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Simon Hafner
Simon Hafner

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Decoding CBOR with PureScript

#cbor #purescript

If you want to decode cbor data from PureScript, there's cborg, which works just fine... if you use useMaps to deal with the Error: CBOR decode error: non-string keys not supported (got number) errors. Afterwards you have javascript Maps, which can't be decoded with argonaut. I use this code as workaround:

const toObject = function(cbor) { if (cbor instanceof Map) { var obj = {} cbor.forEach(function(value, key) { obj[key.toString()] = toObject(value); }); return obj; } else { if (cbor instanceof Array) { return cbor.map(ob => toObject(ob)); } else { if (cbor instanceof Object) { var obj = {} cbor.forEach(function(value, key) { obj[key.toString()] = toObject(value); }); return obj; } else { return cbor } } } }
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After that, you can decode the tags as string keys, e.g.

decodeJson cbor :: _ { "1" :: Int }
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