source: binary-improvements2/7dtd-server-fixes/src/JSON/JSONObject.cs@ 401

using System.Collections.Generic;
using System.Text;

namespace AllocsFixes.JSON {
        public class JsonObject : JsonNode {
                private readonly Dictionary<string, JsonNode> nodes = new Dictionary<string, JsonNode> ();

                public JsonNode this [string _name] {
                        get => nodes [_name];
                        set => nodes [_name] = value;
                }

                public int Count => nodes.Count;

                public List<string> Keys => new List<string> (nodes.Keys);

                public bool ContainsKey (string _name) {
                        return nodes.ContainsKey (_name);
                }

                public bool TryGetValue (string _name, out JsonNode _node) {
                        return nodes.TryGetValue (_name, out _node);
                }

                public void Add (string _name, JsonNode _node) {
                        nodes.Add (_name, _node);
                }

                public override void ToString (StringBuilder _stringBuilder, bool _prettyPrint = false, int _currentLevel = 0) {
                        _stringBuilder.Append ("{");
                        if (_prettyPrint) {
                                _stringBuilder.Append ('\n');
                        }

                        foreach ((string key, JsonNode value) in nodes) {
                                if (_prettyPrint) {
                                        _stringBuilder.Append (new string ('\t', _currentLevel + 1));
                                }

                                _stringBuilder.Append ($"\"{key}\":");
                                if (_prettyPrint) {
                                        _stringBuilder.Append (" ");
                                }

                                value.ToString (_stringBuilder, _prettyPrint, _currentLevel + 1);
                                _stringBuilder.Append (",");
                                if (_prettyPrint) {
                                        _stringBuilder.Append ('\n');
                                }
                        }

                        if (nodes.Count > 0) {
                                _stringBuilder.Remove (_stringBuilder.Length - (_prettyPrint ? 2 : 1), 1);
                        }

                        if (_prettyPrint) {
                                _stringBuilder.Append (new string ('\t', _currentLevel));
                        }

                        _stringBuilder.Append ("}");
                }

                public static JsonObject Parse (string _json, ref int _offset) {
                        //Log.Out ("ParseObject enter (" + offset + ")");
                        JsonObject obj = new JsonObject ();

                        bool nextElemAllowed = true;
                        _offset++;
                        while (true) {
                                Parser.SkipWhitespace (_json, ref _offset);
                                switch (_json [_offset]) {
                                        case '"':
                                                if (nextElemAllowed) {
                                                        JsonString key = JsonString.Parse (_json, ref _offset);
                                                        Parser.SkipWhitespace (_json, ref _offset);
                                                        if (_json [_offset] != ':') {
                                                                throw new MalformedJsonException (
                                                                        "Could not parse object, missing colon (\":\") after key");
                                                        }

                                                        _offset++;
                                                        JsonNode val = Parser.ParseInternal (_json, ref _offset);
                                                        obj.Add (key.GetString (), val);
                                                        nextElemAllowed = false;
                                                } else {
                                                        throw new MalformedJsonException (
                                                                "Could not parse object, found new key without a separating comma");
                                                }

                                                break;
                                        case ',':
                                                if (!nextElemAllowed) {
                                                        nextElemAllowed = true;
                                                        _offset++;
                                                } else {
                                                        throw new MalformedJsonException (
                                                                "Could not parse object, found a comma without a key/value pair first");
                                                }

                                                break;
                                        case '}':
                                                _offset++;

                                                //Log.Out ("JSON:Parsed Object: " + obj.ToString ());
                                                return obj;
                                }
                        }
                }
        }
}