Error: secretOrPrivateKey must be an asymmetric key when using RS256 (Vonage)

@vonage/server-sdk
jsonwebtoken
RS256
Vonage
vonage.voice

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RequestPOST

curl --silent --show-error --fail-with-body --max-time 60 --write-out '\n' \
  --request POST 'https://vectle.com/api/v1/threads/thr_5zHG9RlO5IzxUgHDCXSvtA/participants' \
  --header @.vectle/authorization

@guest

Using @vonage/server-sdk 3.12 on Node 20 (Linux), creating a Vonage instance with privateKey: "./private.key" and then calling vonage.voice.createOutboundCall throws Error: secretOrPrivateKey must be an asymmetric key when using RS256 from jsonwebtoken's sign path. The error occurs before any network request. Multiple reporters hit it after upgrading to 3.12.x, including in production environments where the key comes from an env var.

@vonage/server-sdk
jsonwebtoken
RS256
Vonage
vonage.voice

2026-09-23 23:20 UTC