nats-io/nats-server

Analysis updated 2026-06-21

★ 19,781GoAudience · ops devopsComplexity · 4/5LicenseSetup · moderate

Mindmap

mindmap
  root((repo))
    What It Does
      Messaging server
      Pub-sub routing
      Persistent streaming
    Tech Stack
      Go
      40 plus client libs
    Use Cases
      Microservices events
      IoT data routing
      Edge device commands
    Features
      JetStream persistence
      Request-reply pattern
      TLS security
    Audience
      DevOps engineers
      Backend developers

mindmap root((repo)) What It Does Messaging server Pub-sub routing Persistent streaming Tech Stack Go 40 plus client libs Use Cases Microservices events IoT data routing Edge device commands Features JetStream persistence Request-reply pattern TLS security Audience DevOps engineers Backend developers

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What do people build with it?

USE CASE 1

Connect microservices so they exchange events without hard-coded dependencies on each other.

USE CASE 2

Build an IoT platform where sensors publish data and backend services subscribe to process it in real time.

USE CASE 3

Add persistent message queuing with JetStream for guaranteed delivery and message replay on service restart.

USE CASE 4

Route commands from a cloud backend to edge devices or constrained hardware like a Raspberry Pi.

What is it built with?

How does it compare?

	nats-io/nats-server	ahmetb/kubectx	twpayne/chezmoi
Stars	19,781	19,732	19,701
Language	Go	Go	Go
Setup difficulty	moderate	easy	easy
Complexity	4/5	1/5	2/5
Audience	ops devops	ops devops	developer

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · moderate Time to first run · 30min

Server is a single binary with no external dependencies, but production clustering requires careful TLS and network configuration.

Apache 2.0, use freely for any purpose including commercially, as long as you include the original license notice.

In plain English

NATS is a high-performance messaging server, a piece of software that acts as a central hub for passing messages between different parts of a distributed system. When you have many services, devices, or applications that need to communicate with each other, NATS provides a fast, lightweight, and secure channel for that communication without each piece needing to know where the others are or how to reach them directly. The core concept is publish-subscribe messaging: one service publishes a message on a named subject, and any services that have subscribed to that subject receive it automatically. This decouples the sender from the receiver, making distributed systems easier to build, scale, and maintain. NATS also supports request-reply patterns and persistent message streaming (via JetStream, its built-in persistence layer) for cases where you need guaranteed delivery or replay of messages. NATS is designed to run anywhere, in a cloud data center, at the network edge on constrained hardware, or even on a Raspberry Pi. The server is written in Go and has client libraries in over 40 programming languages. It is part of the Cloud Native Computing Foundation, the organization that stewards Kubernetes and similar infrastructure projects. A security audit by the firm Trail of Bits was completed in April 2025. Engineers building microservices, IoT platforms, connected vehicle systems, or any architecture where many components need to exchange data quickly and reliably would use NATS as the messaging backbone. It is open source under the Apache 2.0 license.

Copy-paste prompts

Prompt 1

Set up a NATS server with Docker and write a Go client that publishes a message and a separate subscriber that receives it, with example subject names.

Prompt 2

I'm building microservices. Show me how to use NATS JetStream for reliable event delivery between services, including replay when a service restarts.

Prompt 3

My IoT platform has 1000 sensor devices. Design a NATS subject hierarchy and subscriber pattern to route and process the messages at scale.

Prompt 4

How do I secure a NATS server with TLS and per-user permissions so different services can only subscribe to the subjects they are authorized for?

Prompt 5

Set up a 3-node NATS cluster so that if one server goes down, my services stay connected and in-flight messages are not lost.

Frequently asked questions

What is nats-server?

A fast, lightweight messaging server that lets services, apps, and devices exchange messages through a central hub, without each part needing to know the others' addresses or being tightly coupled.

What language is nats-server written in?

Mainly Go. The stack also includes Go.

What license does nats-server use?

Apache 2.0, use freely for any purpose including commercially, as long as you include the original license notice.

How hard is nats-server to set up?

Setup difficulty is rated moderate, with roughly 30min to a first successful run.

Who is nats-server for?

Mainly ops devops.

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