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API Tutorials for Beginners: A Comprehensive Guide to Understanding APIs

April 29, 2023

Dive into APIs and see how everything’s connected with their help, no-code edition. This guide will help you understand the works behind APIs and how to start using them in your own no-code projects.

No-code and API for Beginners: a complete guide

Ladies and gentlemen, boys and girls, and all those in between, gather around!! Today, we’re talking about the big thing in software development: APIs (and a little bit about no-code, of course).

With no-code and proper APIs, anyone, and we mean anyone, can build their own apps without having to write a single line of code. That’s right, you don’t need to be a computer science whiz kid to build your own app anymore. 

In this guide, we’ll be covering everything you need to know APIs, from the basics of what they are and how they work, to the different tools available to help you get started. 

Introduction to APIs

If you've ever used Google Maps on a website or mobile app, you're actually using an API provided by Google that allows your application to access and display map data. Or, if you've ever used the Facebook or Twitter login button on a website, you're using an API that allows your app to authenticate users through those social media platforms.

The simplest stolen meme to explain how it works.

API definition

APIs have been around for decades. In fact, the concept of APIs can be traced back as far as the 1960s, when IBM introduced the concept of "System/360", which allowed different software to communicate with each other through a standardized interface. Over the years, APIs continued to evolve and become more sophisticated, as developers looked for ways to integrate different things together.

Humble beginnings in the 1960-70s.

But what exactly is an API, you might ask? At its core, an API is a set of protocols and standards that allow different software applications to communicate and interact with each other. It's like a universal language that allows programs to share data and work together seamlessly, without having to know the nitty-gritty details of how each one works.

One of the earliest and most well-known examples of APIs in action is the World Wide Web itself. The HTTP protocol, which forms the backbone of the web, is essentially an API that allows web browsers and servers to communicate with each other and transfer data back and forth. Without HTTP and other web APIs, the modern internet as we know it would simply not exist.

Another example of APIs in action is the rise of social media platforms like Facebook and Twitter. These companies have made their APIs available to developers, allowing third-party applications to access and use their data and functionality. This has led to the creation of a whole ecosystem of social media tools and apps, from Twitter clients to Facebook games, that would not have been possible without APIs.

Purpose of API

So, what makes APIs so powerful and important? For one, they allow developers to build applications much more quickly and efficiently by leveraging existing code and resources. Instead of having to reinvent the wheel with every new project, developers can simply tap into APIs provided by other developers and companies to add new features and functionality to their applications.

APIs also promote interoperability and standardization, making it easier for different software applications to work together seamlessly. This has helped drive innovation and collaboration in the software industry, leading to the creation of new and exciting applications that would not have been possible otherwise.

Main types of APIs

First up, we have web APIs, also known as REST APIs. These are the most common type of API, and they're used extensively in web and mobile applications. Web APIs use the HTTP protocol to transfer data between different applications, and they typically use standard data formats like JSON or XML to structure that data. One of the earliest and most influential web APIs was the Google Maps API, which allowed developers to embed Google Maps into their own websites and applications.

Next, we have operating system APIs. These are specific to a particular operating system, such as Windows or macOS. Operating system APIs allow developers to access and control various system functions and resources, like file I/O and system settings. They're typically used to build desktop applications or to interact with hardware devices like printers or scanners.

Another important type of API is the database API. These are used to access and manipulate data stored in databases like MySQL or MongoDB. Database APIs typically use SQL or another database-specific query language to interact with the data.

Finally, we have hardware APIs. These are used to interact with physical hardware devices like sensors or actuators. Hardware APIs are typically platform-specific and low-level, and they're used to build embedded systems or Internet of Things (IoT) applications. One example of a hardware API is the Arduino API, which is used to program and control Arduino microcontrollers.

Web APIs vs Web Services

Web Services and Web API are both are used to facilitate communication between the client and the server. 

The major difference between Web Services and Web API comes down to their communication style. Each of them requires a request body that is acceptable in a specific language. Additionally, they differ in their ability to provide a secure connection, their speed of communicating to the server and responding back to the client, and more.

Here are some of the key differences between Web Services and Web API:

Web Services:

  • Web Services generally use XML (Extensible Markup Language), which means they are more secure.
  • Web Services always need a network to operate.
  • Web Services are a subset of Web API, and are based only on three styles of use: SOAP, REST, and XML-RPC.
  • Web Services support "One Code different applications", meaning a more generic code is written across different applications.

