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Configuring Version 5

The following environment variables can be set to configure the Coral Server. You can expose them in your shell via export NODE_ENV=development or by placing the variables in a .env file in the root of the project in a simple NODE_ENV=development format delimited by newlines.


Can be one of production or development. All production deployments should use production. Defaults to production when ran with npm run start and development when run with npm run start:development.


The port to listen for HTTP and Websocket requests. (Default 3000)


The port where the Webpack Development server is running on. (Default 8080)


The MongoDB database URI to connect to. (Default mongodb://


The Redis database URI to connect to. (Default redis://


A JSON string with optional configuration options to be used when connecting to Redis as specified in the ioredis documentation. (Default: {})


The shared secret to use to sign JSON Web Tokens (JWT) with the selected signing algorithm. (Default: keyboard cat) 🚨 Don’t forget to set this variable! 🚨


The signing algorithm to use for signing JWT’s. (Default HS256).


The number of worker nodes to spawn to handle web traffic, this should be tied to the number of CPU’s available. (Default os.cpus().length)


Specify the default locale to use for all requests without a locale specified. (Default en-US)


The logging level that can be set to one of fatal, error, warn, info, debug, or trace. (Default info)


Disables mounting of client routes for developing with Webpack Dev Server (Default false)


Forces SSL in production by redirecting all HTTP requests to HTTPS, and sending HSTS headers. (Default false)

By default, Coral does not use HTTPS. If you want to enable HTTPS, you must configure a proxy in front of Coral such as Caddy.

Troubleshooting: If you are seeing redirect loops when trying to access pages like the admin, you may need to configure TRUST_PROXY to tell Coral which upstream proxies to trust.

Warning: When FORCE_SSL=true, Coral will send HSTS headers that will force web browsers to connect via HTTPS for the next 60 days. By forcing SSL use you’ll need to provide a secure connection to your Coral instance for at least the next 60 days.


When true, disables subscriptions for the comment stream for all stories across all tenants (Default false)


When true, Coral will not perform indexing operations when it starts up. This can be desired when you’ve already installed Coral on the target MongoDB, but want to improve start performance.

You should not use this parameter unless you know what you’re doing! Upgrades may introduce additional indexes that the application relies on. (Default false)


Disables the rate limiters in development. This will only work when also set to a development environment (Default false)


When true, all tenants will be loaded from the database when needed rather than keeping a in-memory copy in sync via published events on Redis. (Default false)


When true, it will enable the /graphiql even in production, use with care. (Default false)


The username for Basic Authentication at the /metrics and /cluster_metrics endpoint.


The password for Basic Authentication at the /metrics and /cluster_metrics endpoint.


If CONCURRENCY is more than 1, the metrics are provided at this port under /cluster_metrics. (Default 3001)


The request timeout (in ms) for scraping operations (Default 10 seconds)


The URI that static assets can be accessed from. This URI can be to a proxy that uses this Coral server on PORT as the upstream. Disabled by default.


When provided, it configures the “trust proxy” settings for Express. If you are encountering issues where urls in the administration are showing with a http instead of https, you may need to set the TRUST_PROXY setting. Refer to for possible values of this configuration variable as it pertains to your setup.


A duration in a parsable format (e.g. 30 seconds, 1 minute) that should be used to send keep alive messages through the websocket to keep the socket alive (Default 30 seconds)