关于Expo Push Notification令牌大小的技术咨询

Great question — this is a key detail for setting up your database schema correctly when storing user push tokens!

From my experience working with Expo Push Notifications, here's what you need to know:

• Expo push tokens follow the standard format: ExponentPushToken[xxxxxxxxxxxxxxxxxxxxxxxx]
• The inner segment (the alphanumeric string inside the brackets) is a 24-character base64-encoded value
• When combined with the full wrapper, the total length of a valid Expo push token is exactly 43 characters

That said, to account for any potential minor format adjustments Expo might make in future updates (though this is rare), I'd recommend setting your database field to VARCHAR(255). It's a safe, future-proof choice that doesn't waste unnecessary storage but gives you plenty of room to avoid truncation issues.

This is a common practice in production systems handling push notifications, so you can feel confident using this setup.

内容的提问来源于stack exchange，提问作者Jean de Lavarene