Flutter is not returning an api call - json

Question

So I am trying to parse some json with http my method of parsing in this
Future<bool> fetchUser(username) async {
setLoading(true);
await Osu(username).fetchUser().then((data) {
setLoading(false);
if (data.statusCode == 200) {
setUser(UserInfo.fromJson(json.decode(data.body)));
} else {
print(data.body);
Map<String, dynamic> result = json.decode(data.body);
setMessage(result['message']);
}
});
return isUser();
}
class UserInfo {
String userId;
String username;
DateTime joinDate;
String count300;
String count100;
String count50;
String playcount;
String rankedScore;
String totalScore;
String ppRank;
String level;
String ppRaw;
String accuracy;
String countRankSs;
String countRankSsh;
String countRankS;
String countRankSh;
String countRankA;
String country;
String totalSecondsPlayed;
String ppCountryRank;
List<dynamic> events;
UserInfo({
this.userId,
this.username,
this.joinDate,
this.count300,
this.count100,
this.count50,
this.playcount,
this.rankedScore,
this.totalScore,
this.ppRank,
this.level,
this.ppRaw,
this.accuracy,
this.countRankSs,
this.countRankSsh,
this.countRankS,
this.countRankSh,
this.countRankA,
this.country,
this.totalSecondsPlayed,
this.ppCountryRank,
this.events,
});
Map toJson() => {
"user_id": userId == null ? null : userId,
"username": username == null ? null : username,
"join_date": joinDate == null ? null : joinDate.toIso8601String(),
"count300": count300 == null ? null : count300,
"count100": count100 == null ? null : count100,
"count50": count50 == null ? null : count50,
"playcount": playcount == null ? null : playcount,
"ranked_score": rankedScore == null ? null : rankedScore,
"total_score": totalScore == null ? null : totalScore,
"pp_rank": ppRank == null ? null : ppRank,
"level": level == null ? null : level,
"pp_raw": ppRaw == null ? null : ppRaw,
"accuracy": accuracy == null ? null : accuracy,
"count_rank_ss": countRankSs == null ? null : countRankSs,
"count_rank_ssh": countRankSsh == null ? null : countRankSsh,
"count_rank_s": countRankS == null ? null : countRankS,
"count_rank_sh": countRankSh == null ? null : countRankSh,
"count_rank_a": countRankA == null ? null : countRankA,
"country": country == null ? null : country,
"total_seconds_played":
totalSecondsPlayed == null ? null : totalSecondsPlayed,
"pp_country_rank": ppCountryRank == null ? null : ppCountryRank,
"events":
events == null ? null : List<dynamic>.from(events.map((x) => x)),
};
UserInfo.fromJson(Map json)
: userId = json["user_id"] == null ? null : json["user_id"],
username = json["username"] == null ? null : json["username"],
joinDate = json["join_date"] == null
? null
: DateTime.parse(json["join_date"]),
count300 = json["count300"] == null ? null : json["count300"],
count100 = json["count100"] == null ? null : json["count100"],
count50 = json["count50"] == null ? null : json["count50"],
playcount = json["playcount"] == null ? null : json["playcount"],
rankedScore =
json["ranked_score"] == null ? null : json["ranked_score"],
totalScore = json["total_score"] == null ? null : json["total_score"],
ppRank = json["pp_rank"] == null ? null : json["pp_rank"],
level = json["level"] == null ? null : json["level"],
ppRaw = json["pp_raw"] == null ? null : json["pp_raw"],
accuracy = json["accuracy"] == null ? null : json["accuracy"],
countRankSs =
json["count_rank_ss"] == null ? null : json["count_rank_ss"],
countRankSsh =
json["count_rank_ssh"] == null ? null : json["count_rank_ssh"],
countRankS = json["count_rank_s"] == null ? null : json["count_rank_s"],
countRankSh =
json["count_rank_sh"] == null ? null : json["count_rank_sh"],
countRankA = json["count_rank_a"] == null ? null : json["count_rank_a"],
country = json["country"] == null ? null : json["country"],
totalSecondsPlayed = json["total_seconds_played"] == null
? null
: json["total_seconds_played"],
ppCountryRank =
json["pp_country_rank"] == null ? null : json["pp_country_rank"],
events = json["events"] == null
? null
: List<dynamic>.from(json["events"].map((x) => x));
}
And then this is my request call:
import 'package:http/http.dart' as http;
class Osu {
final String userName;
final String url = 'https://osu.ppy.sh/api';
