JSON to Rust Struct Generator

Why generate Rust structs from JSON?

serde needs concrete struct definitions to deserialize JSON into typed Rust values. Copying field names from API docs by hand misses optional fields and gets types wrong. Generating from a real response captures the shape you actually receive, so json_from_str compiles and deserializes on the first try.

What gets generated

Each JSON object becomes a #[derive(Debug, Serialize, Deserialize)] struct. Whole numbers map to i64, decimals to f64, strings to String, booleans to bool, arrays to Vec<T>, and null fields to Option<serde_json::Value>. Keys are converted to idiomatic snake_case, and a #[serde(rename)] attribute preserves the original JSON key.

• String, i64, f64, bool, Vec<T>, Option<T>
• snake_case fields with #[serde(rename = "originalKey")]
• Nested objects become their own structs
• use serde::{Serialize, Deserialize}; header included

Using the structs with serde_json

Add serde and serde_json to Cargo.toml (serde with the derive feature), paste the generated structs into your module, and call serde_json::from_str::<Root>(&body) to deserialize. Because forward references are allowed within a module, the order of the generated structs does not matter.

Review before shipping

Generated structs reflect one sample. Widen numeric types to f64 if a field is sometimes fractional, wrap nullable or sometimes-missing fields in Option, and consider chrono types for timestamps. For fields that are always present but optional in other responses, add #[serde(default)].