How to preview and validate an image before uploading in javascript.

Опубликовано: 12 Март 2026
на канале: Digital Fox
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JavaScript tutorial.
It is a good practice to show the user a preview of a selected image,
and validate the image before uploading to the server.
It saves the users time.

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Learn about the FileReader API:
https://developer.mozilla.org/en-US/d...

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