emulate

Slack API

Fully stateful Slack Web API emulation with channels, messages, threads, reactions, OAuth v2, and incoming webhooks. State changes dispatch event_callback payloads to configured webhook URLs.

Auth

  • POST /api/auth.test - test authentication

Chat

  • POST /api/chat.postMessage - post message (supports threads via thread_ts)
  • POST /api/chat.update - update message
  • POST /api/chat.delete - delete message
  • POST /api/chat.meMessage - /me message

Conversations

  • POST /api/conversations.list - list channels (cursor pagination)
  • POST /api/conversations.info - get channel info
  • POST /api/conversations.create - create channel
  • POST /api/conversations.history - channel history (top-level messages)
  • POST /api/conversations.replies - thread replies
  • POST /api/conversations.join - join channel
  • POST /api/conversations.leave - leave channel
  • POST /api/conversations.members - list members

Users

  • POST /api/users.list - list users (cursor pagination)
  • POST /api/users.info - get user info
  • POST /api/users.lookupByEmail - lookup by email

Reactions

  • POST /api/reactions.add - add reaction
  • POST /api/reactions.remove - remove reaction
  • POST /api/reactions.get - get reactions for a message

Team

  • POST /api/team.info - get workspace info

Bots

  • POST /api/bots.info - get bot info

Incoming Webhooks

  • POST /services/:teamId/:botId/:webhookId - post via incoming webhook (supports channel override and thread_ts)

OAuth

  • GET /oauth/v2/authorize - authorization endpoint (shows user picker)
  • POST /api/oauth.v2.access - token exchange

Event Dispatching

When messages are posted or reactions change, the emulator dispatches event_callback payloads to configured webhook URLs matching Slack's Events API format:

  • message events on chat.postMessage, chat.update, chat.delete
  • reaction_added / reaction_removed events on reactions.add / reactions.remove
  • message with subtype: bot_message on incoming webhook posts