10 Popular API Examples: A Complete List (2024)

10 Popular API Examples: A Complete List (1)

Every time you use an app such as Facebook or Instagram, check the weather or send an instant message, you’re using an API. API examples are everywhere, in the applications you use on a daily basis.

APIs are basically the middlemen of apps and web services, allowing different applications to communicate with each other. They are a key aspect of our digital world and in software development. With APIs, we are able to engage in digital experiences on our phones and computers every day.

So what are APIs and some API examples? Here we will explain the concept of API in the most understandable way and provide you with 10 most popular examples of API. Understanding APIs is understanding how our fascinating digital world works.

In this article, you will get to learn about:

  1. Twitter API
  2. ChatGPT API
  3. Google Map API
  4. Discord API
  5. Github API
  6. Paypal API
  7. eCommerce API
  8. YouTube API
  9. Instagram API
  10. Slack API

What is an API?

We’ll explain the concept of an API from both a technical and non-technical point of view.

From a technical perspective, APIs, or Application Programming Interfaces, are a set of protocols, routines, and tools for building applications. An API defines how different software components should interact with each other, allowing developers to create software applications that can interact with other applications, services, or platforms.

APIs allow developers to access functionality or data provided by a remote service or application through a standardized interface, without needing to understand the underlying code or infrastructure of the service. With an API, developers can build applications that integrate with other systems and services.

In other words, APIs allow application A to connect with application B.

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Let’s look at APIs from a more common and non-technical perspective.

Suppose that we have a weather app and a messaging app. Here's a simple explanation of an API using these two apps:

In this example, the weather app wants to provide weather updates to the messaging app. To perform this, the weather app developers create an API that exposes specific functions and data related to weather information.

The messaging app developers can then integrate this weather API into their app. They use the API to send requests for weather updates, such as the current temperature or forecast, to the weather app's server.

In a way,an API is like a bridge or a middleman that connects two different apps. If application A wants to gain access to information/functionality from application B, it sends out an instruction (i.e. the API). Application B reads the instruction, and returns the requested information to application A.

How To Use An API?

To use an API, you first need to find the API documentation, which will tell you how to make requests to the API and what responses to expect. APIs use specific URLs and protocols to receive and send data, and you'll need to use a programming language or tool that supports HTTP requests to interact with the API.

Once you know how to make requests, you'll need to create an API key or access token, which is a unique identifier that lets the API know who is making the request. You'll include this key or token in your requests to the API.

After you've made a request, the API will send back a response in a specific format, such as JSON or XML, which your program can parse and use to display data or perform other actions.

Types of API

There are so many types of APIs. Below are several of them:

By use case:

  • Open APIs: publicly available APIs that anyone can use to access a company’s data
  • Internal APIs: APIs used within a company/organization to communicate information between internal apps
  • Partner APIs: APIs designed specifically for third-party developers/partners, and are more limited in access

By protocols:

  • REST API: a widely used architecture for building web services using HTTP methods like GET, POST, PUT, and DELETE format to interact with data resources. REST APIs typically return data in JSON or XML format
  • SOAP API: a messaging protocol used to exchange structured data between web services. SOAP APIs use the XML format for data exchange, and they typically require more bandwidth and processing power than REST APIs. SOAP APIs support more advanced features like transaction, security, and reliability
  • GraphQL API: a query language for APIs that was developed by Facebook. GraphQL APIs allow developers to retrieve only the data they need, using a single query. This can result in more efficient data retrieval and reduced network traffic.
  • Webhook API: a way to send real-time data from one application to another. Webhook APIs use a simple HTTP POST request to send data to a URL specified by the recipient application. The recipient application can then take action on the data in real-time. Webhook APIs are often used for event-driven applications, such as chatbots or notification systems.

10 API Examples of Popular Apps

1. Twitter API

Twitter offers a wide variety of APIs that developers can use to build applications that interact with Twitter. As one of the most popular social media platforms, Twitter is a great destination for businesses wanting to advertise their products and services. Twitter's Ads API provides businesses with a way to create and manage their advertising campaigns on the Twitter platform. With this API, businesses can create and customize their ads, target specific audiences, and track the performance of their campaigns in real-time.

