Reliability Sprint: enforce strict input validation #27

Code Example

import { PrismaClient } from "@prisma/client";

const prisma = new PrismaClient();

export async function getAccountOverview(userId: string) {
  const user = await prisma.user.findUnique({
    where: { id: userId },
    include: {
      subscriptions: true,
      completedLessons: { take: 5, orderBy: { completedAt: "desc" } },
    },
  });
  if (!user) {
    throw new Error("User not found");
  }
  return {
    email: user.email,
    completedLessons: user.completedLessons.length,
    hasSubscription: user.subscriptions.some((item) => item.status === "ACTIVE"),
  };
}

console.log("Sync schema with:", "app.get('/route', handler)");

Commands & References

• npm run dev
• node server.js
• app.get('/route', handler)

Lab Steps

1. Prepare environment using: npm run dev
2. Implement endpoint or middleware for this scenario.
3. Test positive/negative cases and inspect response contracts.
4. Document one reliability or security improvement.

Exercises

• Add one edge-case validation and return clear error details.
• Improve one endpoint to be idempotent and test retries.
• Write one test case proving the expected API behavior.