Update index.md

json/index.md

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 ## Table of Contents
+- [Naming](#naming)
+- [JSON Style Rules](#json-style-rules)
+- [JSON Formatting Rules](#json-formatting-rules)
+
+### Naming
+
+### Key Names
+Use **camelCase** for key names to maintain consistency across different programming languages.
+
+```json
+{
+  "firstName": "Pelagornis",
+  "lastName": "INC"
+}
+```
+
+Consistency: Ensure that you use the same naming convention consistently across the project. For example, if you use camelCase in one file, use it in all other files as well.
+
+#### Number Values
+Numbers that should be treated as strings (e.g., phone numbers, card numbers) should be stored as string values.
+
+```json
+{
+  "phoneNumber": "123-456-7890"
+}
+```
+
+#### Boolean Values
+Store boolean values as true or false. Avoid using `1`, `0`, `yes`, or `no`, as these are not valid in JSON.
+
+```json
+{
+  "isActive": true
+}
+```
+
+#### Null Values
+Use `null` for missing or undefined values. It’s better to use null than an empty string ("") or other placeholder values.
+```json
+{
+  "middleName": null
+}
+```
+
+### JSON Style Rules
+
+#### Indentation
+Use **2 spaces** for indentation to ensure a clean and readable hierarchy.
+
+```json
+{
+  "name": "Alice",
+  "age": 30,
+  "address": {
+    "street": "123 Main St",
+    "city": "Wonderland"
+  }
+}
+```
+
+#### Whitespace
+Always add a space between **keys and values** for readability.
+Add a space after a **comma** to improve clarity.
+
+```json
+{
+  "lang": "ko",
+  "city": "Korea" 
+}
+```
+
+#### Trailing Comma
+Do not add a comma after the last item in an object or array. JSON does not allow trailing commas and some parsers may fail.
+```json
+{
+  "name": "Pelagornis",
+  "city": "Korea"
+}
+```
+
+#### Sorting Keys
+**Sort object keys alphabetically** for consistency and easier navigation in larger JSON files.
+
+```json
+{
+  "name": "ZEPA"
+  "type": "AI"
+}
+```
+
+### JSON Formatting Rules
+
+#### Arrays
+When working with arrays, each item should be placed on a new line, and each line should be indented properly.
+
+```json
+{
+  "fruits": [
+    "apple",
+    "banana",
+    "cherry"
+  ]
+}
+```
+
+#### Nested Objects
+When nesting objects within objects, ensure that each nested object is indented to clearly reflect its structure.
+
+```json
+{
+  "name": "Pelagornis",
+  "address": {
+    "city": "Korea"
+  }
+}
+```
+#### String Formatting
+Strings should always be enclosed in double quotes ("). Single quotes (') are not valid in JSON.
+```json
+{
+  "quote": "He said, \"Hello!\""
+}
+```
+#### File Encoding
+JSON files must be saved with `UTF-8` encoding to ensure proper character rendering and compatibility.
+
+#### Comments
+JSON does not support comments. Do not include comments within JSON files. If comments are necessary, maintain them in a separate documentation file.