[Home](./index.md) > [@firebase/auth](./auth.md) > [OAuthCredential](./auth.oauthcredential.md) > [fromJSON](./auth.oauthcredential.fromjson.md) ## OAuthCredential.fromJSON() method Static method to deserialize a JSON representation of an object into an [AuthCredential](./auth.authcredential.md). Signature: ```typescript static fromJSON(json: string | object): OAuthCredential | null; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | json | string \| object | Input can be either Object or the stringified representation of the object. When string is provided, JSON.parse would be called first. | Returns: [OAuthCredential](./auth.oauthcredential.md) \| null If the JSON input does not represent an [AuthCredential](./auth.authcredential.md), null is returned.