JavaScript How can I block html and urls in my input form [duplicate]

Freeze your requirement around username e.g. alphanumeric including special chars and Max length etc. Write validation logic using javascript regular expression. Reject everything else that fails.

Answer:1

Client side (HTML/Javascript) validation is only to be nice and responsive to the user, it can always be circumvented by a malicious user. Any validation needed should be done server side even if it repeats validation done on the client side.

Answer:2

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