diff --git a/packages/emitter/src/emitter.ts b/packages/emitter/src/emitter.ts
index 54c04e5..78d74bc 100644
--- a/packages/emitter/src/emitter.ts
+++ b/packages/emitter/src/emitter.ts
@@ -300,6 +300,7 @@ export class TyplexEmitter {
       ? getDoc(this.program, model)
       : undefined;
     const required: string[] = [];
+    const nullable: string[] = [];
     const properties: any = {};
 
     for (const [name, prop] of model.properties) {
@@ -307,7 +308,28 @@ export class TyplexEmitter {
         required.push(name);
       }
 
-      const propDef = this.typeToLexiconDefinition(prop.type, prop);
+      // Check if property type is a union with null
+      let typeToProcess = prop.type;
+      if (prop.type.kind === "Union") {
+        const unionType = prop.type as Union;
+        const variants = Array.from(unionType.variants.values());
+
+        // Check if null is one of the variants
+        const hasNull = variants.some(v => v.type.kind === "Intrinsic" && (v.type as any).name === "null");
+
+        if (hasNull) {
+          // Mark this property as nullable
+          nullable.push(name);
+
+          // Find the non-null variant
+          const nonNullVariant = variants.find(v => !(v.type.kind === "Intrinsic" && (v.type as any).name === "null"));
+          if (nonNullVariant) {
+            typeToProcess = nonNullVariant.type;
+          }
+        }
+      }
+
+      const propDef = this.typeToLexiconDefinition(typeToProcess, prop);
       if (propDef) {
         properties[name] = propDef;
       }
@@ -326,6 +348,10 @@ export class TyplexEmitter {
       obj.required = required;
     }
 
+    if (nullable.length > 0) {
+      obj.nullable = nullable;
+    }
+
     obj.properties = properties;
 
     return obj;
diff --git a/packages/example/.gitignore b/packages/example/.gitignore
index 6cd8161..c451bf6 100644
--- a/packages/example/.gitignore
+++ b/packages/example/.gitignore
@@ -2,7 +2,7 @@
 node_modules/
 
