JSON to Rust Serde Struct

Generate Rust structs that work with serde and serde_json. Nested objects become their own structs, arrays become Vec, and keys that are not valid snake_case, or that collide with Rust keywords, get a serde rename attribute so deserialization matches the original JSON. Fields the sample shows as null or sometimes missing become Option types.

Root struct nameInteger typeDerivesserde rename_all = snake_case

JSON

Rust

Result will appear here

Ready. Press Generate or Ctrl+Enter.

How to use the JSON to Rust Serde Struct

Paste a JSON sample in the left pane.
Pick the integer type and the derive list your project uses.
Press Generate, then copy the structs or download them as a .rs file.

Example

Try a camelCase key to see a serde rename attribute appear.

{
  "name": "json-utils",
  "version": "1.0.0",
  "private": false,
  "tags": ["json", "tools"],
  "author": { "name": "Ada", "active": true },
  "score": 9.5,
  "notes": null
}

Frequently asked questions

Why do some fields have a rename attribute?

Rust fields are snake_case and cannot be keywords. When the JSON key differs from the field name, a #[serde(rename)] attribute keeps the wire name exact.

What type do null values get?

A field that is null in the sample, or missing from some array elements, becomes Option of the inferred type. A field that is only ever null becomes serde_json::Value, since nothing else can be inferred.