longitude.replace is not a function

longitude.replace is not a function typically occurs when you try to use the replace method on a variable that is not a string. The replace method is used to replace occurrences of a specified value with another value in a string.

To fix this issue, make sure that the variable "longitude" is a string before using the replace method. You can do this by converting it to a string using the toString() method. Here's an example:

let longitude = 123.456;
longitude = longitude.toString();
longitude = longitude.replace('.', ',');

In this example, the toString() method is used to convert the number value of "longitude" to a string. Then, the replace method replaces the dot (.) with a comma (,).

Make sure to adjust the code according to your specific use case.