Web API:

  • A Web API generally uses JSON (JavaScript Object Notation), which means it's faster than Web Services.
  • Web API does not necessarily require a network to operate.
  • Web APIs are the superset of Web Services, meaning all three styles of Web Services are present in the Web API as well, but it also uses other styles like JSON-RPC.
  • Web API may or may not support interoperability depending upon the nature of the system or application.

Importance of APIs

One major reason is that APIs allow for greater interoperability between different applications and systems. In the past, applications were often siloed and isolated from each other, making it difficult to share data or integrate functionality. APIs make it much easier for apps to work together, allowing developers to create new and innovative products that can leverage the power of multiple applications.

By building applications that are composed of multiple APIs, developers can take advantage of the specialized features and functionality offered by each API. This can result in faster development cycles, more efficient code, and a better end-user experience.

Understanding API endpoints

Now let's turn our attention to API endpoints. 


What are Endpoints

An API endpoint is a URL that represents a specific resource or service that is exposed by an API. Endpoints are used to define the structure and functionality of an API, and they can be divided into several different types.

Types of Endpoints

APIs come in a variety of types and forms, and each type serves a specific purpose. Here are some of the most common types of APIs:

REST-based APIs: This data-driven style of API development is based on Uniform Resource Identifiers (URIs) and the HTTP protocol. REST-based APIs use JSON for data formatting and are considered to be browser-compatible. They are simple to build and scale, making them an ideal option for beginners.

WebSocket: This type of API is ideal for two-way interactive communication sessions between the user's browser and a server. WebSocket APIs facilitate event-driven responses and enable easier management of sending messages to a server without having to poll the server for a reply. We know how to handle it in Directual too, it’s super easy.

SOAP-based APIs: These APIs use a type of protocol called Simple Object Access Protocol (SOAP), which makes them more accurate and secure in message exchange than REST-based APIs. However, they can be viewed as quite complex to use.

GraphQL-based APIs: This is an advanced set of web-based APIs that use an open-source data query and manipulation language. GraphQL makes it easier to form a definitive pathway for the runtime that fulfills queries with pre-existing data. Unlike REST APIs, GraphQL uses a single interface-id to organize data into a graph format.

XML-RPC: This API protocol is designed for transferring data using XML format and is simpler to use than SOAP-based APIs since it uses minimum bandwidth.

API Requests

Now let’s take a look at types of API requests.

HTTP Methods

Let's start with HTTP methods. HTTP (Hypertext Transfer Protocol) is the protocol used for communication between web servers and clients, and it includes several different methods that can be used to make requests and receive responses. Directual features an entire scenario designed to handle HTTP requests, too.

The most common HTTP methods are:

  • GET - retrieves information from the server
  • POST - sends information to the server to be processed and stored
  • PUT - updates existing information on the server
  • DELETE - removes information from the server

In addition to these, there are several other HTTP methods that can be used in specific situations, such as PATCH (for making partial updates to existing information) and OPTIONS (for retrieving information about the server's capabilities).

Example of Web APIs available at nasa.gov

Each HTTP method is used for a specific purpose, and they all play a critical role in the functioning of APIs. For example, GET requests are commonly used to retrieve data from a server, while POST requests are used to send data to a server, such as submitting a form or creating a new resource.

Types of Requests

There are two main types of requests that can be made using HTTP: synchronous and asynchronous.

Synchronous requests are the most common type of request and occur when the client sends a request to the server and waits for a response. This type of request is useful when the response is needed immediately and the client does not need to perform any other tasks while waiting for the response. You can create your own synchronous scenarios in Directual too, in just a few steps.

Asynchronous requests, on the other hand, are used when the client needs to perform other tasks while waiting for a response from the server. In this case, the client sends the request and continues to perform other tasks until a response is received.

Asynchronous requests can be particularly useful in situations where the server may take some time to process the request, such as when dealing with large amounts of data or complex operations. By allowing the client to continue performing other tasks while waiting for a response, asynchronous requests can help improve the overall efficiency and performance of an API.

Setting up an API Development Environment

Setting up an API development environment can seem daunting at first, but with the right tools and resources, it's actually quite straightforward.

Tools for API Development


Postman is an essential tool for API development, as it allows you to test your APIs and create requests fast. This powerful tool provides an intuitive user interface that allows you to create and save requests, and it even has a built-in request builder that simplifies the process of creating complex requests. You can use Postman to test various HTTP methods, set headers, and work with API endpoints. Plus, it supports multiple authentication methods, including OAuth 2.0 and API keys.

