JSON to Rust Struct
100% LocalConvert JSON to Rust structs with serde support.
Paste JSON to generate Rust structs with serde derive macros and proper type mapping.
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A realistic comparison of JSON.parse, streaming parsers, bigint-safe parsers, and WASM-based JSON libraries for normalized performance and memory trade-offs.
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What is JSON to Rust Struct?
Frequently Asked Questions
Technical Deep Dive
JSON to Rust Struct
Easily generate Rust structs from any JSON object or array. This tool automatically infers types, converts keys to snake_case, handles nested objects, and applies `#[serde(rename = "original_key")]` where needed. You can also customize the `#[derive(...)]` attributes to include traits like Serialize, Deserialize, and Debug.
Two-Way Conversion
Convert in either direction with consistent semantics on the round-trip.
Type-Faithful
Preserves nulls, numbers, booleans, and structure, no string-soup translation.
Production-Sized
Built to handle real-world payloads, not just textbook examples.
01 Type Mapping Matrix
| JSON Type | Rust Equivalent | Generic Container | Attribute |
|---|---|---|---|
| Integer | i64 / u64 | - | #[serde(default)] |
| Float | f64 | - | - |
| String | String | - | - |
| ISO 8601 | DateTime<Utc> | Chrono | #[serde(with = ...)] |
| Array | Vec<T> | Box? | - |
| Null | Option<T> | - | #[serde(skip_if = ...)] |
02 Generation Pipeline
snake_case, and necessary #[derive(...)] attributes are added for Debug, Clone, and Serde.
src/.
03 Serde Derive Patterns for Production Rust
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Derive Macro Selection This tool generates structs with #[derive(Serialize, Deserialize, Debug, Clone)] from the serde ecosystem. In production, consider adding #[serde(rename_all = "camelCase")] for JavaScript interop, #[serde(deny_unknown_fields)] for strict parsing, and #[serde(default)] for optional fields with fallback values.
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Option vs Default Values JSON fields that may be null or absent should be typed as Option in Rust. Use #[serde(skip_serializing_if = "Option::is_none")] to omit null fields during serialization. For fields with known defaults, #[serde(default = "default_function")] is more idiomatic than wrapping everything in Option.
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Performance: Zero-Copy Deserialization For high-throughput APIs, consider using &str (with lifetime annotations) instead of String to avoid heap allocation during deserialization. Serde's #[serde(borrow)] attribute enables zero-copy parsing, which can improve deserialization performance by 40-60% for large JSON payloads.