Service account object must contain a string \"private_key\" property."}

[6174]

Describe the bug
New to next.js & firebase, my code is the same with example, but stuck on this issue, I find the same issue in the issue list, but no solution.

the code

firebaseAdminInitConfig: {
      credential: {
        privateKey: process.env.FIREBASE_PRIVATE_KEY
          ? JSON.parse(process.env.FIREBASE_PRIVATE_KEY)
          : undefined,
      },
    },

Versions

next-firebase-auth version:
Firebase JS SDK: ^9.9.0
Next.js: 12.2.2

Additional context
I log out the private key with JSON.parse

pk {
  type: 'service_account',
  project_id: 'xxxx',
  private_key_id: 'xxxx',
  private_key: '-----BEGIN PRIVATE KEY-----\n' +
    'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' +
    'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' +
    'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx' +

[kmjennison]

You should confirm that the credential.privateKey value is only the private key, not the whole service account object. In local development, you could try hardcoding the private key in the next-firebase-auth config rather than using environment variables at all—just to make sure it works.

Related, this thread includes suggestions on formatting the private key:
#95

[6174]

Thx, change the "whole service account object" to key string fixed the issue.