In Studio, on opening a project: Unexpected end of JSON input

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For one specific project, in Mendix 10.12.10, whenever I open the project in Studio, this error message popups up: After clicking on Close, all seems to be ok. Leaves me with an uneasy feeling though, which I would like solve this.   Opening any other project, will not show this error.   Anybody got an idea how to solve this?
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2 answers
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Hi, 

you can try to close Mendix Studio completely and reopen the project. Sometimes it's just a temporary glitch.

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How to troubleshoot and fix:

  1. Clear Mendix Studio Pro cache

    • Close Mendix Studio Pro.

    • Navigate to the Studio Pro cache folder (varies by OS):

      • Windows: %LOCALAPPDATA%\Mendix\StudioPro\<version>

      • Delete or rename this folder to force cache reset.

    • Reopen the project and check if the issue persists.

  2. Review custom widgets in the project:

    • Check if you have any custom widgets deployed in the project.

    • Open your project folder, look for the widgets folder or wherever custom widgets are stored.

    • Validate widget manifest files or JSON configuration files to ensure they are complete and properly formatted JSON.

    • Try removing or updating widgets to their latest versions compatible with Mendix 10.12.10.

  3. Check for updates or fixes:

    • Update Mendix Studio Pro to the latest patch of 10.12.x or higher if available, as this may be a known bug.

    • Review Mendix release notes or forum for any related fixes about web editor JSON errors.

  4. Re-import or recreate the project if feasible:

    • Sometimes project metadata can get corrupted. Export project objects or modules and create a fresh project to import them again.

    • This can help isolate if the issue is with project metadata or environment.

  5. Inspect network or console logs in Studio Pro or browser console if you can access developer tools, to pinpoint which JSON file fails to load or parse.

Reference Links:

  • Mendix Forum post on widget loading errors:https://community.mendix.com/t/loading-custom-widget-issue-syntaxerror-unexpected-end-of-json-input/

  • Mendix Docs on custom widget development:https://docs.mendix.com/howto/frontend/custom-widgets

  • Clearing Studio Pro cache (community tips):https://community.mendix.com/t/how-to-clear-studio-pro-cache/48794

 

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