Implementing JWT based Authentication for REST API in Golang with Fiber and jwt-go
Introduction
Authentication is one of the common things to be considered in building an API. Here is a simple code implementing JWT application in a webserver built with the help of fiber framework.
Installation
Go 1.18 version is used for this demo.
Clone the current repository with
git clone github.com/smc181002/jwt-with-go-fiber.git
Fiber CLI
A dev server can be started for Fiber using this CLI with live reload.
go install github.com/gofiber/cli/fiber
Package installation
Install the packages used with the commands below
go get github.com/gofiber/fiber/v2
go get github.com/golang-jwt/jwt/v4
Testing application
The user name is fixed as for this demo but in an actual application, the username will be fetched from database and the username may be replaced or combined with other parameters like roles
Using cURL
cURL is a tool installed in linux distributions by default used to fetch data from an endpoint.
Get JWT token
we can get the JWT token by POSTing to /api/auth endpoint
curl \
--data '{"name": "meher", "password": "passwd@123"}' \
-H 'Content-Type: application/json' \
http://localhost:3000/api/auth
save the output value in environmental variables from the response JSON in the above request which will be something like below
{"token":"eyJh...XVCJ9.eyJ1...4ODQ0NH0.BZZltUp...2-Urx0HUfb-I"}
To request public endpoint, we can GETting /api/posts
endpoint.
curl http://localhost:3000/api/posts/
To get the protected routes, we can send the token through Authorization Header as Bearer token
curl \
-H "Authorization: Bearer $TOKEN" \
http://localhost:3000/api/posts/private
