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LINE Messaging API Lets Bots Detect Edited and Unsent Messages in Group Chats

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LINE launched a free trial of its 'Edit Message' feature in LINE Labs on August 20, 2026, allowing users to correct sent text messages within 15 minutes. LINE Taiwan Developer Relations Lead Evan Lin explored how the LINE Messaging API's Edit and Unsend webhook events allow bots to detect and respond to these user-initiated message changes. Lin built a demo group-buying bot called 'Dan Dan' to illustrate how a bot can update order records in real time when a user edits or unsends a message. Without handling these events, a bot's backend data can fall out of sync with what users see in the chat, creating discrepancies in order tracking. Currently, message editing is only supported in group chats with bots, not in one-on-one chats with LINE Official Accounts, and only text messages are editable.

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