Before I pass the string to that function, I want to verify whether the received string is in correct JSON format

I know that I can catch the error in particular function can be caught by using $@ variable

I'm confused. You've just answered your own question. 

my $valid = eval { $json->decode($input); 1 };

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In reply to Re^3: JSON Formatted String by ikegami
in thread JSON Formatted String by nvivek

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