# How Fuzz Testing for APIs Is Evolving

DevFeed: [How Fuzz Testing for APIs Is Evolving](<https://devfeed.tech/articles/how-fuzz-testing-for-apis-is-evolving-12650.md>)

Original publisher: [Read original article](<https://nordicapis.com/how-fuzz-testing-for-apis-is-evolving/>)

Author: J Simpson

Published: 2026-08-21T07:00:00Z

Content type: article

Language: en

Sources: [Nordic APIs](<https://devfeed.tech/sources/nordic-apis.md>)

Topics: [Testing](<https://devfeed.tech/topics/testing.md>), [API](<https://devfeed.tech/topics/api.md>), [Large Language Model](<https://devfeed.tech/topics/llm.md>), [Security](<https://devfeed.tech/topics/security.md>), [HTTP](<https://devfeed.tech/topics/http.md>)

Tags: [api-security](<https://devfeed.tech/tags/api-security.md>), [api-testing](<https://devfeed.tech/tags/api-testing.md>), [api-vulnerabilities](<https://devfeed.tech/tags/api-vulnerabilities.md>), [apis](<https://devfeed.tech/tags/apis.md>), [artificial-intelligence](<https://devfeed.tech/tags/artificial-intelligence.md>), [blog](<https://devfeed.tech/tags/blog.md>), [http](<https://devfeed.tech/tags/http.md>), [llm](<https://devfeed.tech/tags/llm.md>), [llms](<https://devfeed.tech/tags/llms.md>), [open-source](<https://devfeed.tech/tags/open-source.md>), [openapi-specification](<https://devfeed.tech/tags/openapi-specification.md>), [rest](<https://devfeed.tech/tags/rest.md>), [security](<https://devfeed.tech/tags/security.md>), [testing](<https://devfeed.tech/tags/testing.md>), [validation](<https://devfeed.tech/tags/validation.md>)

## AI overview

The article examines how API fuzz testing is evolving through the use of LLMs, OpenAPI Overlay, and automated security testing. It highlights the importance of generating suitable test data so HTTP requests can pass input validation and reach deeper security checks.

## Source excerpt

Ahead of Nordic APIs Summit 2026, we check in with speaker Andrea Arcuri on how fuzz testing for APIs is evolving. "You cannot really check security properties if all your HTTP calls fail with a 4xx because your techniques can't generate the right test data to pass the first layer of input validation," answers Andrea ...