Sage-Tips

How do you input data in node JS?

Accept input from the command line in Node. js

1. const readline = require(‘readline’). createInterface({
2. input: process. stdin,
3. output: process. stdout.
4. })
5. readline. question(`What’s your name?`, name => {
6. console. log(`Hi ${name}!`)
7. readline. close()
8. })

How do I read a file in node JS?

Node. js fs. readFile() Method

1. filename: It holds the name of the file to read or the entire path if stored at other location.
2. encoding: It holds the encoding of file. Its default value is ‘utf8’.
3. callback_function: It is a callback function that is called after reading of file. It takes two parameters:

How do you write a node JS command?

Enter the following commands to create a new project folder and initialize the project.

1. mkdir hello-cli cd hello-cli npm init.
2. #!/usr/bin/env node console.
3. “bin”: { “hello”: “./bin/index.js” }

How do you write JavaScript in terminal?

How to run JavaScript in Terminal

1. open terminal,
2. create an empty file: touch script.js ,
3. edit file and add a simple function: var add = (a, b) => a + b; console. log(add(5, 10));
4. run script using node script. js command,
5. the output should be 15 .

How do you input in JavaScript?

In JavaScript, we can get user input like this: var name = window. prompt(“Enter your name: “); alert(“Your name is ” + name); The code above simply prompts the user for information, and the prints out what they entered in.

How do I write a node file?

Currently there are three ways to write a file:

1. fs.write(fd, buffer, offset, length, position, callback ) You need to wait for the callback to ensure that the buffer is written to disk.
2. fs.writeFile(filename, data, [encoding], callback)
3. fs.createWriteStream(path, [options] )

How do I start a node server in terminal?

Steps

1. Open a terminal window (Mac) or a command window (Windows), and navigate (cd) to the ionic-tutorial/server directory.
2. Install the server dependencies: npm install.
3. Start the server: node server. If you get an error, make sure you don’t have another server listening on port 5000.

What is Node JS terminal?

js – REPL Terminal. Advertisements. REPL stands for Read Eval Print Loop and it represents a computer environment like a Windows console or Unix/Linux shell where a command is entered and the system responds with an output in an interactive mode. Node.js or Node comes bundled with a REPL environment.

How do I get out of node in terminal?

If you’re in a Unix terminal or Windows command line and want to exit the Node REPL, either…

1. Press Ctrl + C twice, or.
2. type .exit and press Enter, or.
3. press Ctrl + D at the start of a line (Unix only)

How do I run a script in terminal?

Steps to write and execute a script

1. Open the terminal. Go to the directory where you want to create your script.
2. Create a file with . sh extension.
3. Write the script in the file using an editor.
4. Make the script executable with command chmod +x .
5. Run the script using ./.