pl tails and pretty-prints JSONL logs produced by zap (the zap.NewProductionConfig JSON encoder, as used by go-faster/sdk).

go install github.com/go-faster/pl/cmd/pl@latest

Pipe logs in:

my-service 2>&1 | pl

Follow a file (tail -f style):

pl -f service.log

Read a file once and exit:

pl service.log

Output is colorized when stdout is a terminal. Non-JSON lines are passed through untouched, so mixed output is safe. Disable colors with --no-color or by setting NO_COLOR.

-f, --follow      follow the file, waiting for new lines (like tail -f)
    --no-color    disable ANSI colors
    --no-time     omit timestamps from the output
    --level       minimum level to display (debug|info|warn|error)
    --timezone    convert timestamps to this timezone (e.g. UTC, Local, America/New_York)

Levels render as a single colored character by default — D, I, W, E, and C for dpanic/panic/fatal:

03:00:00.099 D verbose detail
03:00:00.200 I metrics Starting attempt=3
03:00:00.299 W disk low note="needs attention"
03:00:00.400 E boom err=x
03:00:00.500 C giving up

When used as a library, override per-level label and color via Formatter.LevelStyles (levels absent from the map keep their defaults):

f := &pl.Formatter{
    Color: true,
    LevelStyles: map[zapcore.Level]pl.LevelStyle{
        zapcore.WarnLevel: {Label: "WARN", Color: "\033[33m"},
    },
}