And note some fundamentals of Promise - When you create a new Promise, you're really just creating a plain old JavaScript object. This object can invoke two methods, then, and catch. Both .then() and ...
Promise object is used for handling asynchronous computations which has some important guarantees that are difficult to handle with the callback method (the more old-school method of handling ...
Ans: Node.js uses a library called libuv, to bring an asynchronous event driven model to Javscript. It piggy backs on Chrome's Javascript Engine called V8 to enable the use of Javascript's call ...
localStorage and sessionStorage both extend Storage. There is no difference between them except for the intended "non-persistence" of sessionStorage. That is, the data stored in localStorage ...
Cookie-based authentication has been the default, tried-and-true method for handling user authentication for a long time. Cookie-based authentication is stateful. This means that an authentication ...
The pipe() function reads data from a readable stream as it becomes available, and writes it to a destination writable stream. It does all "reasonable" things along the way with errors, end of files, ...
If you’ll recall, Express works with a request-response cycle in which callback functions are tied to specific routes and have access to request and response objects, like so:app.get('/', ...
The very basic steps of express-session and cookie-based session management The first time a browser makes a request to our server, express session generates a unique session id 2. saves that ...
Passport is a framework, and a Node.js middleware, that is extremely flexible and modular. It allows you to work with the main authentication strategies: Basic & Digest, OpenID, OAuth, OAuth 2.0 ...
Explanation so, basically it removes all the create and start server code from your app.js and let you focus only on the application logic part. Note: If you see in package.json file you would note ...
Since version 6.3, Node.js provides a built-in DevTools-based debugger which mostly deprecates Node Inspector, see e.g. this blog post to get started. The built-in debugger is developed directly by ...
localForage improves the offline experience of your web app by using asynchronous storage (IndexedDB or WebSQL) with a simple, localStorage-like API. Official site An important step on the path ...
First note, in a typical node app, the token is generated with jsonwebtoken npm package using jwt.sign() function in the auth.js backend route or controller. So within the router.post('/login', cb) , ...
A JSON Web Token(JWT), defines an explicit, compact, and self-containing secured protocol for transmitting restricted informations. This is often used to send information that can be verified and ...
We can speak about the graceful shutdown of our application, when all of the resources it used and all of the traffic and/or data processing what it handled are closed and released properly. It ...
Ans: First, a classic use of callback methods. Second, using Promises. Finally, in a more sophisticated way, we can use reactive extensions (RxJS) to define pipelines the manage events asynchronously ...
So you don't have to repeat same code over and over again. Node.js is a low-level I/O mechanism which has an HTTP module. If you just use an HTTP module, a lot of work like parsing the payload, ...
There are four main ways to deliver an error in Node.js:throw the error (making it an exception). pass the error to a callback, a function provided specifically for handling errors and the ...
A> https://medium.com/@alexishevia/using-cors-in-express-cac7e29b005b Cross-origin resource sharing (CORS) allows AJAX requests to skip the Same-origin policy and access resources from remote ...
The cookie parser parses cookies and puts the cookie information on req object in the middleware. It will also decrypt signed cookies provided you know the secret. Whereas The body parser parses ...