For example, social media marketing management tools likeBuffer allows users to schedule their Twitter marketing calendar, and they must use Twitter APIs to extract analytics from Twitter for their users. Below is the Buffer dashboard with important Twitter metrics such as tweets, replies, retweets, clicks, and more.

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Source:Backlinko

Another interesting API is the Twitter Direct Message API. With the Twitter Direct Message API, developers can create chatbots that can automatically respond to DMs, providing information, answering questions, or carrying out other tasks. For example, a company can use a chatbot to provide customer support through Twitter DMs, allowing users to quickly get help with their questions or issues.

2. ChatGPT API

What sets ChatGPT apart from other chatbots is its ability to engage in highly realistic, human-like conversations. Unlike traditional chatbots, which rely on pre-programmed responses and scripted dialogue, ChatGPT uses advanced natural language processing and machine learning algorithms to learn and adapt to each user's unique style and preferences.

The most common usage of ChatGPT API is transforming it into a highly customizable chatbot for organizations. ChatGPT will be integrated into the chatbot platform the company is using, or even embedded on the website itself. The language model can be trained to answer highly specific questions on the company’s products and services. Here is aguide to build an AI Chatbot with ChatGPT API with Python.

There have been many emerging AI-powered Content Writing assistants powered by ChatGPT like thisplugin for Wordpress, which leverages the ChatGPT API to bring the chatbot’s powerful functionalities onto your Wordpress backend, allowing you to create content within a few seconds.

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3. Google Map API

The Google Maps API is a web-based service provided by Google that allows developers to embed maps into their web pages or applications. To use the Google Maps API, developers need to authenticate themselves by obtaining an API key. This key is unique to each developer and is used to track usage and ensure that the service is not abused.

Developers can then embed a map into their web page or application using the Google Maps JavaScript API. This API allows developers to customize the map's appearance and functionality, including markers, infowindows, and overlays. Users can freely interact with the map straight on the website, finding the location of their favorite service without having to open Google Maps elsewhere.

Some of the most popular use cases of the Google Map API is providing location-based services. If your online business involves delivering products or providing services at customers' locations, you can leverage the Google Maps API to track shipments or service providers in real-time. This allows your customers to monitor the progress of their delivery or service and estimate arrival times accurately..

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For example, here is an Address Verification window at a local pizza shop. As you type in your address and click Find Me, the address will be sent to Google Map via the Google Map API. Google Map will return the exact location for the pizza shop so that the delivery driver knows where to bring the pizzas to.

4. Discord API

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Discord is a free communication platform designed for gamers. It allows users to create and join "servers," which are essentially group chat channels for specific topics or games. With the Discord API, developers can create bots or add extra features to their app using data and services provided by Discord. In simpler terms, the Discord API is a way for developers to interact with Discord using code. REST is one way that developers can use to interact with the Discord API.

Using Discord's REST API, developers can retrieve data about users, such as their profile photos and usernames, by sending HTTP requests to a specific endpoint. This data can be used in external applications or within a Discord application. Essentially, the REST API acts as a bridge between the Discord server and external applications, allowing developers to access and use Discord data in their own applications.

5. GitHub API

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GitHub API is a set of tools that allows developers to interact with GitHub programmatically. This means that developers can use code to perform various tasks on GitHub, such as creating, reading, updating, and deleting repositories, files, and issues. It provides an efficient and standardized way for developers to access and manage data on GitHub. Instead of having to manually perform actions on the website, developers can use the API to automate tasks and integrate GitHub with other tools and services.

For example, a developer could use the GitHub API to automatically create a new repository and add collaborators whenever a new project is created in their project management tool. This saves time and reduces the risk of errors that can occur when manually performing these tasks.

6. PayPal API

Paypal is one of the most popular payment service providers, and its API not only simplifies the payment process but also makes transactions extra secure.

You’ll be able to find Paypal checkout portal on almost any popular eCommerce website. Simply click on the Paypal Checkout button and you’ll be redirected to PayPal, where you can complete the transaction immediately. Your debit/credit card information is registered with Paypal, but Paypal doesn’t share this information through their API, so you can rest assured that your financial safety is guaranteed. This is why Paypal API is so favored by web developers on eCommerce sites.

