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You can use the toLocaleString() method in Javascript to transform a decimal format into a string with a specific format. The toLocaleString() method accepts a variety of options, including specifying the language, number of decimal places, and formatting style.

Here's an example:

const number = 12345.6789;
const formattedNumber = number.toLocaleString('en-US', {
  style: 'currency',
  currency: 'USD',
  minimumFractionDigits: 2,
  maximumFractionDigits: 2,
});
console.log(formattedNumber); // "$12,345.68"

In this example, we're converting the decimal number 12345.6789 to a string with a currency format using USD as the currency symbol. We're also setting the minimumFractionDigits and maximumFractionDigits options to 2 to ensure that there are always two decimal places.

You can customize these options to match the specific formatting style you need. Additionally, you can use the toLocaleString() method to format numbers for a variety of languages and regions.