⚛️ React Errors

32 error notes

Warning: React has detected a change in the order of Hooks called by ComponentName. This will lead to bugs and errors if not fixed. For more information, read the Rules of Hooks: https://reactjs.org/link/rules-of-hooks

reacthooksrules-of-hooksdebugging

reactintermediate

Fix 'Prop className did not match' Warning with styled-components in React SSR

Warning: Prop `className` did not match. Server: "sc-bdVTJa" Client: "sc-fzoLsD"

reactstyled-componentsssrhydration

reactbeginner

Fixing 'Element type is invalid: expected a string but got: undefined' in React

React.createElement: type is invalid -- expected a string (for built-in components) or a class/function (for composite components) but got: undefined. You likely forgot to export your component from the file it's defined in, or you might have mixed up default and named imports.

reactjavascriptdebuggingfrontend

reactintermediate

Fix ChunkLoadError: Loading chunk failed in React Production Build

ChunkLoadError: Loading chunk 3 failed. (error: https://example.com/static/js/3.chunk.js)

webpackcode-splittingreact-lazyproduction

reactintermediate

Fix 'Cannot update a component while rendering a different component' in React

Warning: Cannot update a component (`App`) while rendering a different component (`Child`). To locate the bad setState() call inside `Child`, follow the stack trace as described in https://reactjs.org/link/setstate-in-render

reactsetStaterenderside-effect

reactintermediate

Fix 'React Hook useEffect has a missing dependency' Warning That Causes Silent Bugs

React Hook useEffect has a missing dependency: 'someVariable'. Either include it or remove the dependency array.  react-hooks/exhaustive-deps

reactuseEffecteslinthooks

reactbeginner

Fix 'Received true for a non-boolean attribute' Warning When Passing Boolean Props to DOM Elements in React

Warning: Received `true` for a non-boolean attribute `loading`. If you intentionally want it to appear in the DOM as a custom attribute, spell it as lowercase `loading` instead. If you accidentally passed it from a parent component, remove it from the DOM element.

dompropsboolean-attributehtml

reactbeginner

Fix 'Rendered more hooks than during the previous render' in React

Error: Rendered more hooks than during the previous render.

reacthooksrules-of-hooksconditional-rendering

reactintermediate

Fix 'Function components cannot be given refs' with React.forwardRef

Warning: Function components cannot be given refs. Attempts to access this ref will fail. Did you mean to use React.forwardRef()?

reactforwardRefrefhooks

reactbeginner

Fix 'Objects are not valid as a React child (found: object with keys {then})' — Rendering a Promise in JSX

Objects are not valid as a React child (found: object with keys {then}). If you meant to render a collection of children, use an array instead.

reactpromiseasyncjsx

reactbeginner

Fix 'A component is changing an uncontrolled input to be controlled' in React

Warning: A component is changing an uncontrolled input of type 'text' to be controlled. Input elements should not switch from uncontrolled to controlled (or vice versa).

reactformscontrolled-componentsstate

reactintermediate

Fixing 'useSearchParams() should be wrapped in a suspense boundary' in Next.js

Error: useSearchParams() should be wrapped in a suspense boundary at page "/search". Read more: https://nextjs.org/docs/messages/missing-suspense-with-csr-bailout

reactnextjssuspenseusesearchparams

reactbeginner

Fix: ReactDOM.render is Deprecated in React 18

Warning: ReactDOM.render is no longer supported in React 18. Use createRoot instead. Until you switch to the new API, your app will behave as if it's running React 17.

reactreact18web-devjavascript

reactbeginner

Fixing React validateDOMNesting: Stop Putting <div> Inside <p>

Warning: validateDOMNesting(...): <div> cannot appear as a descendant of <p>. See ... > p > div.

reactdomhtmlnesting

reactintermediate

Fixing the 'React does not recognize prop on a DOM element' Warning

Warning: React does not recognize the `isActive` prop on a DOM element. If you intentionally want it to appear in the DOM as a custom attribute, spell it as lowercase `isactive` instead.

reactweb-developmentstyled-componentsfrontend

reactintermediate

How to Fix 'Blocked by CORS Policy' Error in React Apps

Access to fetch at 'http://api.example.com' from origin 'http://localhost:3000' has been blocked by CORS policy

reactcorsapifetch

reactintermediate

Fix 'useLayoutEffect does nothing on the server' Warning in React SSR / Next.js

Warning: useLayoutEffect does nothing on the server because its effect cannot be encoded into the server renderer's output format. This will lead to a mismatch between the initial, non-hydrated UI and the intended UI.

reactnextjsssruseLayoutEffect

reactintermediate

Fix 'Warning: An update to inside a test was not wrapped in act(...)' in React Testing

Warning: An update to ForwardRef inside a test was not wrapped in act(...). When testing, code that causes React state updates should be wrapped into act(...).

reacttestingactreact-testing-library

reactbeginner