Unexpected token '?'

get this error when npm run build

2 Replies

Hi @japope. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- The "Unexpected token" error during the build process can be caused by various issues, including syntax errors in your code or misconfigurations in your build setup. Based on the knowledge sources provided, here are some steps you can take to diagnose and fix this issue: 1. Check for Syntax Errors: Ensure that there are no syntax errors in your code. This includes checking for misplaced or missing characters such as commas, brackets, or parentheses. 2. Validate JSON Data: If your build process involves JSON data, make sure that the JSON is well-formed. You can use tools like JSONLint to validate your JSON data: - Go to JSONLint (https://jsonlint.com/). - Paste your JSON data into the input box. - Click the "Validate JSON" button. - Review and fix any highlighted errors. 3. Stringify JSON Objects: If you are working with JSON objects, ensure that you are stringifying them before sending them to a server or storing them. For example:

   localStorage.setItem("list", JSON.stringify(list));

   localStorage.setItem("list", JSON.stringify(list));

4. Use Try-Catch for JSON Parsing: Always use a try-catch block when parsing JSON to handle errors gracefully:

   try {  
     const data = JSON.parse(jsonString);  
     console.log("Parsed data:", data);  
   } catch (error) {  
     console.error("Error parsing JSON:", error);  
   }

   try {  
     const data = JSON.parse(jsonString);  
     console.log("Parsed data:", data);  
   } catch (error) {  
     console.error("Error parsing JSON:", error);  
   }

5. Check for Spelling Errors: Ensure that there are no spelling errors in your API endpoints or local storage keys. Spelling errors can lead to unexpected token errors when the application tries to parse an invalid JSON response. 6. Transpile Node Modules: If you are using Next.js with Ant Design and encounter issues during the build, you might need to transpile certain node modules. Add the necessary packages to the transpilePackages array in your next.config.js file:

   transpilePackages: [
     '@pankod/refine-antd',
     'antd',
     '@ant-design/pro-components',
     '@ant-design/pro-layout',
     '@ant-design/pro-utils',
     '@ant-design/pro-provider',
     'rc-pagination',
     'rc-picker'
   ],

   transpilePackages: [
     '@pankod/refine-antd',
     'antd',
     '@ant-design/pro-components',
     '@ant-design/pro-layout',
     '@ant-design/pro-utils',
     '@ant-design/pro-provider',
     'rc-pagination',
     'rc-picker'
   ],

If you continue to face issues, you might want to refer to the detailed blog post on handling JSON errors: Unexpected token in JSON at position 0 error (https://refine.dev/blog/unexpected-token-in-json-at-position-0-error/). For more specific help, you can also check the Discord support thread (https://discord.com/channels/837692625737613362/1263537364962377728) or the GitHub issue (https://github.com/refinedev/refine/issues/3578) related to your problem. If these steps do not resolve your issue, please provide more details about the error message and your project setup. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ----------------------

kapa.ai•4w ago

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