🧠 Context

The Ctx struct represents the Context which hold the HTTP request and response. It has methods for the request query string, parameters, body, HTTP headers and so on.

Accepts

Checks, if the specified extensions or content types are acceptable.

Based on the request’s Accept HTTP header.

Signature
c.Accepts(types ...string) string
c.AcceptsCharsets(charsets ...string) string
c.AcceptsEncodings(encodings ...string) string
c.AcceptsLanguages(langs ...string) string
Example
// Accept: text/*, application/json
app.Get("/", func(c *fiber.Ctx) {
c.Accepts("html") // "html"
c.Accepts("text/html") // "text/html"
c.Accepts("json", "text") // "json"
c.Accepts("application/json") // "application/json"
c.Accepts("image/png") // ""
c.Accepts("png") // ""
})

Fiber provides similar functions for the other accept headers.

// Accept-Charset: utf-8, iso-8859-1;q=0.2
// Accept-Encoding: gzip, compress;q=0.2
// Accept-Language: en;q=0.8, nl, ru
app.Get("/", func(c *fiber.Ctx) {
c.AcceptsCharsets("utf-16", "iso-8859-1")
// "iso-8859-1"
c.AcceptsEncodings("compress", "br")
// "compress"
c.AcceptsLanguages("pt", "nl", "ru")
// "nl"
})

Append

Appends the specified value to the HTTP response header field.

If the header is not already set, it creates the header with the specified value.

Signature
c.Append(field, values ...string)
Example
app.Get("/", func(c *fiber.Ctx) {
c.Append("Link", "http://google.com", "http://localhost")
// => Link: http://localhost, http://google.com
c.Append("Link", "Test")
// => Link: http://localhost, http://google.com, Test
})

Attachment

Sets the HTTP response Content-Disposition header field to attachment.

Signature
c.Attachment(file ...string)
Example
app.Get("/", func(c *fiber.Ctx) {
c.Attachment()
// => Content-Disposition: attachment
c.Attachment("./upload/images/logo.png")
// => Content-Disposition: attachment; filename="logo.png"
// => Content-Type: image/png
})

BaseURL

Returns base URL (protocol + host) as a string.

Signature
c.BaseURL() string
Example
// GET https://example.com/page#chapter-1
app.Get("/", func(c *fiber.Ctx) {
c.BaseURL() // https://example.com
})

Body

Contains the raw body submitted in a POST request.

Signature
c.Body() string
Example
// curl -X POST http://localhost:8080 -d user=john
app.Post("/", func(c *fiber.Ctx) {
// Get raw body from POST request:
c.Body() // user=john
})

Returned value is only valid within the handler. Do not store any references. Make copies or use the Immutable setting instead. Read more...

BodyParser

Binds the request body to a struct. BodyParser supports decoding query parameters and the following content types based on the Content-Type header:

  • application/json

  • application/xml

  • application/x-www-form-urlencoded

  • multipart/form-data

Signature
c.BodyParser(out interface{}) error
Example
// Field names should start with an uppercase letter
type Person struct {
Name string `json:"name" xml:"name" form:"name" query:"name"`
Pass string `json:"pass" xml:"pass" form:"pass" query:"pass"`
}
app.Post("/", func(c *fiber.Ctx) {
p := new(Person)
if err := c.BodyParser(p); err != nil {
log.Fatal(err)
}
log.Println(p.Name) // john
log.Println(p.Pass) // doe
})
// Run tests with the following curl commands
// curl -X POST -H "Content-Type: application/json" --data "{\"name\":\"john\",\"pass\":\"doe\"}" localhost:3000
// curl -X POST -H "Content-Type: application/xml" --data "<login><name>john</name><pass>doe</pass></login>" localhost:3000
// curl -X POST -H "Content-Type: application/x-www-form-urlencoded" --data "name=john&pass=doe" localhost:3000
// curl -X POST -F name=john -F pass=doe http://localhost:3000
// curl -X POST "http://localhost:3000/?name=john&pass=doe"

ClearCookie

Expire a client cookie (or all cookies if left empty)

Signature
c.ClearCookie(key ...string)
Example
app.Get("/", func(c *fiber.Ctx) {
// Clears all cookies:
c.ClearCookie()
// Expire specific cookie by name:
c.ClearCookie("user")
// Expire multiple cookies by names:
c.ClearCookie("token", "session", "track_id", "version")
})

Context

Returns context.Context that carries a deadline, a cancellation signal, and other values across API boundaries. Signature

c.Context() context.Context

Cookie

Set cookie

Signature

c.Cookie(*Cookie)
type Cookie struct {
Name string
Value string
Path string
Domain string
Expires time.Time
Secure bool
HTTPOnly bool
SameSite string // lax, strict, none
}
Example
app.Get("/", func(c *fiber.Ctx) {
// Create cookie
cookie := new(fiber.Cookie)
cookie.Name = "john"
cookie.Value = "doe"
cookie.Expires = time.Now().Add(24 * time.Hour)
// Set cookie
c.Cookie(cookie)
})

Cookies

Get cookie value by key.

