Learn back-end development with Node.js, covering HTTP servers, databases, JWT, WebSockets, and more. Consolidate your skills in a capstone project by building a RESTful API for a practical use case.

nodegui.tar.gz

Without_start_script

With_start_script

cookingProcess

writeFileExample

fileProcessor

fileTask

dynamicServer

directoryManager

axios

expressjs

axios_http

dotenv

lodash

nodemon

postgres

postgres-api

postgres-exercise

bcrypt

complete_authentication

websocket-server

math-jest

async-jest

npm-intro-exercise

babel

process_env

process_dotenv

process_lifecycle

Without_start_script-debug

babel-copy

This Node.js course offers a structured path to mastering back-end development. It begins with introducing Node.js and JavaScript in the server-side context, covering modules and foundational concepts. You’ll explore asynchronous programming with callbacks, Promises, async/await, and the event loop, followed by event-driven programming with the EventEmitter class. Practical skills include file system operations, working with buffers, and using streams for efficient data handling.

The course will then guide you through building HTTP servers, implementing routing, handling GET/POST requests, and integrating PostgreSQL for database-driven APIs. Additional topics include JWT-based authentication, WebSockets for real-time features like chat systems and live dashboards, and testing with Jest.

In the capstone project, you’ll build a RESTful API that stores arbitrary JSON data and enables filtering and retrieval in JSON, HTML, or CSV formats, enhancing your skills in building scalable back-end solutions.

Learn Node.js

What will be the output of the following code?

```javascript
const promise = new Promise((resolve, reject) => {
    console.log("Step 1: Inside Promise");
    resolve("Step 2: Promise resolved");
});

promise.then(result => {
    console.log(result);
});

console.log("Step 3: After Promise");
```


What will be the output of the following code?
<pre><code class="language-javascript">const promise = new Promise((resolve, reject) =&gt; {
 console.log(&quot;Step 1: Inside Promise&quot;);
 resolve(&quot;Step 2: Promise resolved&quot;);
});

promise.then(result =&gt; {
 console.log(result);
});

console.log(&quot;Step 3: After Promise&quot;);
</code></pre>

It allows any JavaScript function to return a Promise automatically.

It stops the function from blocking the call stack.

It prevents errors by automatically retrying failed operations.

Which statement best explains the purpose of the `async` keyword in Node.js?

Which statement best explains the purpose of the <code>async</code> keyword in Node.js?

To delay function execution until a timer completes.

To wrap a synchronous function in a Promise.

To pause execution of the async function until the awaited Promise resolves or rejects.

To create a new Promise and resolve it automatically.

What is the purpose of the `await` keyword in an async function?

What is the purpose of the <code>await</code> keyword in an async function?

By wrapping the `await` expression in a `try` block and catching errors with `catch`.

By adding a `.catch()` method after `await`.


By using an error event listener in the function.

By calling a rejection handler within the async function.

When using `async`/`await`, how should errors be handled?

When using <code>async</code>/<code>await</code>, how should errors be handled?

```javascript
async function fetchData() {
    return "Data fetched";
}
const data = await fetchData();
console.log(data);
```

```javascript
async function fetchData() {
    console.log("Data fetched");
}
```

```javascript
fetchData((data) => {
    console.log("Awaiting data...");
    console.log(data);
});
```

```javascript
const fetchData = new Promise((resolve) => {
    setTimeout(() => resolve("Data fetched"), 1000);
});
```

What is the correct way to refactor this callback-based code using `async`/`await`?

```javascript
function fetchData(callback) {
    setTimeout(() => {
        callback("Data fetched");
    }, 1000);
}

fetchData((data) => {
    console.log(data);
});

```

What is the correct way to refactor this callback-based code using <code>async</code>/<code>await</code>?
<pre><code class="language-javascript">function fetchData(callback) {
 setTimeout(() =&gt; {
 callback(&quot;Data fetched&quot;);
 }, 1000);
}

fetchData((data) =&gt; {
 console.log(data);
});

</code></pre>

Test your understanding of asynchronous programming in Node.js with this comprehensive quiz.

Getting Started with Node.js

Global Objects and Modules

Asynchronous Programming

Event-Driven Programming

Core Node.js Modules

Building a Basic Web Server

npm and Package Management

Working with Databases

Advanced Topics

Wrap Up

Appendix

Building a RESTful API with Node.js and PostgreSQL

Quiz: Asynchronous Programming