Frontend Frameworks

modbus-serial

Pure JavaScript implementation of MODBUS-RTU for serial and TCP communication.

Status
Generally available
Last checked
Checked · Oct 16, 2026
License
Open source
Pricing
Free tier · from $0
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What it is

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.

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.

When it fits — and when it doesn’t

A good fit 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.

Look elsewhere if

  • Applications needing real-time data streaming beyond the capabilities of MODBUS

  • Scenarios where only cloud-based solutions are acceptable

Known weaknesses

Each one links to the public issue, changelog or docs page it came from, where we have one.

  1. 01

    Poor error handling and debugging support

    Errors thrown by the library often do not provide enough context to diagnose issues, making troubleshooting difficult.

  2. 02

    Performance limitations with high-frequency data exchanges

    The library may struggle under heavy load or frequent polling scenarios due to its synchronous nature and lack of optimization for real-time communication.

  3. 03

    Small community and limited support

    The GitHub repository has few contributors and infrequent updates, indicating a small user base and potentially slower issue resolution.

What it does well

  • Pure JavaScript implementation of MODBUS-RTU protocol

  • Supports both serial and TCP communication

  • Easy to integrate with Node.js applications

Pricing

Free tier
YesOpen source — free to use
Paid from
$0
Model
Flat rate
Enterprise plan
No

Pricing not independently confirmed — check the vendor’s page.

Performance benchmarks

How Fast Is It?

Set up modbus-serial

Setup steps, common gotchas and what to check after 30 days.

Open the setup guide →