diff --git a/src/main/java/sg/com/smartinventory/controllers/CustomerController.java b/src/main/java/sg/com/smartinventory/controllers/CustomerController.java
index 9339dc7..19ed27c 100644
--- a/src/main/java/sg/com/smartinventory/controllers/CustomerController.java
+++ b/src/main/java/sg/com/smartinventory/controllers/CustomerController.java
@@ -1,6 +1,10 @@
 package sg.com.smartinventory.controllers;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.springframework.http.HttpStatus;
+import org.springframework.http.HttpStatusCode;
 import org.springframework.http.ResponseEntity;
 // import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
@@ -14,6 +18,12 @@
 // import sg.com.smartinventory.entities.Review;
 import sg.com.smartinventory.services.CustomerService;
 
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.PutMapping;
+
 @RestController
 @RequestMapping("/customers")
 public class CustomerController {
@@ -35,6 +45,35 @@ public ResponseEntity<Customer> createCustomer(@Valid @RequestBody Customer cust
         return new ResponseEntity<>(newCustomer, HttpStatus.CREATED);
     }
 
+    // READ (all)
+    @GetMapping("")
+    public ResponseEntity<ArrayList<Customer>> getAllCustomers() {
+        ArrayList<Customer> allCustomers = customerService.getAllCustomers();
+        return new ResponseEntity<>(allCustomers, HttpStatus.OK);
+    }
+
+    // READ (id)
+    @GetMapping("/{id}")
+    public ResponseEntity<Customer> getCustomer(@PathVariable long id) {
+        Customer foundCustomer = customerService.getCustomer(id);
+        return new ResponseEntity<>(foundCustomer, HttpStatus.OK);
+    }
+
+    // UPDATE
+    @PutMapping("/{id}")
+    public ResponseEntity<Customer> updateCustomer(@PathVariable long id, @RequestBody Customer customer) {
+        // TODO: process PUT request
+        Customer updatedCustomer = customerService.updateCustomer(id, customer);
+        return new ResponseEntity<>(updatedCustomer, HttpStatus.OK);
+    }
+
+    // DELETE
+    @DeleteMapping("/{id}")
+    public ResponseEntity<HttpStatus> deleteCustomer(@PathVariable long id) {
+        customerService.deleteCustomer(id);
+        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
+    }
+
     // // Nested route - Add review to customer.
     // @PostMapping("/{id}/reviews")
     // public ResponseEntity<Review> addReviewToCustomer(@PathVariable Long id,