Build and deploy a serverless mini-app (Edge App) to a Screenly Player fleet using the Screenly CLI and Edge Apps manifest
domain: developer.screenly.io · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Install and log in to the Screenly CLI, then scaffold a new app with `screenly edge-app create --name <app>`
Define configurable settings/secrets (e.g., an API key) in the generated screenly.yml manifest, marking sensitive values as type: secret
Build index.html, or configure a remote entrypoint with --entrypoint plus a screenly_inject.js snippet for authenticating against a remote page
Deploy with `screenly edge-app deploy`, which uploads the app, replaces any prior revision, and syncs manifest settings to the server
Create one or more instances with `screenly edge-app instance create`, each with its own settings, then schedule that instance as an asset on a screen
Update a live instance's config with `screenly edge-app setting set <key>=<value>` without redeploying code
Known gotchas
Every device instance auto-updates to the latest deployed revision — there is no per-instance version pinning, so a bad deploy immediately affects every screen running that Edge App
Secrets are write-only by design (unreadable via API/CLI once set), which breaks naive diff-and-reapply provisioning scripts that assume all config is retrievable
Edge Apps only support relative asset paths; absolute paths silently fail to load rather than raising a build-time error
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