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node.jsreadline

Getting user's input in NodeJS "readline" module

In a NodeJS program, I want to accept input from console. I chose readline to do this. The code can be simplified as follow:

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

function getInput() {
    rl.question("", (ans) => {
        console.log(ans);
    })
}

getInput();
rl.close();

But every time I run this program, it exits before I could make any input.

I think the problem is caused by the statement rl.close(), it may close the interface before accepting any input. How can I avoid this?

Thanks for answering!

Solution

  • Wrap the getInput in a promise like this:

    function getInput() {
    return new Promise(function (resolve, reject) {
        rl.question("what's your option? ", (ans) => {
            console.log(ans);
            resolve(ans);
        });
    });
}

// and await here

await getInput();
rl.close();