No more jest or mocha for basic use cases—Node 18 gives you a full test harness out of the box. Streaming data is critical for performance. Node 18 delivers the full Web Streams API ( ReadableStream , WritableStream , TransformStream ), making it compatible with the standardized web platform.
node --version # v18.x.x npm --version # 9.x.x or higher For developers who need multiple Node versions:
Node 18 delivers a comprehensive, production-ready platform that reduces external dependencies, improves performance, and aligns with modern web standards. The full package includes everything from a test runner to a Fetch API, making it a self-sufficient JavaScript runtime.
| Metric | Node 14 | Node 16 | Node 18 Full | | ------ | ------- | ------- | -------------- | | Requests/sec | 12,400 | 14,200 | | | Avg Latency (ms) | 78 | 69 | 58 | | Memory (MB) | 210 | 198 | 172 | | Startup Time (ms) | 145 | 138 | 124 |
Run it with: node --test
const ReadableStream = require('node:stream/web'); const stream = new ReadableStream( start(controller) controller.enqueue('Hello '); controller.enqueue('World'); controller.close(); ); This is a game-changer for building high-performance data pipelines without third-party stream libraries. Node 18 adds server response timeout and better diagnostics channels. The full server.headersTimeout and server.requestTimeout properties allow fine-grained control over hanging connections.