Bun Projects

Build seven production grade JavaScript applications with Bun, from API gateway to multi tenant SaaS, and ship them with confidence.

Bun Projects shows how to design and deliver real services that must be fast, reliable, and secure. If you need working guidance for REST APIs, WebSockets, databases, and deployment, this book gives you a clear path with code that runs.

You will apply proven patterns step by step, learn the tradeoffs that matter, and finish each project with tests, observability, and a deployment story you can reuse at work.

• Design a high performance API gateway with rate limiting, request and response caching, circuit breakers, structured logging, and tracing
• Stand up a Bun TypeScript stack with strict configs, dependency control, and clean project structure for teams
• Implement dynamic service discovery with Consul, health checks, and latency aware load balancing
• Add JWT authentication with token validation rules, scope handling, and downstream identity headers
• Build a Redis backed token bucket limiter that works across processes with a safe Lua script
• Write operational tests for the gateway, including unit, integration, and load tests with clear pass and fail signals
• Containerize and deploy to Kubernetes with probes, resources, autoscaling, metrics, and dashboards
• Create a real time collaborative editor with WebSocket Pub Sub, operational transformation, presence, and reconnection flows
• Persist collaborative state in PostgreSQL with history, and coordinate multiple server instances with Redis
• Construct an event streaming pipeline using Redis Streams consumer groups, idempotent processing, dead letter queues, and exactly once patterns
• Store and query events efficiently in PostgreSQL with partitioning and indexing tuned for high throughput
• Build a live analytics dashboard that aggregates events and stays responsive under load
• Orchestrate microservices with service discovery, an API gateway edge, JWT based inter service auth, and distributed tracing with OpenTelemetry and Jaeger
• Add centralized logging, error correlation, Prometheus metrics, and Grafana SLO views that support on call work
• Deploy with Helm charts and autoscaling that respects latency targets
• Serve a real time trading dashboard with fast WebSocket streaming, order book depth, P and L tracking, and backpressure management
• Use TimescaleDB for time series storage and write tests that surface performance regressions
• Ship a multi region GraphQL federation gateway with subgraphs, schema composition, DataLoader for N plus 1 control, and subscriptions
• Optimize GraphQL performance with Redis caching, custom errors, and schema validation tests
• Deliver a multi tenant SaaS API with PostgreSQL Row Level Security, role based access control, API keys, and per tenant rate limiting
• Integrate billing with Stripe subscriptions, invoices, payment methods, and verified webhooks with idempotency
• Validate tenant isolation and auth flows with focused tests, then deploy with monitoring and logs that make production support straightforward

This is a code heavy guide with runnable TypeScript, SQL, Lua, and YAML examples. Copy the snippets, set environment variables, and build real projects with Bun.

Get practical patterns you can apply today, then grab your copy and start building.