How do I fix NaN error in JavaScript?

How to convert NaN to 0 using JavaScript ? Using isNaN() method: The isNan() method is used to check the given number is NaN or not. Using || Operator: If “number” is any falsey value, it will be assigned to 0. Using ternary operator: Here number is checked via ternary operator, similar to 1, if NaN it converts to 0.

What causes NaN JavaScript?

By definition, NaN is the return value from operations which have an undefined numerical result. Hence why, in JavaScript, aside from being part of the global object, it is also part of the Number object: Number. NaN. It is still a numeric data type , but it is undefined as a real number .