[Home](./index.md) > [@firebase/auth](./auth.md) > [SAMLAuthProvider](./auth.samlauthprovider.md) > [credentialFromJSON](./auth.samlauthprovider.credentialfromjson.md) ## SAMLAuthProvider.credentialFromJSON() method Creates an [AuthCredential](./auth.authcredential.md) from a JSON string or a plain object. Signature: ```typescript static credentialFromJSON(json: string | object): AuthCredential; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | json | string \| object | A plain object or a JSON string | Returns: [AuthCredential](./auth.authcredential.md)