Signatures

c.Cookies(key string) string
Example
app.Get("/", func(c *fiber.Ctx) {
// Get cookie by key:
c.Cookies("name") // "john"
})

Returned value is only valid within the handler. Do not store any references. Make copies or use the Immutable setting instead. Read more...

Download

Transfers the file from path as an attachment.

Typically, browsers will prompt the user for download. By default, the Content-Disposition header filename= parameter is the file path (this typically appears in the browser dialog).

Override this default with the filename parameter.

Signature
c.Download(path, filename ...string)
Example
app.Get("/", func(c *fiber.Ctx) {
c.Download("./files/report-12345.pdf")
// => Download report-12345.pdf
c.Download("./files/report-12345.pdf", "report.pdf")
// => Download report.pdf
})

Fasthttp

You can still access and use all Fasthttp methods and properties.

Signature

Please read the Fasthttp Documentation for more information.

Example

app.Get("/", func(c *fiber.Ctx) {
c.Fasthttp.Request.Header.Method()
// => []byte("GET")
c.Fasthttp.Response.Write([]byte("Hello, World!"))
// => "Hello, World!"
})

Error

This contains the error information that thrown by a panic or passed via the Next(err) method.

Signature
c.Error() error
Example
func main() {
app := fiber.New()
app.Post("/api/register", func (c *fiber.Ctx) {
if err := c.JSON(&User); err != nil {
c.Next(err)
}
})
app.Get("/api/user", func (c *fiber.Ctx) {
if err := c.JSON(&User); err != nil {
c.Next(err)
}
})
app.Put("/api/update", func (c *fiber.Ctx) {
if err := c.JSON(&User); err != nil {
c.Next(err)
}
})
app.Use("/api", func(c *fiber.Ctx) {
c.Set("Content-Type", "application/json")
c.Status(500).Send(c.Error())
})
app.Listen(1337)
}

Format

Performs content-negotiation on the Accept HTTP header. It uses Accepts to select a proper format.

If the header is not specified or there is no proper format, text/plain is used.

Signature
c.Format(body interface{})
Example
app.Get("/", func(c *fiber.Ctx) {
// Accept: text/plain
c.Format("Hello, World!")
// => Hello, World!
// Accept: text/html
c.Format("Hello, World!")
// => <p>Hello, World!</p>
// Accept: application/json
c.Format("Hello, World!")
// => "Hello, World!"
})

FormFile

MultipartForm files can be retrieved by name, the first file from the given key is returned.

Signature
c.FormFile(name string) (*multipart.FileHeader, error)
Example
app.Post("/", func(c *fiber.Ctx) {
// Get first file from form field "document":
file, err := c.FormFile("document")
// Check for errors:
if err == nil {
// Save file to root directory:
c.SaveFile(file, fmt.Sprintf("./%s", file.Filename))
}
})

FormValue

Any form values can be retrieved by name, the first value from the given key is returned.

Signature
c.FormValue(name string) string
Example
app.Post("/", func(c *fiber.Ctx) {
// Get first value from form field "name":
c.FormValue("name")
// => "john" or "" if not exist
})

Returned value is only valid within the handler. Do not store any references. Make copies or use the Immutable setting instead. Read more...

Fresh

https://expressjs.com/en/4x/api.html#req.fresh

Not implemented yet, pull requests are welcome!

Get

Returns the HTTP request header specified by field.

The match is case-insensitive.

Signature
c.Get(field string) string
Example
app.Get("/", func(c *fiber.Ctx) {
c.Get("Content-Type") // "text/plain"
c.Get("CoNtEnT-TypE") // "text/plain"
c.Get("something") // ""
})

Returned value is only valid within the handler. Do not store any references. Make copies or use the Immutable setting instead. Read more...

Hostname

Contains the hostname derived from the Host HTTP header.

Signature
c.Hostname() string
Example
// GET http://google.com/search
app.Get("/", func(c *fiber.Ctx) {
c.Hostname() // "google.com"
})

Returned value is only valid within the handler. Do not store any references. Make copies or use the Immutable setting instead. Read more...

