Overview

Upvotes or downvotes a Reddit comment by its ID. This endpoint uses Reddit's GraphQL API to cast your vote on any comment.

Inputs

| Field | Type | Required | Description | |-------|------|----------|-------------| | commentid | string | Yes | The Reddit comment ID (e.g., t1oxy9djb) | | direction | select | Yes | Vote direction: UP (default) or DOWN |

Direction options

UP - Upvote the comment (default)
DOWN - Downvote the comment

Response

Returns the GraphQL mutation response from Reddit:

{
  "data": {
    "updateCommentVoteState": {
      "comment": {
        "id": "t1_xxxxx",
        "voteState": "UPVOTE"
      }
    }
  }
}

Auth & browser

Requires authentication: Yes (uses browser session cookies)
useContext: Enabled - shares cookies with authenticated Reddit session
You must be logged into Reddit in the browser context

Examples

Upvote a comment:

{
  "comment_id": "t1_oxy9djb",
  "direction": "UP"
}

Downvote a comment:

{
  "comment_id": "t1_oxy9djb",
  "direction": "DOWN"
}

Notes

Comment ID format: Use the full Reddit comment ID starting with t1_ (found in URLs or via post-details endpoint)
Rate limiting: Reddit enforces vote rate limits
Double voting: Calling the same vote direction twice has no additional effect
Changing votes: Call again with the opposite direction to change your vote
Comment visibility: You can only vote on comments you can see (locked/deleted comments cannot be voted on)