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Your question is bigger than the answers received so far. However, for Manipulating JSON, they have all told you about <code>mochijson.erl</code> , <code>mochijson2.erl</code> all of which come with <code>mochiweb</code> HTTP Library. To use them, a JSON Object is represented as a <code>Struct</code> Object like this: <pre> In JSON {"FirstName": "Joshua", "Surname": "Muzaaya"} In Erlang {struct,[{<<"FirstName">>,<<"Joshua">>},{<<"Surname">>,<<"Muzaaya">>}]} </pre> To Parse to and Fro: <pre> JSON_DATA = {"students":[ {"student_number":45, "details":[{"FirstName": "Joshua", "Surname": "Muzaaya"} ] } ]} From JSON to Erlang $> mochijson2:decode(JSON_DATA). {struct,[{<<"students">>, [{struct,[{<<"student_number">>,45}, {<<"details">>, [{struct,[{<<"FirstName">>,<<"Joshua">>}, {<<"Surname">>,<<"Muzaaya">>}]}]}]}]}]} From Erlang to JSON $> mochijson2:encode(StructObject). </pre> Now Databases, i dont know what you really want, but, normally, we can write data in a Key Value store , <code>Mnesia</code> , or <code>CouchDB</code> via a <code>RESTFUL</code> access API. I have written a <code>Couchbase Single Server</code> Client in Erlang. Here are some of the functions inside: <pre> create_database(ServerDomain,DBName)-> try ibrowse:send_req(ServerDomain ++ DBName,[{"Content-Type", "application/json"}],put,[]) of {ok,_,_,Result} -> case proplists:get_value(<<"ok">>,element(2,mochijson2:decode(Result ))) of undefined -> {error,failed}; _ -> ok end; Any -> {error,Any} catch EE:EE2 -> {error,{EE,EE2}} end. delete_database(ServerDomain,DBName)-> try ibrowse:send_req(ServerDomain ++ DBName,[{"Content-Type","application/json"}],delete,[]) of {ok,_,_,Result} -> case proplists:get_value(<<"ok">>,element(2,mochijson2:decode(Result))) of undefined -> {error,failed}; _ -> ok end; Any -> {error,Any} catch EE:EE2 -> {error,{EE,EE2}} end. %% read/3 ::= Struct read(ServerDomain,DBName,DocId)-> try ibrowse:send_req(ServerDomain ++ DBName ++ "/" ++ DocId,[{"Content-Type","application/json"}],get,[]) of {ok,_,_,Result} -> mochijson2:decode(Result); Any -> {error,Any} catch EE:EE2 -> {error,{EE,EE2}} end. %% write/3 ::= [{id,Id::string()},{rev,Rev::string()}] write(ServerDomain,DBName,DocStruct)-> try ibrowse:send_req(ServerDomain ++ DBName,[{"Content-Type","application/json"}],post,lists:flatten(mochijson:encode(DocStruct))) of {ok,_,_,Result} -> E = element(2,mochijson2:decode(Result)), case {proplists:get_value(<<"id">>,E),proplists:get_value(<<"rev">>,E)} of {undefined,_} -> {error,E}; {_,undefined} -> {error,E}; {Id,Rev} -> [{id,binary_to_list(Id)},{rev,binary_to_list(Rev)}] end; Any -> {error,Any} catch EE:EE2 -> {error,{EE,EE2}} end. %% remember to specify the '_rev' of recent copy when updating %% update/4 ::= [{id,Id::string()},{rev,Rev::string()}] update(ServerDomain,DBName,DocId,DocStruct)-> try ibrowse:send_req(ServerDomain ++ DBName ++ "/" ++ DocId,[{"Content-Type","application/json"}],put,lists:flatten(mochijson:encode(DocStruct))) of {ok,_,_,Result} -> E = element(2,mochijson2:decode(Result)), case {proplists:get_value(<<"id">>,E),proplists:get_value(<<"rev">>,E)} of {undefined,_} -> {error,E}; {_,undefined} -> {error,E}; {Id,Rev} -> [{id,binary_to_list(Id)},{rev,binary_to_list(Rev)}] end; Any -> {error,Any} catch EE:EE2 -> {error,{EE,EE2}} end. %% you need to provide the '_rev' of current copy %% of doc to be deleted delete(ServerDomain,DBName,DocId,Rev)-> try ibrowse:send_req(ServerDomain ++ DBName ++ "/" ++ DocId ++ "?rev=" ++ Rev,[{"Content-Type","application/json"}],delete,[]) of {ok,_,_,Result} -> E = element(2,mochijson2:decode(Result)), case {proplists:get_value(<<"id">>,E),proplists:get_value(<<"ok">>,E)} of {undefined,_} -> {error,E}; {_,undefined} -> {error,E}; {_Id,_} -> ok end; Any -> {error,Any} catch EE:EE2 -> {error,{EE,EE2}} end. random(ServerDomain,Count) when is_integer(Count)-> try ibrowse:send_req(ServerDomain ++ "_uuids?count=" ++ integer_to_list(Count),[{"Content-Type","application/json"}],get,[]) of {ok,_,_,Result} -> [binary_to_list(Z) || Z <- proplists:get_value(<<"uuids">>,element(2,mochijson2:decode(Result)))]; Any -> {error,Any} catch EE:EE2 -> {error,{EE,EE2}} end. </pre> So, perhaps try breaking down your question. Otherwise, you can see above that i am playing alot with JSON. To use the methods abpve, first make user <code>ibrowse</code> is running. 
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