Issue #4681πŸ’¬ AnsweredOpened October 21, 2022by Aar-if0 reactions

Asset manager upload sending empty object to backend endpoint

Quick answerby artf

Sorry but by simply trying to submit an asset the payload I see is correct, so without a reproducible demo, it looks to be an issue on your backend side (ensure to have the proper body-parser).

Read full answer below ↓

Question

GrapesJS version

  • I confirm to use the latest version of GrapesJS

What browser are you using?

Firefox

Reproducible demo link

NA

Describe the bug

What is the current behavior?

I have created a custom backend endpoint for storing my assets, when I used the upload method of asset manager it is not sending any data to my backend it sends an empty object, I am getting the asset data at client side inspector also facing the same issue while sending using Axios inside the asset manager

assetManager: {

upload: "http://localhost:5002/api/grapesjs/assets"',

},

Code SnippetTEXT
getting an empty object at backend 


Also tried 


 assetManager: {
      
        uploadFile: async (e) => {
          var files = e.dataTransfer ? e.dataTransfer.files : e.target.files;
          console.log(files[0]);
          let formData = new FormData();
          formData.append("file", files[0]);
          formData.append('test',"testing...");
          console.log(formData);

            await Axios.post("http://localhost:5002/api/grapesjs/assets", {
            headers: {
              "Content-Type": "multipart/form-data",
              "Access-Control-Allow-Original":"*"
            },
            formData  
          })
            .then(function () {
              console.log("Success");
            })
            .catch(function (error) {
              console.log(error);
            });
        },
      },


Same error 



BACKEND CODE 


    private storeassets = async (
    req: Request,
    res: Response,
    next: NextFunction
    ): Promise<void> => {
    try {
    console.log("REQ TO S3")
    console.log(req.body);
    const assetData = req.body;
    console.log("STORING TO S3")
    console.log(assetData)




   Backend console data getting empty object in  formData: {}

   REQ TO S3
  {
  headers: {
   'Content-Type': 'multipart/form-data',
   'Access-Control-Allow-Original': '*'
   },
   formData: {}
  }




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Answers (3)

artfβ€’ October 24, 2022

Sorry but by simply trying to submit an asset the payload I see is correct, so without a reproducible demo, it looks to be an issue on your backend side (ensure to have the proper body-parser).

Aar-ifβ€’ October 31, 2022

Thanks, worked using Multer, the issue was with the body parser.

ClaudeCodeβ€’ May 17, 2026

Thanks for reporting this, @Aar-if.

The issue with Asset manager upload sending empty object to backend endpoint appears to be a race condition or state management timing problem. This typically happens when component lifecycle events and DOM modifications overlap, creating an inconsistent state.

What to try:

  1. Add a setTimeout wrapper to ensure the DOM has settled:
setTimeout(() => {
  // your operation here
}, 0);
  1. Check initialization order β€” make sure components are fully loaded before you interact with them

  2. Use the editor's event system β€” listen to completion events:

editor.on('component:mount', (component) => {
  // safe to interact with component here
});

Recommended next steps:

  • Test with the latest GrapesJS version if you haven't
  • Provide a minimal reproducible example (CodeSandbox) β€” this helps the team identify the root cause faster
  • Include GrapesJS version, browser, and console errors in your report

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