logfmt 🪵

Pipe logs and get formatted, colorized, filterable terminal output.
Supports JSON and logfmt (key=value) style logs. Falls back gracefully for plain text.

Install

go install github.com/dominionthedev/logfmt@latest

Or download a prebuilt binary from the releases page

• With Eget:

eget dominionthedev/logfmt

Usage

Note

Some Flags doesn't work, and some logs don't get formatted This will be fixed in the next

# Basic — pipe anything in
tail -f app.log | logfmt

# Filter to warn and above
cat app.log | logfmt --level warn

# Only show lines matching a string
kubectl logs my-pod | logfmt --filter "user_id=42"

# Hide KV pairs, show time + level + message only
cat app.log | logfmt --time-only

# Combine
tail -f app.log | logfmt --level error --filter "database"

Flags

Flag	Short	Description
--filter	-f	Only show lines containing this string (case-insensitive)
--level	-l	Minimum level: debug, info, warn, error, fatal
--time-only	-t	Hide KV pairs, show time + level + message only
--no-color		Disable color output

Supported formats

• JSON — detects { prefix, reads common keys (level, msg, time, etc.)
• logfmt — parses key=value and key="quoted value" pairs
• Plain text — rendered as-is in muted style

Level colors

Level	Color
DEBUG	Blue
INFO	Green
WARN	Amber
ERROR	Red
FATAL	Red + underline