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Discussion on: File upload using Laravel and Vue.js (The Right Way)

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Diogo Kollross Author

Because when making a request encoded as multipart/form-data (which is a requirement for file uploads) all you can send is a flat list of name=value pairs - where value may either be a string or a file.

If you try to add an array or an object directly to the FormData object, it will be implicitly converted to a string, which is probably not what you want (resulting in, for example, "[object Object]" or "12,15,28,55").