diff --git a/README.md b/README.md
index eaa8880..b71e9cf 100644
--- a/README.md
+++ b/README.md
@@ -81,6 +81,8 @@ php artisan vendor:publish --provider=CodeTech\\ApiLogs\\Providers\\ApiLogServic
 
 Then adjust `config/api-logs.php`. `keys` are matched case-insensitively and recursively against the request payload, query string and response data; `headers` are matched against request header names.
 
+Key redaction applies to JSON responses only. A response that is not JSON, such as an HTML error page, is stored as its raw body, unredacted.
+
 ## Testing
 
 ```
diff --git a/src/Http/Middleware/LogApiRequest.php b/src/Http/Middleware/LogApiRequest.php
index b60a4b4..bf53584 100644
--- a/src/Http/Middleware/LogApiRequest.php
+++ b/src/Http/Middleware/LogApiRequest.php
@@ -42,9 +42,6 @@ public function terminate(Request $request, $response): void
             ?? $request->server('REQUEST_TIME_FLOAT')
             ?? microtime(true);
 
-        $content = $response->getContent();
-        $responseData = is_string($content) ? json_decode($content, true) : null;
-
         $keys = config('api-logs.redact.keys', []);
         $headers = config('api-logs.redact.headers', []);
         $replacement = config('api-logs.redact.replacement', '[REDACTED]');
@@ -58,7 +55,33 @@ public function terminate(Request $request, $response): void
             'ip' => $request->getClientIp(),
             'request_data' => Redactor::redact($request->all(), $keys, $replacement),
             'request_headers' => Redactor::redactHeaders($request->headers->all(), $headers, $replacement),
-            'response_data' => is_array($responseData) ? Redactor::redact($responseData, $keys, $replacement) : $responseData,
+            'response_data' => $this->responseData($response, $keys, $replacement),
         ]);
     }
+
+    /**
+     * Get the response body to store: the decoded JSON value when the body
+     * is JSON, or the raw body as a UTF-8 string otherwise.
+     *
+     * @param  \Symfony\Component\HttpFoundation\Response  $response
+     * @param  array  $keys
+     * @param  string  $replacement
+     * @return mixed
+     */
+    private function responseData($response, array $keys, string $replacement)
+    {
+        $content = $response->getContent();
+
+        if (! is_string($content)) {
+            return '';
+        }
+
+        $decoded = json_decode($content, true);
+
+        if (is_array($decoded)) {
+            return Redactor::redact($decoded, $keys, $replacement);
+        }
+
+        return $decoded ?? mb_scrub($content, 'UTF-8');
+    }
 }
diff --git a/tests/Feature/LogApiRequestMiddlewareTest.php b/tests/Feature/LogApiRequestMiddlewareTest.php
index 9cab874..260c22c 100644
--- a/tests/Feature/LogApiRequestMiddlewareTest.php
+++ b/tests/Feature/LogApiRequestMiddlewareTest.php
@@ -100,6 +100,45 @@ public function test_user_without_the_trait_is_skipped(): void
         $this->assertSame(0, ApiLog::count());
     }
 
+    public function test_html_response_is_logged_with_its_raw_body(): void
+    {
+        $this->actingAs($this->createUser())
+            ->get('/api/forbidden', ['Accept' => '*/*'])
+            ->assertForbidden();
+
+        $log = ApiLog::first();
+
+        $this->assertIsString($log->response_data);
+        $this->assertStringContainsString('<html', $log->response_data);
+    }
+
+    public function test_empty_response_is_logged_with_an_empty_body(): void
+    {
+        $this->actingAs($this->createUser())
+            ->delete('/api/items')
+            ->assertNoContent();
+
+        $this->assertSame('', ApiLog::first()->response_data);
+    }
+
+    public function test_streamed_response_is_logged_with_an_empty_body(): void
+    {
+        $this->actingAs($this->createUser())
+            ->get('/api/export')
+            ->assertOk();
+
+        $this->assertSame('', ApiLog::first()->response_data);
+    }
+
+    public function test_response_that_is_not_valid_utf8_is_logged_with_its_body_scrubbed(): void
+    {
+        $this->actingAs($this->createUser())
+            ->get('/api/binary')
+            ->assertOk();
+
+        $this->assertSame('abc?', ApiLog::first()->response_data);
+    }
+
     private function createUser(): User
     {
         return User::create([
diff --git a/tests/TestCase.php b/tests/TestCase.php
index 97aad34..e9c1369 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -68,6 +68,24 @@ private function defineTestRoutes()
                     'access_token' => 'issued-token',
                 ]);
             });
+
+            Route::get('/api/forbidden', function () {
+                abort(403);
+            });
+
+            Route::delete('/api/items', function () {
+                return response()->noContent();
+            });
+
+            Route::get('/api/export', function () {
+                return response()->stream(function () {
+                    echo 'a,b,c';
+                });
+            });
+
+            Route::get('/api/binary', function () {
+                return response("abc\xff");
+            });
         });
     }
 }