modbus-serial
Pure JavaScript implementation of MODBUS-RTU for serial and TCP communication.
Pricing
Free tier
Flat rate
Adoption
→StableLicense
Open Source
Data freshness
Aging · Jun 8, 2026Overview
What is modbus-serial?
Modbus-Serial is a pure JavaScript library that implements the MODBUS-RTU protocol, enabling developers to communicate with industrial devices over serial or TCP connections. It's essential for integrating modern web applications with legacy hardware systems.
Key differentiator
“Modbus-Serial stands out as a lightweight, pure JavaScript solution for implementing MODBUS-RTU in Node.js applications, offering both serial and TCP support without requiring external dependencies.”
Capability profile
Capability Radar
Honest assessment
Strengths & Weaknesses
↑ Strengths
↓ Weaknesses
The official documentation lacks comprehensive guides and practical examples for common use cases.
Errors thrown by the library often do not provide enough context to diagnose issues, making troubleshooting difficult.
The library may struggle under heavy load or frequent polling scenarios due to its synchronous nature and lack of optimization for real-time communication.
The GitHub repository has few contributors and infrequent updates, indicating a small user base and potentially slower issue resolution.
Fit analysis
Who is it for?
✓ Best for
Teams developing Node.js applications that need to communicate with industrial devices over MODBUS-RTU.
Projects requiring both serial and TCP support in a single library.
✕ Not a fit for
Applications needing real-time data streaming beyond the capabilities of MODBUS
Scenarios where only cloud-based solutions are acceptable
Cost structure
Pricing
Free Tier
Available
Open source — free to use
Starts at
$0
Model
Flat rate
Enterprise
None
Performance benchmarks
How Fast Is It?
Ecosystem
Relationships
Integrations
Next step
Get Started with modbus-serial
Step-by-step setup guide with code examples and common gotchas.