IP

Returns the remote IP address of the request.

Signature
c.IP() string
Example
app.Get("/", func(c *fiber.Ctx) {
c.IP() // "127.0.0.1"
})

IPs

Returns an array of IP addresses specified in the X-Forwarded-For request header.

Signature
c.IPs() []string
Example
// X-Forwarded-For: proxy1, 127.0.0.1, proxy3
app.Get("/", func(c *fiber.Ctx) {
c.IPs() // ["proxy1", "127.0.0.1", "proxy3"]
})

Is

Returns the matching content type, if the incoming request’s Content-Type HTTP header field matches the MIME type specified by the type parameter.

If the request has no body, it returns false.

Signature
c.Is(t string) bool
Example
// Content-Type: text/html; charset=utf-8
app.Get("/", func(c *fiber.Ctx) {
c.Is("html") // true
c.Is(".html") // true
c.Is("json") // false
})

JSON

Converts any interface or string to JSON using Jsoniter.

JSON also sets the content header to application/json.

Signature
c.JSON(v interface{}) error
Example
type SomeStruct struct {
Name string
Age uint8
}
app.Get("/json", func(c *fiber.Ctx) {
// Create data struct:
data := SomeStruct{
Name: "Grame",
Age: 20,
}
if err := c.JSON(data); err != nil {
c.Status(500).Send(err)
return
}
// => Content-Type: application/json
// => "{"Name": "Grame", "Age": 20}"
if err := c.JSON(fiber.Map{
"name": "Grame",
"age": 20,
}); err != nil {
c.Status(500).Send(err)
return
}
// => Content-Type: application/json
// => "{"name": "Grame", "age": 20}"
})

JSONP

Sends a JSON response with JSONP support. This method is identical to JSON, except that it opts-in to JSONP callback support. By default, the callback name is simply callback.

Override this by passing a named string in the method.

Signature
c.JSONP(v interface{}, callback ...string) error
Example
type SomeStruct struct {
name string
age uint8
}
app.Get("/", func(c *fiber.Ctx) {
// Create data struct:
data := SomeStruct{
name: "Grame",
age: 20,
}
c.JSONP(data)
// => callback({"name": "Grame", "age": 20})
c.JSONP(data, "customFunc")
// => customFunc({"name": "Grame", "age": 20})
})

Links

Joins the links followed by the property to populate the response’s Link HTTP header field.

Signature
c.Links(link ...string)
Example
app.Get("/", func(c *fiber.Ctx) {
c.Link(
"http://api.example.com/users?page=2", "next",
"http://api.example.com/users?page=5", "last",
)
// Link: <http://api.example.com/users?page=2>; rel="next",
// <http://api.example.com/users?page=5>; rel="last"
})

Locals

Method that stores string variables scoped to the request and therefore available only to the routes that match the request.

This is useful, if you want to pass some specific data to the next middleware.

Signature
c.Locals(key string, value ...interface{}) interface{}
Example
app.Get("/", func(c *fiber.Ctx) {
c.Locals("user", "admin")
c.Next()
})
app.Get("/admin", func(c *fiber.Ctx) {
if c.Locals("user") == "admin" {
c.Status(200).Send("Welcome, admin!")
} else {
c.SendStatus(403)
// => 403 Forbidden
}
})

Location

Sets the response Location HTTP header to the specified path parameter.

Signature
c.Location(path string)
Example
app.Post("/", func(c *fiber.Ctx) {
c.Location("http://example.com")
c.Location("/foo/bar")
})

Method

Contains a string corresponding to the HTTP method of the request: GET, POST, PUT and so on. Optionally, you could override the method by passing a string.

Signature
c.Method(override ...string) string
Example
app.Post("/", func(c *fiber.Ctx) {
c.Method() // "POST"
})

MultipartForm

To access multipart form entries, you can parse the binary with MultipartForm(). This returns a map[string][]string, so given a key the value will be a string slice.

Signature
c.MultipartForm() (*multipart.Form, error)
Example
app.Post("/", func(c *fiber.Ctx) {
// Parse the multipart form:
if form, err := c.MultipartForm(); err == nil {
// => *multipart.Form
if token := form.Value["token"]; len(token) > 0 {
// Get key value:
fmt.Println(token[0])
}
// Get all files from "documents" key:
files := form.File["documents"]
// => []*multipart.FileHeader
// Loop through files:
for _, file := range files {
fmt.Println(file.Filename, file.Size, file.Header["Content-Type"][0])
// => "tutorial.pdf" 360641 "application/pdf"
// Save the files to disk:
c.SaveFile(file, fmt.Sprintf("./%s", file.Filename))
}
}
})

Next

When Next is called, it executes the next method in the stack that matches the current route. You can pass an error struct within the method for custom error handling.

