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Why is my useEffect running twice in Next.js development?

1Mounted
2Mounted

1Mounted
2Mounted

1npm run dev

1npm run dev

1import { useEffect } from "react";
2
3export default function Home() {
4  useEffect(() => {
5    console.log("Mounted");
6  }, []);
7
8  return <h1>Hello</h1>;
9}

1import { useEffect } from "react";
2
3export default function Home() {
4  useEffect(() => {
5    console.log("Mounted");
6  }, []);
7
8  return <h1>Hello</h1>;
9}

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Why is my useEffect running twice in Next.js development?

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