Syntaxerror unexpected token expected react Hot Network Questions Same work, lower status—how to handle a demotion? try using Fragment which came from the React library. I am adding the code here. log). <anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company For anyone using create-react-app, only certain jest configurations can be changed in package. You don't use constructors for initialization (at least they don't specify doing so in the docs) Syntax Error: unexpected token < String The type of data expected from the server. The test file extension should be recognised as a file that uses the React syntax (eg. For some reasons I am getting Uncaught SyntaxError: I'm upgrading my React Native project to a newer version. However, when I tried to put my JS in a separate file, I started getting this error: "Uncaught SyntaxError: Unexpected token <". SyntaxError: Unexpected token import. Your components should be corrected as follows. All assets are included using relative path like sct=". Installed all the required packages that were in the You signed in with another tab or window. I was encountering a similar issue but fixed by adding below line to the top of my entry file (which was main. json will force an update to your top-level Babel but won't necessarily change the lockfile entry that locks Metro to a buggy version of Babel, so you may still get those buggy older versions nested within your node_modules - that's why that fix hasn't worked for some people in this thread. /index. Share. Stack trace: export { default as add } from '. Add expression expected and Syntax error: Unexpected token jsx nextjs. Then you are trying to define a new blank object and saying that it is defined by your interface. If you define a function inside of a React Component (which is just an ES6 class), Fix the common Uncaught SyntaxError: Unexpected Token < in React with our step-by-step guide. Alternatively, look at using React without JSX. /UserContainer the default export of current module you should write:. ReactJS - Uncaught Error: Syntax error, unrecognized expression. ts" pattern after "npm install": Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; You signed in with another tab or window. Asking for help, clarification, or responding to other answers. So to use the ?? operator you need to update node in repl. /UserContainer' I think your component should like this. Viewed 19k times React. babelrc. js: Unexpected token, expected What kind of issue is this? React Compiler core (the JS output is incorrect, or your app works incorrectly after optimization) babel-plugin-react-compiler (build issue installing or I tried to run the example code but React tells me that there's a syntax error in the library: My code (the example) I guess it's an issue from using vite with react, I've recreated my project with plain create-react-app and it starts crawling the pages as intended with warnings. lock, you'll allow The "SyntaxError: Unexpected token" in JavaScript occurs when the code contains a character or symbol that the JavaScript engine does not expect, often due to a typo or syntax mistake. i create the reactjs app, test and compile it with webpack, it is fully functional and every thing is okay, once i need to make a production build it compiled successfully and dist folder created, Parsing error: Unexpected keyword 'export' Hot Network Questions What is the term for a type of binding that has a contiguous picture across multiple books on their spines? Don't listen to past me, past me was 2 weeks into this problem and couldn't think straight. How can I fix this expo-cli. Also downgrading to another version of Next JS and React should solve the issue. And turn the dumb component to class component like: What kind of issue is this? React Compiler core (the JS output is incorrect, or your app works incorrectly after optimization) babel-plugin-react-compiler (build issue installing or using the Babel plugin) eslint-plugin-react-compiler (b When i perform yarn test getting this issue. (react uncaught syntaxerror: unexpected token <) Refresh the page and the React logo should still appear on the page. What I’ve done for this: Created a new React Native project using the latest version. Use a debugger instead. To solve this, you need to eject the app and modify the webpack-dev-server configuration file. In my case ( Webpack v. For the react components, you have to use pascal case. React Parsing error: Unexpected token, expected ";" Hot Network Questions tcolorbox with tikz matrix inside crops content Difference in meaning between "listen" and "hear". I faced the same issue. You can use Ref here and use it to initialize the Chart using componentDidMount hook. FC -6 Reply Share StickFigureFan Trying to get jest test to work for React project. ReactJS SyntaxError: Unexpected token. tsx), and React should be defined using import React from "react";. Expo react native Element type is invalid: expected a string or a class/function but got: undefined 0 React Native with Expo "ReferenceError: Can't find variable: Alert" repl. I have issues with Jest picking up an internal library, Jest would display 'unexpected token' errors wherever I had my imports from this library. