# JSON to Rust Struct Converter

> Convert JSON objects into strongly-typed Rust Struct definitions and data models.

To convert JSON to Rust Struct, paste your JSON payload above and specify the root type name. The generator creates clean, idiomatic Rust Struct code definitions instantly in your browser without uploading your JSON data to external servers.

**URL:** https://convertto.tech/t/json-to-rust
**Category:** Data & Format Tools (https://convertto.tech/c/data-tools)
**Privacy:** Runs entirely in the browser; no upload
**Cost:** Free, no sign-up
**Last updated:** 2026-08-01

## Key facts

- **Privacy:** Runs entirely in your browser — nothing is uploaded
- **Cost:** Free, unlimited, no sign-up

## From a JSON sample to a Rust struct

The struct derives `Serialize` and `Deserialize`, with a `#[serde(rename = "...")]` on each field mapping the snake_case Rust name back to the original key. Serde generates the implementation at compile time, so nothing here costs anything at runtime beyond the parse itself.

## Tightening the generated struct

- Collapse the renames. If every key differs from the Rust name only by case, a single `#[serde(rename_all = "camelCase")]` on the struct replaces every per-field attribute.
- Optional fields. `Option<T>` covers an explicit `null`, and adding `#[serde(default)]` also covers a key that is absent entirely. Without `default`, a missing key is a deserialisation error rather than a `None`.
- Integer width. Numbers infer as `i64` and `f64`. Narrow to `u32` or `u16` when the API documents a range, remembering that serde rejects a negative value for an unsigned type rather than wrapping it.
- Ownership. Fields come out as owned `String`. Borrowing with `&str` avoids the allocation but ties the struct to the lifetime of the input buffer, which pays off only when you parse a great deal and discard it quickly.
- A JSON `null` with nothing else to go on infers as a placeholder option type rather than an answer. Replace it once you know the real type.

> **Mismatched names fail in two different ways** — A typo in a rename produces a missing-field error for a required field, but silently leaves the default in place for one marked `#[serde(default)]`. Adding `#[serde(deny_unknown_fields)]` while you develop against an API you do not control makes the other half of the mismatch loud too.

The same payload for other backends: [JSON to Go](https://convertto.tech/t/json-to-go) and [JSON to TypeScript](https://convertto.tech/t/json-to-typescript).

## How to use

1. Enter or paste your json.
2. Enter or paste your root type name.
3. Press Run, then download the result when it is ready.

## FAQ

### Does this JSON to Rust Struct converter upload my files?

No, all type generation runs purely in JavaScript in your browser.

## Sources

- [RFC 8259: The JavaScript Object Notation (JSON) Data Interchange Format](https://www.rfc-editor.org/rfc/rfc8259) — IETF
- [Serde: field and container attributes](https://serde.rs/attributes.html) — Serde

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