Post Data into API From flutter

Question

I have an API,which is written in Node.js .It is used for logging purpose.Now i'm using the same from a flutter application for performing the same Operation.

 API  :  http://192.168.137.1:5050/User/Login

How post data to the API from flutter application

Expected Input :
 { Data: { USER_NAME: 'usenmae', PASSWORD: 'password' } }

1.From Flutter

static Future<String> loginPost(String email, String password) async {
    Map<String, dynamic> jsonMap = {
      'Data': {'USER_NAME': email,'PASSWORD' : password}
    };
    try {
      final response = await http.post(
         'http://192.168.137.1:5050/User/Login',
        body: jsonMap,
      );
      return response.body;

    } catch (exception) {

    }
    return null;
  }

After calling the API by using the above code snippets i got some errors

Error : I/flutter ( 4149): send message exception called
I/flutter ( 4149): type '_InternalLinkedHashMap<String, String>' is not a subtype of type 'String' in type cast

I want pass the username and password through the api by wrapping the same with an another Data object,which look likes { Data: { USER_NAME: 'usenmae', PASSWORD: 'password' } }

Thanks

Zakir · Accepted Answer · 2020-04-12 16:52:52Z

1

Before passing data to http.post(), encode the jsonMap data using dart:convert.

import 'dart:convert' as convert;

  final response = await http.post(
    'http://192.168.137.1:5050/User/Login',
    body: convert.jsonEncode(jsonMap),
    headers: {"Content-type" : "application/json"}
  );

edited Apr 12, 2020 at 16:52

answered Apr 10, 2020 at 19:33

Zakir

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1 Comment

Sufail Kalathil Over a year ago

Tried passing data to API by encoding with jsonEncode.But passed data such as username and password not getting on the API.It return null while printing req.body on the API side in Node js. console.log(req.body); return null

omartinma · Accepted Answer · 2020-04-10 19:56:26Z

0

Just need to encoded as json as said before and also put this in your header 'Content-type': 'application/json'

answered Apr 10, 2020 at 19:56

omartinma

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