# Logfmt Encoder
This package implements logfmt for
[zap](https://github.com/uber-go/zap).
## Usage
The encoder is simple to use.
```go
package main
import (
"os"
"github.com/jsternberg/zap-logfmt"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
func main() {
config := zap.NewProductionEncoderConfig()
logger := zap.New(zapcore.NewCore(
zaplogfmt.NewEncoder(config),
os.Stdout,
zapcore.DebugLevel,
))
logger.Info("Hello World")
}
```
To use RFC3339 output for the time instead of an integer timestamp, you
can do this:
```go
package main
import (
"os"
"github.com/jsternberg/zap-logfmt"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
)
func main() {
config := zap.NewProductionEncoderConfig()
config.EncodeTime = func(ts time.Time, encoder zapcore.PrimitiveArrayEncoder) {
encoder.AppendString(ts.UTC().Format(time.RFC3339))
}
logger := zap.New(zapcore.NewCore(
zaplogfmt.NewEncoder(config),
os.Stdout,
zapcore.DebugLevel,
))
logger.Info("Hello World")
}
```
## Limitations
It is not possible to log an array, channel, function, map, slice, or
struct. Functions and channels since they don't really have a suitable
representation to begin with. Logfmt does not have a method of
outputting arrays or maps so arrays, slices, maps, and structs cannot be
rendered.
## Namespaces
Namespaces are supported. If a namespace is opened, all of the keys will
be prepended with the namespace name. For example, with the namespace
`foo` and the key `bar`, you would get a key of `foo.bar`.