Fun fact: Postman was developed by Abhinav Asthana in 2012. He was inspired to create the tool after experiencing frustration with the API testing process at his previous job.


cURL is a powerful command-line tool that allows you to make HTTP requests from the command line. While it might not have the flashy interface of Postman, cURL is a great tool for developers who prefer to work in the command line. With cURL, you can make HTTP requests, set headers, and even send data with ease. It's a versatile tool that can be used for everything from testing APIs to debugging web applications.

Creating a Development Account

Before you start building your own APIs, you'll need to create a development account with the API provider. This will give you access to the API documentation and allow you to obtain an API key or authentication credentials.

Creating a development account is usually a simple process that involves providing some basic information, such as your name and email address. Once you've created an account, you'll have access to the API documentation, which will provide detailed information on how to use the API.

Understanding API Keys and Authentication

API keys and authentication are important concepts to understand when working with APIs. API keys are unique identifiers that are used to authenticate requests to the API. They help to ensure that only authorized users can access the API. 

Authentication is the process of verifying the identity of the user or application making the API request. There are several authentication methods used by APIs, including OAuth 2.0, API keys, and basic authentication.

Just to mention, Directual has it’s own secure authentication APIs you can readily use in your projects too.

Making Your First API Call

Moving on trying to do it yourself. Exciting!

Endpoint URL

So, let's start with the basics. The first thing you need to know when working with APIs is the endpoint URL. This is the address of the server you're trying to communicate with. For example, let's say you wanted to get weather data from a website. The endpoint URL might look something like this: 


The numbers at the end represent a specific location you're interested in, and the "/v1/currentconditions/" part indicates what type of data you want.

HTTP Method

Next, you need to specify the HTTP method you want to use. This tells the server what action you want it to take. There are several HTTP methods to choose from, but the most common are GET, POST, PUT, and DELETE. In most cases, you'll be using GET to retrieve data from the server.

Query Parameters

Now, let's talk about query parameters. These are additional parameters you can add to your API call to refine your request. For example, if you wanted to get weather data for a specific date and time, you might add a query parameter like this: 


The question mark indicates the start of the query parameters, and each parameter is separated by an ampersand (&).

Have a look at a comprehensive lesson what are request query params and how to use them building your API.

Understanding API Responses

When you make an API call, the server will send back a response in JSON format (most of the time). This response will contain all the data you requested, as well as some additional metadata about the request. You must have a clear understanding of the structure of the JSON response so you can parse it correctly in your code.

Now, I know this might all sound a bit confusing at first, but don't worry! There are plenty of tools and resources available to help you get started with APIs. In fact, many websites and services provide documentation and sample code to help you make your first API call.

If you’d like to learn more how it works in Directual, we have an entire 101-course ready for you. You’ll learn how to build a modern REST API using a powerful no-code API builder.

Working with API Data

Now let’s take a look at how properly process API data.

JSON and XML Formats

JSON and XML. JSON, or JavaScript Object Notation, is a lightweight data-interchange format that is easy for humans to read and write and easy for machines to parse and generate. It's become the standard for web APIs, and for good reason. XML, or Extensible Markup Language, is also widely used in web APIs, but it's a bit more verbose and cumbersome than JSON. Nonetheless, it's still important to know how to handle XML data returned from APIs.

Parsing API Responses

When you make an API call, the response you receive will be in JSON or XML format, and it will contain a lot of data. Sometimes, you may only need certain pieces of data from the response. That's where parsing comes in. Parsing is the process of extracting the data you need from a larger set of data. Think of it like sifting through a big pile of sand to find the gold nuggets.

To parse API responses, you'll need to use a programming language like Python or JavaScript. Both languages have built-in libraries for handling JSON and XML data. With Python, you can use the json module to parse JSON data and the xml.etree.ElementTree module to parse XML data. With JavaScript, you can use the JSON.parse() function to parse JSON data and the DOMParser() function to parse XML data.

Updating and Deleting Data with APIs

Parsing data isn't the only thing you can do with APIs. You can also update and delete data using APIs. 

Say you have a database of customer information, and you want to update a customer's address. You can use an API to send a PUT request with the updated information to the server, which will then update the database with the new address. Similarly, you can use an API to send a DELETE request to remove a customer's information from the database.

