Agent skill

monday.com Webhooks Skill

Receive and verify monday.com webhooks. Use when setting up monday.com webhook handlers, implementing the challenge handshake, debugging JWT verification, or handling board events like create_item, change_column_value, change_status_column_value, create_update, or create_subitem.

Install this skill

npx skills add hookdeck/webhook-skills --skill monday-webhooks

When to Use This Skill

  • Setting up monday.com webhook handlers
  • Implementing the challenge handshake required at registration
  • Debugging JWT (Authorization header) verification failures
  • Understanding monday.com event types and the event payload wrapper
  • Handling board, column, subitem, and update events

Two things every monday.com endpoint must do

monday.com webhooks are unusual — there are two separate checks, not one:

  1. Challenge handshake (required). When a webhook is created, monday.com POSTs { "challenge": "<token>" }. Your endpoint must echo it back as { "challenge": "<token>" } or registration fails. This is the only check guaranteed for every webhook, including no-code and personal-token webhooks.
  2. JWT verification (when present). For webhooks created by an integration app, monday.com signs each request with a JWT in the Authorization header (HS256), signed with your app's Signing Secret. Verify it with a JWT library. Webhooks created with a personal API token or the no-code board integration may not send this header.

monday.com does not follow the Standard Webhooks spec, and the JWT is not an HMAC over the request body — it is a self-contained token that authenticates the sender. Because verification never reads the body, parsing JSON before verifying is safe here (unlike Stripe/GitHub HMAC schemes).

Verification (core)

import { jwtVerify } from 'jose';

// monday.com signs each request with a JWT in the Authorization header (HS256),
// signed with your app's Signing Secret (board webhooks) or Client Secret
// (app lifecycle webhooks). jwtVerify throws on a bad signature or expiry.
async function verifyMondayJwt(authHeader, secret) {
  if (!authHeader) throw new Error('Missing Authorization header');
  const token = authHeader.startsWith('Bearer ')
    ? authHeader.slice(7)
    : authHeader;                              // monday sends the raw token
  const { payload } = await jwtVerify(
    token,
    new TextEncoder().encode(secret),
    { algorithms: ['HS256'] }
  );
  return payload; // { accountId, userId, aud, exp, iat, ... }
}

// On registration monday POSTs { "challenge": "<token>" } — echo it back first:
//   if (body.challenge) return res.status(200).json({ challenge: body.challenge });

For complete handlers with route wiring, event dispatch, and tests, see:

Common Event Types

Subscribe to one event per webhook via the create_webhook GraphQL mutation.

EventTriggered When
create_itemA new item (pulse) is created on the board
change_column_valueAny column value changes
change_status_column_valueA status column value changes
change_nameAn item's name changes
create_updateAn update (comment) is posted on an item
create_subitemA subitem is created (payload adds parentItemId)
item_archivedAn item is archived
item_deletedAn item is deleted

For the full event list, see monday.com Webhooks docs.

Payload Structure

Real events wrap their data in an event object:

{
  "event": {
    "type": "change_column_value",
    "userId": 9603417,
    "boardId": 1771812698,
    "pulseId": 1772099344,
    "pulseName": "My item",
    "columnId": "status",
    "value": { "label": { "text": "Done" } },
    "triggerTime": "2021-10-11T09:24:03.960Z",
    "subscriptionId": 73759690,
    "triggerUuid": "b12b..."
  }
}

Environment Variables

# App "Signing Secret" for board/integration webhooks
# (use the app "Client Secret" for app lifecycle webhooks)
MONDAY_SIGNING_SECRET=your_signing_secret_here

Local Development

# Start tunnel (no account needed)
npx hookdeck-cli listen 3000 monday --path /webhooks/monday

Reference Materials