Creating JSON with «bare hænds»

When you write software you mostly use contemporain software when each object has a method like «toJSON» or «parseAsJSON». But sometimes it happens that you need to create JSON string using an obsolete software version.
So you need to use some recursive function call or apply some graph theory knowledge.

It seems that to create a JSON string is simple, especially when you do not work with deeply linked objects but operate with data structures like a dataset returned from database.
But sometimes you can get come errors if you just create the string like `{«param_name»:»param_value_received_from_server_1″}` because not each param_value_received_from_server_1 is suitable for JSON especially if it contains some symbols having special role in JSON standard.

First of all you shoud reat the information at http://json.org/

There you can read about all allowed values and symbols.
If you string contains quotes or slashes you must add backslash before them like it is shown in the table below

After that you can create some valid JSON but only when your original strings do not contain some special character.

The symbols with ASCII code less than 32 is not suitable in your string.
The table below shows the way you should transform the symbols with code less than 32

It should be noticed each symbol can be presented in «\uXXXX» form where XXXX is just its code.
For example in JavaScript JSON.parse(‘\"\u0052\"’) will correcly parse the letter of S.