n8n Community Node — Openwa (WhatsApp API)

This repository provides an n8n community node that integrates with the Openwa (wa-automate) WhatsApp API.

how to install it into self hosted N8N

Small overview

• Purpose: let n8n users send messages and manage chats, groups, contacts, statuses and webhooks via an Openwa instance.
• Credentials: the node uses a simple base URL + API key header authentication (the credential expects a Base URL and an apiKey which is sent as the api_key header).
• Request envelope: the Openwa API endpoints used by this node expect POST bodies wrapped in an args envelope (for example: { "args": { ... } }).

Included resources and operations

• Message: send text, media, reply, edit, react, get info, delete
• Chat: list chats, get chat info, archive/unarchive, mute/unmute, pin/unpin, clear, delete, mark all read
• Group: create group, add/remove/promote/demote participants, set title/description, leave group
• Contact: list contacts, get contact, block/unblock, check number status, business profile
• Status: post text/image/video statuses, list my statuses, delete status
• Webhook: register, list, update, remove webhooks

Quick links

• Openwa (official documentation):
• Open-wa GitHub (wa-automate-nodejs)

How to use

1. Install the node package into your n8n instance (or run n8n with this package linked during development).
2. Create new credentials of type "Openwa API" and set:
   • API Base URL — the base URL of your Openwa server (for example http://domain.com:8080).
   • API Key — the API key set on your Openwa server.
3. Add the node to your workflow and choose a Resource + Operation.
4. For POST operations, provide the operation fields — the node will wrap payloads into the required { args: { ... } } envelope automatically.

Notes and troubleshooting

• If an endpoint fails, enable verbose logging on your Openwa server and compare the request payload. The node maps common field names to the API's required keys (e.g. chatId -> to, message content field used as required by the API).
• Verify the api_key header name matches your server's configuration.

How to Add a New API in the Future

Here's a step-by-step guide to add a new endpoint. We'll use sendLocation as an example:

Step 1: Add the operation to the options list

In nodes/Openwa/operations/Message.ts (or the relevant resource file), find the options array and add your operation in alphabetical order:

{
  name: 'Send Location',
  value: 'sendLocation',
  description: 'Send a location message',
  action: 'Send location',
},

Step 2: Add input fields

Add field definitions right below the operation options:

{
  displayName: 'Chat ID',
  name: 'chatId',
  type: 'string',
  default: '',
  displayOptions: {
    show: {
      resource: ['message'],
      operation: ['sendLocation'],
    },
  },
  description: 'The chat to send the location to',
  placeholder: 'chat_id@c.us',
},
{
  displayName: 'Latitude',
  name: 'latitude',
  type: 'number',
  default: 0,
  displayOptions: {
    show: {
      resource: ['message'],
      operation: ['sendLocation'],
    },
  },
  description: 'Latitude coordinate',
},
{
  displayName: 'Longitude',
  name: 'longitude',
  type: 'number',
  default: 0,
  displayOptions: {
    show: {
      resource: ['message'],
      operation: ['sendLocation'],
    },
  },
  description: 'Longitude coordinate',
},

Key points:

• displayOptions.show.operation: ['sendLocation'] = field only appears when user selects that operation
• type options: 'string', 'number', 'boolean', 'options' (dropdown), 'json', etc.
• Set default to a sensible empty value
• Add placeholder to guide users

Step 3: Add the switch case in the handler function

In the operation handler (e.g., messageOperations), add a new case:

case 'sendLocation': {
  const chatId = this.getNodeParameter('chatId', itemIndex) as string;
  const latitude = this.getNodeParameter('latitude', itemIndex) as number;
  const longitude = this.getNodeParameter('longitude', itemIndex) as number;

  const response = await openwaApiRequest.call(this, 'POST', '/sendLocation', {
    to: chatId,  // Map 'chatId' to 'to' (as required by API)
    latitude,
    longitude,
  });

  return response;
}

Important:

• Always wrap POST body as { args: { ... } } (Openwa API contract)
• Use this.getNodeParameter('<fieldName>', itemIndex) to get user input
• Map internal field names to API keys if different (e.g., chatId → to, messageText → content)

Step 4: Test locally

npm run build
npm run lint

---

Field Types Reference

Type	Usage	Example
'string'	Text input	Chat ID, message text, URLs
'number'	Numeric input	Latitude, longitude, timeout
'boolean'	Toggle on/off	Mute, archive flags
'options'	Dropdown menu	Choose from preset values
'json'	Raw JSON editor	Complex data structures
'dateTime'	Date/time picker	Timestamps

For dropdown fields with preset values, use 'options' type with an options array:

{
  displayName: 'Status Type',
  name: 'statusType',
  type: 'options',
  options: [
    { name: 'Text', value: 'text' },
    { name: 'Image', value: 'image' },
    { name: 'Video', value: 'video' },
  ],
  default: 'text',
}

---

File Structure

nodes/Openwa/operations/
├── Message.ts      ← send/manage messages
├── Chat.ts         ← chat operations
├── Group.ts        ← group operations
├── Contact.ts      ← contact operations
├── Status.ts       ← status and snapshot operations
├── Webhook.ts      ← webhook operations
└── ../transport/ApiRequest.ts ← centralized API request helper

Each file exports:

• export const <resource>Fields: INodeProperties[] — all input fields
• export async function <resource>Operations(...) — handler with switch cases

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Contributing

• Contributions and improvements welcome — open PRs to this repository.

License

• See package.json for license information.