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Lessons (7)

• DRY: Don't Repeat Yourself

  … frontend and backend A shared schema (for example, Zod) used by both API types written by hand in …

• TypeScript Essentials

  … of truth (remember DRY ). ts import { z } from "zod"; const UserSchema = z.object({ id: z.number(), name: z …

• Advanced TypeScript for Frontend

  … Validate it before it enters application state. Validate unknown data at the boundary ts import { z } from "zod …

• TypeScript in Practice

  … A schema library (Zod, Valibot, ArkType) checks the data and produces the type: ts import { z } from "zod …

• Node.js and Express

  … last . Validation and errors js import { z } from "zod"; class HttpError extends Error { constructor(status, message) { super(message …

• Authentication, Authorization & API Security

  … SameSite - [ ] Validate all input (schema validation such as Zod or Joi) - [ ] Parameterised queries / ORM - [ ] Authorization check on every …

• Frontend Testing Strategy

  … API disagreeing on shapes Pact, shared schemas (OpenAPI / Zod) A practical CI pipeline mermaid flowchart LR PR[Pull …