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Authentication Errors

`invalid_auth`

Error: invalid_auth
{"ok":false,"error":"invalid_auth"}

Occurs when bot token is expired, revoked, or malformed. Terminal output shows HTTP 200 with error payload.

`not_authed`

Error: not_authed
{"ok":false,"error":"not_authed","response_metadata":{}}

API call made without authentication token or token missing from request headers.

`account_inactive`

Error: account_inactive
{"ok":false,"error":"account_inactive"}

Bot user account has been deactivated or workspace access revoked.

`token_expired`

SlackApiError: token_expired
    at SlackClient.postMessage (/node_modules/@slack/web-api/dist/WebClient.js:123:45)

OAuth access token expired. Refresh token required for renewal.

`missing_scope`

Error: missing_scope
{"ok":false,"error":"missing_scope","needed":"channels:read","provided":["chat:write"]}

Bot token lacks required OAuth scope. Terminal shows needed and provided scopes in error response.

Rate Limiting Errors

`rate_limited`

Error: rate_limited
HTTP 429 Too Many Requests
Retry-After: 60
{"ok":false,"error":"rate_limited","retry_after":60}

Rate limit exceeded. Check Retry-After header value for seconds to wait.

`ratelimited`

SlackApiError: ratelimited
    at handlePlatformError (/slack-sdk/dist/errors.js:89:12)

SDK throws exception when rate limit hit. Requires exponential backoff implementation.

API Request Errors

`invalid_arguments`

Error: invalid_arguments
{"ok":false,"error":"invalid_arguments","response_metadata":{"messages":["[ERROR] missing required field: channel"]}}

Request missing required parameters. Terminal shows specific missing fields in messages array.

`channel_not_found`

Error: channel_not_found
{"ok":false,"error":"channel_not_found"}

Channel ID or name doesn't exist or bot lacks access.

`not_in_channel`

Error: not_in_channel
{"ok":false,"error":"not_in_channel"}

Bot not member of channel. Must join channel before posting messages.

`message_too_long`

Error: message_too_long
{"ok":false,"error":"message_too_long"}

Message text exceeds 4000 character limit for chat.postMessage.

`invalid_blocks`

Error: invalid_blocks
{"ok":false,"error":"invalid_blocks","response_metadata":{"messages":["[ERROR] blocks[0].type must be one of: section, divider, image, actions, context, input, file, header, video, rich_text"]}}

Block Kit JSON structure invalid. Terminal shows specific validation errors.

Webhook & Events API Errors

`invalid_request`

Error: invalid_request
HTTP 400 Bad Request
{"error":"invalid_request","error_description":"The request is missing a required parameter"}

Webhook request missing required parameters like token, team_id, or api_app_id.

`invalid_signature`

Error: invalid_signature
HTTP 401 Unauthorized
X-Slack-Signature: v0=abc123...

Webhook signature verification failed. Timestamp skew or incorrect signing secret.

`challenge_failed`

Error: challenge_failed
{"challenge":"3eZbrw1aBd2rqRg0TbGCM6","type":"url_verification"}

Events API URL verification challenge response incorrect or missing.

SDK-Specific Errors

Python SDK: `slack.errors.SlackApiError`

Traceback (most recent call last):
  File "slack_bot.py", line 45, in <module>
    response = client.chat_postMessage(channel="#general", text="Hello")
  File "/venv/lib/python3.9/site-packages/slack/web/client.py", line 234, in chat_postMessage
    raise SlackApiError(message=error, response=response)
slack.errors.SlackApiError: The request to the Slack API failed.
The server responded with: {'ok': False, 'error': 'invalid_auth'}

Node.js SDK: `Error [SlackAPIError]`

Error [SlackAPIError]: An API error occurred: invalid_auth
    at WebClient.apiCall (/node_modules/@slack/web-api/dist/WebClient.js:185:25)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)

Ruby SDK: `Slack::Web::Api::Errors::SlackError`

Slack::Web::Api::Errors::SlackError: invalid_auth
  from /gems/slack-ruby-client-2.0.0/lib/slack/web/api/endpoints/chat.rb:45:in `postMessage'

Go SDK: `slack.SlackError`

slack.SlackError: invalid_auth
    slack.(*Client).PostMessage(0xc0000a2000, 0xc0000b4000, 0x1234567)
        /go/pkg/mod/github.com/slack-go/slack@v0.12.0/chat.go:89

WebSocket & RTM Errors

`invalid_auth` (RTM)

Error: invalid_auth
{"ok":false,"error":"invalid_auth","url":""}

RTM WebSocket connection fails authentication. No url returned in response.

`connection_closed`

Error: connection_closed
WebSocket connection closed unexpectedly

RTM WebSocket disconnects without close frame. Requires reconnection logic.

`socket_mode_connection_failed`

Error: socket_mode_connection_failed
Failed to establish Socket Mode WebSocket connection

Socket Mode WebSocket fails to connect. Check app-level token validity.

File Upload Errors

`file_too_large`

Error: file_too_large
{"ok":false,"error":"file_too_large","max_size_bytes":1048576000}

File exceeds 1GB upload limit. Terminal shows max_size_bytes in error response.

