Lesson 22 / 30

try/catch in Async Code

Catch errors from await and Promise chains with try/catch, and know what try/catch cannot catch.

Wrapping await

A rejected Promise inside an async function is thrown at the await — catch it with try/catch.

import { readFile } from "node:fs/promises";

async function loadConfig() {
  try {
    const raw = await readFile("config.json", "utf8");
    return JSON.parse(raw);
  } catch (err) {
    console.error("Could not load config:", err.message);
    return {};
  }
}

try/catch can't wrap callbacks

try/catch only catches synchronous throws (and awaited rejections) — an error thrown inside a plain callback later on the event loop escapes it entirely.