Authenticate to the Johnson Controls Metasys REST API
domain: docs.johnsoncontrols.com · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Have a Security Administrator create/confirm a Metasys user account with API access enabled
POST credentials to the /login operation to obtain a bearer access token
Attach the token as "Authorization: Bearer {accessToken}" on all subsequent calls — this covers every operation except Streaming
Note that token expiration is tied to the user's configured Metasys profile, not a single fixed global value
For the Streaming (Server-Sent Events) operation specifically, use API key authentication instead of a bearer header, since browsers can't set custom headers on SSE connections
Known gotchas
Streaming deliberately breaks from bearer-token auth — don't assume every endpoint accepts the same auth header
Token lifetime varies per user profile, so a hardcoded expiry assumption in client code will eventually be wrong for some accounts
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