How to validate an Image extension with Express Validator?

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Good nigth to everyone. Im just finishing my first course to start programming and Im having lot of problems to validate an image extension using express-validator.

I need to validate an image to be "PNG", "JPEG", "JPG", or "GIF". I tried a few things but nothing worked. Some advice will be great for me, thank you in advanced.

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Lyes On

The validator package would be more adaptable for this stuff, you can use isIn for this

req.checkBody( "your extension" ).isIn([ "PNG", "JPEG", "GIF" ]);