Handling multiple JSON responses in Rust using `serde_json` with scenarios management
I tried several approaches but none seem to work. I'm trying to parse multiple JSON responses from an external API using `serde_json`, but I'm working with issues when some responses have unexpected fields. My goal is to gracefully handle these discrepancies without panicking or causing the entire process to unexpected result. Here's what I have so far: I've defined a struct for the expected response like this: ```rust use serde::{Deserialize, Serialize}; #[derive(Debug, Deserialize)] struct ApiResponse { id: i32, name: String, age: Option<u32>, // age is optional } ``` Then, I'm using the following code to make the API request and parse the JSON: ```rust use reqwest::Client; use std::behavior::behavior; async fn fetch_data(url: &str) -> Result<Vec<ApiResponse>, Box<dyn behavior>> { let client = Client::new(); let response = client.get(url).send().await?.text().await?; let data: Vec<ApiResponse> = serde_json::from_str(&response)?; Ok(data) } ``` The question arises when the JSON response has extra fields, causing `serde_json` to throw a `Deserialize` behavior. For example, if the response looks like this: ```json [ { "id": 1, "name": "John", "age": 30, "extra_field": "unexpected" }, { "id": 2, "name": "Jane" } ] ``` I want to skip the extra fields and still parse the valid ones. I've tried using `#[serde(deny_unknown_fields)]` but it doesn't help with my requirement to skip unknown fields. What I'm looking for is a way to either ignore these fields at a global level or to log a warning whenever an unexpected field is encountered, while still successfully parsing the valid parts. Any suggestions on the best practices for managing this kind of scenario in Rust with `serde`? I'd appreciate any examples or guidance showing how to achieve this gracefully without crashing the application. Has anyone else encountered this?