Request Logger

RequestLogger logs request and response details after the handler chain completes.

Quick start

app.Use(middleware.RequestLogger())

Zinc also exposes Logger() and LoggerWithConfig(...) as aliases.

Default fields

With the default config, Zinc logs:

• latency
• method
• URI
• status
• error
• remote IP
• host
• user agent
• request ID
• content length
• response size

Config fields

Field	Meaning
Skipper	Skip logging for selected requests
BeforeNextFunc	Hook that runs before the rest of the chain
LogValuesFunc	Receive extracted values and emit logs yourself
HandleError	Route returned errors through Zinc before logging
Logger	Custom slog.Logger for the default logger
LogLatency	Include request duration
LogMethod	Include request method
LogURI	Include request URI
LogRoutePath	Include matched route path
LogStatus	Include response status
LogError	Include request error
LogRemoteIP	Include remote IP
LogHost	Include host
LogUserAgent	Include user agent
LogRequestID	Include request ID
LogContentLength	Include request body size from headers
LogResponseSize	Include response bytes written
LogHeaders	Capture selected request headers
LogQueryParams	Capture selected query parameters

Custom logger example

app.Use(middleware.RequestLoggerWithConfig(middleware.RequestLoggerConfig{
  LogRoutePath: true,
  LogHeaders:   []string{"X-Request-ID", "X-Forwarded-For"},
  LogValuesFunc: func(c *zinc.Context, v middleware.RequestLoggerValues) error {
    slog.Info("http",
      "method", v.Method,
      "route", v.RoutePath,
      "status", v.Status,
      "latency", v.Latency,
    )
    return nil
  },
}))

When to use BeforeNextFunc

Use it when you need to stamp context, start tracing spans, or derive correlation values before the rest of the middleware stack runs.