Nodejs read file how to#
Nodejs read file install#
Nodejs read file code#

we are telling node.js to block other parallel process and do the current file reading process. In fs.readFile() method, we can read a file in a non-blocking asynchronous way, but in fs.readFileSync() method, we can read files in a synchronous way, i.e. I’m the maintainer of the package providing convenient file system utilities. The fs.readFileSync() method is an inbuilt application programming interface of fs module which is used to read the file and return its content. * Returns the content of the given file `path` as a string.Ĭonst text = await content('./existing-file.txt') Here’s a content method reading a file from the given file path and returning the content of this file: const = require('fs/promises')

You can return the file content as a string using the string value 'utf8' as the encoding option. If you would like to explore more new and interesting stuff about modern Node.js, take a look at the following articles: Node.js: Using dirname and filename with ES Modules Node.js: Getting User Input from Console (2 approaches) Node.js: Generate Images from Text Using Canvas Node.

Nodejs read file how to#

This readFile method accepts two arguments: the file path and options how to return the contents. Now that you know how to read YAML files with Node.js, let's see how we can write JavaScript objects/data to a YAML comes with the fs module.

Nodejs read file code#

Let loadedYaml = yaml.load(yamlStr) + '' Īnd running this code shows that the console.log method is indeed executed: $ node unsafe.js Running this code will output the following: Let fileContents = fs.readFileSync( './data.yaml', 'utf8') safeLoad() method: // read.js const fs = require( 'fs') To read and parse this file, we'll be using the. 1st, 2019' author: name: 'Scott Robinson' contact: ' ' tags: - javascript - node.js - web development const content 'Some content' Alternatively, you can use the synchronous version fs.writeFileSync (): const content 'Some content' You can also use the promise-based fsPromises. For the sake of this tutorial, let's say we have a file, data.yaml, which has the following contents: - # Article data article: title: 'Reading and Writing YAML to a File in Node.js/JavaScript' url_path: '/reading-and-writing-yaml-to-a-file-in-node-js-javascript' domain: '' port: 443 is-https: true meta: published-at: 'Nov. The easiest way to write to files in Node.js is to use the fs.writeFile () API. We'll start out by reading a YAML-formatted file and parsing it in to a JS object.

Nodejs read file install#

You can enable this by installing the package globally: $ npm install -g js-yaml Reading YAML Files in Node.js The js-yaml library also supports CLI usage, which allows you to inspect YAML files from the command line. You can verify that it's correctly installed by opening the REPL from the same directory and importing the package with the following: $ node For example, if js-yaml is only used for development purposes, then use -save-dev, otherwise use -save if it's used in the production environment of your app. Just be sure to use the correct flags for saving the dependency in your package.json file. InstallationĪs with any Node package, the installations is pretty simple using NPM: $ npm install js-yaml Other than that, the tutorial is quite simple and easy to follow for beginners. You'll also want to have Node.js and NPM installed on your system to follow along. You should have a basic understanding of JavaScript's syntax, specifically for the Node.js runtime. js-yaml is the more popular of the two libraries, so that's what we'll focus on for this article.īefore we move further, there are a few prerequisites for this tutorial. There are a few popular Node libraries used for parsing and generating YAML: yaml and js-yaml. Lastly, we will learn how to store a JavaScript object in a YAML file. We will start by seeing how data is stored in a YAML file, followed by loading that data into a JavaScript object.

In this article we're going to see how you can use YAML with a Node.js application. Thus, the only functionality required of YAML libraries is the ability to parse or generate YAML-formatted files. Since YAML essentially is a data format, the YAML specification, is fairly brief. In last few years YAML, which stands for YAML Ain't Markup Language, has become very popular for use in storing data in a serialized manner, typically configuration files.