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Dart: convert map to JSON with all specified elements

I serialize the form to Dart in JSON and then submit it to the Spring MVC backend, using Jackson to deserialize JSON.

In the dart, if I print JSON, I get:

{firstName: piet, lastName: venter}

Jackson does not like the data in this format, he returns the status of 400 and The request sent by the client was syntactically incorrect.

If I put quotation marks in all fields, Jackson accepts the data and I get a response.

{"firstName": "piet", "lastName": "venter"}

In dart, I build a Map<String, String> data = {};, then go through all the fields of the form anddata.putIfAbsent(input.name, () => input.value);

Now, when I call data.toString(), I get unspecified JSON, which I assume is invalid JSON.

If I import 'dart:convert' show JSON;try JSON.encode(data).toString();, I get the same unordered JSON.

Double quotes are added manually:

data.putIfAbsent("\"" + input.name + "\"", () => "\"" + input.value + "\"");

On the Java side, there is no rocket:

@Controller
@RequestMapping("/seller")
@JsonIgnoreProperties(ignoreUnknown = true)
public class SellerController {

    @ResponseBody
    @RequestMapping(value = "/create", method = RequestMethod.POST, headers = {"Content-Type=application/json"})
    public Seller createSeller(@RequestBody Seller sellerRequest){

, , Dart JSON ( ), ? Jackson JSON?

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import 'dart:convert'; json.encode(data) (json.encode(data) Dart 1) JSON ( toString()

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