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Production-Ready Pre-Launch Checklist

When you test alone on your laptop, everything runs fast and without errors. The moment you put a project in front of real users, bots, and flaky networks in production, the rules change completely.

This interactive checklist accompanies the 'Production-Ready Pre-Launch Checklist' video. Inspect each layer before going live, read the implementation notes, and check off completed items — your progress is saved automatically in your browser.

  • CoreKnow this well before you apply
  • Nice to haveShows up a lot in job posts, gives you an edge
  • LaterOnce you're on the job, when you need it

Click a topic to see what you need to know and where to learn it.

  1. 01

    1. API Security & Traffic Control

    Stop malicious bots or a buggy client loop at the door before they lock up your server in seconds.

  2. 02

    2. Configuration & Environment Variables (.env)

    Validate every setting at startup so a missing API key never blows up mid-checkout at 3 AM.

  3. 03

    3. Centralized Error Handling & Logging

    Never leak internal details to users, but log clearly enough to find the root cause in 30 seconds.

  4. 04

    4. Database, Pooling & Backup Safety

    When traffic spikes, the database is always the first bottleneck. Secure connections, queries, and backups before launch.

  5. 05

    5. Deployment, Healthcheck & Rollback Plan

    Deploy without manual SSH tinkering and make sure you can roll back to the previous working version within 60 seconds.

Topic by topic

Every topic on the map with its description, what to know and resources — in one list.

  1. 011. API Security & Traffic Control

    • Rate Limiting & Throttling· Core

      No API endpoint should be left unbounded. Enforce rate limits so a single user or bot cannot exhaust your CPU and database with thousands of requests per second.

      What you should know

      • Set a sensible per-IP or per-user limit on general endpoints (429 Too Many Requests)
      • Keep counters in Redis rather than in-process memory when running multiple server instances
      • Return remaining quota headers (Retry-After, RateLimit-Remaining)

      Resources

      • Strict limits on Login, Signup & OTP endpoints· Core

        Apply much stricter limits to auth endpoints to block brute-force password guessing and prevent attackers from inflating your SMS/email bill.

        What you should know

        • Allow at most 5 attempts per minute on login and password-reset endpoints
        • Rate-limit by target email/username in addition to client IP
      • Request body size limit· Core

        Cap maximum request body size so an attacker cannot trigger an Out-Of-Memory crash by sending a 500 MB payload to a JSON endpoint.

        What you should know

        • Limit standard JSON endpoints to 100 KB – 1 MB
        • Handle file uploads via S3/R2 pre-signed URLs instead of buffering through the app server
    • Schema Validation, CORS & Security Headers· Core

      Never trust client input. Validate every parameter against a strict schema and lock down browser security headers.

      What you should know

      • Validate Body, Query, and Params with Zod or class-validator and strip or reject unknown fields
      • Whitelist only your own domain in CORS instead of leaving '*' open in production
      • Enable HSTS, X-Content-Type-Options, and Content-Security-Policy headers

      Resources

      • Idempotency-Key on critical mutations· Nice to have

        Guarantee that double-clicking 'Pay' or 'Create Order' on a slow network executes the operation only once.

        What you should know

        • Lock the client-supplied Idempotency-Key in Redis with a TTL
        • Return the cached first response for duplicate requests without re-running the side effect

  2. 022. Configuration & Environment Variables (.env)

    • Startup Environment Validation (Fail-Fast Boot)· Core

      Validate all required environment variables against a schema when the process boots. If even one is missing, refuse to start and print the exact missing variable.

      What you should know

      • Read from a single validated config module instead of scattering raw process.env calls across the codebase
      • Keep an up-to-date, documented .env.example file in the repository

      Resources

      • Strict isolation of Dev/Staging and Production secrets· Core

        Ensure local and staging environments never share database credentials, JWT secrets, or live payment keys with production.

        What you should know

        • Generate cryptographically distinct JWT_SECRET and database passwords per environment
        • Verify no .env file or secret key was ever committed into Git history

  3. 033. Centralized Error Handling & Logging

    • Global Error Handler & Stack Trace Masking· Core

      When an unexpected database or runtime error occurs, never return raw stack traces containing table names and file paths. Return a clean, standardized error response.

      What you should know

      • Assign a unique Request-ID (Correlation ID) to every request and include it in error responses
      • Distinguish expected operational errors (400/404) from unexpected system crashes (500)
      • Structured JSON Logging & PII Redaction· Core

        Use searchable structured JSON logs (Pino / Winston) instead of raw console.log, and redact passwords, tokens, and card numbers before writing logs.

        What you should know

        • Automatically redact password, token, authorization, and cvv fields in the logger
        • Connect an error tracking tool (e.g., Sentry) that alerts you immediately on 500 errors

  4. 044. Database, Pooling & Backup Safety

    • Connection Pooling & Timeout Boundaries· Core

      Opening a fresh database connection per request quickly exhausts the server. Use a bounded connection pool and enforce timeouts on slow queries and external HTTP calls.

      What you should know

      • Size your connection pool limit by dividing available DB connections across app instances
      • Set strict 3–10s timeouts on all outbound calls (payment, email, third-party APIs)
      • Implement Graceful Shutdown on SIGTERM to finish in-flight requests and close DB connections cleanly
      • Index Coverage & N+1 Query Check· Core

        Verify indexes exist on columns used in WHERE, JOIN, and ORDER BY clauses, and confirm list endpoints don't fire N+1 queries inside loops.

        What you should know

        • Enable ORM query logging locally and walk through every core user flow
        • Never leave a list endpoint without pagination or a hard maximum limit
      • Automated Backups & Restore Drill· Core

        A backup you haven't restored is not a backup. Enable automated daily backups and test restoring a snapshot into a fresh instance before launch.

        What you should know

        • Run schema changes exclusively through versioned migration files, never manual SQL in prod

  5. 055. Deployment, Healthcheck & Rollback Plan

    • Deep Healthcheck Endpoint & Hardened Container· Core

      Expose a `/health` endpoint that actually pings your database and Redis so the load balancer never routes traffic to a broken container.

      What you should know

      • Keep the old container serving until the new one passes /health checks (Zero-Downtime)
      • Build multi-stage Docker images and run the process as a non-root user
      • Automated CI/CD Pipeline & One-Command Rollback· Core

        Never SSH into production to run git pull by hand. Automate test + build via GitHub Actions and tag images by commit SHA for instant rollback.

        What you should know

        • Tag every Docker image with the Git commit SHA, never just 'latest'
        • Watch error rates and p95 latency for the first 5 minutes after every release