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Any well written piece of code should be defensive by nature with defensive error handling understanding that things could go wrong. Things would be great if we can define our own custom error classes which we can pass or throw in order to distinguish various errors. Custom error constructors helps in: ⇒ Identifying...
Let us take a very common use-case: "There will be a registration page for users, where users will provide their required details along with their picture”. Details would be saved to MongoDB while the pictures would be uploaded to Cloudinary or S3 with user unique id." Suppose we have User Schema as given below: [js] /* * Schema...
In our node js application, sometimes we have to execute functions either synchronously or asynchronously. To achieve so , we have a node js module "async" that helps us to push down our functions in an array, so that we can execute them as per the need of the project. Installation Part: Run this command to install the "async" module...
In one of our Node.js projects, we used Mongoose module to interact with MongoDB. Mongoose provides us four types of built-in validation on schema as below: 1. Required: We can mark a field as required, which must be provided. 2. Limit: If field is type of Number in Schema, then we can restrict maximum and minimum value for that...
Many a times, we face a requirement where we need only one object of a class to communicate across the application. Singleton Pattern comes into role in this scenario. Singleton is one of my favorite Design Patterns. Singleton pattern restricts us to initialize more than one object. We implement Singleton by creating a class, having a...
