Graaljs

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GraalJS is a JavaScript engine implemented in Java on top of GraalVM. It enables the execution of JavaScript and Node.js applications with Java interoperability.

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At a glance

Pricing

open-source

Free tier

—

API

Yes

Skill level

Technical

About

What is graaljs?

GraalJS is a robust JavaScript engine built in Java, leveraging the power of GraalVM. It provides full ECMAScript compliance, allowing developers to run both standard JavaScript and Node.js applications efficiently. A key feature of GraalJS is its seamless interoperability with Java, which facilitates the integration of JavaScript code within Java-based projects. As an open-source project, it offers flexibility and transparency for developers looking to embed or execute JavaScript within a Java ecosystem.

Best used for

Embedding and executing JavaScript and Node.js applications within a Java environment with strong interoperability.

Common actions

run JavaScript in Java

embed JavaScript engine

integrate Node.js with Java

develop polyglot applications

execute ECMAScript

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Capabilities

Key features

JavaScript engine
Java implementation
ECMAScript compliant
Node.js support
Java interoperability

Target Audience

Java developersJavaScript developersSoftware engineersSystem architects

Integrations

Not yet documented

Pricing & Plans

open-source

Free

FAQs

Are there any licensing costs associated with using GraalJS, given it's part of GraalVM?

No, GraalJS itself is open-source and available under a permissive license. While GraalVM has different distributions (Community and Enterprise), GraalJS is included in the open-source GraalVM Community Edition, making it free to use.

What are the performance implications of running JavaScript on GraalJS compared to native Node.js?

GraalJS often achieves comparable or even superior performance to native Node.js for certain workloads due to GraalVM's advanced JIT compilation and optimization techniques. However, performance can vary depending on the specific application and its interaction with Java components.

Can I use existing Node.js modules and npm packages directly with GraalJS?

Yes, GraalJS provides strong Node.js compatibility, allowing you to run many existing Node.js applications and use npm packages. However, modules with native C++ add-ons might require specific build configurations or may not be fully supported.

How does GraalJS handle memory management and garbage collection when integrating with Java applications?

GraalJS leverages the Java Virtual Machine's (JVM) robust memory management and garbage collection. JavaScript objects and Java objects can interact seamlessly, and the JVM handles the lifecycle of both, ensuring efficient resource utilization.

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