Le'Json - Lightweight Erlang Json library

Requires R17 since it produces maps on decode. Not yet handling unicode code points like "\uD8B3" (arabic) correctly. Other than that it seem to keep with the standard (rfc4627). Encoding is also compatible with rfc8259.

Exports

-type json_key()    :: atom() | string() | binary().
-type json_value()  :: boolean() | 'null' | calendar:datetime() | atom()
                     | number() | binary() | json_object() | json_array().
-type json_object() :: #{json_key() => json_value()}.
-type json_array()  :: [json_value()].
-type json_opts()   :: #{'keys' => 'atom' | 'existing_atom' | 'list'}.

-spec lejson:decode(iodata()) -> json_object() | json_array() | {error, not_json}.
-spec lejson:decode(iodata(), json_opts()) ->
                    json_object() | json_array() | {error, not_json}.

-spec lejson:encode(json_value()) -> binary().

Example usage

1> l(lejson).
ok
2> M = lejson:decode(<<"{\"boolean\": [true, false],
                         \"neg_num\": -12,
                         \"floats\": [-22.3, -22.3e-12, 22.3E-12,
                                      22.3E+4, 22.3E+4, 22.3E4],
                         \"null\": null,
                         \"pos_int\": 6789,
                         \"string_value\": \"value\",
                         \"utf_value\": \"\\uC3B8 and \\uc2a9\",
                         \"arabic\": \"\\uD8B3\\ud8b5\\ud8b8\",
                         \"more unicode\": \" \\uD834 \\uDD1E \",
                         \"array\": [{\"object_inside_array\": 1}],
                         \"nested_array\": [[[79]]],
                         \"another_array\": [1,2,3,[1,[2],3],12]}">>).
#{<<"another_array">> => [1,2,3,[1,[2],3],12],
  <<"arabic">> => <<216,179,216,181,216,184>>,
  <<"array">> => [#{<<"object_inside_array">> => 1}],
  <<"boolean">> => [true,false],
  <<"floats">> => [-22.3,-2.23e-11,2.23e-11,2.23e5,2.23e5,2.23e5],
  <<"more unicode">> => <<32,216,52,32,221,30,32>>,
  <<"neg_num">> => -12,
  <<"nested_array">> => [["O"]],
  <<"null">> => null,
  <<"pos_int">> => 6789,
  <<"string_value">> => <<"value">>,
  <<"utf_value">> => <<"ø and ©"/utf8>>}
3> lejson:encode(M)
<<"{\"another_array\": [1, 2, 3, [1, [2], 3], 12],\"arabic\": \""...>>

License

Apache license version 2.0. See the LICENSE file for details.