Cypress API Testing: A Comprehensive Guide

When apps crash, people blame the interface. But developers are aware that most bugs reside deeper in the APIs. They cause flaky demeanor, load problems, or consummate failure. Manual API assay make liberation rhythm slower. What teams motivation are speed, confidence, and low-maintenance exam.

Cypress has go a favorite due to its dependableness and fastness. But, its features are underutilized.

Cypress can execute GET, POST, PUT, and DELETE requests with built-in assertions and robust chaining.

This guide explains how Cypress makes API testing true and fast.

What is an API? (Purpose of API testing)

API & # 8211; Application Program Interface is a way in which two different software components communicate.

• For example, you interact with remote devices in BrowserStack from the BrowserStack website with the help of API. It acts as a medium for communicating between two different software components.
• When a product is being developed, you won ’ t receive a to validate the front-end part.
• But with API testing, you can formalize the response you will get in the front end when the product is being developed.

Understanding API Testing

API testing is important in modern software ontogeny. It tests the functionality, reliability, performance, and security of application programming interface (APIs).

APIs play the role of a middleman, enabling various software systems to transmit with one another and exchange information. Testing them insure they do as expected under varying conditions, handle errors decent, and maintain performance standard.

Unlike traditional user interface testing, API try occurs at the message layer, so issues can be caught betimes. It enable smooth, continuous integration and delivery exercise.

With API testing, development teams can identify and correct shortcoming early in the development process. This saves late-stage bug neutering and delivers a seamless exploiter experience. The exercise is most utile in agile and cultures, where speedy iterations and deployments are the average.

Setting up the Environment

To get part with Cypress, follow the below steps:

1. Create a folderwhere you would like to store and execute the scripts.

2. Open the terminaland set up the node project with the command, which will create package.json file with default value.

npm init -y

3. Execute the bid, from the same folder in the terminal.

npx cypress install

4. Now the installation will be complete, and then the Cypress application will seem on the screen.

For accomplish Cypress API testing, you don ’ t need to install any additional packages as Cypress itself has the capacity of treat API requests and responses.

Writing your first Cypress API exam

• To create an API request, provides an inbuilt bid calledcy.request ().
• With this command, Cypress will create an HTTP request on behalf of the web covering and get the response from the API waiter.
• When the API request is successful, you will get the response condition as 2xx.

Syntax

cy.request (method, URL, body)

In the above command, method, and body are optional but the URL is mandatory.

cy.request (options)

In the above command, the argumentation options should be in the form of object

Making HTTP Request with Cypress

Make a simple GET request with cy.request () command. You will make a GET asking to the postdate URL & # 8211;https: //www.bstackdemo.com/with the below piece of code,

describe ('template specification ', () = & gt; {it ('passes ', () = & gt; {//Getting response from BrowserStack demonstration site cy.request ('GET ', 'https: //www.bstackdemo.com/ ')})})

You can regard the request ’ s response from the console log of the Cypress runner by inspecting it.

Assertions in Cypress API testing

Now, go ahead and try to swear the API response. When you hit the API server with the URL, if you get a response status of 200, you can say that the asking you passed succeed.

Try to swan the response status codification with the below part of codification:

describe ('template spec ', () = & gt; {it ('passes ', () = & gt; {//Getting answer from browserstack demo website cy.request ('GET ', 'https: //www.bstackdemo.com/ ') .then ((response) = & gt; {//Expecting the response status code to be 200 expect (response.status) .to.eq (200)})})})

With this, you will be capable to assert whether the response code which you got back is 200 or not.

Advanced Cypress API quiz

Here is the tilt of several method supported by Cypress:

GET, POST, PUT, DELETE, PATCH, HEAD, OPTIONS, TRACE, COPY, LOCK, MKCOL, MOVE, PURGE, PROPFIND, PROPPATCH, UNLOCK, REPORT, MKACTIVITY, CHECKOUT, MERGE, M-SEARCH, NOTIFY, SUBSCRIBE, UNSUBSCRIBE, SEARCH, CONNECT.

