diff --git a/dashcaddy-api/__tests__/input-validator.test.js b/dashcaddy-api/__tests__/input-validator.test.js
index 48f3af6..309748c 100644
--- a/dashcaddy-api/__tests__/input-validator.test.js
+++ b/dashcaddy-api/__tests__/input-validator.test.js
@@ -14,6 +14,9 @@ const {
 } = require('../input-validator');
 
 describe('Input Validator', () => {
+  function fail(message) {
+    throw new Error(message);
+  }
 
   describe('ValidationError', () => {
     it('has correct name, message, field, and statusCode', () => {
diff --git a/dashcaddy-api/__tests__/routes/health.routes.test.js b/dashcaddy-api/__tests__/routes/health.routes.test.js
index ecd6521..558e381 100644
--- a/dashcaddy-api/__tests__/routes/health.routes.test.js
+++ b/dashcaddy-api/__tests__/routes/health.routes.test.js
@@ -524,9 +524,7 @@ describe('Health Routes', () => {
     it('returns error when no url parameter provided', async () => {
       const { app } = createApp();
       const res = await request(app).get('/api/health/probe');
-      // ValidationError is not imported at module scope, so this throws a ReferenceError
-      // which the error handler catches as a 500
-      expect(res.status).toBe(500);
+      expect(res.status).toBe(400);
     });
   });
 
diff --git a/dashcaddy-api/routes/apps/compose.js b/dashcaddy-api/routes/apps/compose.js
index 128439b..9473bf7 100644
--- a/dashcaddy-api/routes/apps/compose.js
+++ b/dashcaddy-api/routes/apps/compose.js
@@ -256,7 +256,9 @@ module.exports = function({ docker, caddy, servicesStateManager, portLockManager
           const existing = docker.client.getContainer(containerName);
           await existing.remove({ force: true });
           await new Promise(r => setTimeout(r, 1000));
-        } catch (_) {}
+        } catch (_) {
+          // No stale container to remove
+        }
 
         const container = await docker.client.createContainer(containerConfig);
         await container.start();
diff --git a/dashcaddy-api/routes/exec.js b/dashcaddy-api/routes/exec.js
index 983478c..1a3e69a 100644
--- a/dashcaddy-api/routes/exec.js
+++ b/dashcaddy-api/routes/exec.js
@@ -55,7 +55,9 @@ async function handleExec(ws, containerId, log) {
       if (chunks.length > 0 && Buffer.concat(chunks).toString().includes('/bash')) {
         shell = '/bin/bash';
       }
-    } catch (_) {}
+    } catch (_) {
+      // Fall back to /bin/sh when bash detection fails
+    }
 
     execInstance = await container.exec({
       Cmd: [shell],
@@ -96,21 +98,27 @@ async function handleExec(ws, containerId, log) {
             return;
           }
         }
-      } catch (_) {}
+      } catch (_) {
+        // Treat message as raw terminal input if JSON parsing fails
+      }
       // Regular terminal input
       execStream.write(data);
     });
 
     ws.on('close', () => {
       if (execStream) {
-        try { execStream.destroy(); } catch (_) {}
+        try { execStream.destroy(); } catch (_) {
+          // Ignore stream teardown errors on socket close
+        }
       }
     });
 
     ws.on('error', (err) => {
       log.warn('exec', 'WebSocket error', { containerId, error: err.message });
       if (execStream) {
-        try { execStream.destroy(); } catch (_) {}
+        try { execStream.destroy(); } catch (_) {
+          // Ignore stream teardown errors after websocket errors
+        }
       }
     });
 
diff --git a/dashcaddy-api/routes/services.js b/dashcaddy-api/routes/services.js
index 314f7ef..726214d 100644
--- a/dashcaddy-api/routes/services.js
+++ b/dashcaddy-api/routes/services.js
@@ -8,10 +8,9 @@ const { APP, REGEX, TIMEOUTS } = require('../constants');
 const { validateServiceConfig, isValidPort } = require('../input-validator');
 const { exists } = require('../fs-helpers');
 const { paginate, parsePaginationParams } = require('../pagination');
-const { ValidationError, NotFoundError } = require('../errors');
+const { ValidationError, NotFoundError, ConflictError } = require('../errors');
 const { resolveServiceUrl } = require('../url-resolver');
 const { success, error: errorResponse } = require('../response-helpers');
-const { ConflictError, ValidationError, NotFoundError } = require('../errors');
 
 /**
  * Services route factory