Node.js 14.x: What's New, Release History & Support Lifecycle

What Is New in Node.js 14?

Optional Chaining and Nullish Coalescing -- Finally Native

Two of the most requested JavaScript features land natively in Node.js 14 via V8 8.0. Optional chaining (?.) short-circuits property access on null/undefined. Nullish coalescing (??) provides a default only when the left side is null or undefined (unlike || which also triggers on 0 or "").

const city = user?.address?.city ?? 'Unknown';
const port = config.port ?? 3000;  // 0 is a valid port, ?? handles that correctly

Previously these required Babel transforms. In Node.js 14 they run natively, reducing transpilation overhead for server-side code.

AsyncLocalStorage -- Request-Scoped Context Without Parameter Passing

AsyncLocalStorage lets you store and retrieve values scoped to an async call tree -- useful for request IDs, user context, logging correlation, and tracing without threading values through every function call.

import { AsyncLocalStorage } from 'node:async_hooks';
const storage = new AsyncLocalStorage();

app.use((req, res, next) => {
  storage.run({ requestId: req.id }, next);
});

function log(msg) {
  const ctx = storage.getStore();
  console.log(`[${ctx?.requestId}] ${msg}`);
}

OpenTelemetry, Datadog APM, and many tracing libraries use this API internally. In v14 it's experimental but widely adopted.

fs.promises Now Stable

The fs.promises API (or import { promises as fs } from 'node:fs') graduates from experimental to stable. All async file operations are available as native promises without callbacks.

import { readFile, writeFile } from 'node:fs/promises';
const content = await readFile('./config.json', 'utf8');
const data = JSON.parse(content);

Diagnostic Reports

The diagnostic report API is now stable. You can generate a JSON snapshot of the process state (heap, handles, libuv, environment variables) on demand or on crash -- invaluable for debugging production issues in environments where you cannot attach a debugger.

process.report.writeReport('./crash-report.json');
// or trigger on signal:
node --report-on-signal --report-signal=SIGUSR2 server.js