It's 4-10x faster than other structured logging packages andsupports both structured and printf-style logging.

are possible, but require direct use ofgo.uber.org/zap/zapcore.

All methods are safefor concurrent use.Debugw logs a message with some additional context. The returned Field will safelyand explicitly represent `nil` when appropriate.L returns the global Logger, which can be reconfigured with ReplaceGlobals.It's safe for concurrent use.Infof uses fmt.Sprintf to log a templated message.Float64 constructs a field that carries a float64. Sampling caps theglobal CPU and I/O load that logging puts on your process while attemptingto preserve a representative subset of your logs.Any takes a key and an arbitrary value and chooses the best way to representthem as a field, falling back to a reflection-based approach only ifnecessary.Intp constructs a field that carries a *int. The returned Field will safelyand explicitly represent `nil` when appropriate.Sink defines the interface to write to and close logger destinations.In contexts where performance is nice, but not critical, use theSugaredLogger.

The returned Field will safelyand explicitly represent `nil` when appropriate.Int32 constructs a field with the given key and value.CombineWriteSyncers is a utility that combines multiple WriteSyncers into asingle, locked WriteSyncer. For sample code, see thepackage-level AdvancedConfiguration example.WithCaller configures the Logger to annotate each message with the filenameand line number of zap's caller, or not, depending on the value of enabled.This is a generalized form of AddCaller.Uint16p constructs a field that carries a *uint16. Quick Start In contexts where performance is nice, but not critical, use the SugaredLogger . To log UTF-8 encoded text,use ByteString.It's provided purely as a convenience; the result is no different fromusing zapcore.NewMultiWriteSyncer and zapcore.Lock individually.Package zap provides fast, structured, leveled logging.NamedError constructs a field that lazily stores err.Error() under theprovided key. The returned Field will safelyand explicitly represent `nil` when appropriate.It's perfectly safe to change the logging level while a program is running.Int8 constructs a field with the given key and value.Stringer constructs a field with the given key and the output of the value'sString method.

It's designed for library authorsto wrap in a more user-friendly API.UnmarshalText unmarshals text to a TimeEncoder."rfc3339nano" and "RFC3339Nano" are unmarshaled to RFC3339NanoTimeEncoder."rfc3339" and "RFC3339" are unmarshaled to RFC3339TimeEncoder."iso8601" and "ISO8601" are unmarshaled to ISO8601TimeEncoder."millis" is unmarshaled to EpochMillisTimeEncoder."nanos" is unmarshaled to EpochNanosEncoder.Anything else is unmarshaled to EpochTimeEncoder.Write writes the entry to the stored Cores, returns any errors, and returnsthe CheckedEntry reference to a pool for immediate re-use.
The message includes any fields passedat the log site, as well as any fields accumulated on the logger.If you don't want to use the flag package's global state, you can use anynon-nil *Level as a flag.Value with your own *flag.FlagSet.Since it's common to write logs to the local filesystem, URLs without ascheme (e.g., "/var/log/foo.log") are treated as local file paths. (See DPanicLevel for details. References are returned to a pool after Write, and MUSTNOT be retained after calling their Write method.A NameEncoder serializes a period-separated logger name to a primitivetype.AddUint64 implements ObjectEncoder.A Level is a logging priority. These presets build a loggerwith a single function call:Complex128p constructs a field that carries a *complex128. When building wrappers around theLogger and SugaredLogger, supplying this Option prevents zap from alwaysreporting the wrapper code as the caller.NewStdLog returns a *log.Logger which writes to the supplied zap Logger atInfoLevel. The Open andzapcore.Lock functions are the simplest ways to protect files with a mutex.Choosing between the Logger and SugaredLogger doesn't need to be anapplication-wide decision: converting between the two is simple andinexpensive.Fatalw logs a message with some additional context, then calls os.Exit.

Since zap already handles callerannotations, timestamps, etc., it automatically disables the standardlibrary's annotations and prefixing.Fatal logs a message at FatalLevel. For most applications, the SugaredLogger strikes abetter balance between performance and ergonomics.String returns the string representation of the underlying Level.Error uses fmt.Sprint to construct and log a message.DPanic logs a message at DPanicLevel.
For example, SugaredLoggers can produce InfoLeveloutput with Infow ("info with" structured context), Info, or Infof.By default, loggers are unbuffered. Repeated use of Hooks is additive.Infow logs a message with some additional context. Thevariadic key-value pairs are treated as they are in With.NewDevelopmentEncoderConfig returns an opinionated EncoderConfig fordevelopment environments.Float32p constructs a field that carries a *float32.

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