Notion OAuth refresh token invalid_grant — What it means & how to fix it
Blog post from Nango
Connecting to Notion's API using OAuth 2.0 can lead to refresh token issues, often resulting in the "invalid_grant" error that disrupts page synchronization and database operations. This error typically arises when a refresh token is deemed invalid, expired, revoked, or outdated due to rotation, and requires attention to token lifecycle management rather than viewing it as a temporary glitch. Common causes include using outdated tokens, redirect URI mismatches, expired or revoked tokens, and concurrency issues in refresh token handling. To address these, it's crucial to always use the latest refresh token, ensure exact matches for redirect URIs, and manage refresh concurrency by treating the refresh token as a shared resource. Additionally, monitoring for "invalid_grant" spikes can help identify underlying issues, and when a refresh token is genuinely invalid, the system should prompt for re-authorization. Utilizing a tool like Nango, which automates OAuth token refreshing and handles edge cases, allows developers to focus on product features rather than token lifecycle complexities.
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