Retrofit 2.0 - How to Get Response Body for 400 Bad Request Error

Getting error code 400 bad request in retrofit but works on postman

The issue is with your locationPost type, it should be JsonObject and not JSONObject, so try one of the following approaches

Approach 1

Api Interface

Call<ResponseBody> registerUser(@Body JsonObject locationPost);

Api call

JsonObject obj = new JsonObject();
obj.addProperty("httpMethod","POST");
obj.addProperty("firstname",firstNameValue);

// add the rest of the field

Call<ResponseBody> call = apiInterface.registerUser(obj);

//rest of the logic remains same

Approach 2

create a POJO class representing the object and pass the instance of the object

public class RequestObject{

final String  httpMethod, firstname;
// declare member variables for all the keys

   RequestObject(String method,String firstname){
        this.httpMethod = method;
        this.firstname = firstname;
   }
}

API Interface

Call<ResponseBody> registerUser(@Body RequestObject locationPost);

Api call

RequestObject requestobject = new RequestObject("POST","firstName");
// add the rest of the field

Call<ResponseBody> call = apiInterface.registerUser(requestObject);

//rest of the logic remains same

Retrofit gets 400 Bad request but works with postman

1.Frist thing your api is a GET Method so use @GET instead @POST

Second try to change url base url in retrofit
.baseUrl("https://locodealapi.herokuapp.com")
to .baseUrl("https://locodealapi.herokuapp.com/")
this will work. or leave your problem in comment
2.this is sample code

HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
    interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
    OkHttpClient okHttpClient = new OkHttpClient.Builder().addInterceptor(
            new Interceptor() {
                @Override
                public Response intercept(Chain chain) throws IOException{
                 Request original = chain.request();
                    // Request customization: add request headers
                    Request.Builder requestBuilder =original.newBuilder().
                            method(original.method(), original.body());
                    Request request = requestBuilder.build();
                    return chain.proceed(request);
                }
            })
            .addInterceptor(interceptor).connectTimeout(60,TimeUnit.SECONDS).readTimeout(60, TimeUnit.SECONDS).build();

    Retrofit retrofit = new Retrofit.Builder().baseUrl("https://locodealapi.herokuapp.com/")
            .addConverterFactory(GsonConverterFactory.create())
            .client(okHttpClient).build();
    UserApi userApi = retrofit.create(UserApi.class);
    Call<ResponseBody> call = userApi.deals("your token");
    call.enqueue(new Callback<ResponseBody>() {
        @Override
        public void onResponse(Call<ResponseBody> call,retrofit2.Response<ResponseBody> response) {
        }
        @Override
        public void onFailure(Call<ResponseBody> call, Throwable t) {}
    });
}

@GET("api/deals")
Call deals(@Header("x-access-token") String x_access_token);

Android Retrofit 2: Random code 400 (bad request) response

So I fixed this my reinitializing OkHttpClient every ew request. Probably it has some old data in it. If anyone can elaborate on this, would be great.

Need to get the response message, while getting 400 error in Retrofit, Android

Try to use this to map your response to the format of the error supplied by the API:

public static ErrorDTO parseError(Retrofit retrofit, Response<?> response) {
    Converter<ResponseBody, ErrorDTO> converter = retrofit.responseBodyConverter(ErrorDTO.class, new Annotation[0]);

    ErrorDTO error;

    try {
        error = converter.convert(response.errorBody());
    } catch (IOException e) {
        return new ErrorDTO();
    }

    return error;
}

ErrorDTO should be a simple POJO which matches the structure of the body of the error response.

Retrofit POST method returns error 400

UPDATE: change field name in Tokken class from @SerializedName("tokken") into @SerializedName("token") as on attached screenshot from Postman in response you get "token" key but not "tokken".

Maybe it's not the root cause but one of the problem for sure:
you didn't configure your retrofit client properly, you missed to add http client:

retrofit = new Retrofit.Builder()
                .baseUrl(baseUrl)
                .client(clientBuilder.build())
                .addConverterFactory(GsonConverterFactory.create())
                .build();

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