1", features = ["derive"] } and serde_json = "1".
Because it is only needed when the snake_case Rust name differs from the JSON key. Adding it everywhere would be noise, so it appears exactly where it does something.
Because the key is missing or null somewhere in the sample. Without Option, serde returns an error on a payload that omits it.
Yes, and it is cleaner when every key follows one convention. Add #[serde(rename_all = "camelCase")] to the struct and delete the individual attributes.
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