Save the data in the file as json data

Question

Hello,
I need to read data from list / Pictures gallery / Documents  and save the returned data  in the file as json data .
How Can I Implement that .
ASk

Answer 1

Try below:
http://msdn.microsoft.com/en-us/library/office/jj164022%28v=office.15%29.aspx
The code in the following example shows you how to request a JSON representation of all of the lists in a site by using C#. It assumes that you have an OAuth access token that you are storing in the
accessToken variable.
C#
HttpWebRequest endpointRequest = (HttpWebRequest)HttpWebRequest.Create(sharepointUrl.ToString() + "/_api/web/lists");
endpointRequest.Method = "GET";
endpointRequest.Accept = "application/json;odata=verbose";
endpointRequest.Headers.Add("Authorization", "Bearer " + accessToken);
HttpWebResponse endpointResponse = (HttpWebResponse)endpointRequest.GetResponse();
Getting properties that aren't returned with the resource
Many property values are returned when you retrieve a resource, but for some properties, you have to send a
GET request directly to the property endpoint. This is typical of properties that represent SharePoint entities.
The following example shows how to get a property by appending the property name to the resource endpoint. The example gets the value of the
Author property from a File resource.
  http://<site url>/_api/web/getfilebyserverrelativeurl('/<folder name>/<file name>')/author
To get the results in JSON format, include an Accept header set to
"application/json;odata=verbose".
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