Question 240349 in Javascript Question posted in
A very good W3school tutorial can be found here.

Javascript precision with more than 15 decimals

I have a string which I need to convert to number.

The thing is, I have 20 decimals and JS lose precision after 15 or 17 decimals, when trying to use parseFloat.

Example:

const number = "0.0000012726726461401083"
const parseNumber = parseFloat(number) // 0.0000012726726461401084

Y try to see if libraries like big.js or decimal.js could help me, but I didn’t find any solution.

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2

Answers


  1. 0

    What didn’t suit you about decimal.js ? It looks exactly like what you would need for that, so have a go at it and try to manually set the precision : https://mikemcl.github.io/decimal.js/#precision

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  2. 0

    You can use decimal.js like this:

    const number = "0.0000012726726461401083";
const decimalNumber = new Decimal(number);
console.log(decimalNumber.toString()); // Outputs: 0.0000012726726461401083
    <script src="https://cdnjs.cloudflare.com/ajax/libs/decimal.js/9.0.0/decimal.min.js"></script>
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