Try to execute them one by one, with a help of an external booby API website & # 8211;https: //dummy.restapiexample.com/

With the below piece of code, you can execute POST, PUT, PATCH and DELETE request and understand it more clearly

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describe ('template spec ', () = & gt; {//This block inserts the data which is mentioned in the body of the request it ('POST request ', () = & gt; {cy.request ({method: 'POST ', url: 'https: //reqres.in/api/users ', body: {'' name '': `` Bingo '', '' job '': `` Team Pb ''}}) .then ((response) = & gt; {//Asserting the status codification to be 201 for successful execution expect (response.status) .to.eq (201) //Asserting the name which you have tuck into expect (response.body.name) .to.eq (`` Bingo '') //Asserting the status text to confirm whether it is created expect (response.statusText) .to.eq (`` Created '')})}) //This cube will execute PUT request it ('PUT request ', () = & gt; {cy.request ({method: 'PUT ', url: 'https: //reqres.in/api/users/2 ', body: {'' name '': `` Angel '', '' job '': `` zion resident ''}}) .then ((response) = & gt; {//Asserting the status code to be 200 for successful execution expect (response.status) .to.eq (200) //Asserting the name which you experience inserted into expect (response.body.name) .to.eq (`` Angel '')})}) //This block will execute the PATCH request and update the disc it ('PATCH request ', () = & gt; {cy.request ({method: 'PATCH ', url: 'https: //reqres.in/api/users/2 ', body: {'' name '': `` Angel '', '' job '': `` Israel resident ''}}) .then ((response) = & gt; {//Asserting the status codification to be 200 for successful performance expect (response.status) .to.eq (200) //Asserting the name which you get inserted into expect (response.body.name) .to.eq (`` Angel '')})}) //This block will delete the user which be it ('DELETE request ', () = & gt; {cy.request ({method: 'DELETE ', url: 'https: //reqres.in/api/users/2 '}) .then ((response) = & gt; {//Asserting the status codification to be 204 for successful execution look (response.status) .to.eq (204)})})})

Cypress vs Other API Testing Tools

While Cypress is primarily a frontend testing instrument, it offers potent support for API testing. Here & # 8217; s how it compares with consecrated API testing tools:

Running Cypress API Tests in CI/CD Pipelines

​Integrating Cypress API tests into CI/CD pipelines ensures consistent substantiation of your application & # 8217; s functionality with every codification alteration. This approaching heighten reliability, accelerates feedback loops, and supports agile development practices.​

1. Installation and Configuration

Install Cypress as a development habituation:

npm install cypress -- save-dev

Add test scripts to your package.json:

`` scripts '': {'' test '': `` cypress run ''}

2. CI/CD Integration

Depending on the corroboration of the CI/CD tool you use, configure it to include Cypress in the workflow:

• GitHub Actions:Utilise the official Cypress GitHub Action to run tests on push or pull petition events.​
• GitLab CI/CD:Configure .gitlab-ci.ymlto include Cypress exam stages. Use official Cypress Docker images for a consistent environment.
• CircleCI:Implement Cypress tests using CircleCI Orbs for streamlined configuration
• Azure DevOps:Integrate Cypress tests by adding npm tasks in your grapevine configuration.
• Jenkins: Set up Cypress tests within Jenkins pipelines utilise npm scripts and appropriate plugins.

3. Running Tests in Parallel

Cypress supports parallel test execution to reduce overall testing time. Utilise the & # 8211; parallel flag in connective with the record option and a valid projection key: ​

npx cypress run -- record -- key & lt; your_project_key & gt; -- collimate

4. Environment Variables and Secrets

Manage sensitive data and environment-specific configurations using surroundings variables. In CI/CD platforms, set these variables securely to forestall exposure.​

5. Caching and Dependencies

Implement caching strategies for dependencies and Cypress binaries to speed up the pipeline execution. Most CI/CD program support caching mechanics to store and restore colony between runs.

