I've seen some threads about problems parsing JSON strings (esp. lists/maps) due to special chars (e.g. when a value contains a Base64 string). I now had one app which sends JSON strings (a list with n maps) via network. In some cases I had problems parsing the strings due to "invalid chars or delimiters).
The reason was that I've added maps directly to a list and then converted the list to a JSON string. Somehow this doesn't work when you send the data via network (AsyncStreams or Http) when you don't url encode the data.
Output: [{"key":"value"},{"key":"value"}] -> problematic
To solve this issue I convert the maps to a JSON string BEFORE I add them to the list. This seems to escape chars which can interfere.
Output: ["{\"key\":\"value\"}","{\"key\":\"value\"}"] -> good
The reason was that I've added maps directly to a list and then converted the list to a JSON string. Somehow this doesn't work when you send the data via network (AsyncStreams or Http) when you don't url encode the data.
B4X:
Dim l As List
l.Initialize
Dim m1 As Map = CreateMap("key":"value")
Dim m2 As Map = CreateMap("key":"value")
'adding maps to the list
l.Add(m1) 'add the map to the list
l.Add(m2)
JG.Initialize2(l)
Dim JSONString As String = JG.ToString
Log(JSONString)Output: [{"key":"value"},{"key":"value"}] -> problematic
To solve this issue I convert the maps to a JSON string BEFORE I add them to the list. This seems to escape chars which can interfere.
B4X:
'Better: Adding maps which were converted to JSON-Strings before
l.Clear
JG.Initialize(m1)
l.Add(JG.ToString)
JG.Initialize(m2)
l.Add(JG.ToString)
JG.Initialize2(l)
JSONString=JG.ToString
Log(JSONString)Output: ["{\"key\":\"value\"}","{\"key\":\"value\"}"] -> good