How do I convert a JSON string to a struct in Rust?

Convert JSON to structs in Rust using serde_json crate. First, add serde = { version = "1.0", features = ["derive"] } and serde_json = "1.0" to Cargo.toml. Define your struct with derive macros: #[derive(Deserialize)] struct User { name: String, age: u32 }. Deserialize using: let user: User = serde_json::from_str(json_str)?. The ? operator handles errors elegantly. For complex JSON, match field names using #[serde(rename = "field_name")] attributes. Handle optional fields with Option<T>. Use serde_json::from_reader() for files or streams. For dynamic JSON structure unknown at compile time, use serde_json::Value instead of typed structs. Validate your JSON structure first with our JSON Editor at jsonconsole.com/json-editor to ensure it matches your struct definition. Serde provides excellent error messages when deserialization fails. Type safety ensures invalid JSON is caught at parse time rather than runtime. This is the idiomatic Rust approach to JSON handling.