node-express-mongodb-jwt-rest-api-skeleton/app/controllers/auth/helpers/generateToken.js

Node.js express.js MongoDB JWT REST API - This is a basic API REST skeleton written on JavaScript using async/await. Great for building a starter web API for your front-end (Android, iOS, Vue, react, angular, or anything that can consume an API)

const jwt = require('jsonwebtoken')
const { encrypt } = require('../../../middleware/auth')

/**
 * Generates a token
 * @param {Object} user - user object
 */
const generateToken = (user = '') => {
  try {
    // Gets expiration time
    const expiration =
      Math.floor(Date.now() / 1000) + 60 * process.env.JWT_EXPIRATION_IN_MINUTES

    // returns signed and encrypted token
    return encrypt(
      jwt.sign(
        {
          data: {
            _id: user
          },
          exp: expiration
        },
        process.env.JWT_SECRET
      )
    )
  } catch (error) {
    throw error
  }
}

module.exports = { generateToken }