Published onJuly 7, 2025diagramat: Building a Modular Diagram Editor with AIdiagram-editordraw.iotypescriptvanilla-jssvgopenai-codexllmagent-workflowsvitetailwindcsscanvasnode-edge-graphhome-devHow I used OpenAI Codex to build a modular, extensible draw.io-style diagram editor from scratch. In 3 evenings. Then 600 commits later, it actually felt good.