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7. eCommerce API

Shopify is an eCommerce platform that allows small businesses to create and manage their online stores with ease. However, sometimes businesses do require custom solutions that go beyond what Shopify provides. This is where Shopify APIs come in.

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Developers can use the APIs to build custom storefronts, add new features and functionality, integrate with third-party apps, payment gateways, and shipping providers, as well as automate various aspects of the eCommerce process.

For example, a developer could use the Shopify API to build a custom storefront that integrates with a third-party inventory management system, allowing businesses to manage their inventory and orders more efficiently. Alternatively, a developer could use the API to create a custom payment gateway that integrates with a specific payment provider that is not natively supported by Shopify. With such an API, Shopify expands their customization capabilities, reaching a much wider customer base.

8. YouTube API

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YouTube offers an API for any developers wanting to interact with the videos on their platform. The most popular use case is video integration. YouTube API allows you to embed a video straight on your platform. For example, a news website could use the YouTube API to embed videos related to a particular news story, or a fitness app could use the API to add workout videos to its library. The YouTube API allows developers to customize the video player's size, playback quality, and other settings to match their application's design and functionality.


Not just that, you can even leverage the YouTube API for data analysis. Developers can extract data about videos, channels, and playlists, such as view counts, likes, comments, and subscribers. This data can be used to perform analytics, generate reports, and inform content strategy. For example, there is a huge dataset on Kaggle calledYouTube Faces With Facial Keypoints containing celebrities facial feature data. This 17GB dataset can be used for facial recognition analysis.

9. Instagram API

Instagram API is similar to Twitter API, which allows businesses and shop owners to expand its native capabilities as a social media platform.Shop owners may want to connect their Instagram feeds with their website so users can have a more holistic view of their shop. Visitors can view the comments and interactions on the Instagram posts, which would have been impossible without the Instagram API.

Likewise, visitors on the Instagram page can purchase the products they want directly from Instagram. The order data will be transferred to the website backend for order fulfillment.

10. Slack API

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Slack is a cloud-based communication and collaboration platform that enables teams to communicate effectively and work together remotely. From a technical perspective, the Slack API is quite similar to the Discord API as developers can use Slack API to build custom bots that can automate repetitive tasks or provide specific information to Slack users. For example, a team can build a bot that fetches weather information for a specific location or a bot that sends reminders for upcoming deadlines.

Another cool thing to do with Slack API is enabling cross-platform messages to Microsoft Teams. If your team uses both platforms, you can use the Slack API to send and receive DMs and channel messages cross-platform. You can create aSlackbot to automate anything you want yourself: make a document, find an email address, or start a call.

What is API Testing?

APIs are the backbone of digital interactions. However, APIs don’t always work correctly. In such a complicated ecosystem, APIs may fail, retrieving the wrong data, losing data, corrupting data, or worse, leading to system failure. It is when developers need API testing to prevent such issues from happening.

If you have an upcoming software interview, you need to know how to do API testing. Below is a quick guide to API testing:

  1. Identify the API endpoints: these are the URLs through which your application communicates with the API.
  2. Determine the API method and parameters: API method includes GET, POST, PUT, DELETE and the parameters (query parameters, path parameters, header parameters, and body parameters) required for the API call.
  3. Create test cases: Create test cases that cover different scenarios, such as valid input, invalid input, and edge cases. You can either use Selenium to test it (which requires Java skills or a low-code automation testing tool likeKatalon)
  4. Set up the test environment
  5. Execute the test cases

Why Katalon For API Testing?

Katalon is an all-in-one test automation platform that can performAPI testing for teams of any scale, at any engineering expertise. Katalon makes it easy to create and run automated tests for your API thanks to the low-code features. It has keyword libraries that simplify the test creation process.

For example, you want to test the response status code of a GET request to an API endpoint. Simply create a new test case in Katalon Studio from the New toolbar.

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Next, name your test case. Here we’ll name it “API Testing”.

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On the top bar you should see a list of Quick Start icons. Click on the “New draft REST Request” to make a REST API Request.

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Here you can select the request method from the drop down list. On the right side will be where the response status is displayed. We’ll choose the GET method.

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Next, simple type in your API endpoint URL and hit the Run button.

