API Reference

Complete API documentation for MikroMeet’s HTTP REST endpoints and WebSocket signaling protocol.

Base URL

• Local testing: http://127.0.0.1:3000
• Production: https://yourdomain.com

HTTP Endpoints

Health Check

Check server health and statistics.

GET /health

Response (200 OK):

{
  "status": "ok",
  "totalRooms": 5,
  "totalParticipants": 12,
  "peakParticipants": 24,
  "uptime": 3600000,
  "version": "1.0.0"
}

Fields:

• status - Server status ("ok")
• totalRooms - Current active rooms
• totalParticipants - Current connected participants
• peakParticipants - Peak participants since server start
• uptime - Server uptime in milliseconds
• version - MikroMeet version

Configuration

Get ICE server configuration for WebRTC.

GET /config

Response (200 OK):

{
  "iceServers": [
    { "urls": "stun:stun.cloudflare.com:3478" },
    {
      "urls": "turn:turn.yourdomain.com:3478",
      "username": "mikromeet",
      "credential": "password"
    }
  ]
}

Fields:

• iceServers - Array of STUN/TURN server configurations

Create Room

Pre-create a room with optional password.

POST /api/rooms
Content-Type: application/json

{
  "roomId": "ABC123",
  "password": "secret",
  "maxParticipants": 8,
  "title": "Roadmap sync",
  "scheduledStart": 1777550400000,
  "scheduledEnd": 1777552200000
}

Request Body (all fields optional):

• roomId - Custom room ID (6 alphanumeric characters)
• password - Room password for entry
• maxParticipants - Maximum participants (default: 8)
• title - Optional meeting title
• scheduledStart - Optional start time as a Unix timestamp in milliseconds
• scheduledEnd - Optional end time as a Unix timestamp in milliseconds

Response (201 Created):

{
  "roomId": "ABC123",
  "creatorToken": "550e8400-e29b-41d4-a716-446655440000",
  "title": "Roadmap sync",
  "scheduledStart": 1777550400000,
  "scheduledEnd": 1777552200000
}

Fields:

• roomId - The created room ID
• creatorToken - Token for creator privileges
• title - Meeting title, when provided
• scheduledStart - Scheduled start time, when provided
• scheduledEnd - Scheduled end time, when provided

Error Responses:

429 Too Many Requests (rate limit exceeded):

{
  "error": "Too many requests. Please try again later."
}

429 Too Many Requests (room limit reached):

{
  "error": "Cannot create room. Limit reached or room ID already exists."
}

400 Bad Request (invalid request):

{
  "error": "Invalid request body"
}

WebSocket API

Connect to WebSocket endpoint for signaling.

Connection

const ws = new WebSocket('wss://yourdomain.com/ws');

Endpoint: /ws

Message Format

All messages are JSON with this base structure:

{
  "type": "message-type",
  "roomId": "ABC123",
  "participantId": "participant-uuid",
  "timestamp": 1234567890
}

Client → Server Messages

Messages sent from client to server.

Join Room

Join or create a meeting room.

{
  "type": "join",
  "roomId": "ABC123",
  "participantId": "",
  "name": "John Doe",
  "password": "secret",
  "isHost": false,
  "creatorToken": "550e8400-e29b-41d4-a716-446655440000",
  "timestamp": 1234567890
}

Fields:

• name - Participant’s display name
• password - Room password (if required)
• isHost - True if creating new room
• creatorToken - Creator token from /api/rooms (optional)

Response: Server sends participant-joined message.

Leave Room

Leave the current room.

{
  "type": "leave",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "timestamp": 1234567890
}

WebRTC Offer

Send WebRTC offer to peer.

{
  "type": "offer",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "targetId": "peer-uuid",
  "sdp": "v=0\r\no=- ...",
  "timestamp": 1234567890
}

Fields:

• targetId - Recipient participant ID
• sdp - WebRTC SDP offer

WebRTC Answer

Send WebRTC answer to peer.

{
  "type": "answer",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "targetId": "peer-uuid",
  "sdp": "v=0\r\no=- ...",
  "timestamp": 1234567890
}

Fields:

• targetId - Recipient participant ID
• sdp - WebRTC SDP answer

ICE Candidate

Send ICE candidate to peer.

{
  "type": "ice-candidate",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "targetId": "peer-uuid",
  "candidate": {
    "candidate": "candidate:...",
    "sdpMid": "0",
    "sdpMLineIndex": 0
  },
  "timestamp": 1234567890
}

Fields:

• targetId - Recipient participant ID
• candidate - ICE candidate object

Chat Message

Send text message to room.

{
  "type": "chat",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "text": "Hello everyone!",
  "replyTo": "message-id",
  "timestamp": 1234567890
}

Fields:

• text - Message text
• replyTo - ID of message being replied to (optional)

File Offer

Offer a file transfer to another participant.