`invalid_file_type`

Error: invalid_file_type
{"ok":false,"error":"invalid_file_type"}

File type not supported for upload. Check allowed MIME types.

`file_deleted`

Error: file_deleted
{"ok":false,"error":"file_deleted"}

File referenced by ID has been deleted from workspace.

Pagination Errors

`invalid_cursor`

Error: invalid_cursor
{"ok":false,"error":"invalid_cursor"}

Pagination cursor expired or malformed. Cursors expire after 5 minutes.

`cursor_pagination_failed`

Error: cursor_pagination_failed
{"ok":false,"error":"cursor_pagination_failed","response_metadata":{"next_cursor":""}}

Pagination request fails. next_cursor empty string indicates no more pages.

Interactive Components Errors

`action_not_found`

Error: action_not_found
{"ok":false,"error":"action_not_found"}

Interactive component action handler not registered or callback ID mismatch.

`interactive_timeout`

Error: interactive_timeout
{"ok":false,"error":"interactive_timeout"}

Interactive component response not sent within 3-second window.

`invalid_trigger_id`

Error: invalid_trigger_id
{"ok":false,"error":"invalid_trigger_id"}

Modal or interactive component trigger_id expired or already used.

Workspace & Team Errors

`team_added_to_org`

Error: team_added_to_org
{"ok":false,"error":"team_added_to_org"}

Workspace added to Enterprise Grid organization. API behavior changes.

`restricted_action`

Error: restricted_action
{"ok":false,"error":"restricted_action"}

Action restricted by workspace admin settings or Enterprise Grid policies.

`enterprise_is_restricted`

Error: enterprise_is_restricted
{"ok":false,"error":"enterprise_is_restricted"}

Enterprise Grid restriction prevents API call execution.

OAuth Flow Errors

`invalid_client_id`

Error: invalid_client_id
{"ok":false,"error":"invalid_client_id"}

OAuth client ID incorrect or app not found.

`invalid_code`

Error: invalid_code
{"ok":false,"error":"invalid_code"}

OAuth authorization code expired, already used, or invalid.

`invalid_redirect_uri`

Error: invalid_redirect_uri
{"ok":false,"error":"invalid_redirect_uri"}

OAuth redirect URI doesn't match registered redirect URLs in app settings.

Connection & Network Errors

`request_timeout`

Error: request_timeout
TimeoutError: Request timed out after 30000ms
    at Timeout._onTimeout (/node_modules/axios/lib/adapters/http.js:201:15)

API request exceeds 30-second timeout. Network congestion or Slack service degradation.

`network_error`

Error: network_error
FetchError: request to https://api.slack.com/api/chat.postMessage failed, reason: getaddrinfo ENOTFOUND api.slack.com

DNS resolution failure or network connectivity issue.

`ssl_handshake_failed`

Error: ssl_handshake_failed
Error: SSL handshake failed: unable to verify the first certificate
    at TLSSocket.onConnectSecure (_tls_wrap.js:1515:34)

SSL/TLS certificate validation failure. Corporate proxy or certificate chain issues.

Webhook Delivery Errors

`webhook_timeout`

Error: webhook_timeout
HTTP 504 Gateway Timeout
X-Slack-Retry-Num: 3

Webhook endpoint timeout after retry attempts. Check X-Slack-Retry-Num header.

`webhook_delivery_failed`

Error: webhook_delivery_failed
{"ok":false,"error":"webhook_delivery_failed","retry_after":300}

Webhook delivery failed after maximum retries. Manual event replay required.

Miscellaneous Errors

`method_deprecated`

Error: method_deprecated
{"ok":false,"error":"method_deprecated","response_metadata":{"warnings":["method_deprecated"]}}

API method deprecated. Migration to newer API version required.

`internal_error`

Error: internal_error
{"ok":false,"error":"internal_error"}

Slack server-side error. Retry request after delay.

`service_unavailable`

Error: service_unavailable
HTTP 503 Service Unavailable
{"ok":false,"error":"service_unavailable"}

Slack service temporarily unavailable. Check status page.

`fatal_error`

Error: fatal_error
{"ok":false,"error":"fatal_error"}

Critical error preventing request processing. Contact Slack support.

Is Slack giving you a headache?

Slack Integration Terminal Errors

Authentication Errors

invalid_auth

not_authed

account_inactive

token_expired

missing_scope

Rate Limiting Errors

rate_limited

ratelimited

API Request Errors

invalid_arguments

channel_not_found

not_in_channel

message_too_long

invalid_blocks

Webhook & Events API Errors

invalid_request

invalid_signature

challenge_failed

SDK-Specific Errors

Python SDK: slack.errors.SlackApiError

Node.js SDK: Error [SlackAPIError]

Ruby SDK: Slack::Web::Api::Errors::SlackError

Go SDK: slack.SlackError

WebSocket & RTM Errors

invalid_auth (RTM)

connection_closed

socket_mode_connection_failed

File Upload Errors

file_too_large

invalid_file_type

file_deleted