diff --git a/.travis.yml b/.travis.yml
index ecd1cb6..95f517d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,8 @@ branches:
 
 install:
   - yarn
+  
+script:
   - yarn test
 
 cache:
diff --git a/README.md b/README.md
index 4aeebd1..9f5ea28 100644
--- a/README.md
+++ b/README.md
@@ -21,7 +21,7 @@ yarn add hera-js
 import { hera } from 'hera-js';
 
 const { data } = await hera({
-  option: {
+  options: {
     url: 'https://example.com'
   },
   query: `
@@ -43,7 +43,7 @@ const { data } = await hera({
 
 ```ts
 const { data } = await hera({
-  option: {
+  options: {
     url: 'https://example.com'
   },
   query: `
@@ -72,7 +72,7 @@ const { data } = await hera({
 
 ```ts
 const { data, errors } = await hera({
-  option: {
+  options: {
     url: 'https://example.com'
   },
   query: `
@@ -90,13 +90,45 @@ const { data, errors } = await hera({
 });
 ```
 
+**🌏 global options**
+
+> You can specify config defaults that will be applied to every request.
+
+```ts
+import { hera, globalOptions } from 'hera-js';
+
+globalOptions.url = 'https://example.com';
+
+const { data } = await hera({
+  query: `
+    mutation {
+      createUser(info: $info) {
+        id
+        name
+        age
+        address
+        job
+      }
+    }
+  `,
+  variables: {
+    info: {
+      name: 'Cuong Tran',
+      age: 22,
+      address: 'Sai Gon / Vietnam',
+      job: 'software engineer'
+    }
+  }
+});
+```
+
 ## 🚀 API
 
 ```ts
 hera({
-  option: Option;
   query: string;
   variables?: any;
+  options?: Options;
 }) : Promise<{ data: any; errors: any[] }>
 ```
 
diff --git a/__tests__/globalOptions.test.ts b/__tests__/globalOptions.test.ts
new file mode 100644
index 0000000..5127e8d
--- /dev/null
+++ b/__tests__/globalOptions.test.ts
@@ -0,0 +1,23 @@
+import { hera, globalOptions } from '../src';
+
+globalOptions.url = 'https://graphqlzero.almansi.me/api';
+
+test('hera test', async() => {
+  const { data } = await hera({
+    query: `
+      query {
+        post(id: $id) {
+          id
+          title
+          body
+        }
+      }
+    `,
+    variables: {
+      id: 1
+    }
+  });
+  expect(data.post.id).toEqual('1');
+  expect(typeof data.post.title).toEqual('string');
+  expect(typeof data.post.body).toEqual('string');
+});
\ No newline at end of file
diff --git a/__tests__/index.test.ts b/__tests__/index.test.ts
index 7196850..1b9f5d9 100644
--- a/__tests__/index.test.ts
+++ b/__tests__/index.test.ts
@@ -2,7 +2,7 @@ import { hera } from '../src';
 
 test('hera test', async() => {
   const { data } = await hera({
-    option: {
+    options: {
       url: 'https://graphqlzero.almansi.me/api'
     },
     query: `
diff --git a/package.json b/package.json
index 1fc53f7..13b7ea9 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@103cuong/hera-js",
-  "version": "0.3.1",
+  "version": "0.4.0",
   "description": "👩🏼‍💻 Simple and lightweight GraphQL client.",
   "main": "./lib/index.js",
   "types": "./lib/index.d.ts",
diff --git a/src/index.ts b/src/index.ts
index b71b6ae..cbddaf4 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-import axios, { AxiosResponse, AxiosRequestConfig } from 'axios';
+import axios from 'axios';
 
 function formatVariables(variables: any): any {
   let formattedVariables = JSON.stringify(variables);
@@ -14,29 +14,43 @@ function formatQuery(query: string, variables: any): string {
   return formattedQuery;
 }
 
-interface Option {
-  url: string;
-  headers?: AxiosRequestConfig['headers'];
+interface Options {
+  url?: string;
+  headers?: any;
 }
 
-const hera = ({
+
+const globalOptions: Options = {};
+
+const hera = async ({
   query,
   variables,
-  option,
+  options = globalOptions,
 }: {
   query: string;
   variables?: any;
-  option: Option;
-}): Promise<{ data: any; errors: any[] }> => axios.post(
-  option.url,
-  {
-    query: variables ? formatQuery(query, variables): query,
-  },
-  {
-    headers: option.headers,
-  },
-)
-  .then((res: AxiosResponse) => res.data)
-  .catch(error => ({ data: null, errors: [error] }));
+  options?: Options;
+}): Promise<{ data: any; errors: any[] }> => {
+  if (!options.url) {
+    return {
+      data: null,
+      errors: [new Error('options.url must be provided')],
+    };
+  }
+  try {
+    const res = await axios.post(
+      options.url,
+      {
+        query: variables ? formatQuery(query, variables) : query,
+      },
+      {
+        headers: options.headers,
+      },
+    );
+    return res.data;
+  } catch (error) {
+    return { data: null, errors: [error] };
+  }
+};
 
-export { hera };
+export { hera, globalOptions };