Ask262

Need to understand what the ECMAScript spec actually says about that JavaScript behavior? This server gives you vector search over the official spec sections, lets you retrieve full section content, and runs JavaScript in engine262 while capturing which spec sections get hit during execution. You can mark critical parts of your code with ask262Debug.startImportant() to focus on the relevant spec bits. It's backed by a knowledge graph linking spec sections to implementation functions. Runs hosted at ask262.bendtherules.io or locally via stdio with Bun. Useful when you're debugging weird edge cases, writing a JS engine, or just want to know why JavaScript does that thing it does without guessing from Stack Overflow.