node-google-oauth2-jwt

nodejs	express	mongodb	passport	jwt	oauth2	googleAuth

sample nodejs api with mongodb database and passportjs for authentication using passport-google-oauth20 and jwt tokens.

Prerequisites

• Obtain credentials from google. Follow these instructions if you need help

• You will also need a mongoDB database to save users. Instructions for a free mlab database

• Add google api key and mongodb uri in .env file.

touch .env

CLIENT_ID=''
CLIENT_SECRET=''
MONGO_URI=''

npm install

npm start

How it works

Use Postman or any other api testing tool for the following section.

First we are going to make a GET request to our google authentication endpoint /auth/google which will redirect the user to the google login page. After google successfully authenticates the user it will redirect to our callback endpoint with the user's profile information such as googleId, email etc... now we can save the user in the database or retrieve existing user info and redirect to our auth-success endpoint /auth-success where we issue a jwt token.

We can verify the token validity by making a GET request to the /verify endpoint. Don't forget to add the attach the authorization header to the request.

Useful beginner resources

mongoDB youtube tutorial

mongoose docs

passportjs-google-oauth2-strategy youtube tutorial

passport-jwt youtube tutorial