ResponseTime

Response time middleware for Fiber that measures the time spent handling a request and exposes it via a response header.

The value is the elapsed time as a Go duration string, as time.Duration.String formats it (for example 1.532ms or 2.1s), and time.ParseDuration reads it back. The clock starts when this middleware runs and stops when the rest of the chain returns, whether it returned an error or not, so register it before the middleware you want included in the measurement.

Signatures

func New(config ...Config) fiber.Handler

Examples

Import the package:

import (
    "github.com/gofiber/fiber/v3"
    "github.com/gofiber/fiber/v3/middleware/responsetime"
)

Default config

app.Use(responsetime.New())

Custom header

app.Use(responsetime.New(responsetime.Config{
    Header: "X-Elapsed",
}))

Skip logic

app.Use(responsetime.New(responsetime.Config{
    Next: func(c fiber.Ctx) bool {
        return c.Path() == "/healthz"
    },
}))

Config

Property	Type	Description	Default
Next	func(c fiber.Ctx) bool	Defines a function to skip this middleware when it returns true.	nil
Header	string	Header key used to store the measured response time. If left empty, the default header is used.	"X-Response-Time"

Default Config

var ConfigDefault = Config{
    Next:   nil,
    Header: fiber.HeaderXResponseTime,
}