How to input data through console in node.js?

Question

Although similar questions have already appeared, following theirs instructions I obtain an error. So my code is as follows

var readline = require('readline').createInterface({
input: process.stdin,
output: process.stdout
});

    var name;
    readline.question(`What's your name?`, (name))
        readline.close()

and as a result I have

{ RequestError: Syntax error, permission violation, or other nonspecific error
at StreamEvents.req.once.err

Do you know what is wrong? I'm using npm readline package

SahilMak · Accepted Answer · 2018-11-10 19:59:51Z

2

According to the documentation, the second argument should be a callback function. What you currently have is an uninitialized variable. To fix it, you could do something like this:

const readline = require('readline').createInterface({
    input: process.stdin,
    output: process.stdout
});

const response = function (name) {
    console.log('Hello ' + name);
};
readline.question(`What's your name?`, response(name));
readline.close();

(I'm using const instead of var to adhere to ES6 standards for JavaScript/Node)

answered Nov 10, 2018 at 19:59

SahilMak

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Comments

gkont · Accepted Answer · 2018-11-10 19:52:01Z

1

The second argument of question should be a callback function

readline.question('What\'s your name',(name)=>{
    console.log(name)
});

answered Nov 10, 2018 at 19:52

gkont

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