# How to undertake bubble plugin creation for niche functionalities in Bubble.io: 

- Tool: Bubble
- Difficulty: Beginner
- Time required: 30-40 min
- Compatibility: All Bubble plans
- Last updated: March 2026

## TL;DR

Creating custom Bubble plugins lets you add niche functionality not available in the marketplace. This tutorial covers the Plugin Editor structure, creating custom elements and actions with JavaScript, defining API connections, testing your plugin, and publishing it to the Bubble marketplace for other builders to use.

## Overview: Creating Bubble Plugins for Niche Functionality

When the Bubble marketplace does not have what you need, you can build it yourself. Bubble's Plugin Editor lets you create custom elements, workflow actions, and API integrations using JavaScript. This tutorial walks through the plugin creation process from setup through marketplace publishing.

## Before you start

- A Bubble account
- Basic JavaScript knowledge (variables, functions, DOM manipulation)
- Understanding of how Bubble plugins work from a user perspective
- A clear idea of the functionality you want to create

## Step-by-step guide

### 1. Access the Plugin Editor and create a new plugin

Go to bubble.io/home and click the Plugins tab in the top navigation (or go to bubble.io/home/plugins). Click 'Create a new plugin'. Enter a name, description, and category for your plugin. The Plugin Editor opens with seven tabs: General (metadata), Shared (shared HTML/CSS/JS assets), API calls (external API integrations), Elements (custom UI elements), Actions (custom workflow actions), Settings/Version (publishing), and Review (marketplace review status).

**Expected result:** A new plugin created in the Plugin Editor with all seven tabs accessible.

### 2. Create a custom element with JavaScript

Click the Elements tab and click 'Add a new element'. Name it (like 'Color Picker' or 'Signature Pad'). Define the element's properties: add fields that users can configure (like default_color, width, height). In the Code section, write the JavaScript that creates your element. The code has access to instance.data for reading properties and instance.publishState() for sending data back to Bubble. Use the initialize function to create your HTML, the update function to respond to property changes, and instance.canvas for the DOM container.

```
// Example: Simple counter element
function(instance, properties, context) {
    // Initialize
    var count = 0;
    var div = document.createElement('div');
    div.innerHTML = '<span id="count">0</span> <button id="inc">+</button>';
    instance.canvas.append(div);
    
    div.querySelector('#inc').addEventListener('click', function() {
        count++;
        div.querySelector('#count').textContent = count;
        instance.publishState('current_count', count);
        instance.triggerEvent('count_changed');
    });
}
```

**Expected result:** A custom element that renders in the Bubble editor and responds to user interaction.

### 3. Create a custom workflow action

Click the Actions tab and click 'Add a new action'. Name it (like 'Format Phone Number' or 'Generate UUID'). Define input fields (parameters the user sets in the workflow) and return values (data the action sends back). In the Code section, write JavaScript that processes the inputs and returns values. Use properties.[field_name] to read inputs and instance.publishState() or the return mechanism to send results back. Actions run synchronously unless you use asynchronous patterns with instance.setProgressCompletable().

**Expected result:** A custom workflow action that users can add to any workflow with configurable inputs and outputs.

### 4. Add API calls to your plugin

Click the API calls tab to add external API integrations to your plugin. This works similarly to the standard API Connector but packages the API configuration into your plugin. Define authentication, endpoints, and parameters. Users configure their own API keys in the plugin settings. This is useful when your plugin wraps a specific third-party service (like a specific SMS provider or analytics tool). The API calls appear as either Data sources or Actions depending on your configuration.

**Expected result:** API integrations packaged within your plugin for easy user configuration.

### 5. Test your plugin in a Bubble app

To test, install your plugin in a test Bubble app. Go to the app's Plugins tab, search for your plugin (it appears in your private plugins), and install it. Test custom elements by dragging them onto a page and configuring properties. Test actions by adding them to workflows. Test API calls by initializing them with real credentials. Check for errors in the browser console (right-click → Inspect → Console). Make changes in the Plugin Editor and refresh the test app to see updates.

> Pro tip: Use console.log() in your plugin code during development to debug — check the browser console for output.

