Nodemon: For restarting the development server automatically whenever any change is done.For providing a schema-based solution to your application data. Mongoose: MongoDB object-relational model.Redis: For creating a Redis client on the application.Express-session: For handling sessions in the application.Express: For setting up the application’s HTTP server.EJS: For rendering the views(templates).Connect-redis: For connecting to the Redis server from the application.Bcrypt: For encrypting and decrypting passwords.We will use the following third-party packages throughout the article: Open the command line from your working directory and run the following command to initialize the application with default Node.js configurations. Saving a session on the client means higher CPU usage is required to ensure the safe transfer of data, and this is not the case when using an in-memory database such as Redis.You don’t need to manually encrypt any keys for the Redis session, and Redis will handle this for you.You can log out of the current browser session anytime using the Redis session cache. Redis makes a good choice to save the session on the server side. Due to security reasons, it is not advisable to save session IDs in the browser.Reasons for using Redis storage in this use case include the following: We will use Redis as an in-memory data store to save sessions. Redis is an in-memory database that can store and persist multiple data formats. Unlike the session, a cookie doesn’t store any user credentials. The difference between a cookie and a session is that a cookie is saved on the client/browser while the session is saved o the server. The server will then check if the cookie value matches the session stored value. This way, the request will be sent along with the value of this cookie. A cookie value is saved on the client’s browser when a session is created. This is made possible by allowing the server to create a session ID. This way, the browser keeps session variables with the information of the previous request made to the server. It helps to keep track of the state between the server(web app) and the client (browser). Session variables are used to store user information to be used across the web application. Sessions are used to make the HTTP server stateful. This means each request your browser makes is unaware of the actions of the previous requests. This is because HTTP servers are stateless and don’t store user information they only get requests from the user and send back a response. An HTTP server does not know you and the time you spend interacting with the server. However, in HTTP web servers, things are a bit different. When using an application, the computer knows who you are and how much time you spend using that application. We will use the MongoDB database to store the user credentials.Įnsure your MongoDB and Redis servers are up and running before we dive in and create the application. We will use Redis to store the user session. Redis server installed on your computer.To continue with this article, it is helpful to have the following: To understand how Node uses sessions, we will build session-based authentication and use sessions to hold the authenticated user’s data using Redis and MongoDB.
#Session node how to
This guide will help you understand how to use sessions in Node. A session helps you store HTTP data to be used across multiple pages on a website. One of the best ways to save such data is by using sessions. However, circumstances may force you to build a stateful server to save data between the client and server sides. Stateless means they do not store any data. editor.HTTP requests are considered stateless protocols and are used to transmit data between the server and the browser.
The REPL knows when you are typing a multi-line statement without the need to invoke. exit: exits the repl (same as pressing ctrl-C two times) save: saves all you entered in the REPL session to a file (specify the filename) load: loads a JavaScript file, relative to the current working directory clear: resets the REPL context to an empty object and clears any multi-line expression currently being input. break: when inputting a multi-line expression, entering the.
#Session node code
Once you are in this mode, enter ctrl-D to run the code you wrote. editor: enables editor mode, to write multiline JavaScript code with ease. The REPL has some special commands, all starting with a dot. If you press the up arrow key, you will get access to the history of the previous lines of code executed in the current, and even previous REPL sessions. If after some code you type _, that is going to print the result of the last operation.
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