Reference

Environment variables

Important environment variables for API, Studio, CLI, workers, and live smokes.

API

DATABASE_URL
BETTER_AUTH_SECRET
MANIFEST_KEY_ENC_KEY_HEX
WORKER_API_TOKEN
FX_BASE_URL
FX_TRUSTED_ORIGINS
DATABRICKS_HOST
DATABRICKS_HTTP_PATH
DATABRICKS_TOKEN
DATABRICKS_CATALOG
DATABRICKS_SCHEMA

Studio

FX_API_BASE_URL
NEXT_PUBLIC_FX_API_BASE_URL

CLI hosted mode

Used by fx push and hosted fx preview.

FX_API_URL — hosted API base URL, for example https://api.example.com.
FX_API_KEY — org API key created in Studio settings.
FX_ORG_ID — organization ID used as the hosted API tenant scope.

Equivalent flags:

fx push experiments/ --api-url "$FX_API_URL" --api-key "$FX_API_KEY" --tenant "$FX_ORG_ID"

Cloudflare manifest worker

HMAC_SECRET
API_ORIGIN
DEFAULT_TENANT

Cloudflare exposure worker

DEFAULT_TENANT
FLUSH_INTERVAL_MS
MAX_BATCH_SIZE

Audit export worker

API_BASE_URL
WORKER_API_TOKEN

Harness worker

FX_HARNESS_RUNTIME
TEMPORAL_ADDRESS
TEMPORAL_NAMESPACE
FX_API_BASE_URL
FX_API_KEY
WORKER_API_TOKEN

Live smokes

FX_LIVE_TEST
FX_LIVE_API_BASE_URL
FX_LIVE_API_KEY
FX_LIVE_ORG_ID
FX_LIVE_EXPERIMENT_ID
FX_LIVE_WORKER_TOKEN

YAML schema

Experiments are authored as YAML and validated before apply.

Migrating from Mojito

Move a Mojito JS Delivery wave to a Fabric Experiments YAML — automatically, with one command.

On this page

API Studio CLI hosted mode Cloudflare manifest worker Cloudflare exposure worker Audit export worker Harness worker Live smokes