Format reference

• Message context:
  • %Level - log level (Trace, Debug, Info, Warn, Error, Critical)
  • %Lev - short log level (Trc, Dbg, Inf, Wrn, Err, Crt)
  • %LEVEL - capitalized log level (TRACE, DEBUG, INFO, WARN, ERROR, CRITICAL)
  • %LEV - short capitalized log level (TRC, DBG, INF, WRN, ERR, CRT)
  • %l - super compact log level (t, d, i, w, e, c)
  • %Msg - message text (string)
  • %FullPath - full caller file path
  • %File - caller filename only
  • %RelFile - caller path relative to the application runtime directory
  • %Func - caller function name
  • %FuncShort - caller function name part after the last dot
  • %Line - line number where logger was called
• Date and time
  • %Ns - time.Now().UnixNano()
  • %Date - shortcut for ‘2006-01-02’
  • %Time - shortcut for ‘15:04:05’
  • %Date(...) - date with format, specified in parentheses. Uses standard time.Format, so check http://golang.org/src/pkg/time/format.go for identifiers list. Use it like that: "%Date(2006-01-02)" (or any other format)
  • %UTCNs - time.Now().UTC().UnixNano()
  • %UTCDate - shortcut for ‘2006-01-02’ (UTC)
  • %UTCTime - shortcut for ‘15:04:05’ (UTC)
  • %UTCDate(...) - UTC date with format, specified in parentheses. Uses standard time.Format, so check http://golang.org/src/pkg/time/format.go for identifiers list. Use it like that: "%UTCDate(2006-01-02)" (or any other format)
• Special symbols
  • %EscN - terminal ANSI CSI n [;k] m escape. Check Colored output for details
  • %n - newline
  • %t - tab

Predefined formats

Full name of a format identifier consists of the prefix std: and one of the identifiers listed below. Here is a full list of id-format pairs:

• xml-debug: <time>%Ns</time><lev>%Lev</lev><msg>%Msg</msg><path>%RelFile</path><func>%Func</func>
• xml-debug-short: <t>%Ns</t><l>%l</l><m>%Msg</m><p>%RelFile</p><f>%Func</f>
• xml: <time>%Ns</time><lev>%Lev</lev><msg>%Msg</msg>
• xml-short: <t>%Ns</t><l>%l</l><m>%Msg</m>
• json-debug: {"time":%Ns,"lev":"%Lev","msg":"%Msg","path":"%RelFile","func":"%Func"}
• json-debug-short: {"t":%Ns,"l":"%Lev","m":"%Msg","p":"%RelFile","f":"%Func"}
• json: {"time":%Ns,"lev":"%Lev","msg":"%Msg"}
• json-short: {"t":%Ns,"l":"%Lev","m":"%Msg"}
• debug: [%LEVEL] %RelFile:%Func %Date %Time %Msg%n
• debug-short: [%LEVEL] %Date %Time %Msg%n
• fast: %Ns %l %Msg%n