> ## Documentation Index
> Fetch the complete documentation index at: https://rootea.es/llms.txt
> Use this file to discover all available pages before exploring further.

# API Testing

> Cross-platform resources for API Testing: curated HTB machines, PortSwigger labs and TryHackMe rooms with validated writeups and related skills.

# API Testing

This page aggregates **cross-platform resources to practice API Testing**: retired Hack The Box machines, PortSwigger Web Security Academy labs and TryHackMe rooms, plus curated resources (HackTricks, PortSwigger, etc.) and related skills.

## Curated resources

| Source      | Link                                                                                                 |
| ----------- | ---------------------------------------------------------------------------------------------------- |
| PortSwigger | [https://portswigger.net/web-security/api-testing](https://portswigger.net/web-security/api-testing) |

## PortSwigger labs practicing API Testing (5)

| Lab                                                                                                                                                                                         | Difficulty                                                 | Topic       | Official                                                                                                                                                |
| ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------- | ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [Exploiting an API endpoint using documentation](/en/portswigger/labs/api-testing/exploiting-api-endpoint-using-documentation)                                                              | <span className="dbadge dbadge-easy">APPRENTICE</span>     | API Testing | [Open](https://portswigger.net/web-security/api-testing/lab-exploiting-api-endpoint-using-documentation)                                                |
| [Exploiting server-side parameter pollution in a REST URL](/en/portswigger/labs/api-testing/server-side-parameter-pollution-exploiting-server-side-parameter-pollution-in-rest-url)         | <span className="dbadge dbadge-easy">APPRENTICE</span>     | API Testing | [Open](https://portswigger.net/web-security/api-testing/server-side-parameter-pollution/lab-exploiting-server-side-parameter-pollution-in-rest-url)     |
| [Exploiting a mass assignment vulnerability](/en/portswigger/labs/api-testing/exploiting-mass-assignment-vulnerability)                                                                     | <span className="dbadge dbadge-medium">PRACTITIONER</span> | API Testing | [Open](https://portswigger.net/web-security/api-testing/lab-exploiting-mass-assignment-vulnerability)                                                   |
| [Exploiting server-side parameter pollution in a query string](/en/portswigger/labs/api-testing/server-side-parameter-pollution-exploiting-server-side-parameter-pollution-in-query-string) | <span className="dbadge dbadge-medium">PRACTITIONER</span> | API Testing | [Open](https://portswigger.net/web-security/api-testing/server-side-parameter-pollution/lab-exploiting-server-side-parameter-pollution-in-query-string) |
| [Finding and exploiting an unused API endpoint](/en/portswigger/labs/api-testing/exploiting-unused-api-endpoint)                                                                            | <span className="dbadge dbadge-medium">PRACTITIONER</span> | API Testing | [Open](https://portswigger.net/web-security/api-testing/lab-exploiting-unused-api-endpoint)                                                             |

***

← [Back to the full glossary](/en/glossary)

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*Last updated: 2026-05-08*