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JSON formatting in Apex

I am getting a JSON in below format:
{
"A":"1",
"B":"2"
}
I have a field update and JSON at some point could be too long.
How can I change the JSON format to below pattern?
{"A":"1","B":"2"}
I am trying to store this minified JSON format on a field, so that char limit issue is resolved.

deserialize the string and serialize it again and then update the field.
Declare the JSON as string
Map<String,Object> parser = (Map<String,Object>)JSON.deserializeUntyped(yourstring);
yourstring = JSON.serialize(parser);
You can change Map accordingly. Required format will be present in string variable.

Read not correct JSON

I have JSON as string
"{nameBitsCount=131}"
I need, using Jackson: 1) Parse this JSON correctly. 2) Put result into Map<String, Long>
But I Getting exception.
com.fasterxml.jackson.core.JsonParseException: Unexpected character ('n' (code 110)): was expecting double-quote to start field name
at [Source: (String)"{nameBitsCount=131}";
PS: I think I need to change style of JSON to this
"{\"nameBitsCount\":\"131\"}";

The JSON you send isn't valid
{nameBitsCount=131}
need to convert format :
{"nameBitsCount":131}
add {"} around the Key and change {=} to {:} the JSON format valid for Json Object :
{
"Key" : "Value"
// "VALUE" if use for String and char put {"} around the value VALUE ex: 0.0 , 1 , -50 , FALSE
}
Look this website :
JSON Website
JSON Syntax

Does Gson’s fromJSON have a parsing limit on the string parameter?

I’m using GSON to convert a JSON string stored in our DB to our corresponding object class.
String configData = dbCall.fetchPublishedData(dbURL); //returns JSON string
Gson gson = new Gson();
publishDataObject = gson.fromJson(configData, PublishedDataVO.class);
For the most part, this is working, except for one particular row in our DB that is failing with an exception from the GSON parser. All of our rows in the DB are created with the same tool and have the same data structure, the only difference for this one row is that it holds A LOT of data in its JSON string. When I try to retrieve this data and transform it into our class object, I am getting the following error:
com.google.gson.JsonSyntaxException: com.google.gson.stream.MalformedJsonException: Unterminated string at line 1 column 4001 path...
The size of the data string in this row is the only difference with the other row's strings. I even took the JSON string and formatted it to see if it is a valid JSON string, and it doesn't show errors. Does GSON have a limit on the input string size for its fromJSON method?

XML to JSON Convertor Using JSON Schema in Java

I'm trying to convert an xml to json data using the java-json.jar . The conversion is done. but have issues with the resulting JSON data like
An Integer is expected but the data is converted as String.
it would not create a list if there was only one child element ( even when it should be a list as per the JSON schema ).
Is there any way to convert XML into JSON based on the JSON schema in Java?

Searching a key which is period separated using Boon api

I'm using Boon api for parsing a json string. In my json string one of the key is separated with a period example-(com.stack.demo). Now, the problem is that boon considers this period and separates the key. In short I'm trying to lookup a string in xpath fashion. In xpath you have a delimeter '[]' in which we can place the period separated string and xpath (json path) searches the string correctly.
I want to achieve the same through boon, any ideas...refer to the code below -
Map<String, Object> rickJsonList1 = (Map<String, Object>) Boon.fromJson(input);
System.out.println(Boon.atIndex(rickJsonList1, "eventHeader.com.schema.Header"));
The json is as below -
{"eventHeader" : {"com.schema.Header": "test"}}
I need to get the value "test"...

Have you tried bracket-notation?
?['eventHeader']['com.schema.Header']