How to check file MIME type with javascript before upload?

How to check file MIME type with javascript before upload?

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When to use the JavaScript MIME type application/javascript instead of text/javascript?

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What is the javascript MIME type for the type attribute of a script tag? [duplicate]

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Resource interpreted as Script but transferred with MIME type text/plain - for local file

javascript html google-chrome mime-types

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text/javascript vs application/javascript [duplicate]

javascript mime-types

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Why write <script type="text/javascript"> when the mime type is set by the server?

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"not well-formed" error in Firefox when loading JSON file with XMLHttpRequest

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Debug message "Resource interpreted as other but transferred with MIME type application/javascript"

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Resource interpreted as other but transferred with MIME type text/javascript?

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is "<script type='text/javascript'>" incorrect?

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Express: Setting content-type based on path/file?

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Download a string as .txt file in React

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image.onError event never fires, but image isn't valid data - need a work around

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UTF-8 encoidng issue when exporting csv file , JavaScript

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jQuery or JavaScript: get MIME type of client file

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