Preparing for Launch
Launching an API is a significant milestone that requires careful preparation across multiple domains: infrastructure, security, documentation, support, and operations. Rushing to launch without verifying each area can result in downtime, security incidents, or a poor developer experience that undermines adoption.
This checklist covers the 15 essential items to verify before your API goes live.
Infrastructure and Performance
1. Load Test Your API
Run load tests that simulate expected peak traffic plus a safety margin of at least 2x. Identify bottlenecks in your application, database, and downstream dependencies. Document the maximum throughput your infrastructure can handle and set up auto-scaling rules if applicable.
2. Configure Health Check Endpoints
Implement a GET /health endpoint that returns the current status of your API and its critical dependencies (database, cache, message queue). Use this endpoint for load balancer health checks and uptime monitoring services.
3. Set Up CDN and Caching
For read-heavy endpoints, configure appropriate Cache-Control headers and consider placing a CDN in front of your API. Implement cache invalidation strategies for data that changes frequently. Ensure authenticated endpoints are not cached publicly.
4. Configure Database Connection Pooling
Verify that your database connection pool is sized appropriately for your expected concurrency. Monitor connection usage under load and adjust pool sizes to prevent connection exhaustion during traffic spikes.
5. Deploy to Multiple Availability Zones
Ensure your API is deployed across at least two availability zones to maintain uptime during infrastructure failures. Verify that failover works correctly by simulating a zone outage.
Security
6. Complete the Security Checklist
Work through every item on the API Security Checklist before launch. This includes enforcing HTTPS, implementing authentication and authorization, validating input, applying rate limits, and configuring security headers.
7. Set Up DDoS Protection
Enable DDoS mitigation at your edge layer through your cloud provider or a service like Cloudflare. Configure traffic thresholds that trigger automatic mitigation without blocking legitimate users.
8. Review Secrets Management
Confirm that all API keys, database credentials, and third-party tokens are stored in a secrets manager, not in environment files or code repositories. Verify that secrets are rotated on a regular schedule and that rotation does not cause downtime.
Documentation and Developer Experience
9. Publish Complete API Documentation
Your documentation must include an overview, authentication guide, endpoint reference with request and response examples, error code reference, rate limiting policy, and pagination details. Test every code example to ensure it works.
10. Create a Getting Started Guide
Write a quickstart guide that enables a new developer to make their first successful API call within five minutes. Include copy-pasteable code examples in at least two popular programming languages.
11. Set Up a Developer Portal
Provide a self-service portal where developers can register, create API keys, view usage analytics, and manage their account. Ensure the registration flow is simple and does not require manual approval for basic access.
Operations and Monitoring
12. Configure Monitoring and Alerting
Set up monitoring for key metrics including response latency (p50, p95, p99), error rates (4xx and 5xx), request throughput, and infrastructure utilization. Configure alerts that notify your on-call team when metrics breach defined thresholds.
13. Establish an Incident Response Plan
Document your incident response process including escalation paths, communication templates, and post-incident review procedures. Ensure at least two team members are trained and available to respond to production incidents at all times.
14. Set Up a Status Page
Provide a public status page where users can check the current operational status of your API and view historical uptime data. Configure the status page to update automatically based on your monitoring system or enable manual updates during incidents.
15. Define an SLA and Communicate It
Establish a Service Level Agreement that defines your uptime commitment, response time guarantees, and support availability. Communicate the SLA clearly in your documentation and terms of service. Ensure your infrastructure and operational processes can support the commitments you make.
Post-Launch
After launching, schedule the following recurring activities:
- Weekly: Review error rates, latency trends, and customer feedback
- Monthly: Audit API usage patterns and identify endpoints that need optimization
- Quarterly: Conduct security reviews and re-run this checklist for any new endpoints or features
- Annually: Engage a third-party firm for penetration testing and a comprehensive security audit
A successful API launch is not a one-time event but the beginning of an ongoing commitment to reliability, security, and developer satisfaction.