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🧰 Utils

Generics

Convert

Converts a string to a specific type while handling errors and optional defaults. It wraps conversion and fallback logic to keep your code clean and consistent.

Signature
func Convert[T any](value string, converter func(string) (T, error), defaultValue ...T) (T, error)
Example
// GET http://example.com/id/bb70ab33-d455-4a03-8d78-d3c1dacae9ff
app.Get("/id/:id", func(c fiber.Ctx) error {
fiber.Convert(c.Params("id"), uuid.Parse) // UUID(bb70ab33-d455-4a03-8d78-d3c1dacae9ff), nil
})

// GET http://example.com/search?id=65f6f54221fb90e6a6b76db7
app.Get("/search", func(c fiber.Ctx) error {
fiber.Convert(c.Query("id"), mongo.ParseObjectID) // objectid(65f6f54221fb90e6a6b76db7), nil
fiber.Convert(c.Query("id"), uuid.Parse) // uuid.Nil, error(cannot parse given uuid)
fiber.Convert(c.Query("id"), uuid.Parse, mongo.NewObjectID) // new object id generated and return nil as error.
return nil
})

// ...

GetReqHeader

Retrieves an HTTP request header as a specific type using generics.

Signature
func GetReqHeader[V GenericType](c Ctx, key string, defaultValue ...V) V
Example
app.Get("/search", func(c fiber.Ctx) error {
// curl -X GET http://example.com/search -H "X-Request-ID: 12345" -H "X-Request-Name: John"
fiber.GetReqHeader[int](c, "X-Request-ID") // => returns 12345 as integer.
fiber.GetReqHeader[string](c, "X-Request-Name") // => returns "John" as string.
fiber.GetReqHeader[string](c, "unknownParam", "default") // => returns "default" as string.
// ...
})

Locals

Reads or writes local values in the request context using generics.

Signature
// Set a value
func Locals[V any](c Ctx, key any, value ...V) V
// Get a value
func Locals[V any](c Ctx, key any) V
Example
app.Use("/user/:user/:id", func(c fiber.Ctx) error {
// set local values
fiber.Locals[string](c, "user", "john")
fiber.Locals[int](c, "id", 25)
// ...

return c.Next()
})


app.Get("/user/*", func(c fiber.Ctx) error {
// get local values
name := fiber.Locals[string](c, "user") // john
age := fiber.Locals[int](c, "id") // 25
// ...
})

Params

Retrieves route parameters as a specific type.

Signature
func Params[V GenericType](c Ctx, key string, defaultValue ...V) V
Example
app.Get("/user/:user/:id", func(c fiber.Ctx) error {
// http://example.com/user/john/25
fiber.Params[int](c, "id") // => returns 25 as integer.
fiber.Params[int](c, "unknownParam", 99) // => returns the default 99 as integer.
// ...
return c.SendString("Hello, " + fiber.Params[string](c, "user"))
})

Query

Retrieves query parameters as a specific type.

Signature
func Query[V GenericType](c Ctx, key string, defaultValue ...V) V
Example
app.Get("/search", func(c fiber.Ctx) error {
// http://example.com/search?name=john&age=25
fiber.Query[string](c, "name") // => returns "john"
fiber.Query[int](c, "age") // => returns 25 as integer.
fiber.Query[string](c, "unknownParam", "default") // => returns "default" as string.
// ...
})

RoutePatternMatch

Checks whether a given path matches a Fiber route pattern. Useful for testing patterns without registering them. Patterns may contain parameters, wildcards and optional segments. An optional Config allows control over case sensitivity and strict routing.

Signature
func RoutePatternMatch(path, pattern string, cfg ...Config) bool
Example
fiber.RoutePatternMatch("/user/john", "/user/:name") // true

fiber.RoutePatternMatch(
"/User/john",
"/user/:name",
fiber.Config{CaseSensitive: true},
) // false