# Environment variables

There are two environment variables that affect oddlog:

• DEBUG - Decrease the minimum level of matching loggers to oddlog.DEBUG.
• TRACE - Decrease the minimum level of matching loggers to oddlog.TRACE.

Both accept the same type of patterns and are parsed by ns-matcher. Thus values might look like one of these:

# Start the app for debugging everything
env DEBUG='**' node app.js
# Start the app for debugging everything within my-app but the http logger
env DEBUG='my-app:**,!my-app:http' node app.js
# Start the app for debugging of my-app and tracing of my-app:http
env DEBUG='my-app:**' TRACE='my-app:http' node app.js

By default the level of a transport, if not explicitly set, falls back to oddlog.DEBUG. If at least one of the environment variables is set, the fallback level of transports, whose logger does not match either variable, is raised to oddlog.INFO in order to avoid noise during debugging. This has no effect, if the fallback level is already at oddlog.WARN due to the shy option.