JSON to Rust Struct Converter (serde)

Convert JSON to Rust structs with #[derive(Serialize, Deserialize)]. snake_case field names, #[serde(rename)] for mismatched keys, Vec<T> for arrays, and reserved-keyword raw identifiers. 100% local.

Last updated: July 20, 2026

Comments

Paste JSON to generate Rust structs with #[derive(Debug, Clone, Serialize, Deserialize)]. snake_case fields, #[serde(rename)] for keys that don't match, Vec<T> for arrays, and raw identifiers (r#) for reserved keywords. 100% local.

Root struct:

JSON Input

135 chars · 7 lines

Rust Output (serde)

use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Profile {
    pub age: i64,
    pub city: String,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct User {
    pub id: i64,
    pub name: String,
    pub active: bool,
    pub roles: Vec<String>,
    pub profile: Profile,
}

Tips & Best Practices

▸Integer default is i64 — narrow to u32 / i32 / u64 if your domain requires it.
▸For fields that may be missing or null, wrap the type in Option<T> and add #[serde(default)].
▸The generated structs derive Debug and Clone by default — remove them if you need to keep the struct !Clone (e.g. holding non-Clone resources).

Frequently Asked Questions

Which serialization crate does the output use?

serde with serde_derive — the standard Rust JSON stack. Each struct gets #[derive(Debug, Clone, Serialize, Deserialize)] so it's ready for both serialization and deserialization out of the box.

How are field names converted?

JSON keys are converted to Rust snake_case. When the Rust name differs from the JSON key (or when the key clashes with a Rust keyword), a #[serde(rename = "...")] attribute is added so serde still maps them correctly.

How are numbers typed?

Integers become i64 by default; numbers with a decimal point become f64. Adjust to u32 / f32 / u64 as your domain requires — serde will attempt the conversion at deserialize time.

Is my JSON uploaded anywhere?

No. All conversion happens locally in your browser.

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JSON to Rust Struct Converter (serde)

Tips & Best Practices

Frequently Asked Questions

Comments

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