< 1 min readTo parse a JSON string in Node.js, you can use the JSON.parse() function. This function takes a JSON string as an argument and returns a JavaScript object or array constructed from the JSON string. Here’s an example of how to parse a JSON string: In this example, we parse a JSON string that represents an…
2 min readTo create a directory in Node.js, you can use the fs (file system) module and the fs.mkdir() function. This function takes a path and an optional options object, and creates the directory at the specified path. Here’s an example of how to create a directory if it doesn’t exist: In this example, we first check…
< 1 min readWhen installing a package using npm (the package manager for Node.js), you can use the –save flag to add the package to your project’s dependencies in the package.json file. This indicates that the package is required for your project to run and should be installed when running npm install. On the other hand, the –save-dev…
< 1 min readTo Base64-encode a string in Node.js, you can use the Buffer class and its .toString() method. Here’s an example: You can also use the Buffer.from() method to decode a Base64-encoded string: Alternatively, you can use the built-in Buffer global and the .toString() method to achieve the same results: Note: The Buffer class was designed to…
< 1 min readTo uninstall an npm module in Node.js, you can use the uninstall command of the npm CLI (Command Line Interface). The uninstall command takes the name of the module that you want to uninstall as an argument. For example: This will uninstall the express module from your Node.js project. You can also use the -S…
< 1 min readTo read environment variables in Node.js, you can use the process.env object. The process.env object contains a property for each of the environment variables that are available to the Node.js process. You can access the value of an environment variable using dot notation or bracket notation. Here’s an example of how you can read an…
< 1 min readTo get the GET query parameters in an Express.js server, you can use the query property of the request object. Here’s an example of how you can get the GET query parameters in an Express.js server using the query property: In this example, the query property of the request object contains the GET query parameters…
< 1 min readmodule.exports is a special object in Node.js that is used to expose objects, functions, or variables to the module system. It allows you to reuse code in your application by breaking it down into smaller, modular units called “modules”. To use module.exports, you can assign the object, function, or variable that you want to expose…
< 1 min readThe process.argv property returns an array containing the command-line arguments passed when the Node.js process was launched. The first element will be process.execPath. See process.argv0 if access to the original value of argv[0] is needed. The second element will be the path to the JavaScript file being executed. The remaining elements will be any additional…
< 1 min readThe –save option for npm install is used to save the installed package as a dependency in the package.json file of the project. By default, npm install installs a package in the local node_modules directory, but does not update the dependencies section of the package.json file. This means that the installed package will not be…
