isEmail

The isEmail function checks if a string matches the format of a valid email address.

Syntax

isEmail(value)

Parameters

Parameter	Type	Description
value	string	The string to be checked.

Return

Type	Description
boolean	Returns true if the string matches the format of a valid email, otherwise returns false.

Examples

isEmail('user@domain.com');      // true
isEmail('user.name@domain.com'); // true
isEmail('user@domain');          // false
isEmail('user@.com');            // false
isEmail('user@domain.c');        // false
isEmail('');                     // false

Notes

• Throws a TypeError if the provided value is not a string.
• Only validates the basic email format; does not check if the domain exists or is active.

References

• MDN: String.prototype.test()
• RFC 5322: Internet Message Format