How to Convert Decimal Degrees to DMS Coordinates Using JavaScript

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Geographic coordinates are commonly stored as Decimal Degrees (DD), but are often displayed in the Degrees, Minutes, and Seconds (DMS) format for human readability. Converting DD to DMS involves extracting the integer part as degrees, then multiplying the fractional remainder by 60 to derive minutes and seconds. A key challenge in JavaScript is floating-point precision, which can produce excessively long decimal values for seconds. This is typically resolved by rounding seconds to two decimal places using toFixed(2). The conversion process also requires determining the correct directional suffix — North, South, East, or West — based on the sign of the original coordinate value.

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