将 Erlang 元组编码为 JSON

Question

How do I convert a list with Tuples & Atoms & Binary strings in a list into JSON? I see Erlang : Tuple List into JSON and I found https://github.com/rustyio/BERT-JS

I want an API I can call like

erlang_json:convert([{a, b, {{c, d}}, 1}, {"a", "b", {{cat, dog}}, 2}

where the atoms would be converted to strings or some other standard way to process on the Javascript side.

I have complicated Erlang lists I need to send to my webpage.

Answer 1

It's unclear what [{a, b, {{c, d}}, 1}, {"a", "b", {{cat, dog}}, 2}... would turn into as JSON, but you might take a look at jiffy or jsx . Both of them work on simple key/value structures. For instance:

> Term = #{a => b, c => 1, <<"x">> => <<"y">>}.
#{a => b,c => 1,<<"x">> => <<"y">>}

> jiffy:encode(Term).
<<"{\"x\":\"y\",\"c\":1,\"a\":\"b\"}">>

> jsx:encode(Term).
<<"{\"a\":\"b\",\"c\":1,\"x\":\"y\"}">>

If you can say what JSON you want your example input to turn into, I might be able to give you a better suggestion.

Answer 2

Just for you https://github.com/romanr321/t2j

You don't need to wrap it in a list though, it takes one tuple argument and returnes a json formated string.

>Tuple = {{key, value}, { key2, {key3, [value1, 2,3]}}}.
>t2j:t2jp(Tuple).
{"key":"value", "key2, {"key3":["value1", 2,3]}}

Answer 3

The library jsone is pretty good. It can translate between maps or tuples: https://github.com/sile/jsone

I've used it extensively and it's lightning fast.

The only problem I've found is that a map that contains a list of maps throws an error. I hope this is fixed, but maybe I'm the only tart trying to do that.