Clerk environment variables
You can use environment variables to configure how your Clerk app behaves, such as where users are redirected after signing out of their account, or whether or not Clerk's telemetry should be enabled.
This page is a reference for all available Clerk environment variables.
Compatibility
In the frontend, Clerk's environment variables work for most popular meta-frameworks, such as Next.js or Remix.
If you're building a pure React app, you should use the props on the components you're using. For example, to force users to redirect to a specific URL after signing in, you would use the signInForceRedirectUrl prop on <ClerkProvider> rather than the CLERK_SIGN_IN_FORCE_REDIRECT_URL environment variable.
Sign-in and sign-up redirects
Components, such as <ClerkProvider>, <SignIn>, and more, provide props for you to specify where users will be redirected. For example, <ClerkProvider> has the signInFallbackRedirectUrl and signUpFallbackRedirectUrl props.
However, it's recommended to use environment variables instead of these props whenever possible.
| Variable | Description |
|---|---|
CLERK_SIGN_IN_URL | Full URL or path to the sign in page. Use this variable to provide the target of the 'Sign In' link that's rendered in the <SignUp /> component. |
CLERK_SIGN_UP_URL | Full URL or path to the sign up page. Use this variable to provide the target of the 'Sign Up' link that's rendered in the <SignIn /> component. |
CLERK_SIGN_IN_FORCE_REDIRECT_URL | If provided, this URL will always be redirected to after the user signs in. |
CLERK_SIGN_UP_FORCE_REDIRECT_URL | If provided, this URL will always be redirected to after the user signs up. |
CLERK_SIGN_IN_FALLBACK_REDIRECT_URL | The fallback URL to redirect to after the user signs in, if there's no redirect_url in the path already. Defaults to /. |
CLERK_SIGN_UP_FALLBACK_REDIRECT_URL | The fallback URL to redirect to after the user signs up, if there's no redirect_url in the path already. Defaults to /. |
| Variable | Description |
|---|---|
NEXT_PUBLIC_CLERK_SIGN_IN_URL | Full URL or path to the sign in page. Use this variable to provide the target of the 'Sign In' link that's rendered in the <SignUp /> component. |
NEXT_PUBLIC_CLERK_SIGN_UP_URL | Full URL or path to the sign up page. Use this variable to provide the target of the 'Sign Up' link that's rendered in the <SignIn /> component. |
NEXT_PUBLIC_CLERK_SIGN_IN_FORCE_REDIRECT_URL | If provided, this URL will always be redirected to after the user signs in. |
NEXT_PUBLIC_CLERK_SIGN_UP_FORCE_REDIRECT_URL | If provided, this URL will always be redirected to after the user signs up. |
NEXT_PUBLIC_CLERK_SIGN_IN_FALLBACK_REDIRECT_URL | The fallback URL to redirect to after the user signs in, if there's no redirect_url in the path already. Defaults to /. |
NEXT_PUBLIC_CLERK_SIGN_UP_FALLBACK_REDIRECT_URL | The fallback URL to redirect to after the user signs up, if there's no redirect_url in the path already. Defaults to /. |
Clerk Publishable and Secret Keys
To access your Clerk app in your local project, you must specify your app's Publishable Keys for use in the frontend, and Secret Keys for use in the backend.
You can find these keys on the API keys page in the Clerk Dashboard.
| Variable | Description |
|---|---|
CLERK_PUBLISHABLE_KEY | Your Clerk app's Publishable Key. It will be prefixed with pk_test_ in development instances and pk_live_ in production instances. |
CLERK_SECRET_KEY | Your Clerk app's Secret Key, which you can find in the Clerk Dashboard. It will be prefixed with sk_test_ in development instances and sk_live_ in production instances. Do not expose this on the frontend with a public environment variable. |
| Variable | Description |
|---|---|
NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY | Your Clerk app's Publishable Key, which you can find in the Clerk Dashboard. It will be prefixed with pk_test_ in development instances and pk_live_ in production instances. |
CLERK_SECRET_KEY | Your Clerk app's Secret Key, which you can find in the Clerk Dashboard. It will be prefixed with sk_test_ in development instances and sk_live_ in production instances. Do not expose this on the frontend with a public environment variable. |
API and SDK configuration
The following environment variables enable you to configure API and SDK behavior, such as what version of the SDK your project uses, what proxy URL you use to connect to Clerk's Frontend API, and more.
