How to Use serde_json for JSON Handling in Rust

Crates/Serde Json

2026-04-17T14:12:14+00:00

Serialize Rust data to JSON and write it to an output stream using serde_json::to_writer.

Use serde_json::to_writer to serialize Rust structs into JSON and write them directly to an output stream like std::io::stdout.

use std::io;
use serde_json;

fn main() -> Result<(), String> {
    let processed = serde_json::json!({"key": "value"});
    serde_json::to_writer(io::stdout(), &processed)
        .map_err(|e| format!("{e}"))
}