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Within a few seconds, you have received your Response status of 200, with detailed information on request time, size, and verification script. You now have your API test case without having to write any code! And this can be scaled to test hundreds of APIs.

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As a top-teir API testing tool, Katalon is built to work with modern frameworks and requires minimal maintenance. Katalon supports all types of REST, SOAP/1.1 and SOAP/1.2 requests andcan efficiently perform sustainable and productive testing through the use of data-driven testing techniques for increased test coverage and dependability. And Katalon supports more than just API testing - you can do web, mobile, desktop, and visual testing with Katalon, all in 1 place, across a wide variety of environment!

Start API Testing With Katalon 30-day Free Trial

APIs: A Comprehensive Overview

What is an API?

From a technical perspective, APIs, or Application Programming Interfaces, are a set of protocols, routines, and tools for building applications. They define how different software components should interact with each other, enabling developers to create software applications that can interact with other applications, services, or platforms. APIs allow developers to access functionality or data provided by a remote service or application through a standardized interface, without needing to understand the underlying code or infrastructure of the service .

How to Use an API?

To use an API, you first need to find the API documentation, which will tell you how to make requests to the API and what responses to expect. APIs use specific URLs and protocols to receive and send data, and you'll need to use a programming language or tool that supports HTTP requests to interact with the API. After you've made a request, the API will send back a response in a specific format, such as JSON or XML, which your program can parse and use to display data or perform other actions.

Types of APIs

There are several types of APIs based on use case and protocols:

  • By Use Case:
    • Open APIs: publicly available APIs that anyone can use to access a company’s data
    • Internal APIs: used within a company/organization to communicate information between internal apps
    • Partner APIs: designed specifically for third-party developers/partners, and are more limited in access
  • By Protocols:
    • REST API: a widely used architecture for building web services using HTTP methods like GET, POST, PUT, and DELETE format to interact with data resources. REST APIs typically return data in JSON or XML format
    • SOAP API: a messaging protocol used to exchange structured data between web services. SOAP APIs use the XML format for data exchange and support more advanced features like transaction, security, and reliability
    • GraphQL API: a query language for APIs that allows developers to retrieve only the data they need, using a single query
    • Webhook API: a way to send real-time data from one application to another using a simple HTTP POST request to send data to a specified URL.

API Examples of Popular Apps

  1. Twitter API: Offers a wide variety of APIs that developers can use to build applications that interact with Twitter, such as the Ads API and Direct Message API.
  2. ChatGPT API: Known for its ability to engage in highly realistic, human-like conversations and is used to build AI chatbots.
  3. Google Map API: Allows developers to embed maps into their web pages or applications and is commonly used for providing location-based services.
  4. Discord API: Enables developers to create bots or add extra features to their app using data and services provided by Discord.
  5. GitHub API: Allows developers to interact with GitHub programmatically, performing tasks such as creating, reading, updating, and deleting repositories, files, and issues.
  6. PayPal API: Simplifies the payment process and makes transactions extra secure, commonly used on eCommerce websites.
  7. eCommerce API: Used to build custom storefronts, add new features and functionality, integrate with third-party apps, payment gateways, and shipping providers, as well as automate various aspects of the eCommerce process.
  8. YouTube API: Allows developers to interact with the videos on their platform, commonly used for video integration and data analysis.
  9. Instagram API: Similar to Twitter API, it allows businesses and shop owners to expand its native capabilities as a social media platform.
  10. Slack API: Used to build custom bots that can automate repetitive tasks or provide specific information to Slack users, and can also enable cross-platform messages to Microsoft Teams.

API Testing

APIs are the backbone of digital interactions, and API testing is essential to prevent issues such as retrieving the wrong data, losing data, corrupting data, or system failure. API testing involves identifying the API endpoints, determining the API method and parameters, creating test cases, setting up the test environment, and executing the test cases. Katalon is an all-in-one test automation platform that can perform API testing for teams of any scale, at any engineering expertise, and supports all types of REST, SOAP/1.1, and SOAP/1.2 requests.

In conclusion, APIs are a fundamental aspect of our digital world, enabling seamless interactions between different applications and services. They play a crucial role in software development and are essential for creating engaging digital experiences on our phones and computers every day.