static String apiKey = 'wewewewewwweojjfoejfe';
Osu(this.userName);
Future<http.Response> fetchUser() {
return http.get(url + '/get_user' + "?u=$userName" + "&k=$apiKey");
}
}
I have tried returning it in a list but i just get the same error and advice?
The error I get is:
TypeError (type 'List' is not a subtype of type 'Map')
on line
await Osu(username).fetchUser().then((data) {
Thank you!
I am not sure if it is not mapping correctly or that I am messing up the call itself. Either way I have been extremely stumped on this for the past 30m and can't seem to solve it.
Updated with json:
[
{
"user_id": "9795284",
"username": "SakuraMotion",
"join_date": "2017-02-24 17:41:13",
"count300": "4155343",
"count100": "655286",
"count50": "64939",
"playcount": "25758",
"ranked_score": "8433289241",
"total_score": "20762480956",
"pp_rank": "84925",
"level": "99.3314",
"pp_raw": "3318.78",
"accuracy": "95.20140075683594",
"count_rank_ss": "5",
"count_rank_ssh": "0",
"count_rank_s": "473",
"count_rank_sh": "1",
"count_rank_a": "942",
"country": "US",
"total_seconds_played": "1467366",
"pp_country_rank": "14317",
"events": []
}
updated with data.body response:
[
{
"user_id": "9795284",
"username": "SakuraMotion",
"join_date": "2017-02-24 17:41:13",
"count300": "4185533",
"count100": "658232",
"count50": "65063",
"playcount": "26008",
"ranked_score": "8509686083",
"total_score": "20977676803",
"pp_rank": "84295",
"level": "99.3547",
"pp_raw": "3333.68",
"accuracy": "95.1374740600586",
"count_rank_ss": "5",
"count_rank_ssh": "0",
"count_rank_s": "477",
"count_rank_sh": "1",
"count_rank_a": "950",
"country": "US",
"total_seconds_played": "1475942",
"pp_country_rank": "14224",
"events": [
{
"display_html": "<img src='/images/C_small.png'/> <b><a href='/u/9795284'>SakuraMotion</a></b> achieved rank #842 on <a href='/b/1771455?m=3'>Cranky vs. MASAKI - ouroboros -twin stroke of the end- [4K CS' Normal]</a> (osu!mania)",
"beatmap_id": "1771455",
"beatmapset_id": "845135",
"date": "2019-10-19 01:24:15",
"epicfactor": "1"
},
{
"display_html": "<img src='/images/B_small.png'/> <b><a href='/u/9795284'>SakuraMotion</a></b> achieved rank #812 on <a href='/b/2115037?m=0'>Kousaka Honoka (CV: Nitta Emi) - Snow halation (HONOKA Mix) [Devotion]</a> (osu!)",
"beatmap_id": "2115037",
"beatmapset_id": "982344",
"date": "2019-10-19 01:08:44",
"epicfactor": "1"
},
{
"display_html": "<img src='/images/B_small.png'/> <b><a href='/u/9795284'>SakuraMotion</a></b> achieved rank #377 on <a href='/b/2173646?m=0'>Roselia - Charles [Expert]</a> (osu!)",
"beatmap_id": "2173646",
"beatmapset_id": "1032239",
"date": "2019-10-19 01:05:46",
"epicfactor": "1"
},
{
"display_html": "<img src='/images/B_small.png'/> <b><a href='/u/9795284'>SakuraMotion</a></b> achieved rank #70 on <a href='/b/2123647?m=0'>Reol - Jitter Doll [Extra]</a> (osu!)",
"beatmap_id": "2123647",
"beatmapset_id": "1010993",
"date": "2019-10-19 01:02:50",
"epicfactor": "1"
}
]
}
]

Answer 1

Pay attention to the error as it is clearly stating your issue: type 'List<dynamic>' is not a subtype of type 'Map, not sure if it is actually on fetch but
Find documentation for https://osu.ppy.sh/api/get_user API and confirm response. You can also test command line by doing:
curl -X GET https://osu.ppy.sh/api/get_user&u=USERNAME&k=KEY
and ensure you are getting 200 and correct structure.

Answer 2

I think the error is on this line
Map<String, dynamic> result = json.decode(data.body);
The result of the json.decode(data.body) is actually a List but you assigned it to Map
I think you can change it to
List<Dynamic> result = json.decode(data.body);
or
List result = json.decode(data.body);
If you really need to Map it, you can Map it later from the List

Answer 3

There is a multitude of reasons that you might be getting the error... it would be beneficial to provide a sample of the JSON that the API is returning.
You can check your UserInfo()... it has the following field:
List<dynamic> events;
Double check if the events coming from the JSON is really a List.
If you are having an issue with parsing complex JSON files... better use JsonSerializable https://flutter.dev/docs/development/data-and-backend/json#creating-model-classes-the-json_serializable-way