**Expected result:** Your plugin works correctly in a test app with all elements, actions, and API calls functioning as expected.

### 6. Publish your plugin to the marketplace

When testing is complete, go to the Settings/Version tab in the Plugin Editor. Write a clear description of what your plugin does, add screenshots showing the element or action in use, set the pricing (free, one-time, or subscription), and choose whether to make the plugin open-source (MIT license — code visible, irreversible) or private. Click 'Submit for review'. Bubble's team reviews the plugin for quality and security. Once approved, it appears in the marketplace for all Bubble users to install.

**Expected result:** Your plugin is submitted for review and, once approved, available in the Bubble plugin marketplace.

## Complete code example

File: `Workflow summary`

```text
PLUGIN CREATION SUMMARY
========================

PLUGIN EDITOR TABS:
  General: name, description, icon, category
  Shared: HTML/CSS/JS assets loaded on all pages
  API calls: external API integrations
  Elements: custom UI elements (requires JavaScript)
  Actions: custom workflow actions (requires JavaScript)
  Settings/Version: publishing, pricing, version management
  Review: marketplace review status

CUSTOM ELEMENT STRUCTURE:
  Properties: user-configurable fields
    (text, number, yes/no, color, data source)
  States: data published back to Bubble
    instance.publishState('state_name', value)
  Events: triggers for Bubble workflows
    instance.triggerEvent('event_name')
  Code functions:
    initialize: create DOM elements in instance.canvas
    update: respond to property changes

CUSTOM ACTION STRUCTURE:
  Fields: input parameters from user
  Return values: data sent back to workflow
  Code: process inputs → return results
    Access inputs: properties.field_name
    Return: via publishState or return mechanism

TESTING:
  1. Install plugin in test app
  2. Add elements to page / actions to workflows
  3. Check browser console for errors
  4. Refresh test app after Plugin Editor changes

PUBLISHING:
  Settings/Version tab:
    Description + screenshots
    Pricing: free / one-time / subscription
    License: open-source (MIT) or private
    Submit for review → Bubble team approval
```

## Common mistakes

- **Not using instance.publishState to send data back to Bubble** — Without publishing state, Bubble cannot read any data from your custom element — it remains a black box Fix: Use instance.publishState('state_name', value) to expose element data that Bubble workflows and expressions can access
- **Making a plugin open-source without understanding it is irreversible** — Once a plugin is set to MIT open-source license, the code becomes permanently visible and you cannot make it private again Fix: Only choose open-source if you intentionally want others to see and fork your plugin code
- **Not testing across different Bubble plans and browsers** — Plugin behavior can vary based on the user's plan (affecting available features) and browser (affecting JavaScript compatibility) Fix: Test your plugin on at least the free and paid plans, and in Chrome, Firefox, and Safari before publishing

## Best practices

- Use console.log during development for debugging, remove before publishing
- Expose all useful element data via publishState for Bubble expression access
- Add clear documentation in your plugin description with setup instructions
- Test in multiple browsers before publishing
- Version your plugin releases with clear changelogs
- Keep shared assets minimal — they load on every page regardless of plugin usage

## Frequently asked questions

### Do I need to know JavaScript to create Bubble plugins?

Yes, for custom elements and actions. JavaScript is required for the code that runs your plugin's logic. For API-only plugins (wrapping external APIs), minimal JavaScript is needed.

### Can I charge for my Bubble plugin?

Yes. You can set one-time or subscription pricing in the Settings/Version tab. Bubble handles the marketplace billing.

### How long does the review process take?

Plugin reviews typically take 1-5 business days. Bubble checks for functionality, security, and quality before approving marketplace listings.

### Can I update my plugin after publishing?

Yes. Make changes in the Plugin Editor and submit a new version. Updates are automatically available to all users who installed the plugin.

### Do plugin users get my source code?

Only if you choose the open-source (MIT) license. Private plugins keep the code hidden from users.

### Can RapidDev help create custom Bubble plugins?

Yes. RapidDev can develop custom Bubble plugins including complex UI elements, workflow actions, and API integrations tailored to your specific needs.

---

Source: https://www.rapidevelopers.com/bubble-tutorial/undertake-bubble-plugin-creation-niche-functionalities
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