erlang - How to Convert a list of tuples into a Json string -

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i have erlang list of tuples follows:

[  {{"a"},[2],[{3,"b"},{4,"c"}],[5,"d"],[1,1],{e},["f"]}  ,     {{"g"},[3],[{6,"h"},{7,"i"}],[{8,"j"}],[1,1,1],{k},["l"]}  ]

i wanted list of tuples in form:

<<" [  {{"a"},[2],[{3,"b"},{4,"c"}],[5,"d"],[1,1],{e},["f"]} ,         {{"g"},[3],[{6,"h"},{7,"i"}],[{8,"j"}],[1,1,1],{k},["l"]}] ">>

so tried using json parsing libraries in erlang (both jiffy , jsx ) here did:

a=[  {{"a"},[2],[{3,"b"},{4,"c"}],[5,"d"],[1,1],{e},["f"]}  ,         {{"g"},[3],[{6,"h"},{7,"i"}],[{8,"j"}],[1,1,1],{k},["l"]}  ],  b=erlang:iolist_to_binary(io_lib:write(a)),  jsx:encode(b).

and following output(here have changed list binary since jsx accepts binary):

 <<"[{{[97]},[2],[{3,[98]},{4,[99]}],[5,[100]],[1,1],{e},[[102]]},{{[103]},  [3],[{6,[104]},{7,[105]}],[{8,[106]}],[1,1,1],{k},[[76]]}]">>

jiffy:encode(b) gives same output. can me output :

<<" [  {{"a"},[2],[{3,"b"},{4,"c"}],[5,"d"],[1,1],{e},["f"]} ,             {{"g"},[3],[{6,"h"},{7,"i"}],[{8,"j"}],[1,1,1],{k},["l"]}] ">>

instead of 

<<"[{{[97]},[2],[{3,[98]},{4,[99]}],[5,[100]],[1,1],{e},[[102]]},{{[103]},      [3],[{6,[104]},{7,[105]}],[{8,[106]}],[1,1,1],{k},[[76]]}]">>

thank in advance

instead of io_lib:write(a), use io_lib:format("~p", [a]). tries guess lists meant strings. (in erlang, strings lists of integers. try it: "a" == [65])

> a=[  {{"a"},[2],[{3,"b"},{4,"c"}],[5,"d"],[1,1],{e},["f"]}  ,        {{"g"},[3],[{6,"h"},{7,"i"}],[{8,"j"}],[1,1,1],{k},["l"]}  ]. [{{"a"},[2],[{3,"b"},{4,"c"}],[5,"d"],[1,1],{e},["f"]},  {{"g"},[3],[{6,"h"},{7,"i"}],[{8,"j"}],[1,1,1],{k},["l"]}] > b = erlang:iolist_to_binary(io_lib:format("~p", [a])). <<"[{{\"a\"},[2],[{3,\"b\"},{4,\"c\"}],[5,\"d\"],[1,1],{e},[\"f\"]},\n {{\"g\"},[3],[{6,\"h\"},{7,\"i\"}],[{8,\"j\"}],[1,1,1],{k},[\"l\"]}]">>

if don't want see backslashes before double quotes, can print string standard output:

> io:format("~s\n", [b]). [{{"a"},[2],[{3,"b"},{4,"c"}],[5,"d"],[1,1],{e},["f"]},  {{"g"},[3],[{6,"h"},{7,"i"}],[{8,"j"}],[1,1,1],{k},["l"]}]




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