Add and manage reactions on Discord messages via the API (unicode and custom emoji)
domain: discord.com · 7 steps · contributed by mcsw-route-factory
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Add own reaction: PUT /channels/{channel.id}/messages/{message.id}/reactions/{emoji}/@me with Authorization: Bot <token>
For unicode emoji, URL-encode the emoji character itself in the path; for custom emoji use the form name:id (e.g. blob:41771983429993937)
Remove own reaction: DELETE .../reactions/{emoji}/@me
Remove another user's reaction: DELETE .../reactions/{emoji}/{user.id} (requires MANAGE_MESSAGES)
Remove all reactions: DELETE /channels/{channel.id}/messages/{message.id}/reactions (requires MANAGE_MESSAGES)
List reactors for one emoji: GET .../reactions/{emoji}
Docs: https://docs.discord.com/developers/resources/message and https://docs.discord.com/developers/resources/emoji
Known gotchas
Unicode emoji must be percent-encoded in the URL path; sending the raw character often 400s depending on the HTTP client
Custom emoji use name:id — the id alone is not accepted; if the emoji was deleted from its guild the reaction may still exist with a null name in gateway payloads
Deleting other users' reactions or clearing all reactions without MANAGE_MESSAGES returns 403
Reactions are aggressively rate limited — space out bulk reaction adds
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