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NATS vs Mosquitto
Competes withCurated
Overview
NATS and Eclipse Mosquitto represent two approaches to lightweight messaging for IoT and distributed systems. Mosquitto is the reference implementation of the MQTT protocol, while NATS provides a purpose-built protocol with MQTT compatibility.
Feature Comparison
| Capability | NATS | Mosquitto |
|---|---|---|
| Primary Protocol | NATS (native) | MQTT 3.1/3.1.1/5.0 |
| MQTT Support | Gateway mode (3.1.1) | Native |
| Persistence | JetStream (optional) | Yes (QoS 1/2) |
| Request-Reply | Native | Via response topics |
| Streaming | Built-in (JetStream) | No |
| Key-Value Store | Built-in | No |
| Clustering | Built-in | Via bridges |
| Single Binary | Yes (~20MB) | Yes (~1MB) |
| License | Apache 2.0 | EPL/EDL dual |
When to Choose NATS
- You need a unified messaging layer for microservices AND IoT
- Request-reply patterns are central to your architecture
- You want built-in streaming persistence without adding Kafka
- Multi-region clustering is required
- You need key-value or object storage alongside messaging
When to Choose Mosquitto
- You need pure MQTT 5.0 support
- Existing MQTT-based IoT devices must connect without protocol translation
- Minimal footprint is critical (Mosquitto is smaller)
- You want the most widely-deployed MQTT broker for compatibility testing
Can They Coexist?
Yes. NATS can act as an MQTT gateway, accepting MQTT connections from devices while using native NATS internally. Mosquitto can bridge to NATS for hybrid deployments.
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