nodejs tagged requests and articles
Categorized request examples and articles tagged with [nodejs] keyword How to Use Fetch API in Node.js?
To send HTTP requests using the Node.js Fetch API, you need Node.js v18 or higher. Like the browser version, the Node.js Fetch API is promise-based and works perfectly with async/await structures. The global fetch() method takes two parameters: the URI of the resource you want to fetch and an optional "options" parameter that provides additional parameters for the request. Using the "options" parameter, you can pass the HTTP method, additional HTTP headers, POST data, and request credentials. The fetch() method returns a promise, which resolves to a Response object. You can obtain the response in JSON format by calling response.json(), or as plain text by calling response.text(). In this Node.js Fetch Example, we make a request to the ReqBin echo URL using the fetch() method. Click Execute to run the Node.js Fetch Example online and see the result.
How to Read a JSON File in Node.js?
To read a JSON file in Node.js, you can use the built-in fs (file system) module as you would to read any text file and then use the JSON.parse() method to parse the file's contents into a JavaScript object. In this Node.js Read JSON File Example, we read a JSON file into a memory string using the fs.readFile() method. Click Execute to run the Node.js Read JSON File Example online and see the result.
How to check the Version of Node.js?
You can use the command line tool or terminal to determine the exact version of Node.js installed on your system. For this, execute the "node --version" command, and the Node.js will display its current version. Multiple versions of Node.js might coexist on your system simultaneously. Which version will be executed depends on the order of the paths to the Node.js listed in the Path variable and from which folder you run the command. Additionally, you can check the version of the npm package manager, which typically comes bundled with Node.js, by executing the "npm --version" command. In the Node.js Version Example, we print the Node.js version by executing the "node --version" command. Click Execute to run the Node.js Version Example online and see the result.
How to write JSON to a file in Node.js?
To write JSON data to a file in Node.js, you can use the fs (File System) module. To do this, you must first convert the JSON data into a string using the JSON.stringify() method and then write the resulting string to a file using the fs.writeFile() method. Writing a JSON string to a file is the same as writing any other text data to a file. Alternatively, you can use a third-party library "jsonfile", specifically designed to work with JSON files in Node.js, making reading and writing JSON files in Node.js much easier. In this Node.js Write File Example, we write JSON data to a file using the JSON.stringify() and fs.writeFile() methods. Click Execute to run the Node.js Write File Example online and see the result.
How to Write to a File using Node.js
To write data to a file in Node.js, developers typically use the native fs (file system) module. This invaluable module is central to managing file operations and interactions within Node.js. It is important to note that the fs module offers two different mechanisms for writing data: asynchronous (non-blocking) and synchronous (blocking). When diving deeper into these methods, the asynchronous approach is especially noteworthy. This method does not block the main thread, ensuring smooth operation even when working with large amounts of data or performing multiple operations simultaneously. As a result, it is predominantly recommended for most applications where responsiveness and parallel processing are critical.
How to work with JSON in Node.js?
In Node.js, working with JSON (JavaScript Object Notation) is very easy because JSON is the native data format for JavaScript, and you can easily parse and structure data in JSON format without any external libraries. JSON is commonly used to store system configurations, exchange data between servers, in API requests to external services, and for data storage. To convert a JSON string into a JavaScript object, you can use the JSON.parse() method. To convert a JavaScript object to a JSON string, you can use JSON.stringify(). In the Node.js JSON Example, we convert a JavaScript object to a JSON string using the JSON.stringify() method. Click Execute to run the Node.js JSON Example and see the result.
How to Read a File in Node.js?
To read a file in Node.js, you can use the built-in "fs" (File System) module. The "fs" module provides synchronous and asynchronous methods for reading files. While asynchronous methods are more suitable for most high-load applications, synchronous methods can be helpful in automation scripts and other scenarios. To read a file asynchronously in Node.js, use the fs.readFile() method and provide the file path as the first argument and a callback function as the last argument. To read a file synchronously in Node.js, use the fs.readFileSync() method, which takes the file path as the first argument and returns the file data resulting from the call. In this Node.js Read File Example, we use the asynchronous method for reading a file. Click the Execute to run the Node.js Read File Example online and see the result.
