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Joins a channel, creating it if needed.


Method URL:
Preferred HTTP method: POST
Accepted content types: application/x-www-form-urlencoded, application/json
Rate limiting: Tier 3
Works with:
Token type Required scope(s)
user channels:write post

This method is used to join a channel. If the channel does not exist, it is created.

The members array found in this and other methods will begin automatically truncating at 1,500 results beginning December 1, 2017. Please Use conversations.members to manage memberships instead. Read on to learn more.


Argument Example Required Description
token xxxx-xxxxxxxxx-xxxx Required

Authentication token bearing required scopes.

name #general Required

Name of channel to join

validate true Optional

Whether to return errors on invalid channel name instead of modifying it to meet the specified criteria.

This method supports application/json via HTTP POST. Present your token in your request's Authorization header. Learn more.


If successful, the command returns a channel object, including state information.

Typical success response

    "ok": true,
    "channel": {
        "id": "C1H9RESGL",
        "name": "busting",
        "is_channel": true,
        "created": 1466025154,
        "creator": "U0G9QF9C6",
        "is_archived": false,
        "is_general": false,
        "name_normalized": "busting",
        "is_shared": false,
        "is_org_shared": false,
        "is_member": true,
        "is_private": false,
        "is_mpim": false,
        "members": [
        "topic": {
            "value": "My Topic",
            "creator": "U0G9QF9C6",
            "last_set": 1503435128
        "purpose": {
            "value": "My Purpose",
            "creator": "U0G9QF9C6",
            "last_set": 1503435128
        "previous_names": []
    "already_in_channel": true

If you are already in the channel, the response is slightly different. already_in_channel will be true, and a limited channel object will be returned. This allows a client to see that the request to join GeNERaL is the same as the channel #general that the user is already in.

    "ok": true,
    "already_in_channel": true,
    "channel": {
        "id": "C024BE91L",
        "name": "fun",
        "created": 1360782804,
        "creator": "U024BE7LH",
        "is_archived": false,
        "is_general": false

Typical error response

    "ok": false,
    "error": "channel_not_found"


This table lists the expected errors that this method could return. However, other errors can be returned in the case where the service is down or other unexpected factors affect processing. Callers should always check the value of the ok params in the response.

Error Description

Value passed for channel was invalid.


A channel cannot be created with the given name.


A team preference prevents the authenticated user from creating channels.


Value passed for name was empty.


Channel has been archived.


Value passed for name was empty.


Value passed for name contained only punctuation.


Value passed for name exceeded max length.


Value passed for name contained unallowed special characters or upper case characters.


Value passed for name was invalid.


No authentication token provided.


Some aspect of authentication cannot be validated. Either the provided token is invalid or the request originates from an IP address disallowed from making the request.


Authentication token is for a deleted user or workspace.


Authentication token is for a deleted user or workspace or the app has been removed.


The workspace token used in this request does not have the permissions necessary to complete the request.


This method cannot be called by a bot user.


This method cannot be called by a restricted user or single channel guest.


The method was passed an argument whose name falls outside the bounds of accepted or expected values. This includes very long names and names with non-alphanumeric characters other than _. If you get this error, it is typically an indication that you have made a very malformed API call.


The method was passed a PHP-style array argument (e.g. with a name like foo[7]). These are never valid with the Slack API.


The method was called via a POST request, but the charset specified in the Content-Type header was invalid. Valid charset names are: utf-8 iso-8859-1.


The method was called via a POST request with Content-Type application/x-www-form-urlencoded or multipart/form-data, but the form data was either missing or syntactically invalid.


The method was called via a POST request, but the specified Content-Type was invalid. Valid types are: application/x-www-form-urlencoded multipart/form-data text/plain.


The method was called via a POST request and included a data payload, but the request did not include a Content-Type header.


The workspace associated with your request is currently undergoing migration to an Enterprise Organization. Web API and other platform operations will be intermittently unavailable until the transition is complete.


The method was called via a POST request, but the POST data was either missing or truncated.


The server could not complete your operation(s) without encountering a catastrophic error. It's possible some aspect of the operation succeeded before the error was raised.


This table lists the expected warnings that this method will return. However, other warnings can be returned in the case where the service is experiencing unexpected trouble.

Warning Description

A members array included in a channel object was truncated at 1500 results. Use conversations.members to retrieve all results.


The method was called via a POST request, and recommended practice for the specified Content-Type is to include a charset parameter. However, no charset was present. Specifically, non-form-data content types (e.g. text/plain) are the ones for which charset is recommended.


The method was called via a POST request, and the specified Content-Type is not defined to understand the charset parameter. However, charset was in fact present. Specifically, form-data content types (e.g. multipart/form-data) are the ones for which charset is superfluous.