 # Generated lexicons
-lexicons/
+lexicon/
 
 # TypeSpec output (if using default config)
 tsp-output/
diff --git a/packages/example/lexicon/app/example/defs.json b/packages/example/lexicon/app/example/defs.json
deleted file mode 100644
index 0bf39cb..0000000
--- a/packages/example/lexicon/app/example/defs.json
+++ /dev/null
@@ -1,72 +0,0 @@
-{
-  "lexicon": 1,
-  "id": "app.example.defs",
-  "defs": {
-    "postRef": {
-      "type": "object",
-      "description": "Reference to a post",
-      "required": [
-        "uri",
-        "cid"
-      ],
-      "properties": {
-        "uri": {
-          "type": "string",
-          "description": "AT URI of the post"
-        },
-        "cid": {
-          "type": "string",
-          "description": "CID of the post"
-        }
-      }
-    },
-    "replyRef": {
-      "type": "object",
-      "description": "Reference to a parent post in a reply chain",
-      "required": [
-        "root",
-        "parent"
-      ],
-      "properties": {
-        "root": {
-          "type": "ref",
-          "ref": "#postRef",
-          "description": "Root post in the thread"
-        },
-        "parent": {
-          "type": "ref",
-          "ref": "#postRef",
-          "description": "Direct parent post being replied to"
-        }
-      }
-    },
-    "entity": {
-      "type": "object",
-      "description": "Text entity (mention, link, or tag)",
-      "required": [
-        "start",
-        "end",
-        "type",
-        "value"
-      ],
-      "properties": {
-        "start": {
-          "type": "integer",
-          "description": "Start index in text"
-        },
-        "end": {
-          "type": "integer",
-          "description": "End index in text"
-        },
-        "type": {
-          "type": "string",
-          "description": "Entity type"
-        },
-        "value": {
-          "type": "string",
-          "description": "Entity value (handle, URL, or tag)"
-        }
-      }
-    }
-  }
-}
diff --git a/packages/example/lexicon/app/example/follow.json b/packages/example/lexicon/app/example/follow.json
deleted file mode 100644
index 5390841..0000000
--- a/packages/example/lexicon/app/example/follow.json
+++ /dev/null
@@ -1,25 +0,0 @@
-{
-  "lexicon": 1,
-  "id": "app.example.follow",
-  "defs": {
-    "main": {
-      "type": "object",
-      "required": [
-        "subject",
-        "createdAt"
-      ],
-      "properties": {
-        "subject": {
-          "type": "string",
-          "description": "DID of the account being followed"
-        },
-        "createdAt": {
-          "type": "string",
-          "format": "datetime",
-          "description": "When the follow was created"
-        }
-      }
-    }
-  },
-  "description": "A follow relationship"
-}
diff --git a/packages/example/lexicon/app/example/like.json b/packages/example/lexicon/app/example/like.json
deleted file mode 100644
index 77739ac..0000000
--- a/packages/example/lexicon/app/example/like.json
+++ /dev/null
@@ -1,26 +0,0 @@
-{
-  "lexicon": 1,
-  "id": "app.example.like",
-  "defs": {
-    "main": {
-      "type": "object",
-      "required": [
-        "subject",
-        "createdAt"
-      ],
-      "properties": {
-        "subject": {
-          "type": "ref",
-          "ref": "app.example.defs#postRef",
-          "description": "Post being liked"
-        },
-        "createdAt": {
-          "type": "string",
-          "format": "datetime",
-          "description": "When the like was created"
-        }
-      }
-    }
-  },
-  "description": "A like on a post"
-}
diff --git a/packages/example/lexicon/app/example/post.json b/packages/example/lexicon/app/example/post.json
deleted file mode 100644
index e96feff..0000000
--- a/packages/example/lexicon/app/example/post.json
+++ /dev/null
@@ -1,45 +0,0 @@
-{
-  "lexicon": 1,
-  "id": "app.example.post",
-  "defs": {
-    "main": {
-      "type": "object",
-      "required": [
-        "text",
-        "createdAt"
-      ],
-      "properties": {
-        "text": {
-          "type": "string",
-          "description": "Post text content"
-        },
-        "createdAt": {
-          "type": "string",
-          "format": "datetime",
-          "description": "Creation timestamp"
-        },
-        "langs": {
-          "type": "array",
-          "items": {
-            "type": "string"
-          },
-          "description": "Languages the post is written in"
-        },
-        "entities": {
-          "type": "array",
-          "items": {
-            "type": "ref",
-            "ref": "app.example.defs#entity"
-          },
-          "description": "Referenced entities in the post"
-        },
-        "reply": {
-          "type": "ref",
-          "ref": "app.example.defs#replyRef",
-          "description": "Post the user is replying to"
-        }
-      }
-    }
-  },
-  "description": "A post in the feed"
-}
diff --git a/packages/example/lexicon/app/example/profile.json b/packages/example/lexicon/app/example/profile.json
deleted file mode 100644
index bd2d5d9..0000000
--- a/packages/example/lexicon/app/example/profile.json
+++ /dev/null
@@ -1,28 +0,0 @@
-{
-  "lexicon": 1,
-  "id": "app.example.profile",
-  "defs": {
-    "main": {
-      "type": "object",
-      "properties": {
-        "displayName": {
-          "type": "string",
-          "description": "Display name"
-        },
-        "description": {
-          "type": "string",
-          "description": "Profile description"
-        },
-        "avatar": {
-          "type": "string",
-          "description": "Profile avatar image"
-        },
-        "banner": {
-          "type": "string",
-          "description": "Profile banner image"
-        }
-      }
-    }
-  },
-  "description": "User profile information"
-}
diff --git a/packages/example/lexicon/app/example/repost.json b/packages/example/lexicon/app/example/repost.json
deleted file mode 100644
index 5ca59b1..0000000
--- a/packages/example/lexicon/app/example/repost.json
+++ /dev/null
@@ -1,26 +0,0 @@
-{
-  "lexicon": 1,
-  "id": "app.example.repost",
-  "defs": {
-    "main": {
-      "type": "object",
-      "required": [
-        "subject",
-        "createdAt"
-      ],
-      "properties": {
-        "subject": {
-          "type": "ref",
-          "ref": "app.example.defs#postRef",
-          "description": "Post being reposted"
-        },
-        "createdAt": {
-          "type": "string",
-          "format": "datetime",
-          "description": "When the repost was created"
-        }
-      }
-    }
-  },
-  "description": "A repost of another post"
-}