What I need:

• Deserialize Json string to and object
• Do some stuff
• return it as a string at the end

What is the problem?
When Json has property like {“foobar” : 0.0000000000000000001}, it is converted as a number, but then as a string it is represented in scientific notation as 1E-19

Is there a way to read number from json as a string, or convert such a number later to exact same string, without any precision loss? Precision is not fixed and number in json can occur in any property.
Usage of Newtonsoft is preferable (if it’s possible) over System.Text.Json

I’ve tried to

1. create Newtonsoft’s CustomJsonConverter
2. use System.Text.Json.JsonNumberHandling.WriteAsString
3. converting float to string
   but any of this solutions didn’t work
4. I couldn’t find a way to treat any number value as a string, idk if it’s even possible in such converter
5. This one I think works only one way, from obj to string, and this is not what I’m looking for
6. such a conversion didn’t work because it lost a precision, or did “over precision” (0.00…01 was written as 0.00…0989919999 or smth like this), or added additional zeros at the end – depends what formatting I’ve used

Ideally I’d like to convert string like {“foobar”: 21.37} to object with property foobar = “21.37” to be sure that any precision won’t be lost after coverting between number/string