Best Practices for API Development

Developing an API that meets industry standards requires more than just setting up an environment and writing some code. It also involves implementing secure access control, handling errors effectively, and documenting the API properly.

Security and Access Control

Security is a critical aspect of API development, as APIs often handle sensitive data. You'll want to ensure that only authorized users can access your API, and that any data transmitted is encrypted. 

To achieve this, you'll need to implement access control mechanisms, such as API keys, OAuth, or JSON Web Tokens (JWTs). These mechanisms help to prevent unauthorized access to your API by requiring clients to provide valid credentials before accessing protected resources.

Error Handling

First and foremost, you'll want to ensure that error messages are clear and concise. The error message should provide enough information to help the client understand the issue and how to resolve it. Additionally, it's important to use appropriate HTTP status codes when returning error messages. HTTP status codes provide information about the status of the request and can help the client determine the appropriate course of action.

Documenting APIs

Proper documentation is essential for helping clients understand how to use your API. You'll want to provide detailed documentation that explains the purpose of each resource, how to authenticate, and the expected response format. Additionally, you should provide examples of how to use the API, including sample requests and responses.

In terms of documenting APIs, there are several best practices to keep in mind. First, you'll want to ensure that the documentation is easily accessible and well-organized. This means using clear and concise language, organizing resources logically, and providing a search function. Additionally, it's important to keep the documentation up-to-date. As your API evolves, you'll want to ensure that the documentation reflects any changes.

Implement error handling mechanisms that help clients understand the nature of the error and how to resolve it. One common approach is to include error codes or error messages in the response. These messages should be specific and provide enough information to help the client understand what went wrong and how to fix it.


We've reached the end of our journey through the world APIs for beginners. It's been quite the adventure, and I hope you've learned a lot along the way. APIs are a crucial tool for developers and businesses alike. They allow different software systems to communicate with each other, creating a seamless user experience and unlocking new possibilities for innovation.

By using APIs with no-code platforms, you can easily integrate different systems and create complex workflows that would otherwise require hours of coding. Now, as you look to continue your learning journey, we have a few final thoughts and recommendations. 

Firstly, we highly recommend that you experiment with different no-code tools and APIs to see what works best for you. There's no one-size-fits-all solution, so it's important to find the right combination of tools that suits your needs.

Secondly, don't be afraid to ask for help. There's a huge community of developers and no-coders out there (just look in the footer of this page for our communities, or send us a message to hello@directual.com) who are always happy to share their knowledge and experience. So if you're stuck on a particular problem or just need some advice, reach out and see what help is available.

And finally, keep learning! The world of technology is constantly evolving, and there are always new tools and techniques to discover. Whether it's attending webinars, reading blogs, or taking online courses, there's always something new to learn that can help you take your no-code and API skills to the next level.


Are APIs easy to learn?
Are APIs easy to learn?

That really depends on your level of experience with coding and software development. If you're already familiar with programming languages and software architecture, learning APIs shouldn't be too difficult. However, if you're new to coding, it might take some time to get the hang of it. But don't worry! There are plenty of resources out there to help you learn, so just take it one step at a time.

What is the easiest API to learn?
What is the easiest API to learn?

That's a tough one, because every API is different and there's no one-size-fits-all answer. However, some APIs are designed to be more user-friendly and easier to learn than others. For example, the Twitter API is a popular choice for beginners because it has clear documentation and a straightforward authentication process.

Where do I start learning API?
Where do I start learning API?

There are a ton of great resources out there, including online courses, tutorials, and documentation from API providers. Some popular learning platforms include Udemy, Coursera, and Codecademy. Also, check out the API-related courses and lessons of Directual no-code academy.

What skills are needed for API?
What skills are needed for API?

At a minimum, you should have a solid understanding of programming languages like JavaScript, Python, or Ruby. You should also be familiar with concepts like RESTful APIs, JSON, and HTTP requests. Have a look how to deal with JSON using no-code.

What is API developer average salary?
What is API developer average salary?

That can vary depending on location, experience, and job responsibilities, but according to Glassdoor, the average salary for an API developer in the United States is around $85,000 per year.

What is the best language to build an API?
What is the best language to build an API?

Some popular languages for building APIs include Python, Ruby, and Node.js. Ultimately, the most important thing is to choose a language that you're comfortable with and that can meet the requirements of your project. Don't forget that you can easily create API using no-code tools like Directual database and API builder.

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