Advantages of Cypress for API Testing

Cypress offers several advantages for API testing, making it a favourite choice for many ontogeny and QA teams. Its desegregation capabilities, real-time feedback, and developer-friendly characteristic streamline the testing process. Some of its benefit are:

1. Unified Testing Framework:Cypress back both frontend and API try under one umbrella. This permit for easier testing, as squad can write and maintain tests with less effort.

With the same puppet utilize to accomplish assorted quiz requirements, teams can ensure consistency and minimize the overhead of have to address with various

2. Real-Time Reload and Debugging:Cypress offers real-time reloading, whereby test are instantly updated as one makes changes. This functionality quicken development and debugging effectiveness with the power to provide instant feedback on code change.

Cypress farther let pausing and examining app province for effective debugging, thereby making bug-fixing easier.

3. Rapid and Compliant Test Run:Cypress has a high-speed test executing, which cut flakiness and gives rapid feedback to developers. This is critical in uninterrupted integration and speech pipelines.

4. Assertions and Commands Built-In:Cypress provides a comprehensive list of built-in statement and bidding specifically for use in API testing.

These simplify examination authoring and direction so that the tests can be written more directly and easily maintain.

5. Automatic Waiting Mechanism:Cypress has an machinelike waiting lineament that await on commands and averment before proceeding.

This assist decrease the quantity of manual waits and timeouts, make more stable and trusty tests.

6. Execution;Cypress allow you to execute tests in analogue, which can speed the testing procedure, particularly for declamatory test suites. This characteristic is utilitarian in continuous integration scenarios where time efficiency is important.

7. Simplified Syntax:Cypress relies on JavaScript for testing, which most developers are comfortable with.

Its clean syntax and corroboration ensure simplicity of learning, shortening the learning time for new team members.

8. Comprehensive Test Coverage:With Cypress, teams can provide complete test coverage by combining API, UI, and.

This full-picture strategy extensively test every area of the covering, resulting in high-quality software.

Challenges in Cypress for API Testing

Although Cypress offers numerous reward when it comes to API examination, it likewise arrive with disadvantage that may restrict its use on specific task. Acknowledging such limitation is essential in make informed decisions while using Cypress with your test environs.

1. Browser Dependency:Cypress executes within a browser environment still when executing API examination. While useful for frontend testing, this enclose additional overhead for test cases regard the backend exclusively.

A headless or command-line approach would likely be more appropriate in these cases as it would not have the additional resource overhead of the browser.

2. Limited Cross-Browser Support:Cypress only endorse a little number of browser, such as, Edge,, etc.

Cypress do not back or Internet Explorer, which could be a problem for extremely cross-browser-dependent applications. Test teams with those browsers would need to potentially govern out Cypress from consideration due to its limitations.

3. Limited Mobile Testing Capabilities:Cypress can not test native mobile applications. While it can also simulate mobile viewports within a browser, it has no means of gain native mobile features or testing on actual mobile devices and emulators.

This could be a big limitation to those teams that like to test mobile functionality along with their API workflow.

4. No Multi-Tab or Multi-Window Support:Cypress has no support for testing in multiple browser tabs or windows.

This is a limitation for applications establish on multi-tab or multi-window interactions, such as applications requiring testing of feature like pop-ups or links to external page. This limitation can make it harder to test complex user workflows across many browser contexts.

5. JavaScript-Centric Framework:Cypress is technically design to target JavaScript and TypeScript. While that is good plenty for teams that act in those languages, it may not necessarily be ideal for teams that use other language, such as Python. Such squad may discover it more difficult to implement Cypress in their test suites as it involves a encyclopaedism bender.

6. Performance Impact:Running tests inside a browser is resource-intensive, especially when dealing with tumid trial set or running tests in analog.

This can have an impact on performance and create continuous integration pipeline less efficient if tests are run at scale. Groups will want to optimize the examination configuration in order to avoid potential slowdowns.

7. Limited Community Support:Compared to more established quiz libraries, Cypress boasts a less launch community. While active and turn, there are fewer imagination, plugins, and support from the community.

