How do I decode this response body?

Question

I have this response body from a http push

"{"identifier":"00000000-0000-0000-0000-00000000000"}"

I'd like to get the 000000... part as string

that's the relevant part of my code

.

.. async { 
    await http
          .post(Uri.encodeFull(mainURL + registrEndPoint + _stuff))
          .then((res) {
        if (res.statusCode == 202) {  
        Map _body = jsonDecode(res.body); 
                           // I checked debugging, the respons boy is ok
        String _id =_body['identifier'];
        return _id;
}...

I believe I'm missing something in the 'mapping'
and I suspect the combo 'quote-curlyBraces-quote' defeat my jsonDecode;

any suggestion?

thanks in advance

Solution 1

I solved the problem adding this line

String _body = res.body;

as described below,

await http
        .post(Uri.encodeFull(mainURL + registrEndPoint + _qr))
        .then((res) {
      if (res.statusCode == 202) {
        String _body = res.body;   //<--- HERE!
        Map _json = jsonDecode(_body);
        String _id = _json['identifier'];
        return _id ;
    });

Thank you all for the help!

Solution 2

By looking at the dart:convert documentation, you’ll see that jsonDecode() returns a Map<String, dynamic>, meaning that you do not know the types of the values until runtime.

Map<String, dynamic> body = jsonDecode(jsonString);
print('Howdy, ${body['identifier']}!');

Comments

[Günter Zöchbauer]

What do you get for String _id =_body['identifier'];?

[Francesco Iapicca]

appear to be null, when I debug it just skips the breakpoint

[Günter Zöchbauer]

Shouldn't be hard to investigate using the debugger what's actually in _body.

[Francesco Iapicca]

'hoovering' the mouse on it doesn't show anything, next step is skipped and the return is null

[Francesco Iapicca]

thank for the answer, but it seems exactly what I'm already doing [edit: i see the values returned in runtime while debugging, res body value is the one quote in the initial post, but _id is null]