Elk

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Elk is an Open Source & Models tool that provides a low-footprint JavaScript engine for embedded systems. It allows developers to add JavaScript customizations to firmware developed in C/C++.

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At a glance

Pricing

Open Source

Free tier

Yes

API

Yes

Skill level

Technical

About

What is elk?

Elk is a tiny, embeddable JavaScript engine specifically designed for microcontroller development and embedded systems. It implements a small but usable subset of ES6, enabling developers to integrate JavaScript customizations into firmware primarily written in C/C++. This approach allows for flexible device functionality extensions without rewriting core C/C++ code. Key features include cross-platform compatibility, zero dependencies, easy embedding by simply copying two files, and a small footprint of about 20KB on flash/disk and minimal RAM usage. Elk operates without `malloc`, using only a given memory buffer, and directly interprets JS code without bytecode, making it highly tunable and minimal.

Best used for

Ideal for developers who need to add JavaScript logic to embedded systems, customize microcontroller firmware, and integrate C/C++ code with JS. Especially valuable for projects requiring a minimal footprint and direct interpretation of JavaScript without extensive overhead or standard libraries.

Common actions

embed javascript

customize firmware

develop microcontrollers

integrate C++ with JS

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Capabilities

Key features

Low footprint JavaScript engine
Embedded systems development
C/C++ firmware integration
Zero dependencies
Small embedding API
Direct JS code interpretation

Target Audience

developer

Integrations

Not yet documented

Pricing & Plans

Open Source

Free

FAQs

What JavaScript features does Elk support?

Elk supports standard JS operations (excluding `!=`, `==`, `**`, computed member access), `typeof`, `for` loops, `if/else` conditionals, ternary operators, simple types (`let`), functions, and objects. It does not support `var`, `const`, `do`, `switch`, `while`, arrow functions, arrays, closures, prototypes, `this`, `new`, `delete`, or a standard library.

How does Elk handle memory management?

Elk does not use `malloc`; it operates exclusively within a single memory buffer provided during initialization. This design ensures a predictable and low memory footprint, making it suitable for resource-constrained embedded systems.

Can I call C functions from JavaScript and vice-versa with Elk?

Yes, Elk provides a clear API for both calling C functions from JavaScript and embedding JavaScript code within C/C++ firmware. This allows for seamless interaction and orchestration between the two languages.

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