monday.com API, Webhooks and Apps: A Developer’s Guide

Custom integrations transform monday.com from a powerful project management platform into a central hub that connects every tool in your tech stack. Whether you need to sync data between systems, automate cross-platform workflows, or build entirely new functionality, monday.com’s integration ecosystem gives you the flexibility to create exactly what your business needs.

This developer’s guide covers the monday.com API and webhooks, custom app development and Marketplace publishing, as of 2026. Want it built for you instead? Our monday.com integrations team scopes and builds it.

What Are Custom Integrations on monday.com?

Custom integrations are connections between monday.com and other software systems that automate data flow, trigger actions across platforms, and extend monday.com’s native capabilities. Unlike pre-built integrations that connect popular apps with one-click setups, custom integrations are built specifically for your unique workflows and requirements.

Types of Custom Integrations

Why Build Custom Integrations?

monday.com offers 850+ pre-built integrations and apps with popular tools like Slack, Gmail, Zoom, and Salesforce. So when does it make sense to build a custom integration instead?

When Pre-Built Integrations Fall Short

What This Looks Like in Practice

Example: Healthcare Operations

Take a multi-location healthcare provider that needs patient appointment data from its legacy scheduling system in monday.com for operations management. The scheduling system has an API but no monday.com integration.

A custom integration on the monday.com API can:

• Pull appointment data every 15 minutes
• Create items on location-specific boards with patient name (anonymized), appointment type, and assigned provider
• Update item statuses when appointments are completed in the scheduling system
• Post a Slack message when emergency appointments are added

Result: Operations managers see every location without switching between systems, and manual data entry goes away. If you would rather not build and maintain this yourself, our monday.com integration services team can.

monday.com API: Complete Overview

The monday.com API is a GraphQL-based interface that provides programmatic access to nearly every feature and data point in the platform. Most of what you do in the web interface can be automated through the API (monday.com lists its API coverage gaps in the developer docs).

API Architecture

What You Can Do with the API

The monday.com API gives you full read and write access to:

API Authentication

There are two authentication methods depending on your use case:

Getting Your Personal API Token:

Basic API Query Structure

Here’s a simple query to get all boards in your account:

query {
  boards {
    id
    name
    state
    board_kind
  }
}

And a mutation to create a new item:

mutation {
  create_item (
    board_id: 123456789,
    group_id: "topics",
    item_name: "New Project",
    column_values: "{\"status\":\"Working on it\",\"date\":\"2026-03-01\"}"
  ) {
    id
    name
  }
}

API Rate Limits & Complexity

monday.com uses several limits: queries per minute (1,000, or 2,500 on Pro and 5,000 on Enterprise), daily calls (200 on Free, 1,000 on Basic and Standard; 10,000 on Pro; 25,000 on Enterprise), and a complexity score for each query based on how much data it retrieves (monday.com developer docs).

Complexity budget: 10 million points per minute shared across personal API tokens; app tokens get 5 million for reads and 5 million for writes; trial, free and nonprofit accounts get 1 million.

Best practice: Query only the fields you need. Don’t request all columns if you only need item names and IDs.

Common API Use Cases

1. Data Import & Migration

Moving data from spreadsheets, legacy systems, or other project management tools into monday.com.

2. Automated Reporting

Generate custom reports by pulling data from multiple boards and analyzing it externally.

3. Cross-Platform Workflow Automation

Sync data between monday.com and other business systems like CRM, ERP, or ticketing tools.

4. Custom Validation & Data Quality

Enforce business rules that monday.com’s native validation can’t handle.

5. Advanced Item Management

Operations that require complex logic or batch processing.

Need help building custom API integrations? Book a free 30-minute consultation to discuss your use case →

Webhooks: Real-Time Event Notifications

Webhooks are the bridge between monday.com and external systems. Instead of constantly polling the API to check for changes, webhooks send instant notifications to your server whenever specific events occur in monday.com.

How Webhooks Work

Event Types You Can Monitor

monday.com supports webhooks for these board-level events:

Setting Up Webhooks

You can create webhooks via the API or through the monday.com UI.

