How to check the file type using javascript.

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I have a requirement to upload only.PDF file, it returns application/pdf mime type.But if I just change the file extension of .txt file to .PDF file then it returns mime type as application/pdf and getting uploaded.Is there any way to check it safely so that some user doesn't just upload unnecessary file.

What I have tried:

I checked the extension and also checked the MIME type of PDF file.

Posted 26-Jul-17 0:26am

Member 13329658

Updated 26-Jul-17 1:56am

OriginalGriff

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F-ES Sitecore · Answer 1 · 2017-07-26T01:00:00

Solution 1

validate pdf file javascript - Google Search[^]

Posted 26-Jul-17 1:00am

F-ES Sitecore

Satya Prakash Swain · Answer 2 · 2017-07-26T01:56:00

Solution 2

I could understand that, either we will
1) check the file extension or
2) check the MIME type

I could help with this article though to check the file signatures. Please try. File Signatures[^]

Posted 26-Jul-17 1:56am

Satya Prakash Swain