Json To Tree Build

Author: PrashantUnity

content/application/httpclient/jsontotree.md

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+---
+title: "Json to C sharp class"
+author: "PrashantUnity"
+weight: 110
+date: 2025-01-01
+lastmod: 2025-01-01
+dateString: January 2025  
+description: "Just a hack for json parsing to JsonDocument to Tree"
+#canonicalURL: "https://canonical.url/to/page"
+cover:
+    image: "cover.jpg" # image path/url
+    alt: "Download Logo" # alt text
+    #caption: "Optical Character Recognition"  display caption under cover 
+
+tags: [ "NET", "codefrydev", "C sharp", "CFD","JSON"]
+keywords: [ "NET", "codefrydev", "C sharp", "CFD","JSON"]
+---
+
+
+# Suppose you have json text which changes it's name each time ? but depth level remains same, What would you do ?
+
+## Here is one way you can solve it 😁.
+
+> Since json can have name and Several children so we can create Tree like node
+
+```cs
+public class JsonNode
+{
+    public string Name {get;set;}
+    public List<JsonNode> Child {get;set;} = [];
+}
+```
+
+> Below code generate tree using Recursion
+
+
+```cs
+using System;
+using System.Collections.Generic;
+using System.Text.Json;
+
+public static JsonNode BuildTree(JsonElement element, string nodeName)
+{
+    var node = new JsonNode { Name = nodeName };
+
+    if (element.ValueKind == JsonValueKind.Object)
+    {
+        foreach (var property in element.EnumerateObject())
+        {
+            node.Child.Add(BuildTree(property.Value, property.Name));
+        }
+    }
+    else if (element.ValueKind == JsonValueKind.Array)
+    {
+        int index = 0;
+        foreach (var item in element.EnumerateArray())
+        {
+            node.Child.Add(BuildTree(item, $"[{index}]") );
+            index++;
+        }
+    }
+    else
+    {
+        node.Child.Add(new JsonNode { Name = element.ToString() });
+    }
+
+    return node;
+}
+```
+
+> Here we we have sample code to initialize/ use the above code
+```cs
+string jsonString = @"
+        {
+            ""12345"": {
+                ""name"": ""Test Business"",
+                ""policies"": {
+                    ""checkin"": ""12:00 PM"",
+                    ""checkout"": ""10:00 AM"",
+                    ""cancellation"": {
+                        ""before"": ""24 hours"",
+                        ""fee"": ""10%""
+                    }
+                }
+            }
+        }";
+JsonDocument doc = JsonDocument.Parse(jsonString);
+JsonElement rootElement = doc.RootElement;
+JsonNode rootNode = BuildTree(rootElement, "Root"); 
+
+var parent = rootNode.Child[0];
+```
+
+> Example
+
+![Image](./example.png)