Via API:

mutation {
  create_webhook (
    board_id: 123456789,
    url: "https://yourdomain.com/webhook-endpoint",
    event: create_item
  ) {
    id
    board_id
  }
}

Via UI:

Webhook Payload Structure

When an item is created, monday.com sends a POST request like this (sample from the webhooks reference):

{
  "event": {
    "userId": 9603417,
    "originalTriggerUuid": null,
    "boardId": 1771812698,
    "pulseId": 1772099344,
    "pulseName": "Create_item webhook",
    "groupId": "topics",
    "groupName": "Group Title",
    "groupColor": "#579bfc",
    "isTopGroup": true,
    "columnValues": {},
    "app": "monday",
    "type": "create_pulse",
    "triggerTime": "2021-10-11T09:07:28.210Z",
    "subscriptionId": 73759690,
    "triggerUuid": "b5ed2e17c530f43668de130142445cba"
  }
}

Webhook Security Best Practices

Webhook Challenges & Solutions

Challenge #1: Webhook Endpoint Availability

If your endpoint fails, monday.com retries the request once a minute for 30 minutes (monday.com developer docs).

Solution: Use a queue-based architecture. Your webhook endpoint receives the payload, immediately responds with HTTP 200, then processes the data asynchronously.

Challenge #2: Duplicate Events

monday.com may send the same event multiple times if network issues occur during delivery, and a duplicate event can mean a duplicate item in monday.com.

Solution: Include deduplication logic. Store processed event IDs (with timestamps) in a database and skip events you’ve already handled within the last 5 minutes.

Challenge #3: Rate Limiting Your Endpoint

High-volume boards can trigger hundreds of webhooks per minute during bulk operations.

Solution: Implement rate limiting and batching on your end. Queue incoming webhooks and process them in controlled batches rather than one-by-one.

Example: Event Date Sync Across Boards

Take a live event production company where each event is coordinated across 9 boards (Venue, Band, Crew, Production, Marketing, Ticketing, Budget, Travel, Post-Event).

It needs real-time synchronization: when a show date changes in the CRM board, it has to update across all 9 project boards automatically.

A webhook-based integration can:

• Register a webhook on the CRM board for change_column_value events on the date column
• When triggered, query the monday.com API to find all related project boards (linked via show ID)
• Update the date column on all 9 boards in one request (one aliased mutation per board)
• Send confirmation notifications to project managers via Slack

Result: A date change in the CRM reaches every project board without manual edits.

Custom App Development

Custom apps are full-featured applications built on the monday.com apps framework. They can include custom UI views, widgets, workflow integrations, and more — all embedded directly inside the monday.com interface.

Types of Custom Apps

monday.com Apps Framework

The apps framework provides:

Frontend SDK:

• JavaScript/React libraries for building UI components
• Pre-built UI elements that match monday.com’s design system
• Communication layer between your app and monday.com platform

Backend Infrastructure:

• OAuth authentication flow
• Secure token storage
• Webhook registration and management

Development Tools:

• Local development environment with hot reload
• Testing tools and sandbox accounts
• CLI for app deployment and version management

Building Your First Custom App

Step 1: Set Up Development Environment

npm install -g @mondaycom/apps-cli
mapps init -t <YOUR_API_TOKEN>

Then scaffold a project with mapps app:scaffold and run npm install inside it.

Step 2: Build the UI

Create a React component that uses the monday.com SDK:

import React from 'react';
import mondaySdk from 'monday-sdk-js';

const monday = mondaySdk();

function MyBoardView() {
  const [boardData, setBoardData] = React.useState(null);

  React.useEffect(() => {
    monday.listen('context', (res) => {
      // Get current board ID from context
      const boardId = res.data.boardId;

      // Query board data via API
      monday.api(`query { boards(ids: ${boardId}) { items_page { items { name } } } }`)
        .then((res) => setBoardData(res.data));
    });
  }, []);

  return (
    <div>
      <h2>Custom Board View</h2>
      {/* Render your custom interface */}
    </div>
  );
}

Step 3: Configure App Manifest

Define your app’s features (for example a board view) and the OAuth scopes it needs, such as boards:read and boards:write, in the Developer Center. mapps manifest:export and mapps manifest:import move that configuration as a manifest file.

