docs: constraining number of properties in objects

content/03-Objects/03-Constraining-Number-of-Properties/code.ts

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+const code: any = {
+  type: "object",
+  properties: {
+    name: {
+      type: "string",
+    },
+    age: {
+      type: "integer",
+    },
+    contactMethods: {
+      type: "object",
+    },
+  },
+};
+
+const solution = structuredClone(code);
+solution.properties.contactMethods = {
+  additionalProperties: {
+    type: "string",
+  },
+  minProperties: 2,
+  maxProperties: 5,
+};
+
+const testCases = [
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      contactMethods: {
+        email: "[email protected]",
+        phone: "1234567890",
+        phone2: "1234567890",
+      },
+    },
+    expected: true,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      contactMethods: {
+        email: "[email protected]",
+        phone: "1234567890",
+      },
+    },
+    expected: true,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      contactMethods: {},
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      contactMethods: {
+        email: "[email protected]",
+      },
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      contactMethods: {
+        email: "[email protected]",
+        phone: "1234567890",
+        phone2: "1234567890",
+        email2: "[email protected]",
+      },
+    },
+    expected: true,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      contactMethods: {
+        email: 0,
+        phone: null,
+      },
+    },
+    expected: false,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      contactMethods: {
+        email: "[email protected]",
+        phone: "1234567890",
+        phone2: "1234567890",
+        email2: "[email protected]",
+        phone3: "1234567890",
+      },
+    },
+    expected: true,
+  },
+  {
+    input: {
+      name: "John Doe",
+      age: 30,
+      contactMethods: {
+        email: "[email protected]",
+        phone: "1234567890",
+        phone2: "1234567890",
+        email2: "[email protected]",
+        phone3: "1234567890",
+        fax: "1234567890",
+      },
+    },
+    expected: false,
+  },
+];
+
+module.exports = {
+  code,
+  solution,
+  testCases,
+};

content/03-Objects/03-Constraining-Number-of-Properties/instructions.mdx

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+---
+title: Constraining Number of Properties
+description: Learn how to set the minimum and maximum number of properties in an object in JSON Schema.
+keywords: minProperties, maxProperties, object, JSON Schema, properties, type, properties, required, properties, object
+---
+
+
+# Constraining Number of Properties
+
+In JSON Schema, you can set constraints on the number of properties an object can have using the `minProperties` and `maxProperties` keywords.
+
+- `minProperties` specifies the **minimum number of properties an object must have.**
+- `maxProperties` specifies the **maximum number of properties an object can have.**
+
+Let's add a new property `contactMethods` in the employee object and set constraints on the number of properties.
+
+```json highlightLineStart={4}  highlightLineEnd={7}
+{
+  "name": "John Doe",
+  "age": 25,
+  "contactMethods": {
+    "email": "[email protected]",
+    "phone": "1234567890",
+    "mobile": "0987654321"
+  }
+}
+```
+
+Now, add the `minProperties` and `maxProperties` keywords to the schema on the right side editor to set the minimum and maximum number of properties in the `contactMethods` object.
+
+In the `contactMethods` object, set the minimum number of properties to `2` and the maximum number of properties to `5`. 
+
+
+**Example**
+
+```json
+{
+  "type": "object",
+  "minProperties": 2,
+  "maxProperties": 5
+}
+```
+
+Additionally, in the `contactMethods` object, use the `additionalProperties` keyword to ensure that the values of the properties are `string` type.