| Variable | Description |
|---|---|
CLERK_JS_URL | Sets the URL that @clerk/clerk-react should hot-load @clerk/clerk-js from. CLERK_JS does the same but is deprecated. |
CLERK_JS_VERSION | Sets the npm version for @clerk/clerk-js. |
CLERK_API_URL | Sets the Clerk API URL for debugging. Defaults to "https://api.clerk.com" |
CLERK_API_VERSION | Sets the version of the Clerk API to use. Defaults to "v1" |
CLERK_JWT_KEY | Sets the JWT verification key that Clerk will use to provide networkless JWT session token verification. Refer to Manual JWT verification. |
CLERK_FAPI | Sets the URL to your Clerk apps' Frontend API. |
CLERK_PROXY_URL | Sets the URL for your proxy. |
| Variable | Description |
|---|---|
NEXT_PUBLIC_CLERK_JS_URL | Sets the URL that @clerk/clerk-react should hot-load @clerk/clerk-js from. NEXT_PUBLIC_CLERK_JS does the same but is deprecated. |
NEXT_PUBLIC_CLERK_JS_VERSION | Sets the npm version for @clerk/clerk-js. |
NEXT_PUBLIC_CLERK_API_URL | Sets the Clerk API URL for debugging. Defaults to "https://api.clerk.com" |
NEXT_PUBLIC_CLERK_API_VERSION | Sets the version of the Clerk API to use. Defaults to "v1" |
NEXT_PUBLIC_CLERK_FAPI | Sets the URL to your Clerk app's Frontend API. |
NEXT_PUBLIC_CLERK_PROXY_URL | Sets the URL for your proxy. |
CLERK_ENCRYPTION_KEY | Sets the encryption key to securely propagate clerkMiddleware dynamic keys during request time. A 128-bit, pseudorandom value should be used. See Dynamic keys to learn more. |
CLERK_JWT_KEY | Sets the JWT verification key that Clerk will use to provide networkless JWT session token verification. Refer to Manual JWT verification. |
Satellite domains
Clerk supports sharing sessions across different domains by adding one or many satellite domains to an application. See the satellite domains guide for more information.
| Variable | Description |
|---|---|
CLERK_DOMAIN | Sets your satellite application's domain. Required to share sessions across multiple domains. |
CLERK_IS_SATELLITE | Indicates whether or not the application is a satellite application. |
| Variable | Description |
|---|---|
NEXT_PUBLIC_CLERK_DOMAIN | Sets your satellite application's domain. Required to share sessions across multiple domains. |
NEXT_PUBLIC_CLERK_IS_SATELLITE | Indicates whether or not the application is a satellite application. |
Telemetry
Clerk provides environment variables for opting out of telemetry data collection. See the telemetry documentation for more information.
| Variable | Description |
|---|---|
CLERK_TELEMETRY_DISABLED | Set this to 1 to disable Clerk's telemetry data collection. |
CLERK_TELEMETRY_DEBUG | Set this to 1 to prevent telemetry data from being sent to Clerk. It will be logged to the console instead. |
| Variable | Description |
|---|---|
NEXT_PUBLIC_CLERK_TELEMETRY_DISABLED | Set this to 1 to disable Clerk's telemetry data collection. |
NEXT_PUBLIC_CLERK_TELEMETRY_DEBUG | Set this to 1 to prevent telemetry data from being sent to Clerk. It will be logged to the console instead. |
Deprecated
The following environment variables are deprecated but still supported to avoid breaking changes. Don't use them in new projects. It is recommended to switch to using the recommended alternatives in old projects.
| Variable | Description |
|---|---|
CLERK_AFTER_SIGN_UP_URL | Full URL or path to navigate to after successful sign up. Defaults to /. CLERK_SIGN_UP_FALLBACK_URL and CLERK_SIGN_UP_FORCE_REDIRECT_URL have priority and should be used instead. |
CLERK_AFTER_SIGN_IN_URL | Full URL or path to navigate to after successful sign in. Defaults to /. CLERK_SIGN_IN_FALLBACK_URL and CLERK_SIGN_IN_FORCE_REDIRECT_URL have priority and should be used instead. |
| Variable | Description |
|---|---|
NEXT_PUBLIC_CLERK_AFTER_SIGN_UP_URL | Full URL or path to navigate to after successful sign up. Defaults to /. NEXT_PUBLIC_CLERK_SIGN_UP_FALLBACK_REDIRECT_URL and NEXT_PUBLIC_CLERK_SIGN_UP_FORCE_REDIRECT_URL have priority and should be used instead. |
NEXT_PUBLIC_CLERK_AFTER_SIGN_IN_URL | Full URL or path to navigate to after successful sign in. Defaults to /. NEXT_PUBLIC_CLERK_SIGN_IN_FALLBACK_REDIRECT_URL and NEXT_PUBLIC_CLERK_SIGN_IN_FORCE_REDIRECT_URL have priority and should be used instead. |
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