To send HTTP requests using the Node.js Fetch API, you need Node.js v18 or higher. Like the browser version, the Node.js Fetch API is promise-based and works perfectly with async/await structures. The global fetch() method takes two parameters: the URI of the resource you want to fetch and an optional "options" parameter that provides additional parameters for the request. Using the "options" parameter, you can pass the HTTP method, additional HTTP headers, POST data, and request credentials. The fetch() method returns a promise, which resolves to a Response object. You can obtain the response in JSON format by calling response.json(), or as plain text by calling response.text(). In this Node.js Fetch Example, we make a request to the ReqBin echo URL using the fetch() method. Click Execute to run the Node.js Fetch Example online and see the result.
How to Read a JSON File in Node.js?
To read a JSON file in Node.js, you can use the built-in fs (file system) module as you would to read any text file and then use the JSON.parse() method to parse the file's contents into a JavaScript object. In this Node.js Read JSON File Example, we read a JSON file into a memory string using the fs.readFile() method. Click Execute to run the Node.js Read JSON File Example online and see the result.
How to check the Version of Node.js?
You can use the command line tool or terminal to determine the exact version of Node.js installed on your system. For this, execute the "node --version" command, and the Node.js will display its current version. Multiple versions of Node.js might coexist on your system simultaneously. Which version will be executed depends on the order of the paths to the Node.js listed in the Path variable and from which folder you run the command. Additionally, you can check the version of the npm package manager, which typically comes bundled with Node.js, by executing the "npm --version" command. In the Node.js Version Example, we print the Node.js version by executing the "node --version" command. Click Execute to run the Node.js Version Example online and see the result.
How to write JSON to a file in Node.js?
To write JSON data to a file in Node.js, you can use the fs (File System) module. To do this, you must first convert the JSON data into a string using the JSON.stringify() method and then write the resulting string to a file using the fs.writeFile() method. Writing a JSON string to a file is the same as writing any other text data to a file. Alternatively, you can use a third-party library "jsonfile", specifically designed to work with JSON files in Node.js, making reading and writing JSON files in Node.js much easier. In this Node.js Write File Example, we write JSON data to a file using the JSON.stringify() and fs.writeFile() methods. Click Execute to run the Node.js Write File Example online and see the result.
How to Write to a File using Node.js
To write data to a file in Node.js, developers typically use the native fs (file system) module. This invaluable module is central to managing file operations and interactions within Node.js. It is important to note that the fs module offers two different mechanisms for writing data: asynchronous (non-blocking) and synchronous (blocking). When diving deeper into these methods, the asynchronous approach is especially noteworthy. This method does not block the main thread, ensuring smooth operation even when working with large amounts of data or performing multiple operations simultaneously. As a result, it is predominantly recommended for most applications where responsiveness and parallel processing are critical.
How to work with JSON in Node.js?
In Node.js, working with JSON (JavaScript Object Notation) is very easy because JSON is the native data format for JavaScript, and you can easily parse and structure data in JSON format without any external libraries. JSON is commonly used to store system configurations, exchange data between servers, in API requests to external services, and for data storage. To convert a JSON string into a JavaScript object, you can use the JSON.parse() method. To convert a JavaScript object to a JSON string, you can use JSON.stringify(). In the Node.js JSON Example, we convert a JavaScript object to a JSON string using the JSON.stringify() method. Click Execute to run the Node.js JSON Example and see the result.
How to Read a File in Node.js?
To read a file in Node.js, you can use the built-in "fs" (File System) module. The "fs" module provides synchronous and asynchronous methods for reading files. While asynchronous methods are more suitable for most high-load applications, synchronous methods can be helpful in automation scripts and other scenarios. To read a file asynchronously in Node.js, use the fs.readFile() method and provide the file path as the first argument and a callback function as the last argument. To read a file synchronously in Node.js, use the fs.readFileSync() method, which takes the file path as the first argument and returns the file data resulting from the call. In this Node.js Read File Example, we use the asynchronous method for reading a file. Click the Execute to run the Node.js Read File Example online and see the result.