import test from 'node:test'; import assert from 'node:assert'; test('synchronous passing test', (t) => assert.strictEqual(1, 1); ); test('asynchronous passing test', async (t) => const number = await Promise.resolve(42); assert.strictEqual(number, 42); ); Use code with caution.
For developers working with native addons, v18.20.0 brought an experimental feature to better manage garbage collection (GC) by segregating finalizers that affect GC state. It also introduced the node_api_nogc_env API to help native module authors write safer and more efficient code by providing a const version of the environment that guarantees no GC interaction in certain contexts, leading to better memory management and predictability for performance-critical applications.
The standout feature of Node.js 18 is the introduction of a native global fetch API. Previously, developers had to rely on external libraries like node-fetch or axios to make HTTP requests.
| 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 | node 18 full
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: Node 18 introduced an experimental native test runner module (
First: fetch() is built-in. No more node-fetch . Try it right now – it just works. The standout feature of Node
Node.js 18, codenamed "," was a milestone release that significantly narrowed the gap between server-side and browser JavaScript . Released on April 19, 2022, it introduced several long-awaited native features like a global fetch API and a built-in test runner.
With the V8 10.1 upgrade, is officially supported. Developers can now use await outside of an async function within ES Modules (ESM). javascript
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This is a small but impactful quality-of-life improvement for everyday coding tasks.
import test, mock from 'node:test'; import assert from 'node:assert';
This comprehensive guide explores the core features, architectural shifts, and practical upgrade strategies that define Node.js 18. 1. Native Web Broadcast APIs
Node.js 18 uses OpenSSL 3.0, which enforces stricter cryptographic standards. Legacy applications using older TLS versions or insecure cipher suites may fail to connect unless explicitly configured.
import test, describe from 'node:test'; import assert from 'node:assert';