Get password from input using node.js

Question

How to get password from input using node.js? Which means you should not output password entered in console.

Answer 1

Here is my tweaked version of nailer's from above, updated to get a callback and for node 0.8 usage:

/**
 * Get a password from stdin.
 *
 * Adapted from .
 *
 * @param prompt {String} Optional prompt. Default 'Password: '.
 * @param callback {Function} `function (cancelled, password)` where
 *      `cancelled` is true if the user aborted (Ctrl+C).
 *
 * Limitations: Not sure if backspace is handled properly.
 */
function getPassword(prompt, callback) {
    if (callback === undefined) {
        callback = prompt;
        prompt = undefined;
    }
    if (prompt === undefined) {
        prompt = 'Password: ';
    }
    if (prompt) {
        process.stdout.write(prompt);
    }

    var stdin = process.stdin;
    stdin.resume();
    stdin.setRawMode(true);
    stdin.resume();
    stdin.setEncoding('utf8');

    var password = '';
    stdin.on('data', function (ch) {
        ch = ch + "";

        switch (ch) {
        case "\n":
        case "\r":
        case "\u0004":
            // They've finished typing their password
            process.stdout.write('\n');
            stdin.setRawMode(false);
            stdin.pause();
            callback(false, password);
            break;
        case "\u0003":
            // Ctrl-C
            callback(true);
            break;
        default:
            // More passsword characters
            process.stdout.write('*');
            password += ch;
            break;
        }
    });
}