Get machine-to-machine access tokens from Auth0 correctly
domain: auth0.com · 4 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Create an API (audience) and an M2M application authorized for it with scopes
POST /oauth/token with grant_type=client_credentials, client_id/secret, audience
Cache the token until exp — do NOT fetch per request
Validate on the API side: RS256 signature against JWKS, iss, aud, exp
Known gotchas
M2M tokens are billed per-token on many plans — fetching one per request gets expensive and rate-limited fast
The audience must exactly match the API identifier (a URI string, not necessarily a real URL)
Tokens can't be revoked — keep TTLs short and rotate secrets on leak
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