ashish7802 NATS API Skill
Quick Start
NATS is an extremely high-performance messaging system (Pub/Sub, Request/Reply, JetStream). Use the nats package for Node.js to communicate.
npm install nats
Common Workflows
JetStream Persistence
Standard NATS is ephemeral (fire-and-forget). For guaranteed delivery and message replay, use JetStream. Create a Stream, publish messages to it, and consume them using durable consumers.
Production Patterns
Request-Reply Architecture
Replace internal REST microservices with NATS Request-Reply. Service A sends a request to a subject orders.create; Service B processes it and replies on a unique inbox subject. This decouples services and enables load balancing automatically.
Error Recovery
NATS handles reconnections automatically. However, if a message publication to JetStream fails (e.g., NoResponders), catch the error and queue it locally or utilize an exponential backoff retry mechanism.
Security Notes
Use NATS Decentralized Auth (NKEYS). Never pass plaintext passwords. Issue scoped credentials to services, restricting which subjects they can publish or subscribe to.
Performance Considerations
NATS can process millions of messages per second. Avoid processing messages sequentially in tight loops; utilize asynchronous handlers to prevent blocking the Node.js event loop.
Testing Guidance
Spin up a local NATS server binary (nats-server) or Docker container in your CI/CD pipeline. It boots in milliseconds and consumes negligible RAM.
Troubleshooting
If consumers aren't receiving messages in a JetStream, verify that the subject they are listening to exactly matches the subjects bound to the underlying Stream configuration.
References
Related Skills
Why use this skill
Use this when your agent works with nats — structured patterns beat pasted docs and prevent common hallucinations.
AI pitfalls
- Using outdated SDK or API versions from training data
- Inventing environment variable names
- Omitting error handling and retry logic
Production checklist
- Secrets in environment variables, not source code
- Error handling and logging in place
- Rate limits and timeouts configured
Related skills
Last Verified: 2026-07-02