diff --git a/src/shared/validators/setting.js b/src/shared/validators/setting.js
index 0b853a8..caba5cc 100644
--- a/src/shared/validators/setting.js
+++ b/src/shared/validators/setting.js
@@ -23,11 +23,39 @@ const validateKeymaps = (keymaps) => {
   }
 };
 
+const validateSearch = (search) => {
+  let engines = search.engines;
+  for (let key of Object.keys(engines)) {
+    if (/\s/.test(key)) {
+      throw new Error(
+        `While space in search engine name is not allowed: "${key}"`
+      );
+    }
+    let url = engines[key];
+    if (!url.match(/{}/)) {
+      throw new Error(`No {}-placeholders in URL of "${key}"`);
+    }
+    if (url.match(/{}/g).length > 1) {
+      throw new Error(`Multiple {}-placeholders in URL of "${key}"`);
+    }
+  }
+
+  if (!search.default) {
+    throw new Error(`Default engine is not set`);
+  }
+  if (!Object.keys(engines).includes(search.default)) {
+    throw new Error(`Default engine "${search.default}" not found`);
+  }
+};
+
 const validate = (settings) => {
   validateInvalidTopKeys(settings);
   if (settings.keymaps) {
     validateKeymaps(settings.keymaps);
   }
+  if (settings.search) {
+    validateSearch(settings.search);
+  }
 };
 
 export { validate };
diff --git a/test/shared/validators/setting.test.js b/test/shared/validators/setting.test.js
index 8bf0cbe..9baf858 100644
--- a/test/shared/validators/setting.test.js
+++ b/test/shared/validators/setting.test.js
@@ -22,4 +22,61 @@ describe("setting validator", () => {
       expect(fn).to.throw(Error, 'poison.dressing');
     });
   });
+
+  describe("search settings", () => {
+    it('throws an error for invalid search engine name', () => {
+      let settings = {
+        search: {
+          default: 'google',
+          engines: {
+            'google': 'https://google.com/search?q={}',
+            'cherry pie': 'https://cherypie.com/search?q={}',
+          }
+        }
+      };
+      let fn = validate.bind(undefined, settings)
+      expect(fn).to.throw(Error, 'cherry pie');
+    });
+
+    it('throws an error for no {}-placeholder', () => {
+      let settings = {
+        search: {
+          default: 'google',
+          engines: {
+            'google': 'https://google.com/search?q={}',
+            'yahoo': 'https://search.yahoo.com/search',
+          }
+        }
+      };
+      let fn = validate.bind(undefined, settings)
+      expect(fn).to.throw(Error, 'yahoo');
+    });
+
+    it('throws an error for no default engines', () => {
+      let settings = {
+        search: {
+          engines: {
+            'google': 'https://google.com/search?q={}',
+            'yahoo': 'https://search.yahoo.com/search?q={}',
+          }
+        }
+      };
+      let fn = validate.bind(undefined, settings)
+      expect(fn).to.throw(Error, 'Default engine');
+    });
+
+    it('throws an error for invalid default engine', () => {
+      let settings = {
+        search: {
+          default: 'twitter',
+          engines: {
+            'google': 'https://google.com/search?q={}',
+            'yahoo': 'https://search.yahoo.com/search?q={}',
+          }
+        }
+      };
+      let fn = validate.bind(undefined, settings)
+      expect(fn).to.throw(Error, 'twitter');
+    });
+  });
 });