Category: JavaScript Answers

Sometimes, we want to fix username and password not accepted when using Nodemailer.

In this article, we’ll look at how to fix username and password not accepted when using Nodemailer.

How to fix username and password not accepted when using Nodemailer?

To fix username and password not accepted when using Nodemailer, we should try to allow less secure apps to access account.

We can allow less secure apps to access a Gmail account by going to https://myaccount.google.com/lesssecureapps and then toggle the option on.

Then we can log in and and send an email message with

const nodemailer = require("nodemailer");

const transporter = nodemailer.createTransport({
  host: "smtp.gmail.com",
  port: 587,
  secure: false,
  requireTLS: true,
  auth: {
    user: "your.gmail.account@gmail.com",
    pass: "your.password",
  },
});

const mailOptions = {
  from: "your.gmail.account@gmail.com",
  to: "receivers.email@domain.com",
  subject: "Test",
  text: "Hello World!",
};

transporter.sendMail(mailOptions, (error, info) => {
  if (error) {
    return console.log(error.message);
  }
  console.log("success");
});

We create a nodemailer.createTransport instance with the credentials and SMTP server host address.

And then we call sendMail with the mailOptions object that has the values for the email message to send the email.

Conclusion

To fix username and password not accepted when using Nodemailer, we should try to allow less secure apps to access account.

Sometimes, we want to broadcast messages on a namespace with socket.io and Node.js.

In this article, we’ll look at how to broadcast messages on a namespace with socket.io and Node.js.

How to broadcast messages on a namespace with socket.io and Node.js?

To broadcast messages on a namespace with socket.io and Node.js, we can use the of method.

For instance, we write

const io = require("socket.io").listen(80);
io.of("/admins").emit("message", { message: "Hello admins!" });

to call io.of with the namespace to broadcast to.

And then we call emit to send the message to that namespace.

Conclusion

To broadcast messages on a namespace with socket.io and Node.js, we can use the of method.

Sometimes, we want to fix the "cannot find module ‘mongodb’" error with Node.js.

In this article, we’ll look at how to fix the "cannot find module ‘mongodb’" error with Node.js.

How to fix the "cannot find module ‘mongodb’" error with Node.js?

To fix the "cannot find module ‘mongodb’" error with Node.js, we should install the mongodb module.

To install it globally, we run

npm install mongodb -g 

We can also install it locally by running

npm install mongodb 

after going into our Node.js project folder.

Conclusion

To fix the "cannot find module ‘mongodb’" error with Node.js, we should install the mongodb module.

Sometimes, we want to create a secure (TLS/SSL) Websocket server with Node.js

In this article, we’ll look at how to create a secure (TLS/SSL) Websocket server with Node.js.

How to create a secure (TLS/SSL) Websocket server with Node.js?

To create a secure (TLS/SSL) Websocket server with Node.js, we can use the https module.

For instance, we write

const WebSocket = require("ws").Server;
const { createServer } = require("https");
const fs = require("fs");

const server = createServer({
  cert: fs.readFileSync(config.sslCertPpath),
  key: fs.readFileSync(config.ssKeyPpath),
});
const socket = new WebSocket({
  server,
});

socket.on(() => {
  //...
});
server.listen(config.port);

to call createServer to create a HTTPS server with the cert and key certificate and key files.

Then we use the WebSocket constructor to create a WebSocket server from the HTTPS server.

Next, we call socket.on to listen for communication.

And we call server.listen to start the server.

Conclusion

To create a secure (TLS/SSL) Websocket server with Node.js, we can use the https module.

Sometimes, we want to create an AWS Lambda function to write to S3with Node.js.

In this article, we’ll look at how to create an AWS Lambda function to write to S3with Node.js.

How to create an AWS Lambda function to write to S3with Node.js?

To create an AWS Lambda function to write to S3with Node.js, we can call putObject.

For instance, we write

var AWS = require("aws-sdk");
const putObjectToS3 = (bucket, key, data) => {
  const s3 = new AWS.S3();
  const params = {
    Bucket: bucket,
    Key: key,
    Body: data,
  };
  s3.putObject(params, (err, data) => {
    //...
  });
};

to create the putObjectToS3 function.

In it, we call s3.putObject with the info in the params object to push our file, which is stored in data, to the location with the given bucket and key.

Conclusion

To create an AWS Lambda function to write to S3with Node.js, we can call putObject.