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Duration of the online course: 4 hours and 36 minutes

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Free JavaScript course on working with APIs and data: fetch, JSON, charts, maps, Node.js, databases, environment variables, and deployment.

In this free course, learn about

Course Overview and Setup
Client-Side Data Fetching and Visualization
Mapping and Real-Time Data Updates in the Browser
Building a Node.js Server and Storing Data
Server-Side API Aggregation, Mapping, and Deployment

Course Description

Working with Data and APIs in JavaScript is a free web development course that helps you move from basic requests to building practical, data-driven applications. You will learn how to fetch information from the web, work with common data formats, and turn raw responses into interactive experiences in the browser.

The course explores core techniques such as using fetch for GET and POST requests, handling JSON, and working with tabular datasets. You will also practice presenting information visually through charting and mapping, using popular tools to plot data and place points on interactive maps.

Beyond the browser, you will get introduced to server-side workflows with Node.js, including making API calls from the server, collecting user or location-based information with geolocation features, and persisting results. You will learn how to save and query data in a database, refresh live data at intervals, and handle tasks like saving images and working with Base64 encoding.

To round out a real-world development workflow, the course covers safer handling of secrets such as API keys with environment variables, along with guidance for pushing projects to GitHub and deploying a working web application. By the end, you will have a clearer understanding of how front-end and back-end pieces fit together when building modern apps powered by external APIs.

Course content

Video class: Working with Data and APIs in JavaScript 01m
Exercise: What is described as the main attraction of the course “Working with Data and APIs in JavaScript”?
Video class: Setup: Everything you need to begin the course Working with Data and APIs in JavaScript 03m
Exercise: Which tool becomes especially important in later modules because it’s used to run commands from the terminal?

Video class: 1.1: fetch() - Working With Data 15m
Exercise: When fetching an image file with the Fetch API, what step is needed before assigning it to an < img > element’s src?
Video class: 1.2 Tabular Data - Working With Data 17m
Exercise: When manually parsing a CSV string in JavaScript, what delimiter is used first to split the text into rows?
Video class: 1.3: Graphing with Chart.js - Working With Data 19m
Exercise: What is the main reason the chart is created only after awaiting the data-loading function?
Video class: 1.4: JSON - Working with Data and APIs in JavaScript 16m
Exercise: When retrieving ISS location data from an external API in JavaScript, which step correctly converts the fetch response into a usable JavaScript object?

Video class: 1.5 Mapping Geolocation with Leaflet.js - Working with Data and APIs in JavaScript 15m
Exercise: In Leaflet.js, what must you do to make the map background images appear (not just an empty grid with controls)?
Video class: 1.6 Refreshing Data with setInterval() - Working with Data and APIs in JavaScript 08m
Exercise: Which JavaScript feature is used to automatically refresh the ISS latitude/longitude data at a fixed rate without reloading the page?

Video class: 2.1 Server-side with Node.js - Working with Data and APIs in JavaScript 18m
Exercise: Why is Node.js introduced for the project instead of only using client-side JavaScript?
Video class: 2.2 Geolocation Web API - Working with Data and APIs in JavaScript 15m
Exercise: Why is geolocation (and similar features) often handled carefully when building client/server JavaScript apps?
Video class: 2.3 HTTP Post Request with fetch() - Working with Data and APIs in JavaScript 16m
Exercise: What Express feature must be enabled so a server can read incoming POST data as JSON in `request.body`?
Video class: 2.4 Saving to a Database - Working with Data and APIs in JavaScript 11m
Exercise: What is the main reason to use a database in a client–server JavaScript app?
Video class: 2.5 Database Query - Working with Data and APIs in JavaScript 13m
Exercise: When retrieving all records from the server to display them on a page, which combination is used to query the database and send the results back to the client?
Video class: 2.6 Saving Images and Base64 Encoding - Working with Data and APIs in JavaScript 12m
Exercise: How can a webcam frame be sent from the browser to a server as part of a POST request?
Video class: 2.7 Project Wrap-up: Accessibility and Design - Working with Data and APIs in JavaScript 11m
Exercise: Why might you fetch data from an external API using Node (server-side) instead of directly from the client?

Video class: 3.1 API calls from Node.js (Weather data from Dark Sky) - Working with Data and APIs in JavaScript 17m
Exercise: Why is a server-side (Node) proxy used to request weather data from an external API?
Video class: 3.2 Open Air Quality API in Node.js - Working with Data and APIs in JavaScript 16m
Exercise: How can one server response include data from multiple APIs in a JavaScript app?
Video class: 3.3 Mapping Database Entries with Leaflet.js - Working with Data and APIs in JavaScript 13m
Exercise: On the View Checkins page, what technique is used to display each saved checkin on the map?
Video class: 3.4 Hiding API Keys with Environment Variables (dotenv) and Pushing Code to GitHub 11m
Exercise: What is the main purpose of using a dotenv file with the dotenv package in a Node.js project?
Video class: 3.5 Web Application Deployment (Glitch and Heroku) - Working with Data and APIs in JavaScript 19m

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