This article defines API and offers a succinct exploration of what APIs do, how they work, and how readers can use them, including getting into back-end development.
API stands for application programming interface. An API is a set of protocols and instructions written in programming languages such as C++ or JavaScript that determine how two software components will communicate with each other. APIs work behind the scenes to allow users to locate and retrieve the information they request.
Think of APIs like contracts that determine how two software systems will interact. Consider a few examples of APIs in action and how a website owner or administrator might use APIs in the following situations:
The YouTube API allows you to add videos to your website or app, as well as manage your playlists and subscriptions.
The Facebook API for conversions allows you to track page visits and conversions, as well as provide data for ad targeting and reporting.
The Google Maps API allows you to embed static and dynamic maps, as well as street view imagery, on your website.
As an internet user, you’ve most likely experienced the convenience API technology enables when browsing a website or using a mobile app. Let’s apply the above examples to the user experience. Anytime you land on a site and watch a video, see an ad on Facebook related to a website you recently visited, or use the map on a business’s website to find its physical location, chances are an API has been at work to make this experience possible.
Now that you have an API definition, the next step is to become familiar with the different types of APIs.
Open APIs, also known as external or public APIs, are available for anyone to use and integrate with their sites or apps.
Partner APIs are also considered external, but you can use them only if you have a business relationship with the companies providing them.
Internal APIs, also called private APIs, are used by people within a company and help to transfer data between teams or connect different systems and apps. Third parties do not access internal APIs like they do with open or partner APIs.
Composite APIs combine multiple APIs from different servers or data sources to create a unified connection to a single system.
SOAP stands for simple object access protocol. This protocol determines how to transmit data across networks, how messages should be sent, and what the messages should include.
REST stands for representational state transfer. It’s a set of guidelines for scalable APIs that are easy to use when transferring data securely.
RPC stands for remote procedural call. RPC APIs execute code on remote networks.
To find out more about different types of APIs, watch this video from the Meta Back-End Developer Professional Certificate.
Most web APIs function as follows:
1. The user performs a task on a website or app, such as clicking a video to watch it.
2. This action tells the site or app to initiate an API call, which means to submit a request to the API for information from the external server or program.
3. The API then retrieves the requested data and delivers it back to the app, so the user has the expected experience.
Cloud APIs enable cloud applications to communicate with one another. As organizations deploy more programs and services on the cloud, cloud APIs will become more vital to how we use the internet.
The use of APIs is increasing. They benefit businesses, users, and developers in the following ways:
Businesses can access and share content from other software systems.
A company’s employees can work faster on tasks and collaborate more easily with coworkers.
Internet searchers can find information and interact with sites easily.
External users of apps and digital products can enjoy seamless customer experiences.
Developers can often build upon or modify existing APIs, rather than having to create entirely new ones, to deliver value to customers more efficiently.
APIs provide security, so data from one device or server is never fully exposed to another.
A logical place to start in API development is to enroll in an introductory course or certificate program, such as the Meta Back-End Developer Professional Certificate. By enrolling in this program or similar ones like IBM's Full Stack Software Developer Professional Certificate, you can build essential skills in programming languages, front-end development, back-end development, and API coordination, as well as explore the different uses for APIs.
You’ll also want to familiarize yourself with different API tools such as Postman, Akana, and Swagger.
Once you are comfortable with skills and tools, your next steps would include:
Designing and developing APIs
Testing each API’s function
Publishing your APIs
Creating thorough documentation to encourage their adoption
Monitoring their performance, in terms of engagement
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Scaffolding refers to creating a temporary structure for your project that you can use when developing more complex projects.
An API call refers to submitting a request to an external server asking an API for information or to provide a service. An API call includes an API key, or access token. The key grants or denies a client access to the information or service requested and can track the number of requests or calls made.
An API key is a code, or unique alphanumeric string, used for authentication and authorization. API keys can authenticate the identity of a user making the API call and authorize them to make the request. An API key can also authenticate the identity of a specific project or application making a call, as well as authenticate whether the project or application has access to make the call. You can find API keys through white-labeled internal marketplaces and other platforms.
An API endpoint is a digital location where an API receives requests from clients to access information, a resource, or a service. The endpoint is usually a URL (uniform resource locator) that corresponds to the location of a resource on a server.
An API gateway is one component of an API management system. It intercepts all incoming requests or calls to a server and sends them through the management system. Some API gateways can handle tasks like authenticating users, tracking the number of requests, breaking API calls into multiple requests, and producing responses.
This content has been made available for informational purposes only. Learners are advised to conduct additional research to ensure that courses and other credentials pursued meet their personal, professional, and financial goals.