All lessons
validation
2 free lessons tagged validation across AI, Programming. Each one is a short sequence of focused steps with narration and a five-question quiz at the end — take them in any order, no signup required.
AI
advancedTool Use Patterns: Schema Design, Structured Output, and Validation Loops
A deep dive into designing tool schemas that LLMs actually call correctly — covering parameter naming, description quality, structured output via response schemas, output parsing, and error message design that drives self-correction.
14 steps·~21 min
Programming
intermediateBuilding REST APIs with Express
Build a small REST API on Node 22 with Express: routes, middleware, JSON body parsing, Zod input validation, status codes, and a clean async error pipeline you won't outgrow.
10 steps·~15 min