This makes development and trouble-shoot potentially slower because there may be few examples or solutions to refer to when erroneousness come. Users of Cypress may find that it takes longer to resolve issues or customize the tool to their specific motivation.

Best Practices for Cypress API testing

When you have an API call which needs to be called across many, then you can create your own usage command with Cypress and use it across many specification file. For example,

• First store the API URL as an environment variable to admission it across file withCypress.env () command.
• To store this URL as a variable, add the below aim insidecypress.config.js file,

env: {myURL: `` https: //reqres.in/ ''}

• Create a custom dictation inside /support/commands.js file like below,

//You are creating a custom bid named GETrequest which has URL and userDataLink as argument Cypress.Commands.add ('GETrequest ', (url, userDataLink) = & gt; {//Usual GET asking command cy.request ('GET ', ` $ {Cypress.env (url) +userDataLink} `)})

• You can use this custom command inside you spec file and get the API response stored in a variable.
• The complete working spec file, will look like below,

describe ('template spec ', () = & gt; {it ('passes ', () = & gt; {//Get the API petition with URL and exploiter details controversy and shop response in a variable identify details cy.GETrequest ('myURL ', '' api/users/2 '') .as ('details ') //With cy.get () formalise the status code of response cy.get (' @ details ') .its ('status ') .should ('eq',200)})})

Real-World exemplar of Cypress API testing

Go farther on prove API, by get an API GET request call to weather API, get their response, and do assertion with it.

For this step, you may need to sign-up for theconditions API website, create your own story and get the API access key.

Inside cypress.config.js file, paste your access key under an object named env as below,

const {defineConfig} = require (`` cypress ''); module.exports = defineConfig ({e2e: {setupNodeEvents (on, config) {// implement node case listeners here}, env: {access_key: `` & lt; your_access_key & gt; ''}},});

Then, you can import this access key inside our test script and create an API call with the assist of below script,

describe ('template spec ', () = & gt; {it ('passes ', () = & gt; {cy.request ({method: 'GET ', url: 'http: //api.weatherstack.com/current ', qs: {//Access key given by the website access_key: Cypress.env ('access_key '), //Name of the city for which you are watch temperature query: `` Chennai ''}}) .then ((reply) = & gt; {//Asserting the status code to be 200 for successful reaction require (response.status) .to.eq (200) //Asserting the location name expect (response.body.location.name) .to.eq ('Chennai ')})})})

With this above part of code, you will be able to get the API response, assert the reply status codification and also assert its location name in the answer.

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Testing a GraphQL API with Cypress

GraphQL is a query language for API. To test GraphQL API, you will use another external site & # 8211;star-wars-swapi. By hitting the GraphQL API they cater, you will get the list of Star Wars movies.

Here is the working codification:

describe ('template spec ', () = & gt; {it (GraphQL petition, () = & gt; {//Making a POST asking to the yield URL cy.request ({method: 'POST ', url: 'https: //swapi-graphql.netlify.app/.netlify/functions/index ', body: {//Query argument which needs to be legislate for GraphQL query: ` query Query {allFilms {films {title director releaseDate speciesConnection {species {name classification homeworld {gens}}}}}} `}}) .then ((response) = & gt; {//Asserting the status code to be 200 for successful reaction expect (response.status) .to.eq (200) cy.log (response)})})

You will note that, the sole dispute which you have between the usual REST API and GraphQL API is the query part. You need to pass the body asking as a query.

Conclusion

With the above explanations, you will be able to understand the different method of API testing, performing assertions for API testing with Cypress, best praxis for Cypress API testing, real-world examples of API testing, and performing API testing for GraphQL API.

With, teams can run Cypress-based API tests across 3500+ real device-browser combinations, validating frontend-backend integrations with accuracy and speed. It ’ s an ideal solution for scale Cypress API tests without the Cypress Dashboard, while ensuring tests reflect real-world behavior and performance.

Browserstack provides you with a robust substructure to test on multiple devices with Cypress for:

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