Signature
c.Next(err ...error)
Example
app.Get("/", func(c *fiber.Ctx) {
fmt.Println("1st route!")
c.Next()
})
app.Get("*", func(c *fiber.Ctx) {
fmt.Println("2nd route!")
c.Next(fmt.Errorf("Some error"))
})
app.Get("/", func(c *fiber.Ctx) {
fmt.Println(c.Error()) // => "Some error"
fmt.Println("3rd route!")
c.Send("Hello, World!")
})

OriginalURL

Contains the original request URL.

Signature
c.OriginalURL() string
Example
// GET http://example.com/search?q=something
app.Get("/", func(c *fiber.Ctx) {
c.OriginalURL() // "/search?q=something"
})

Returned value is only valid within the handler. Do not store any references. Make copies or use the Immutable setting instead. Read more...

Params

Method can be used to get the route parameters.

Defaults to empty string (""), if the param doesn't exist.

Signature
c.Params(param string) string
Example
// GET http://example.com/user/fenny
app.Get("/user/:name", func(c *fiber.Ctx) {
c.Params("name") // "fenny"
})

Returned value is only valid within the handler. Do not store any references. Make copies or use the Immutable setting instead. Read more...__

Path

Contains the path part of the request URL. Optionally, you could override the path by passing a string.

Signature
c.Path(override ...string) string
Example
// GET http://example.com/users?sort=desc
app.Get("/users", func(c *fiber.Ctx) {
c.Path() // "/users"
})

Protocol

Contains the request protocol string: http or https for TLS requests.

Signature
c.Protocol() string
Example
// GET http://example.com
app.Get("/", func(c *fiber.Ctx) {
c.Protocol() // "http"
})

Query

This property is an object containing a property for each query string parameter in the route.

If there is no query string, it returns an empty string.

Signature
c.Query(parameter string) string
Example
// GET http://example.com/shoes?order=desc&brand=nike
app.Get("/", func(c *fiber.Ctx) {
c.Query("order") // "desc"
c.Query("brand") // "nike"
})

Returned value is only valid within the handler. Do not store any references. Make copies or use the Immutable setting instead. Read more...

Range

An struct containg the type and a slice of ranges will be returned.

Signature
c.Range(int size)
Example
// Range: bytes=500-700, 700-900
app.Get("/", func(c *fiber.Ctx) {
b := c.Range(1000)
if b.Type == "bytes" {
for r := range r.Ranges {
fmt.Println(r)
// [500, 700]
}
}
})

Redirect

Redirects to the URL derived from the specified path, with specified status, a positive integer that corresponds to an HTTP status code.

If not specified, status defaults to 302 Found.

Signature
c.Redirect(path string, status ...int)
Example
app.Get("/", func(c *fiber.Ctx) {
c.Redirect("/foo/bar")
c.Redirect("../login")
c.Redirect("http://example.com")
c.Redirect("http://example.com", 301)
})

Render

Renders a template with data and sends a text/html response. By default Render uses the default Go Template engine. If you want to use another engine, please take a look at our Template middleware.

Signature
c.Render(file string, data interface{}) error

Route

Contains the matched Route struct.

Signature
c.Route() *Route
Example
// http://localhost:8080/hello
app.Get("/hello", func(c *fiber.Ctx) {
r := c.Route()
fmt.Println(r.Method, r.Path, r.Params, r.Regexp, r.Handler)
})
app.Post("/:api?", func(c *fiber.Ctx) {
c.Route()
// => {GET /hello [] nil 0x7b49e0}
})

SaveFile

Method is used to save any multipart file to disk.

Signature
c.SaveFile(fh *multipart.FileHeader, path string)
Example
app.Post("/", func(c *fiber.Ctx) {
// Parse the multipart form:
if form, err := c.MultipartForm(); err == nil {
// => *multipart.Form
// Get all files from "documents" key:
files := form.File["documents"]
// => []*multipart.FileHeader
// Loop through files:
for _, file := range files {
fmt.Println(file.Filename, file.Size, file.Header["Content-Type"][0])
// => "tutorial.pdf" 360641 "application/pdf"
// Save the files to disk:
c.SaveFile(file, fmt.Sprintf("./%s", file.Filename))
}
}
})

Secure

A boolean property, that is true , if a TLS connection is established.

