Homepersonal website of Matthias Kecklhttps://keckl.com/JSON:API, PATCH and Idempotencyhttps://keckl.com/blog/03-jsonapi-patch-and-idempotency/https://keckl.com/blog/03-jsonapi-patch-and-idempotency/A practical look at JSON:API update modeling, PATCH vs PUT, and why HTTP method semantics matter under network failure.Tue, 07 Apr 2026 00:00:00 GMTWhy Semantic HTTP Conformance Mattershttps://keckl.com/blog/02-what-is-semantic-http-conformance-and-why-it-matters/https://keckl.com/blog/02-what-is-semantic-http-conformance-and-why-it-matters/Why semantic HTTP conformance is essential for reliable, agent-friendly APIs.Sun, 05 Apr 2026 00:00:00 GMTThymianhttps://keckl.com/projects/thymian/https://keckl.com/projects/thymian/An open-source platform for building, maintaining, and validating HTTP APIs against best practices and RFC/IETF standards.Tue, 10 Feb 2026 00:00:00 GMTThe Convergence of Hypermedia and AIhttps://keckl.com/blog/01-the-convergence-of-hypermedia-and-ai/https://keckl.com/blog/01-the-convergence-of-hypermedia-and-ai/How hypermedia-driven REST, once amplified by MDSD, now becomes a practical foundation for AI-native software and agentic clients.Sun, 01 Feb 2026 00:00:00 GMTFastify and Its Ecosystemhttps://keckl.com/projects/fastify-ecosystem/https://keckl.com/projects/fastify-ecosystem/Ongoing open-source contributions to Fastify and adjacent packages, spanning features, bug fixes, and developer documentation.Thu, 15 Jan 2026 00:00:00 GMTBroken Contracts? Towards Automated Conformance Testing for HTTP Semanticshttps://keckl.com/research/keckl-2026-broken-contracts-http-semantics/https://keckl.com/research/keckl-2026-broken-contracts-http-semantics/Keckl, Matthias and Gruber, Lorenz and Müller, Peter and Tennert, Andreas and Ende, Markus and Braun, Peter and Herbst, Nikolas (2026)Thu, 01 Jan 2026 00:00:00 GMTfastify-overridehttps://keckl.com/projects/fastify-override/https://keckl.com/projects/fastify-override/A Fastify testing helper that makes plugins, decorators, and hooks overrideable for focused and deterministic tests.Wed, 10 Dec 2025 00:00:00 GMTScalarhttps://keckl.com/projects/scalar/https://keckl.com/projects/scalar/Frequent contributions to Scalar, with practical improvements and bug fixes that supported Thymian integration work.Thu, 20 Nov 2025 00:00:00 GMTModel-driven Software Development as the Key to RESTful Web Interfaces and Digitizationhttps://keckl.com/research/keckl-2022-model-driven-software-development/https://keckl.com/research/keckl-2022-model-driven-software-development/Keckl, M. and Mueller, P. B. M. and Braun, P. (2022)Sat, 01 Jan 2022 00:00:00 GMTDesign and Implementation of a Node.js Framework for the Development of RESTful APIshttps://keckl.com/research/keckl-2021-node-js-rest-api-framework/https://keckl.com/research/keckl-2021-node-js-rest-api-framework/Keckl, Matthias (2021)Fri, 01 Jan 2021 00:00:00 GMT