The error “Tofixed is not a function” is quite common in JavaScript. But no worry; fixing them does not call for much complicacy. Check out these three methods (as long as their accompanied examples) for further understanding. 

Why Does This Error Occur?

Before we dive into the solution, it helps to analyze why the error occurred in the first place.

Overall, this error takes place whenever you call the method toFixed() on one value that isn’t a number. Hence, whichever solution you choose, you must make sure the numbers are involved: either convert that value to numbers or only use the method toFixed() on numbers in the first place.

How to Fix The Error “ToFixed Is Not A Function” in JavaScript

Keep these three methods in mind:

• Method 1. Convert strings to numbers
• Method 2. Parse a value to numbers
• Method 3. Assess the variable category

The next section will delve further into specific examples for each approach.

Method 1. Convert Strings to Numbers

The method toFixed() formats number. However, your faulty code currently entails type strings, which is why string concatenation happens instead of an arithmetic addition. Hence, the solution is to convert them into numbers first.

Example 1:

• The original code:

var totalSum = (grandTotal + getDeliveryCost).toFixed(3);

• The new code after conversion:

var totalSum = (Number(grandTotal) + Number(getDeliveryCost)).toFixed(3);

Example 2:

• The error:

const num = '234';

// Uncaught TypeError: num.toFixed is not a function

const result = num.toFixed(2);

• The solution:

const num = '234.567';

const result = Number(num).toFixed(2);

console.log(result); 

Method 2. Parse A Value to Numbers

The method ToFixed is unavailable for non-number values, which is why you should parse a value to a Number first. Only then can you pick up the method ToFixed.

In this example, we picked up a ternary operator, quite similar to the statement if/else. Next, we checked whether that num variable contains numbers. If the answer is a yes, the system will return the outcome of calling Tofixed. 

Example 1:

const num = null;

const result = typeof num === 'number' ? num.toFixed(2) : 1;

console.log(result); 

Example 2: 

let str = `234.234567`

console.log(Number(str).toFixed(3))

console.error(str.toFixed(3))

Method 3. Assess the Variable Category

The last solution can be of help should the previous two fail. While we cannot guarantee 100% success, they sometimes work, so try it out!

All in all, only int and float values have a toFixed method. Hence, you can console the variable to identify its type.

Example:

The wrong code (resulting in error):

console.log(("5" + 6).toFixed(3)); 

The right code (which means it’s working):

console.log((6 + 6).toFixed(3)); 

Conclusion

Our article has delivered tips on fixing the error “toFixed is not a function”. Accompanying our guidelines are real-life examples to help you understand how they work. For guidelines on other similar Javascript errors (such as uncaught referenceerror), keep browsing our website.