Sure, here are the steps on how to limit file upload to only accept the following mime types: "image/jpg, image/jpeg, image/png, image/svg+xml, image/gif, image/webp" in a React app:

Import the FileReader and FileList objects from the FileAPI module.
Create a function that will be called when the file input changes. This function will need to check the file type and return a boolean value indicating whether or not the file is allowed.
In the onChange event handler for the file input, call the function you created in step 2. If the function returns false, prevent the default action from being executed.
Append the file to the formData object only if the function returned true.
Here is an example of how to do this:

import React, { useState } from "react";

const App = () => {
  const [files, setFiles] = useState([]);

  const handleFileChange = (e) => {
    const files = e.target.files;
    setFiles(files);
  };

  const isImage = (file) => {
    const mimeType = file.type;
    return mimeType === "image/jpg" ||
           mimeType === "image/jpeg" ||
           mimeType === "image/png" ||
           mimeType === "image/svg+xml" ||
           mimeType === "image/gif" ||
           mimeType === "image/webp";
  };

  const handleUpload = () => {
    const file = files[0];
    if (!isImage(file)) {
      alert("Please select an image file.");
      return;
    }

    const reader = new FileReader();
    reader.onload = () => {
      const image = reader.result;
      // Do something with the image here.
    };
    reader.readAsDataURL(file);
  };

  return (
    <div>
      <input type="file" onChange={handleFileChange} />
      <button onClick={handleUpload}>Upload</button>
    </div>
  );
};

export default App;

export default App;
This code will limit the file upload to only accept files with the following mime types: "image/jpg", image/jpeg, image/png, image/svg+xml, image/gif, image/webp". If the user tries to upload a file with a different mime type, an alert will be displayed.


small extra edit I have made which fixes the code : I removed the import { FileReader, FileList } from "FileAPI"; line, as FileReader and FileList are globally available Web APIs and not a part of a module named "FileAPI". Additionally, since you're using React, it is not necessary to use preventDefault() in the onChange event handler as you mentioned in the steps. The code now handles image validation, displays an alert if an unsupported file is chosen, and reads the image as a DataURL if a valid image is selected.
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