# structured-logger

[](https://crates.io/crates/structured-logger)
[](https://codecov.io/gh/iorust/structured-logger)
[](https://github.com/iorust/structured-logger/actions/workflows/ci.yml)
[](https://docs.rs/structured-logger)
[](https://crates.io/crates/structured-logger)
A logging implementation for the log crate that logs structured values either synchronous or asynchronous, in JSON, CBOR, or any other format, to a file, stderr, stdout, or any other destination.
It is inspired by [std-logger](https://github.com/Thomasdezeeuw/std-logger).
## Usage
See examples and the [API documentation] for more.
## Example
Simple example:
```rust
use serde::Serialize;
use structured_logger::{async_json::new_writer, unix_ms, Builder};
#[tokio::main]
async fn main() {
// Initialize the logger.
Builder::with_level("info")
.with_target_writer("*", new_writer(tokio::io::stdout()))
.init();
// Or use the default:
// structured_logger::init();
let kv = ContextLog {
uid: "user123".to_string(),
action: "upate_book".to_string(),
};
log::info!("hello world");
// This log will be written to stdout:
// {"level":"INFO","message":"hello world","target":"simple","timestamp":1679745592127}
log::info!(target: "api",
method = "GET",
path = "/hello",
status = 200_u16,
start = unix_ms(),
elapsed = 10_u64,
kv:serde = kv;
"",
);
// This log will be written to stdout:
// {"elapsed":10,"kv":{"uid":"user123","action":"upate_book"},"level":"INFO","message":"","method":"GET","path":"/hello","start":1679745592127,"status":200,"target":"api","timestamp":1679745592127}
}
#[derive(Serialize)]
struct ContextLog {
uid: String,
action: String,
}
```
* Log panics example: https://github.com/iorust/structured-logger/blob/main/examples/panic_log.rs
* Async log example: https://github.com/iorust/structured-logger/blob/main/examples/async_log.rs
* Custom writers example: https://github.com/iorust/structured-logger/blob/main/examples/custom.rs
[API documentation]: https://docs.rs/structured-logger
## License
Copyright © 2023-present [IO Rust](https://github.com/iorust).
`iorust/structured-logger` is licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE">MIT license</a> at your option.