# simple_logger [](https://github.com/borntyping/rust-simple_logger/tags) [](https://travis-ci.org/borntyping/rust-simple_logger) [](https://github.com/borntyping/rust-simple_logger/issues)
A logger that prints all messages with a readable output format.
The output format is based on the format used by [Supervisord](http://supervisord.org/), with timestamps in [RFC 3339](https://datatracker.ietf.org/doc/html/rfc3339) format.
* [Source on GitHub](https://github.com/borntyping/rust-simple_logger)
* [Packages on Crates.io](https://crates.io/crates/simple_logger)
* [Documentation on Docs.rs](https://docs.rs/simple_logger)
Breaking changes
----------------
- **Version 2.0.0 changes the default from displaying timestamps in the local timezone to displaying timestamps in UTC.** See issue [#52](https://github.com/borntyping/rust-simple_logger/issues/52) for more information.
Usage
-----
```rust
use simple_logger::SimpleLogger;
fn main() {
SimpleLogger::new().init().unwrap();
log::warn!("This is an example message.");
}
```
This outputs:
```txt
2022-01-19T17:27:07.013874956Z WARN [logging_example] This is an example message.
```
You can run the above example with:
```sh
cargo run --example init
```
Coloured output and timestamps will be enabled by default. You can remove these
features and their respective dependencies by disabling all features in your
`Cargo.toml`.
```toml
[dependencies.simple_logger]
default-features = false
```
To include the `timestamps` feature, but not the `colors` feature:
```toml
[dependencies.simple_logger]
default-features = false
features = ["timestamps"]
```
To include the `colors` feature, but not the `timestamps` feature:
```toml
[dependencies.simple_logger]
default-features = false
features = ["colors"]
```
To direct logging output to `stderr` use the `stderr` feature:
```toml
[dependencies.simple_logger]
features = ["stderr"]
```
This can be combined with any other feature.
Licence
-------
`simple_logger` is licenced under the [MIT Licence](http://opensource.org/licenses/MIT).
Authors
-------
Written by [Sam Clements](sam@borntyping.co.uk).