ou may want to retrieve the Node.js version running the current process during runtime. For example, you may enforce a certain Node.js release line or at least a specified version while providing a package to the public. Node.js comes with a handy way to detect which Node. …

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JavaScript supports the BigInt data type representing whole numbers larger than the Integer rage (2^53 - 1). An app of ours has database tables using a BigInt number for primary keys. ESLint showed an issue that “BigInt is not defined” while mapping the primary key values from the database …

NPM is a powerful package manager. It supports a scripts property in the package.json file. These scripts allow you to run commands for the current project. A typical command is to run the test suite for the project. You can also combine scripts or add CLI flags to individual …

TypeScript is gaining popularity in the JavaScript ecosystem. Package authors may choose TypeScript over JavaScript to automatically create type definitions. These type definitions will then be exported with the package and be available when importing the package in another project. This tutorial shows you how to export the transpiled TypeScript …

Sometimes you need to retrieve the name of a class in JavaScript. This is helpful for debug messages or when using the class name as an identifier. Retrieving the class name in JavaScript is different for static and instance methods. This tutorial walks you through the individual method types and …

Mocha supports a variety of configuration options. A typical approach configuring Mocha is the command line. Using Mocha from the CLI or via NPM scripts lets you pass down the desired options. Mocha supports a dedicated configuration file besides the command line flags. Until Mocha v7, the supported configuration file …

Web frameworks in Node.js provide a request object containing information from the requesting instance. The request object typically includes the IP address of the requesting client. If you want to geo-locate the requesting user, the IP address is helpful. This tutorial shows you how to retrieve the client IP …