In React, how to format a number with commas?

Question

My API is sending React integers like 10, 31312, 4000.

In my React component, what's the right way to format these numbers like so:

from: 10, 31312, 4000
to: 10, 31,312, 4,000

Update

The number is being provided by my Rails API and rendered in a React component:

const RankingsList = ({rankings, currentUserId}) => {
  return (
      <div className="listGroup">
        {rankings.map((ranking, index) =>
            <span className="number">{ranking.points}</span>
        )}
      </div>
  );
};

Are you getting them as JSON? Can you elaborate a little bit why, and how you will be using them ? — DrunkDevKek, Jun 27 '17 at 15:54
Possible duplicate of [How to print a number with commas as thousands separators in JavaScript](https://stackoverflow.com/questions/2901102/how-to-print-a-number-with-commas-as-thousands-separators-in-javascript) — Jordan Running, Jun 27 '17 at 15:59

hassan ketabi · Accepted Answer · 2019-01-17T13:58:12.683

Print a number with commas as thousands separators in JavaScript

You can find a general JS solution for this:

toLocaleString:

// A more complex example: 
number.toLocaleString(); // "1,234,567,890"

// A more complex example: 
var number2 = 1234.56789; // floating point example
number2.toLocaleString(undefined, {maximumFractionDigits:2}) // "1,234.57"

NumberFormat (Safari not supported):

var nf = new Intl.NumberFormat();
nf.format(number); // "1,234,567,890"

source: https://stackoverflow.com/a/32154217/6200607

var number = 1234567890; // Example number to be converted

⚠ Mind that javascript has a maximum integer value of 9007199254740991

Other Solution:

https://css-tricks.com/snippets/javascript/comma-values-in-numbers/

2345643.00 will return 2,345,643.00

You link to a "CSS Solution" is just another JavaScript solution. — mikeschuld, Jan 03 '19 at 00:25

score 39 · Answer 2 · answered Jun 27 '17 at 15:59

I have a class which converts a number to either 31,312 or 31,312.00.

The code is pretty much;

return value.toLocaleString(navigator.language, { minimumFractionDigits: 2 });

and

return value.toLocaleString(navigator.language, { minimumFractionDigits: 0 });

So you can just use toLocaleString for converting.

Update

Based on your example, it would be (assuming points is a number);

const RankingsList = ({rankings, currentUserId}) => {
  return (
      <div className="listGroup">
        {rankings.map((ranking, index) =>
            <span className="number">{ranking.points.toLocaleString(navigator.language, { minimumFractionDigits: 0 })}</span>
        )}
      </div>
  );
};

However, you might want to just move this into a smaller component called NumberDisplay and a property to show/hide decimal points'

Thanks Tim, in your React app, are you storing this func in some type of global helper file? — AnApprentice, Jun 27 '17 at 16:04
@AnApprentice We have a component named NumericDisplay, which takes in a property for NumericFormat that is either NoneFractional or Standard. In this, we then use a NumericHelper file that will return the value. So we use the component in the majority of places, but can also use the helper if we want. — Tim B James, Jul 17 '17 at 09:53

score 4 · Answer 3 · answered May 11 '20 at 10:56

  export const formatNumber = inputNumber => {
    let formetedNumber=(Number(inputNumber)).toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,');
    let splitArray=formetedNumber.split('.');
    if(splitArray.length>1){
      formetedNumber=splitArray[0];
    }
    return(formetedNumber);
  };

Please note that I am ignoring the decimal points

score 2 · Answer 4 · answered Mar 23 '20 at 11:04

2

React component to format numbers in an input or as text: react-number-format

answered Mar 23 '20 at 11:04

paprika

517
5
12

Gilbert · Answer 5 · 2021-09-27T13:38:17.743

React boys, use this component.

// number cell
function NumberCell({ line, handleBlur, property, readOnly }) {
    function replaceNonNumeric(numStr) {
        return String(numStr).replace(/[^0-9]/g, '')
    }
    function commarize(numStr) {
        return Number(replaceNonNumeric(numStr)).toLocaleString()
    }

   
    useEffect(() => {
        setValue(commarize(line[property.name]))
    }, [line])


    const [value, setValue] = useState(line[property.name])

    const handleChange = e => {
        setValue(commarize(e.target.value))
    }

    function proxyHandleBlur(e) {
        e.target.value = replaceNonNumeric(e.target.value)
        return handleBlur(e)
    }

    return (
        <input 
            name={property.name}
            value={ value }
            onChange={handleChange}
            onBlur={proxyHandleBlur}
            type="text"
            readOnly={readOnly}
            />
    );
}

In React, how to format a number with commas?

Update

5 Answers5

Print a number with commas as thousands separators in JavaScript

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