minimal-password-prompt

Minimal hidden password prompt for Node.js! [npm] [github]

Simple, no extra hassles

package	dependencies	dependents	total lines of production code
minimal-password-prompt	0	0	48
password-prompt	2	43	2147

• No dependencies
• Multiplatform: tested on Windows, Linux and macOS
• Minimal: Less than 50 lines of code

Seriously, you can also just copy and paste to your project:

const stdin = process.stdin;
const stdout = process.stdout;

const captureStdin = (onData) => {
  stdin.setEncoding('utf-8');
  stdin.setRawMode(true);
  stdin.on('data', onData);
  stdin.resume();
};

const releaseStdin = (onData) => {
  stdin.pause();
  stdin.removeListener('data', onData);
  stdin.setRawMode(false);
  stdout.write('\n');
};

const prompt = (question, ctrlcExits = true) => (
  new Promise((resolve, reject) => {
    let input = '';
    const onData = (data) => {
      switch (data) {
        case '\u000A': // \n
        case '\u000D': // \r
        case '\u0004': // Ctrl+D
          releaseStdin(onData);
          resolve(input);
          break;
        case '\u0003': // Ctrl+C
          releaseStdin(onData);
          ctrlcExits // exit or raise error
            ? process.exit()
            : reject(new Error('Ctrl+C'));
          break;
        case '\u0008': // Backspace
        case '\u007F': // Delete
          input = input.slice(0, -1);
          break;
        default: // any other
          input += data;
      };
    };
    captureStdin(onData);
    stdout.write(question);
  })
);

module.exports = prompt;

(please sill do remember to include MIT license/copyright)

Usage

const prompt = require('minimal-password-prompt');

prompt('enter password: ').then(pw => {
  console.log(`Password: ${pw}`);
});

or with async/await:

const prompt = require('minimal-password-prompt');

(async () => {
  const pw = await prompt('enter password: ');
  console.log(`password: ${pw}`);
})();

More examples here

prompt reference

Parameters:

• question (String) prompt output before user input
• ctrlcExits (Boolean), optional
  • true: Ctrl+C exits program (default)
  • false: Ctrl+C throws error

Returns:

• Promise<String> user input during prompt

Installation

Install with npm:

npm install --save minimal-password-prompt