Get Non Indented string from Json Object

Question

I have a json object in c++. I am using json_cpp library.

I want to get the string from the Json::Value object. I am using it like below.

Json::Value obj;
....
....
....
string str = obj.toStyledString();

This returns the string in the pretty print format. But I want the string without any indentation. How can I do that as there are no other functions provided in the class?

JSON is a character string, normally transmitted without format information. Any representation as "obj" is not "JSON" but rather a translation of the JSON into the elements of some kit. — Hot Licks
– Hot Licks, Commented Sep 20, 2013 at 20:22
Hint: What operation created "obj"? Is there a reverse operation? — Hot Licks
– Hot Licks, Commented Sep 20, 2013 at 20:32
I suppose that toStyledString() is actually a reverse operation :) But it returnes a formatted JSON string while the topic starter wants an unformatted. — FreeNickname
– FreeNickname, Commented Sep 20, 2013 at 21:02
@FreeNickname - I was trying to prompt the OP to actually look at the documentation. — Hot Licks
– Hot Licks, Commented Sep 20, 2013 at 21:36

FakeTruth · Accepted Answer · 2013-09-20 21:33:53Z

3

You could use Json::FastWriter it does not have any indentation and formatting since it outputs everything on a single line. it is normally not suitable for 'human' consumption.

std::string toUnStyledString(const Json::Value& value)
{
   Json::FastWriter writer;
   return writer.write( value );
}

The function toStyledString also simply uses a Json::StyledWriter if you look into the definition of Json::Value::toStyledString.

answered Sep 20, 2013 at 21:33

FakeTruth

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Comments

FreeNickname · Accepted Answer · 2013-09-20 21:04:53Z

0

Well, if this library doesn't provide appropriate methods then you could write them yourself. The JSON format is rather simple, so I don't think that it will take a lot of work. Here you can find a good graphical representation of JSON format:

http://json.org

P.S. I've never worked with this particular library, so I propose sort of a general solution.

UPDATE: another option is to get a string returned by toStyledString() and remove indentation. But it requires string processing and will probably be resource consuming. Note that you can't just remove tabs/spaces/new line symbols, because they can be a part of JSON object. Why do you want unindented string again?

edited Sep 20, 2013 at 21:04

answered Sep 20, 2013 at 20:18

FreeNickname

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