uncaught (in promise) syntaxerror: unexpected token
Akash Mittal
React throws error uncaught (in promise) syntaxerror: unexpected token < in json at position 0, when it is not able to find the JSON file. But why this happens? Because…
Browsing Tag
reactjs error
34 posts
React hook useeffect has a missing dependency
Eslint throws react hook useeffect has a missing dependency when we include partial dependency parameters. It says you should either include all or none. This is just a warning and…
React Error – jsx expressions must have one parent element
React throws the error, jsx expressions must have one parent element, when you try to return JSX without having any enclosing container element. This is a very common error and…
You should not use route or withrouter() or Link outside a router
React router throws the error, “you should not use route or withrouter() outside a router” when you have not defined BrowserRouter and still using Link or NavLink or Router components.…
could not find a declaration file for module – React TypeScript Error
React Typescript throws the error, could not find a declaration file for module, due to number of reasons. Check out the possible solutions to solve the issue – Suppose your…
‘react-scripts’ is not recognized as an internal or external command
React throws error ‘react-scripts’ is not recognized as an internal or external command, when either react-scripts is not installed or there is folder permission errors. Follow these steps to solve…
React Error – module not found: can’t resolve
React throws the error, module not found: can’t resolve, when either the module is not defined or its path is incorrect. Case 1: When module is not defined If the…
React Error: target container is not a dom element
React throws the error, target container is not a dom element, when we include the build script before the root element. The solution is to always include the build scripts…
React Error – Each child in a list should have a unique “key” prop
React throws error, each child in a list should have a unique “key” prop when you do not provide key prop in the list item. Let’s understand what this is…
React Error – cannot read property ‘setstate’ or ‘state’ or ‘props’ of undefined
So, you got the React error – cannot read property ‘setstate’ or ‘state’ or ‘props’ of undefined? Alright. Let’s see why it happens and how to solve it. We use…
React typeerror: cannot read property ‘map’ of undefined
React throws typeerror: cannot read property ‘map’ of undefined, when we try to use anything but arrays. According to MDN documentation – The map() method creates a new array populated with the results of…
React – Expected an assignment or function call and instead saw an expression no-unused-expressions
React throws the error “expected an assignment or function call and instead saw an expression no-unused-expressions” in the situations when we wrongly put parenthesis () and curly braces {}. You…
Can’t perform a react state update on an unmounted component – Code
(Jump to Solution | Code | Demo) There are number of situations when you get the warning, “Can’t perform a react state update on an unmounted component“. One thing is…
React error – objects are not valid as a react child
To solve objects are not valid as a react child error, check if the JSX element has javascript object as child, like this – then instead of putting object as…