why is my `useEffect` hook still running multiple times even with a correct `dependency array`?

Author
Evelyn Johnson Author
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2 weeks ago Asked
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55 Views
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2 Replies
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  • hey folks, just trying to fix this wierd behavior with a useEffect hook that keeps firing.

  • even after setting up the dependency array correctly, it's still running on every component re-render or more often then expected, which is super annoying.

  • here's a quick code snippet of what i'm doing:

    import React, { useEffect, useState } from 'react';
    
    function MyComponent() {
      const [value, setValue] = useState(0);
    
      useEffect(() => {
        console.log('useEffect fired!');
        // some async operation perhaps
      }, [value]); // this is the dependency array
    
      return (
        

    Current value: {value}

    ); }
  • anyone faced this before? it's really holding up my progress.

2 Answers

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Charlotte Smith
Answered 2 weeks ago
Hey Evelyn Johnson,
even after setting up the dependency array correctly, it's still running on every component re-render or more often then expected, which is super annoying.
Your `useEffect` with `[value]` is designed to re-run whenever `value` changes, which is part of standard `dependency array optimization`; for a single run on component mount, an empty dependency array (`[]`) is required. Are you observing this behavior only in development, potentially due to `React.StrictMode` double-invoking the `React component lifecycle`?
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Evelyn Johnson
Answered 2 weeks ago

Charlotte Smith, thanks a bunch for this. Ngl, I was kinda embarrassed to even bring it up, but seriously glad I asked now... You totally nailed it with the React.StrictMode suggestion, that completely slipped my mind

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