Why I'm getting Flutter HTTP package error type 'String' is not a subtype of type 'Map<String, dynamic>'?

Question

I'm using the exact code example of Flutter's HTTP package with just different body contents, as in:

res = await http.post(
  Uri.parse("http://localhost:3000/login"),
  headers: <String, String>{
    'Content-Type': 'application/json; charset=UTF-8',
  },
  body: jsonEncode(<String, String>{
    'email': "[email protected]",
    "password": "testPassword",
  }),
);

Yet I'm getting the error type 'String' is not a subtype of type 'Map<String, dynamic>' for the body format. And I can't leave the body without encoding to be a Map<String, String> because this will fail the API.

What should I do?

Mudassir · Accepted Answer · 2021-10-24 00:40:53Z

1

jsonEncode outputs a String. You can just send a Map to your API.

answered Oct 24, 2021 at 0:40

Mudassir

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3 Comments

Lee Maan Over a year ago

The problem/point is that the docs of the HTTP package has an example that doesn't work out of the box. post method expects a Map while the code passes a String. This is aside, my backend doesn't accept a Map.

Mudassir Over a year ago

May I have a look at your API docs?

Lee Maan Over a year ago

I didn't write docs for it. Just a Golang API that expects JSON (works with Postman). However I solved it by adjusting the API to start accepting Maps.

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