Step 4: Test Locally

npm start

Step 5: Deploy

npm run build
mapps code:push

Custom App Use Cases

1. External Data Visualization

Display data from external APIs inside monday.com boards.

Example: Financial services company built a board view that pulls real-time stock prices and portfolio performance data from their trading platform, displayed alongside project items tracking client accounts.

2. Specialized Workflow Interfaces

Create task-specific UIs that are optimized for specific workflows.

Example: Manufacturing company built an item view that shows a visual production timeline with photos at each stage, replacing monday.com’s standard item card with a custom inspection checklist interface.

3. Third-Party System Integration

Embed external tools directly inside monday.com.

Example: Marketing agency built a dashboard widget that displays Google Analytics data for client campaigns, eliminating the need to switch between platforms.

4. Approval Workflows

Build custom approval interfaces with multi-stage review processes.

Example: Legal team built an item view with a custom approval UI showing document version history, reviewer comments, and approval signatures — all in one place.

App Security & Permissions

When building custom apps, you request specific permission scopes during OAuth authorization:

Security best practices:

• Request only the minimum permissions your app needs
• Store API tokens securely (never in client-side code)
• Validate all user inputs before processing
• Implement rate limiting on your backend

Want to build a custom app for your team? Let’s talk about your requirements →

monday.com Marketplace: Publishing Public Apps

If you’ve built a custom app that solves a common problem, you can publish it to the monday.com app marketplace and make it available to all monday.com users — or monetize it as a commercial product.

Marketplace App Requirements

To publish an app in the marketplace, it must meet these criteria:

Marketplace Submission Process

1. Develop & Test

Build your app using the apps framework, test thoroughly with real users, gather feedback, and iterate.

2. Prepare Listing

Create marketing assets:

• App icon
• Screenshots showing key features
• Description (what it does, who it’s for, key benefits)
• Pricing model (free, freemium, paid tiers)
• Support resources (docs, video demos, contact info)

3. Submit for Review

Submit through the monday.com Developer Center. The review typically includes:

• Code review for security vulnerabilities
• UI/UX evaluation
• Performance testing
• Legal and compliance checks

4. Launch & Promote

Once approved:

• App goes live in the marketplace
• You can drive traffic through your own marketing channels
• App appears in search results when users look for integrations

Monetization Options

Example: CRM-to-Project Automation

Take a consulting firm that uses monday.com’s CRM to track leads and deals. When a deal closes, it needs an entire project structure:

• 9 boards (Kickoff, Discovery, Analysis, Strategy, Deliverables, Timeline, Budget, Resources, Client Communications)
• Pre-populated team members based on service type
• Cross-board automations linking related items
• Webhooks registered on each board for progress tracking

Done by hand, this setup is slow and easy to get wrong for every new client.

A custom integration on the monday.com API can:

• Monitor the CRM board for status changes to “Won”
• Duplicate template boards, rename them with the client name and create the folder structure
• Load team rosters based on service tier (pulled from a roster board)
• Register webhooks on all 9 boards (board automations need their own setup, because custom automations don’t carry over to duplicated boards)
• Send a Slack notification to the project manager when setup is complete

Result: Every new client gets the same project setup, with no missed boards or forgotten webhooks. For simpler cases, monday.com’s native Duplicate board and Create from template workflow blocks may be enough; see our guide to auto-duplicating template boards.

Integration Architecture Patterns

When building custom integrations, choosing the right architecture pattern is crucial for performance, scalability, and maintainability.

Pattern 1: Direct API Integration

Your application makes direct API calls to monday.com as needed.

Best for: Low-volume scripts, one-time data migrations, internal reporting tools.

Pattern 2: Webhook-Driven Event Processing

monday.com webhooks trigger actions in your system. Your backend processes events asynchronously.

Best for: Real-time sync between systems, event-driven workflows, high-volume automation.

Pattern 3: Hybrid (Polling + Webhooks)

Combine webhooks for real-time events with scheduled API polling for data reconciliation.

Best for: Mission-critical integrations, enterprise deployments, systems requiring audit trails.

Pattern 4: Middleware Platform

Use an integration platform like Zapier, Make, or custom middleware to orchestrate monday.com interactions.

