Edit Question - KnowledgeHub

Title Body

I am pretty new to Erlang, and I am trying to get a basic try / catch statement to work. I am using webmachine to process some requests and all I really want to do is parse some JSON data and return it. In the event that the JSON data is invalid, I just want to return an error msg. Here is the code I have so far. Note that the JSON data is invalid. to_text(ReqData, Context) -> Body = "{\"firstName\": \"John\"\"lastName\": \"Smith\"}", try decode(Body) of _ -> {"Success! Json decoded!",ReqData,Context} catch _ -> {"Error! Json is invalid",ReqData,Context} end. decode(Body) -> {struct, MJ} = mochijson:decode(Body). The code compiles, but when I run it, and send a request for the text, I get the following error back. error,{error,{case_clause,{{const,"lastName"}, ": \"Smith\"}", {decoder,utf8,null,1,31,comma}}}, [{mochijson,decode_object,3}, {mochijson,json_decode,2}, {webmachine_demo_resource,test,1}, {webmachine_demo_resource,to_text,2}, {webmachine_demo_resource,to_html,2}, {webmachine_resource,resource_call,3}, {webmachine_resource,do,3}, {webmachine_decision_core,resource_call,1}]}} What exactly am I doing wrong? The documentation says the "catch" statement handles all errors, or do I have to do something to catch a specific error that is thrown by mochijson:decode . Please any leads or advice would be helpful.

Tags (comma-separated) Cancel