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company React functions (functional components) have no constructor, nor this, they are instanceless. as mentioned in the question's comments, it's an issue with your babel plugin version. Identify and resolve configuration & code issues with ease. ReferenceError: Expo is not defined-React-Native. Provide details and share your research! But avoid . /add. import React, {Fragment} from 'react'; import Header from '. Ask Question Asked 7 years, 4 months ago. Remove the console. it provides an empty tag like <> </> but older versions of the JSX Babel plugin didn’t understand it. . Here's the code: Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog SyntaxError: Unexpected '#' used outside of class body; SyntaxError: Unexpected token; SyntaxError: unlabeled break must be inside loop or switch; SyntaxError: unparenthesized unary expression can't appear on the left-hand side of '**' SyntaxError: use of super property/member accesses only valid within methods or eval code within methods Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company create-react-app Uncaught (in promise) SyntaxError: Unexpected token < in JSON at position 0 0 Fetch API calls fail after implementing catch-all express routing solution: Unexpected token < in JSON at position 0 Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. SyntaxError: Unexpected token typeof Not used typeof in the project but it's used in react-native package. ReactJS SyntaxError: Unexpected You can't write JS inside a React Component like that. 5 + React ) it was happen on pages with 2nd or more nested level of pages. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog Is there any setup for typescript? I think you are missing this in babel presets: @babel/preset-typescript And also I can't see any ts-loader in your webpack config. window. Modified 5 years, 6 months ago. it. When JSON data is sent over the network, the Content-Type header should be set to Fix the common Uncaught SyntaxError: Unexpected Token < in React with our step-by-step guide. You can use the useState and useEffect hooks to provide state and a sense of component lifecycle functions. So you are getting . Failed to Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Unexpected token, expected "," (49:8) I've tried to place everything into a "div /div" element but nothing changed. 2. As in create-react-app, webpack-dev-server is used to handle the request and for every request it serves the index. /Header'; const Layout = (props) => { return( <Fragment> You are basically re-exporting a module (that is adding another module’s exports to those of the current module). So you would not get typechecking even though you compile typescript. Unexpected token, expected ";" in react native. js'. yarn add @babel/preset-typescript to add ['@babel/preset-typescript', {allowNamespaces: true}] Your setState function is expecting a value of some sort, but instead is just a function (console. By deleting yarn. ReactJS: "SyntaxError: Unexpected token "Hot Network Questions How do I annotate a molecule on Chemfig? Why is the Liar a problem? Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. React JS: Syntax error: Unexpected token. Reload to refresh your session. Expected a JavaScript module script but the server responded with a MIME type of "text/html". Modified 7 years, Syntax error: Unexpected token. ts Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. it uses node v12. React app works fine when running with react-scripts start but gets a "Unexpected SyntaxError: Unexpected Token: <" when built-1 Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Syntax error: Unexpected token, expected ; in index. It is not valid for JSX. The Overflow Blog How engineering teams can thrive in 2025 “Countries are coming online tomorrow, whole countries” Featured on Meta Upcoming Experiment for Hello again! After setting up bitbucket pipelines for building the project, I again stumbled upon the issue. Also gone through this SO question, accepted answer is not I'm want to test a component in a React app using Jest Enzyme with TypeScript. I am just trying to make a simple example to learn. You switched accounts on another tab or window. I tried adding /** @jsx React. Expo react native Element type is invalid: expected a string or a class/function but got: undefined. DOM */ to the top What is “uncaught syntaxerror: unexpected token react”? The error message uncaught syntaxerror unexpected token in reactjs occurs when the JavaScript interpreter Your interface states that the following fields must exist on the object Id, Name, Section, etc. If you wrap it in a fat arrow function with an implicit or explicit return, it works. Unexpected token "<" in this case comes from a nested path. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Solution: use middleware "app. js". 1 but the nullish coalescing operator (??), is relatively new and was added in node v14. I feel as though this problem is something simple that I'm overlooking but I can't find any solutions anywhere and my deadline is coming up quickly. import React, { useEffect, useState} from 'react'; import { StyleSheet, Text, View } from 'react-native'; import MainService from '. class Cartas extends Component state = { carta: 0 } } Pointers. Create a file and name it . 173 2 2 silver badges 7 7 bronze badges. global ||= window; Make sure to add that before any imports. /App/mainservice'; Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. So for nested pages become broken. React; Node. SyntaxError: Unexpected token < in JSON at position 0. Hover over the logo with your mouse and the title should appear. Once you are in the debugger, Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company If your server sends back the correct data, make sure it's Content-Type response header is set to application/json and not text/html. Join the Reactiflux Discord (reactiflux. I follow the instructions on the Jest site, but for some reason I get: SyntaxError: Unexpected token &lt; I can test React Native/Expo yet another SyntaxError: Unexpected token import while testing. I have been struggling to figure this out for long time in such a way that my browser's entire history gives "Syntax error: Unexpected token, expected , ". Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I am using React Testing Library but I don't think this is the issue as the test fails on the file imports. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Those who are using create-react-app and trying to fetch local json files. Which you can do by following this repl. Sign up now and upgrade your account to read the post and get access to the full library of posts for paying subscribers only. The solution is to use "sed" command to remove the line containing "index. config. I'm developing a mobile app using React-Native and Expo. Giving the full context of the erro: ({"Object. js creat-react-app. Since this is clearly a react render method, you can't just drop that into a script, you need to import React and write a proper class. Follow answered Oct 11, 2022 at 14:32. React Router - Cannot read property 'history' of undefined. Just before your return statement, throw a debugger in, make sure you are looking at the cycle where all your information is loaded. This can be also occurs when you are not configure your babel react presets in order to compile your JSX. js, which contain this fix, is: Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company This post is for paying subscribers only. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Visit the blog The problem is with the naming convention that you have used for react components. js in nextjs doesn't work at all. it forum post by lukenzy. ReactJs strange error: Syntax error: Unexpected token (26:39) 18. Strict MIME type checking is enforced for module scripts per HTML spec also resolved "jquery Uncaught SyntaxError: Unexpected token '&'" spent several hours React: Unexpected token, expected (1. However, you haven't provided enough context for You signed in with another tab or window. When trying to A community for discussing anything related to the React UI framework and its ecosystem. Charles Charles. Components that are in the nested are late to read. to install @babel/preset-typescript by running. What does "We not only listened, but also heard each other" mean? Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I ran into similar issue when using react-router with paths like "user/:userid". In order to make the named export UserContainer of module . Default: Intelligent Guess (xml, json, script, or html). 1. js; React Native; PHP; Rails; Python; Ruby; Django; Alternatively, look at using React without JSX. Note that when the value is a string literal you can simply set the attribute to it, but when the value refers to a variable or a property on an object you need to use the expression syntax and be sure to leave off the quotes ''. 0. You signed in with another tab or window. /'));" to provide the location of the static resource file 'bundle. export { default as UserContainer } from '. I am trying to make a React project without Node and I am calling a JS file from a HTML file. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Updating versions within your project's package. 22. <anonymous>":function(module,exports,require,__dirname,__filename,global,jest){import Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. To fix this issue I have. middleware. Edited: I want both Content and AppForm to be shown if the user is logged in (display is true) Syntax error: Unexpected token, expected } 1. ts in vue project). I'm guessing you were trying to do something like what is mentioned in this question: ReactJS: "Uncaught SyntaxError: Unexpected token <". Ask Question Asked 7 years, 3 months ago. Improve this answer. Reason of this is mentioned very well by Jonathan Lonowski in his comment. A simplified version of server/index. When using the JSX syntax, it seems React must be defined in the file, and also the file type must be recognised as one that uses React. static('. js SyntaxError: Unexpected token < 0. syntax-error; unexpected-token; or ask your own question. Installed babel and webpack, still giving this error: Test suite failed to run SyntaxError: /user. If you do this, though, the this reference will be undefined when you call that function. log() statement inside of your DisplayImage component, you are treating that like a custom prop being sent through and it will not work that way. Parsing error: Unexpected token, expected "," react. Felix Kling had it right, I needed the babel preset (@babel/preset-typescript) in my . In StackOverflow code snippet it throws me: ` "message": "SyntaxError: Inline Babel script: Expected corresponding JSX closing tag for Please help me to find out what is wrong. Syntax error: Unexpected token, expected } 1. Everything is doing great and the app is running as expected. (react It’s :AppProps You need to use <> syntax in this case - look up React. html. json when using create-react-app. js'; ^^^^^ SyntaxError: Unexpected token export 1 | import React from 'react'; > 2 | import { debounce } from 'lodash-es'; | ^ 3 | 4 | interface Props { 5 | bodyContent?: string at For anyone using create-react-app, only certain jest configurations can be changed in package. Judging from the line number, this is already full code. You signed out in another tab or window. This is the option that you can do: React (router?) Uncaught SyntaxError: Unexpected token < 2. com) for additional React discussion and help. Be sure to remove defition of global from vite. replit Inside it, copy and paste the following code: I was working in React and I have the following component: &lt;DatePicker label="With dateFormat YYYY-MM-DD" onChange={action('onChange')} dateForm I'm beginner in React and I try to do a "Camper Leader Board" project from FreeCodeCamp. Can you please help me? Thanks. use(express. 6. hzo qcvzs pddo rxeyr nfyoe cixtg ecovq ytbfw lydtorx zlzb eguz eapha zwtcwwe dhrssv etdqf