To get the number of forms in a document, use the form property with length property in JavaScript.
Example
You can try to run the following code to get the number of forms in a document −
<!DOCTYPE html> <html> <body> <form> Name: <input type="text" name="my_name" value="Amit"> Subject: <input type="text" name="my_subject" value="Java"> <input type="submit" value="Submit"> </form> <script> var val = document.forms.length; document.write("<br>Number of forms in the document: "+val); </script> </body> </html>