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How to parse escaped Json using JSONObject in android

I'm unable to parse escaped json string through JSONObject, while trying to parse it, I always get an Unterminated Object error. But when I manually remove all of the escape characters from the json string, JSONObject parses it successfully.
But the problem is that for complex or nested json strings, I don't want to remove escape characters, because for nested structures, unescaping the characters results in an invalid json string.
This is the json string after removing escapes characters and I get unterminated object error due to invalid json when parsing through JSONObject
{"result":"unknown","message":"{"firebase":"unknown"}","sender":"unknown"}
This is the unescaped json string
{"result":"unknown","message":"{\"firebase\":\"unknown\"}","sender":"unknown"}

If you look at the json you are constructing it in wrong format.
In case of escaped json
{
"result":"unknown",
"message":"{"firebase":"unknown"}",
"sender":"unknown"
}
the json object "message" is having value "{" and firebase is causing exception.
In the the escaped json "message":{"firebase":"unknown"} will form valid json.

Is this a valid JSON string?

i am not familiar with json but as far as i know this should be a valid JSON string
{text:" Klan: Fury Elo: 9004 ",color:gold,extra:[{text:">>[ INFO ]<<",clickEvent:{action:run_command,value:"/klan info Fury"},hoverEvent:{action:show_text,value:"Zobrazis informaci o klanu."},color:gray,bold:true},{text:" "},{text:">>[ JOIN ]<<",color:green,bold:true,clickEvent:{action:run_command,value:"/klan join Fury"},hoverEvent:{action:show_text,value:"Podas zadost o vstoupeni do klanu."}}]}
But i am getting this error
Use JsonReader.setLenient(true) to accept malformed JSON at line 1 column 3
Can somebody explain where is an error?

It is not. Keys must be strings.
Whenever in doubt check out JSONLint - a great resource for format validation.

Color and extra are not wrapped around double quote. For more information, read https://en.m.wikipedia.org/wiki/JSON

Escape "[" bracket from json

I know that "[" brackets are used in json to specify a list such as:
"Value":["A","B"]
However I want to use those brackets as is in json like "Value":"[A TO B]"
since in the future this json string gets mapped to a URL:
I am using java where while using json parser it gives me an error.
Is there a way I can escape "[" brackets.

As long as you keep it in quotes, it is valid JSON. Try the code below in a validator
{
"key": "mykey",
"Value": "[A TO B]"
}
It returns: valid!

new JSONObject() lead to ERROR if json starts with [] instead of {} in Java/windows 7?

Does Apache JSONObject() only support json that begin and end under curly braces? I'm getting the following error:
org.apache.commons.json.JSONException: Expecting '{' on line 1, column 2 instead, obtained token: 'Token: [
Any pointers?
Thanks!

If it starts with a square bracket then it's not a JSON object, it's a JSON array.

Reading Json String using Gson results error "not a JSON Array"

In my project i have a complex json response. I want to read it by GSon.
JSON : {'FoodMenuRS':{'Results':[{'Items':{'Item':[{'#Id':'24'},{'#Id':'24'}]}}, {'Items':{'Item':{'#Id':'24'}}}]}}
It contains a JSONArray with first "Item" and JSONObject with second one. Hence its call results in error,
failed to deserialize json object {"#Id":"24"} given the type java.util.List<com.servlet.action.ItemInfo> and java.lang.IllegalStateException: This is not a JSON Array.
Please help how i should handle this scenario. Thanks.

The string you are showing is a JSONObject not a JSONArray. So, in this case you first of all have to get the JSONObject and perform further decoding on that JSONObject.
JSONObject - {}
JSONArray - []
And indeed JSONObject or JSONArray should be encoded using Double-quotes(")

Your JSON is valid, but not for the doble quotes (") because JSON supports simple quotes (') and no quotes in the key name. See http://sites.google.com/site/gson/gson-user-guide#TOC-Serializing-and-Deserializing-Colle
However this JSON have key names that begin with #. For JSON strings this character is valid at the beginning of the name (see right column http://www.json.org/) but for Java this names are illegal (see Naming section http://download.oracle.com/javase/tutorial/java/nutsandbolts/variables.html). Specifically, names started with # are annotations and you can't use annotations tags to declare variables, fields, methods, etc.

This is not a valid JSON object. Strings in JSON are always encapsulated in double quotes ("). Contact the producer of that JSON and tell him to use a correct encoder.