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Version: v2.x

📦 Fiber


This method creates a new App named instance. You can pass optional config when creating a new instance.

func New(config ...Config) *App
// Default config
app := fiber.New()

// ...


You can pass an optional Config when creating a new Fiber instance.

// Custom config
app := fiber.New(fiber.Config{
Prefork: true,
CaseSensitive: true,
StrictRouting: true,
ServerHeader: "Fiber",
AppName: "Test App v1.0.1",

// ...

Config fields

AppNamestringThis allows to setup app name for the app""
BodyLimitintSets the maximum allowed size for a request body, if the size exceeds the configured limit, it sends 413 - Request Entity Too Large response.4 * 1024 * 1024
CaseSensitiveboolWhen enabled, /Foo and /foo are different routes. When disabled, /Fooand /foo are treated the same.false
ColorSchemeColorsYou can define custom color scheme. They'll be used for startup message, route list and some middlewares.DefaultColors
CompressedFileSuffixstringAdds a suffix to the original file name and tries saving the resulting compressed file under the new file name.".fiber.gz"
ConcurrencyintMaximum number of concurrent connections.256 * 1024
DisableDefaultContentTypeboolWhen set to true, causes the default Content-Type header to be excluded from the Response.false
DisableDefaultDateboolWhen set to true causes the default date header to be excluded from the response.false
DisableHeaderNormalizingboolBy default all header names are normalized: conteNT-tYPE -> Content-Typefalse
DisableKeepaliveboolDisable keep-alive connections, the server will close incoming connections after sending the first response to the clientfalse
DisablePreParseMultipartFormboolWill not pre parse Multipart Form data if set to true. This option is useful for servers that desire to treat multipart form data as a binary blob, or choose when to parse the data.false
DisableStartupMessageboolWhen set to true, it will not print out debug informationfalse
ETagboolEnable or disable ETag header generation, since both weak and strong etags are generated using the same hashing method (CRC-32). Weak ETags are the default when enabled.false
EnableIPValidationboolIf set to true, c.IP() and c.IPs() will validate IP addresses before returning them. Also, c.IP() will return only the first valid IP rather than just the raw header value that may be a comma seperated string.

WARNING: There is a small performance cost to doing this validation. Keep disabled if speed is your only concern and your application is behind a trusted proxy that already validates this header.
EnablePrintRoutesboolEnablePrintRoutes enables print all routes with their method, path, name and handler..false
EnableSplittingOnParsersboolEnableSplittingOnParsers splits the query/body/header parameters by comma when it's true.

For example, you can use it to parse multiple values from a query parameter like this: /api?foo=bar,baz == foo[]=bar&foo[]=baz
EnableTrustedProxyCheckboolWhen set to true, fiber will check whether proxy is trusted, using TrustedProxies list.

By default c.Protocol() will get value from X-Forwarded-Proto, X-Forwarded-Protocol, X-Forwarded-Ssl or X-Url-Scheme header, c.IP() will get value from ProxyHeader header, c.Hostname() will get value from X-Forwarded-Host header.
If EnableTrustedProxyCheck is true, and RemoteIP is in the list of TrustedProxies c.Protocol(), c.IP(), and c.Hostname() will have the same behaviour when EnableTrustedProxyCheck disabled, if RemoteIP isn't in the list, c.Protocol() will return https in case when tls connection is handled by the app, or http otherwise, c.IP() will return RemoteIP() from fasthttp context, c.Hostname() will return fasthttp.Request.URI().Host()
ErrorHandlerErrorHandlerErrorHandler is executed when an error is returned from fiber.Handler. Mounted fiber error handlers are retained by the top-level app and applied on prefix associated requests.DefaultErrorHandler
GETOnlyboolRejects all non-GET requests if set to true. This option is useful as anti-DoS protection for servers accepting only GET requests. The request size is limited by ReadBufferSize if GETOnly is set.false
IdleTimeouttime.DurationThe maximum amount of time to wait for the next request when keep-alive is enabled. If IdleTimeout is zero, the value of ReadTimeout is used.nil
ImmutableboolWhen enabled, all values returned by context methods are immutable. By default, they are valid until you return from the handler; see issue #185.false
JSONDecoderutils.JSONUnmarshalAllowing for flexibility in using another json library for decoding.json.Unmarshal
JSONEncoderutils.JSONMarshalAllowing for flexibility in using another json library for encoding.json.Marshal
NetworkstringKnown networks are "tcp", "tcp4" (IPv4-only), "tcp6" (IPv6-only)

WARNING: When prefork is set to true, only "tcp4" and "tcp6" can be chosen.
PassLocalsToViewsboolPassLocalsToViews Enables passing of the locals set on a fiber.Ctx to the template engine. See our Template Middleware for supported engines.false
PreforkboolEnables use of theSO_REUSEPORTsocket option. This will spawn multiple Go processes listening on the same port. learn more about socket sharding. NOTE: if enabled, the application will need to be ran through a shell because prefork mode sets environment variables. If you're using Docker, make sure the app is ran with CMD ./app or CMD ["sh", "-c", "/app"]. For more info, see this issue comment.false
ProxyHeaderstringThis will enable c.IP() to return the value of the given header key. By default c.IP()will return the Remote IP from the TCP connection, this property can be useful if you are behind a load balancer e.g. X-Forwarded-*.""
ReadBufferSizeintper-connection buffer size for requests' reading. This also limits the maximum header size. Increase this buffer if your clients send multi-KB RequestURIs and/or multi-KB headers (for example, BIG cookies).4096
ReadTimeouttime.DurationThe amount of time allowed to read the full request, including the body. The default timeout is unlimited.nil
RequestMethods[]stringRequestMethods provides customizibility for HTTP methods. You can add/remove methods as you wish.DefaultMethods
ServerHeaderstringEnables the Server HTTP header with the given value.""
StreamRequestBodyboolStreamRequestBody enables request body streaming, and calls the handler sooner when given body is larger then the current limit.false
StrictRoutingboolWhen enabled, the router treats /foo and /foo/ as different. Otherwise, the router treats /foo and /foo/ as the same.false
TrustedProxies[]stringContains the list of trusted proxy IP's. Look at EnableTrustedProxyCheck doc.

It can take IP or IP range addresses. If it gets IP range, it iterates all possible addresses.
UnescapePathboolConverts all encoded characters in the route back before setting the path for the context, so that the routing can also work with URL encoded special charactersfalse
ViewsViewsViews is the interface that wraps the Render function. See our Template Middleware for supported engines.nil
ViewsLayoutstringViews Layout is the global layout for all template render until override on Render function. See our Template Middleware for supported engines.""
WriteBufferSizeintPer-connection buffer size for responses' writing.4096
WriteTimeouttime.DurationThe maximum duration before timing out writes of the response. The default timeout is unlimited.nil
XMLEncoderutils.XMLMarshalAllowing for flexibility in using another XML library for encoding.xml.Marshal


NewError creates a new HTTPError instance with an optional message.

func NewError(code int, message ...string) *Error
app.Get("/", func(c *fiber.Ctx) error {
return fiber.NewError(782, "Custom error message")


IsChild determines if the current process is a result of Prefork.

func IsChild() bool
// Prefork will spawn child processes
app := fiber.New(fiber.Config{
Prefork: true,

if !fiber.IsChild() {
fmt.Println("I'm the parent process")
} else {
fmt.Println("I'm a child process")

// ...