10 Popular API Examples: A Complete List (2024)

FAQs

What are some examples of an API? ›

Public API examples include social media bots, third-party login, e-commerce transactions, and weather apps. Private API examples include streaming services, ensuring media compatibility on various devices, and financial apps that connect different aspects of managing finances in a bank.

What is a good example of a REST API? ›

Social media sites like Twitter, Facebook use REST APIs to integrate with third-party applications and allow posting updates. Ridesharing apps like Uber and Lyft use REST APIs to coordinate cars, obtain maps, fares and location data.

What are the 3 types of APIs and give examples for each? ›

There are also three common types of API architectures:
  • REST, a collection of guidelines for lightweight, scalable web APIs.
  • SOAP, a stricter protocol for more secure APIs.
  • RPC, a protocol for invoking processes that can be written with XML (XML-RPC) or JSON (JSON-RPC).
Jan 16, 2023

What is a real life example of an API? ›

Every time you use an app such as Facebook or Instagram, check the weather or send an instant message, you're using an API. API examples are everywhere, in the applications you use on a daily basis.

What are the 4 types of API? ›

Four types of web APIs
  • Public APIs. A public API is open and available for use by any outside developer or business. ...
  • Partner APIs. ...
  • Internal APIs. ...
  • Composite APIs.
Jan 10, 2023

What is a common API? ›

CommonAPI C++ is a C++ framework for interprocess and network communication. The basic objective is not to provide a new mechanism for interprocess or network communication (IPC), but to define a high-level C++ API, which can be used for different mechanisms.

What is the most used Google API? ›

Best Google APIs for Marketers and Developers
  • Google Maps Platform.
  • Vertex AI.
  • Natural Language AI.
  • Vision AI.
  • Video AI.
  • Text-to-Speech and Speech-to-Text.
  • Translation AI.
  • Google Chat.
Sep 6, 2022

What type of API is Google? ›

Google APIs are application programming interfaces (APIs) developed by Google which allow communication with Google Services and their integration to other services. Examples of these include Search, Gmail, Translate or Google Maps.

What are the 4 most common REST API operations? ›

API is an acronym that stands for application programming interface. An API is a set of rules and specifications that software programs can follow to communicate with each other. The four most common REST API operations are create, read, update, and delete (CRUD).

What is SOAP API with example? ›

SOAP is the Simple Object Access Protocol, a messaging standard defined by the World Wide Web Consortium and its member editors. SOAP uses an XML data format to declare its request and response messages, relying on XML Schema and other technologies to enforce the structure of its payloads.

How many APIs are there in the world? ›

New estimates say the total number of public and private APIs in use is approaching a whopping 200 million. APIs are becoming increasingly crucial to the global digital economy. They are the backbone of many digital platforms and drive the composable enterprise model. But this ubiquity presents sprawl issues.

What is API testing in simple words? ›

API testing is a type of software testing that involves testing application programming interfaces (APIs) directly and as part of integration testing to determine if they meet expectations for functionality, reliability, performance, and security. Since APIs lack a GUI, API testing is performed at the message layer.

How many different APIs are there? ›

Four types of APIs by audience

A popular distinction is to categorize them by their intended audience, which gives us the following three categories: Open APIs, Partner APIs, and Internal APIs. We'll also add a bonus category, Composite APIs, which doesn't quite fit neatly into any of these groups.

What is an example of an API and how does it work? ›

Imagine you're a customer at a restaurant. The waiter (the API) functions as an intermediary between customers like you (the user) and the kitchen (web server). You tell the waiter your order (API call), and the waiter requests it from the kitchen. Finally, the waiter will provide you with what you ordered.

What is an example of an API product? ›

An API as a product example would be Twilio and Stripe, where your API is the product you're selling; and some companies have become very successful doing it.

How does an API looks like? ›

We can think of an API as being similar to a package or library in a programming language, but one that is usable from almost any programming language. In these terms, an endpoint is equivalent to a function; Numbers API provides a single function, / , which gives information about numbers.

Is Amazon an API? ›

Amazon API Gateway is a fully managed service that makes it easy for developers to create, publish, maintain, monitor, and secure APIs at any scale. APIs act as the "front door" for applications to access data, business logic, or functionality from your backend services.

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