The Internet of Things (IoT) is transforming how we live and work—connecting everything from smart watches and refrigerators to industrial sensors and medical devices. But as these devices get smarter, they also need software that’s just as efficient and responsive.
That’s where JerryScript comes in.
What is JerryScript?
JerryScript is a super lightweight, fast, and memory-efficient JavaScript engine created specifically for resource-constrained devices, like microcontrollers used in IoT. It allows developers to write and run JavaScript code on devices with as little as 64KB of RAM and 200KB of ROM. That’s incredibly small—especially when you consider how much memory regular JavaScript engines like V8 or SpiderMonkey need.
Why Use JavaScript in IoT?
Traditionally, embedded systems have been programmed in C or C++, which are powerful but complex languages. JavaScript, on the other hand, is easy to learn, widely used, and already familiar to millions of developers. Bringing JavaScript to IoT means:

• Faster development time
• More accessible programming
• Smoother integration with web platforms

JerryScript bridges the gap between JavaScript’s simplicity and the strict limitations of IoT hardware.
Key Features of JerryScript
Lightweight: Designed for microcontrollers and low-memory devices.
Fast: Optimized for performance even with minimal resources.
Safe: Includes a sandboxed execution model, reducing the risk of system crashes.
Compact: Easily embeddable into any IoT firmware.
Compatible: Supports ECMAScript 5.1 (with partial ES6), enough for most real-world use cases.


Who Uses JerryScript?
JerryScript is used in real-world IoT projects, including Samsung’s TizenRT, and can be found in wearables, sensors, and home automation systems. It’s backed by the Samsung Open Source Group and has an active GitHub repository for community contributions.
Why JerryScript Matters
As the IoT ecosystem grows, the need for simple, scalable software solutions becomes even more critical. JerryScript empowers developers to use JavaScript in places it never could go before—without compromising speed, size, or safety.
Whether you’re building a smart thermostat or a connected industrial sensor, JerryScript gives you the tools to develop efficiently and maintain your code easily over time.