diff --git a/.gitignore b/.gitignore
index d7e107a..31c3260 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,3 +23,4 @@ dist-ssr
 *.njsproj
 *.sln
 *.sw?
+*.env
diff --git a/package-lock.json b/package-lock.json
index 2124ce7..5298436 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,6 +13,7 @@
         "@sveltejs/vite-plugin-svelte": "^2.0.2",
         "@tsconfig/svelte": "^3.0.0",
         "@types/marked": "^4.0.8",
+        "@types/node": "^18.15.3",
         "bulma": "^0.9.4",
         "bulma-prefers-dark": "^0.1.0-beta.1",
         "copy-to-clipboard": "^3.3.3",
@@ -652,6 +653,12 @@
       "integrity": "sha512-HVNzMT5QlWCOdeuBsgXP8EZzKUf0+AXzN+sLmjvaB3ZlLqO+e4u0uXrdw9ub69wBKFs+c6/pA4r9sy6cCDvImw==",
       "dev": true
     },
+    "node_modules/@types/node": {
+      "version": "18.15.3",
+      "resolved": "https://mirrors.cloud.tencent.com/npm/@types/node/-/node-18.15.3.tgz",
+      "integrity": "sha512-p6ua9zBxz5otCmbpb5D3U4B5Nanw6Pk3PPyX05xnxbB/fRv71N7CPmORg7uAD5P70T0xmx1pzAx/FUfa5X+3cw==",
+      "dev": true
+    },
     "node_modules/@types/pug": {
       "version": "2.0.6",
       "resolved": "https://registry.npmjs.org/@types/pug/-/pug-2.0.6.tgz",
diff --git a/package.json b/package.json
index 5c44355..1dd9e7f 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
     "@sveltejs/vite-plugin-svelte": "^2.0.2",
     "@tsconfig/svelte": "^3.0.0",
     "@types/marked": "^4.0.8",
+    "@types/node": "^18.15.3",
     "bulma": "^0.9.4",
     "bulma-prefers-dark": "^0.1.0-beta.1",
     "copy-to-clipboard": "^3.3.3",
diff --git a/src/lib/Chat.svelte b/src/lib/Chat.svelte
index fc0313c..1633c4d 100644
--- a/src/lib/Chat.svelte
+++ b/src/lib/Chat.svelte
@@ -144,7 +144,7 @@
     // Send API request
     /*
     // Not working yet: a way to get the response as a stream
-    await fetchEventSource("https://api.openai.com/v1/chat/completions", {
+    await fetchEventSource(import.meta.env.VITE_API_BASE + "/v1/chat/completions", {
       method: "POST",
       headers: {
         Authorization:
@@ -185,7 +185,7 @@
         }, {})
       }
       response = await (
-        await fetch('https://api.openai.com/v1/chat/completions', {
+        await fetch(import.meta.env.VITE_API_BASE + '/v1/chat/completions', {
           method: 'POST',
           headers: {
             Authorization: `Bearer ${$apiKeyStorage}`,
@@ -275,7 +275,7 @@
 
     // Load available models from OpenAI
     const allModels = (await (
-      await fetch('https://api.openai.com/v1/models', {
+      await fetch(import.meta.env.VITE_API_BASE + '/v1/models', {
         method: 'GET',
         headers: {
           Authorization: `Bearer ${$apiKeyStorage}`,
diff --git a/vite.config.ts b/vite.config.ts
index 3290cdd..50d70f9 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -1,10 +1,14 @@
-import { defineConfig } from 'vite'
+import { defineConfig, loadEnv } from 'vite'
 import { svelte } from '@sveltejs/vite-plugin-svelte'
 
 import purgecss from '@fullhuman/postcss-purgecss'
 
 // https://vitejs.dev/config/
 export default defineConfig(({ command, mode, ssrBuild }) => {
+  // Load env file based on `mode` in the current working directory.
+  const env = loadEnv(mode, process.cwd())
+  // Set default api base url
+  env.VITE_API_BASE = 'https://api.openai.com'
   // Only run PurgeCSS in production builds
   if (command === 'build') {
     return {