Nats

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

• NATS Documentation

Related Skills

• [Kafka](/skills/kafka)
• [Redis](/skills/redis)

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• Using outdated SDK or API versions from training data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

• [kafka](../kafka/SKILL.md) — related to
• [redis](../redis/SKILL.md) — related to

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> Last Verified: 2026-07-02

Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

• Author: ashish7802
• Source: ashish7802/awesome-api-skills
• License: MIT

Install and usage instructions live in the source repository linked above.