What methods can be used to ensure the decimal point is preserved when parsing JSON data?

When performing this action...

var data = JSON.parse('{"myNum":0.0}') ;

If you access data.myNum, the output will be 0. (Understandable.)

However, if you execute data.myNum.toString(), the result will be "0".

The main goal is to convert it into the string "0.0".

In reality, I don't have control over the JSON input as it comes from a web service... The intention is to parse the JSON using the browser's JSON parser and differentiate between numeric values of 0 and 0.0.

Is there a way to achieve this without manually examining the JSON string? Given the necessity to utilize the browser's native JSON parser for efficiency. (This pertains to a Chrome extension only, compatibility with other browsers is not essential.)

javascriptjsongoogle-chrome

Answer №1

Unfortunately, there is no straightforward method to extract the number of digits from either JSON.parse or eval. Even if IBM's decimal proposal had been integrated by the EcmaScript committee, the value will ultimately be converted into an IEEE 754 floating point number.

If you're interested in maintaining precision details during parsing, I recommend exploring a basic JSON parser available at http://code.google.com/p/json-sans-eval/source/browse/trunk/src/json_sans_eval.js that can be customized accordingly.

Answer №2

When 0.0 is presented without quotes in your JSON (as a number, not a string), it can become indistinguishable from 0 unless you create your own JSON parser.

Answer №3

... parsed.myNum rounded to 1 decimal place ...

where 1 represents the number of decimal places for rounding

Edit: The value of parsed.myNum is a number, whereas parsed.myNym.toFixed( 1 ) would result in a string

Edit2: To handle this scenario, input the value as a string {"myNum":'0.0'}, parse it when performing calculations, or identify the decimal separator and adjust accordingly based on whether a number or string output is needed

Answer №4

Does it make a difference? The value 00000.00000 equates to 0. When you attempt to parse JSON.parse('{"myNum":0.00001}'), the result will be { myNum=0.0001 }. To retain the decimal, you must store it as a string like so: JSON.parse('{"myNum":"0.0"}')

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