Signature
c.Secure() bool
Example
// Secure() method is equivalent to:
c.Protocol() == "https"

Send

Sets the HTTP response body. The Send body can be of any type.

Send doesn't append like the Write method.

Signature
c.Send(body ...interface{})
Example
app.Get("/", func(c *fiber.Ctx) {
c.Send("Hello, World!") // => "Hello, World!"
c.Send([]byte("Hello, World!")) // => "Hello, World!"
c.Send(123) // => 123
})

Fiber also provides SendBytes ,SendString and SendStream methods for raw inputs.

Use this, if you don't need type assertion, recommended for faster performance.

Signature
c.SendBytes(b []byte)
c.SendString(s string)
c.SendStream(r io.Reader, s ...int)
Example
app.Get("/", func(c *fiber.Ctx) {
c.SendByte([]byte("Hello, World!"))
// => "Hello, World!"
c.SendString("Hello, World!")
// => "Hello, World!"
c.SendStream(bytes.NewReader([]byte("Hello, World!")))
// => "Hello, World!"
})

SendFile

Transfers the file from the given path. Sets the Content-Type response HTTP header field based on the filenames extension.

Method use gzipping by default, set it to true to disable.

Signature
c.SendFile(path string, gzip ...bool)
Example
app.Get("/not-found", func(c *fiber.Ctx) {
c.SendFile("./public/404.html")
// Disable gzipping:
c.SendFile("./static/index.html", true)
})

SendStatus

Sets the status code and the correct status message in the body, if the response body is empty.

You can find all used status codes and messages here.

Signature
c.SendStatus(status int)
Example
app.Get("/not-found", func(c *fiber.Ctx) {
c.SendStatus(415)
// => 415 "Unsupported Media Type"
c.Send("Hello, World!")
c.SendStatus(415)
// => 415 "Hello, World!"
})

Set

Sets the response’s HTTP header field to the specified key, value.

Signature
c.Set(field, value string)
Example
app.Get("/", func(c *fiber.Ctx) {
c.Set("Content-Type", "text/plain")
// => "Content-type: text/plain"
})

Stale

https://expressjs.com/en/4x/api.html#req.fresh

Not implemented yet, pull requests are welcome!

Status

Sets the HTTP status for the response.

Method is a chainable.

Signature
c.Status(status int)
Example
app.Get("/", func(c *fiber.Ctx) {
c.Status(200)
c.Status(400).Send("Bad Request")
c.Status(404).SendFile("./public/gopher.png")
})

Subdomains

An array of subdomains in the domain name of the request.

The application property subdomain offset, which defaults to 2, is used for determining the beginning of the subdomain segments.

Signature
c.Subdomains(offset ...int) []string
Example
// Host: "tobi.ferrets.example.com"
app.Get("/", func(c *fiber.Ctx) {
c.Subdomains() // ["ferrets", "tobi"]
c.Subdomains(1) // ["tobi"]
})

Type

Sets the Content-Type HTTP header to the MIME type listed here specified by the file extension.

Signature
c.Type(t string) string
Example
app.Get("/", func(c *fiber.Ctx) {
c.Type(".html") // => "text/html"
c.Type("html") // => "text/html"
c.Type("json") // => "application/json"
c.Type("png") // => "image/png"
})

Vary

Adds the given header field to the Vary response header. This will append the header, if not already listed, otherwise leaves it listed in the current location.

Multiple fields are allowed.

Signature
c.Vary(field ...string)
Example
app.Get("/", func(c *fiber.Ctx) {
c.Vary("Origin") // => Vary: Origin
c.Vary("User-Agent") // => Vary: Origin, User-Agent
// No duplicates
c.Vary("Origin") // => Vary: Origin, User-Agent
c.Vary("Accept-Encoding", "Accept")
// => Vary: Origin, User-Agent, Accept-Encoding, Accept
})

Write

Appends any input to the HTTP body response.

Signature
c.Write(body ...interface{})
Example
app.Get("/", func(c *fiber.Ctx) {
c.Write("Hello, ") // => "Hello, "
c.Write([]byte("World! ")) // => "Hello, World! "
c.Write(123) // => "Hello, World! 123"
})

XHR

A Boolean property, that is true, if the request’s X-Requested-With header field is XMLHttpRequest, indicating that the request was issued by a client library (such as jQuery).

Signature
c.XHR() bool
Example
// X-Requested-With: XMLHttpRequest
app.Get("/", func(c *fiber.Ctx) {
c.XHR() // true
})