Test and validate the REST APIs for your web applications.

Custom Headers


Request Headers

Response Headers

Response Body

Test your REST APIs

We make APIs great

We take the pain out of working with APIs. APIs can be a hassle, but we're here to make it easy for you. With our tools and expertise, you'll be able to get the most out of your APIs and make them work for you.

Accelerate API Quality

A well-designed API can accelerate your development process by making it easier for your team to use and maintain your code. With our REST API tester you can easily test REST API's in your application and fix issues.

Unlimited API tests

Our online REST API tester makes it easy to test any number of APIs. It is completely free and secure to test APIs with us, there are no limits or charges. We do not store any data since we process everything on the client side.

FAQs about REST API Tester

What is an API?

An Application Programming Interface (API) is a set of programming instructions that specify how software components should interact. It provides a way for different software programs to communicate with each other.

An API can be used to create new features or functionality in an existing software program. For example, a software developer could use an API to create a new feature in a gaming app.

What are the different types of API?

There are three different types of APIs for different purposes.

  1. Public API - Public APIs are APIs that are open for anyone to use. They usually have well-documented rules and procedures for how to access and use them. Many public APIs are provided by large companies, such as Google, Facebook, and Twitter.
  2. Private API - Private APIs are not made publically available for anyone to use. They are only made available to select developers or groups, usually under an agreement that restricts how the API can be used.
  3. Partner API - Partner APIs are a way for two companies to team up and create a stronger, more comprehensive product. By teaming up, each company can focus on their own strengths and create a product that is greater than the sum of its parts.
What is a REST API?

A REST API is an interface that allows you to access and manipulate data over the internet. It is a popular way to access data from web-based applications, and is typically used to exchange data between different systems. REST APIs are based on the HTTP protocol, and use simple URL structures to access data.

What is an API testing?

An API testing is a type of software testing that focuses on the determination of the correctness, quality, and performance of application programming interfaces (APIs). It involves testing the functionality, reliability, and security of an API. API testing is a critical part of the software development process as it helps to identify problems early on in the development cycle.

Why is API testing important?

API testing is important because it can help to ensure that the various components of a system work together as expected. By testing the API, developers can catch errors early on in the development process, which can save time and money.

API testing can be used to test both the functionality of an API and the performance of an API. Functional testing assesses whether an API can perform its expected tasks. Performance testing assesses whether an API can handle the expected load.

Both functional and performance testing are important in order to ensure that an API is able to meet the needs of its users. API testing is an essential part of the development process and should not be overlooked.

Is there any tool to test REST API online for free?

Yes, you can easily test your API with the help of the online tool REST API tester which is completely free to use.

How can I use the REST API Tester tool?

It is very simple to use, follow the below steps to use the REST API tester tool:

  1. Enter the REST API information such as the Method name, User-agent and the REST API endpoint in the required fields.
  2. Click on the "Test" button.
  3. The request and response headers along with the response body will be displayed.
  4. You can clear the results by clicking on the "Clear" button.
Does my data gets stored in this REST API tester tool?

Since all the REST API tests will be performed on the client-side, your data will never be stored in our tool.

Free Tools by Atatus

Instant visibility into the performance and health of your software.

Try Atatus's features free for 14 days. No credit card required.