Best for: Non-technical users, rapid prototyping, standard workflow automation.

Integration Development Best Practices

1. Error Handling & Retry Logic

Always implement graceful error handling:

async function createMondayItem(boardId, itemName) {
  const maxRetries = 3;
  let attempt = 0;

  while (attempt < maxRetries) {
    try {
      const response = await mondayAPI.createItem(boardId, itemName);
      return response;
    } catch (error) {
      attempt++;
      if (attempt === maxRetries) {
        // Log error, notify admin
        throw new Error(`Failed after ${maxRetries} attempts: ${error.message}`);
      }
      // Wait before retry (exponential backoff)
      await sleep(Math.pow(2, attempt) * 1000);
    }
  }
}

2. Rate Limit Management

3. Data Validation

Always validate data before sending to monday.com:

function validateColumnValues(columnValues) {
  const errors = [];

  // Check required fields
  if (!columnValues.status) {
    errors.push('Status is required');
  }

  // Validate date format
  if (columnValues.date && !isValidDate(columnValues.date)) {
    errors.push('Invalid date format');
  }

  // Validate email
  if (columnValues.email && !isValidEmail(columnValues.email)) {
    errors.push('Invalid email format');
  }

  return errors;
}

4. Logging & Monitoring

Log all integration activity for troubleshooting:

5. Testing Strategy

Test integrations thoroughly before production deployment:

Common Integration Challenges & Solutions

Challenge 1: Column Value Format Complexity

monday.com column values are stored as JSON strings with type-specific formats that vary by column type.

Solution: Create helper functions for each column type:

const columnHelpers = {
  status: (label) => JSON.stringify({ label }),
  date: (date) => JSON.stringify({ date }),
  people: (userIds) => JSON.stringify({ personsAndTeams: userIds.map((id) => ({ id, kind: 'person' })) }),
  numbers: (value) => JSON.stringify(value.toString()),
  text: (value) => JSON.stringify(value),
};

Challenge 2: Bulk Operation Performance

Creating thousands of items one-by-one is slow and hits rate limits.

Solution: Send several aliased create_item mutations per request, in batches sized to stay within the complexity budget.

Challenge 3: Keeping External Systems in Sync

Data can get out of sync if webhooks fail or external systems go offline.

Solution: Implement reconciliation jobs that run daily to compare monday.com data against external systems and fix discrepancies.

Challenge 4: Managing Multiple API Tokens

Different teams, environments, and apps require different API tokens.

Solution: Use environment variables and secrets management:

// .env file
// MONDAY_API_TOKEN_PROD=abc123...
// MONDAY_API_TOKEN_DEV=xyz789...

// In code
const apiToken = process.env.NODE_ENV === 'production'
  ? process.env.MONDAY_API_TOKEN_PROD
  : process.env.MONDAY_API_TOKEN_DEV;

Security Considerations

API Token Security

OAuth Best Practices

For marketplace apps using OAuth:

• Store refresh tokens encrypted
• Implement token expiration handling
• Request minimum necessary scopes
• Validate redirect URIs

Webhook Security

Verify webhook authenticity: answer monday.com’s challenge request when you create the webhook, and for webhooks created with an app token, verify the JWT in the Authorization header with your app’s Signing Secret (monday.com developer docs).

Data Privacy

When building integrations that handle sensitive data:

• Comply with GDPR, CCPA, and regional regulations
• Implement data encryption in transit and at rest
• Provide data deletion capabilities
• Document data handling in privacy policy

Alternative Solutions: When NOT to Build Custom

Sometimes a pre-built solution is faster and more cost-effective than custom development.

When to Use Pre-Built Tools

When Custom Development Makes Sense

BoardBridge is a middle ground for teams that need advanced form and workflow automation without full custom development. It handles forms that update existing items, AND/OR form logic, dual-board mapping and rich email automations out of the box — no coding required.

Explore how BoardBridge compares to custom development for your use case →

Tools & Resources for Integration Development

Official monday.com Resources

Third-Party Tools

Development Languages & SDKs

monday.com provides official SDKs for:

• JavaScript (monday-sdk-js, for apps and the API)
• Python

Both handle GraphQL query execution and authentication.

Frequently Asked Questions