diff --git a/parts/3/notes.md b/parts/3/notes.md
index eebcc43..a765a7f 100644
--- a/parts/3/notes.md
+++ b/parts/3/notes.md
@@ -1,7 +1,7 @@
 Exercises:
 * [X] 3.1
 * [X] 3.2
-* [ ] 3.3
+* [X] 3.3
 * [ ] 3.4
 * [ ] 3.5
 * [ ] 3.6
diff --git a/parts/3/phonebookBackend/index.js b/parts/3/phonebookBackend/index.js
index e854f8f..f2167a0 100644
--- a/parts/3/phonebookBackend/index.js
+++ b/parts/3/phonebookBackend/index.js
@@ -30,10 +30,28 @@ app.get("/api/persons", (request, response) => {
   response.json(persons);
 });
 
+app.get("/api/persons/:id", (request, response) => {
+  const requestedId = Number(request.params.id);
+
+  const requestedPerson = persons.find(
+    (person) => Number(person.id) === requestedId
+  );
+
+  if (!requestedPerson) {
+    return response.status(404).json({
+      error: "ID not found.",
+    });
+  }
+
+  if (requestedPerson) {
+    return response.json(requestedPerson);
+  }
+});
+
 app.get("/info", (request, response) => {
   let responseString = `<p>Phonebook has info for ${persons.length} people</p>`;
   responseString += `<p>${new Date().toString()}</p>`;
-
+  const id = request.params.id;
   response.send(responseString);
 });
 
diff --git a/parts/3/phonebookBackend/requests/get_person.rest b/parts/3/phonebookBackend/requests/get_person.rest
new file mode 100644
index 0000000..519873d
--- /dev/null
+++ b/parts/3/phonebookBackend/requests/get_person.rest
@@ -0,0 +1 @@
+GET http://localhost:3001/api/persons/6
\ No newline at end of file