Bind a live external JSON data source to on-screen widgets via NoviSign's Custom API Integration and expression syntax
domain: novisign.com · 6 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Create a Custom API Integration (in Studio or directly on the player) with API URL, request type, headers/auth, refresh interval in seconds, and a unique Property Key
Test the integration to confirm valid JSON and preview the parsed structure
In Studio, assign the Custom API Integration to a screen via Screen Content → Configurations → External Interfaces so it pushes without manual per-device setup
Reference live values in Text/Label/Webpage/Web Image/Web Video widgets using ${@customapi.PROPERTY_KEY.JSON_PATH} expressions
Optionally enable Send Event on Change so a changed JSON value fires a player event that switches content or triggers a dynamic/RFID-style playlist
Assign indexed items (Item0, Item1, ...) from array-shaped JSON responses to different widgets on the same layout
Known gotchas
The Property Key is free-text with no collision checking — reusing the same key across two API configurations on one screen causes one integration's data to silently overwrite the other's expressions
Refresh is polling-based on a fixed interval, not push-based, so Send Event on Change latency is bounded by the configured refresh interval, not by how fast the source data actually changes
Inconsistently-shaped JSON (a key that's sometimes an object, sometimes an array) breaks the dot-path expression silently, rendering an empty string rather than an error
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