{
  "type": "file-offer",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "targetId": "peer-uuid",
  "transferId": "transfer-uuid",
  "fileName": "notes.pdf",
  "fileSize": 245760,
  "fileType": "application/pdf",
  "timestamp": 1234567890
}

Fields:

• targetId - Recipient participant ID
• transferId - Stable ID for this transfer
• fileName - Original file name
• fileSize - File size in bytes
• fileType - Browser-provided MIME type

File Answer

Accept or reject an offered file transfer.

{
  "type": "file-answer",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "targetId": "sender-uuid",
  "transferId": "transfer-uuid",
  "accepted": true,
  "timestamp": 1234567890
}

File Chunk

Send one encoded file chunk to the recipient.

{
  "type": "file-chunk",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "targetId": "peer-uuid",
  "transferId": "transfer-uuid",
  "chunk": "base64-encoded-data",
  "index": 0,
  "total": 12,
  "timestamp": 1234567890
}

Update Participant State

Update own audio/video state.

{
  "type": "participant-updated",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "isMuted": true,
  "isVideoOff": false,
  "isHandRaised": false,
  "timestamp": 1234567890
}

Fields:

• isMuted - Audio muted state
• isVideoOff - Video disabled state
• isHandRaised - Hand raised state

Raise Hand

Raise hand for attention.

{
  "type": "raise-hand",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "timestamp": 1234567890
}

Lower Hand

Lower raised hand.

{
  "type": "lower-hand",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "timestamp": 1234567890
}

Recording Started

Notify the room that a moderator started local recording.

{
  "type": "recording-started",
  "roomId": "ABC123",
  "participantId": "moderator-uuid",
  "startedBy": "moderator-uuid",
  "timestamp": 1234567890
}

Recording Stopped

Notify the room that moderator recording stopped.

{
  "type": "recording-stopped",
  "roomId": "ABC123",
  "participantId": "moderator-uuid",
  "stoppedBy": "moderator-uuid",
  "timestamp": 1234567890
}

Reaction

Send a short visual reaction to other room participants.

{
  "type": "reaction",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "reaction": "thumb",
  "timestamp": 1234567890
}

Fields:

• reaction - Reaction id to display. Built-in ids are thumb, clap, party, heart, and laugh.

Moderator Actions

Perform moderator actions (requires moderator privilege).

{
  "type": "moderator-action",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "targetId": "target-uuid",
  "action": "mute",
  "timestamp": 1234567890
}

Actions:

• mute - Mute participant
• unmute - Unmute participant
• kick - Remove participant from room
• make-moderator - Grant moderator privileges

Lock Room

Lock room to require moderator approval (moderator only).

{
  "type": "room-locked",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "timestamp": 1234567890
}

Unlock Room

Unlock room (moderator only).

{
  "type": "room-unlocked",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "timestamp": 1234567890
}

Admit User

Admit user from waiting room (moderator only).

{
  "type": "admit-user",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "targetId": "waiting-user-uuid",
  "timestamp": 1234567890
}

Reject User

Reject user from waiting room (moderator only).

{
  "type": "reject-user",
  "roomId": "ABC123",
  "participantId": "your-uuid",
  "targetId": "waiting-user-uuid",
  "reason": "Room is full",
  "timestamp": 1234567890
}

Server → Client Messages

Messages sent from server to client.

Participant Joined

New participant joined the room.

{
  "type": "participant-joined",
  "roomId": "ABC123",
  "participantId": "new-participant-uuid",
  "name": "Jane Doe",
  "isModerator": false,
  "isMuted": false,
  "isVideoOff": false,
  "timestamp": 1234567890
}

Fields:

• participantId - New participant’s ID
• name - Participant’s display name
• isModerator - Moderator status
• isMuted - Audio state
• isVideoOff - Video state

Participant Left

Participant left the room.

{
  "type": "participant-left",
  "roomId": "ABC123",
  "participantId": "departed-uuid",
  "timestamp": 1234567890
}

Participant Updated

Participant’s state changed.

{
  "type": "participant-updated",
  "roomId": "ABC123",
  "participantId": "participant-uuid",
  "isModerator": false,
  "isMuted": true,
  "isVideoOff": false,
  "isHandRaised": false,
  "timestamp": 1234567890
}

Waiting Room

User is in waiting room or new user waiting.

{
  "type": "waiting-room",
  "roomId": "ABC123",
  "participantId": "waiting-uuid",
  "name": "Waiting User",
  "timestamp": 1234567890
}

Error

Server error message.

{
  "type": "error",
  "roomId": "",
  "participantId": "",
  "message": "Room is full",
  "code": "ROOM_FULL",
  "timestamp": 1234567890
}

Error Codes:

• ROOM_FULL - Room has reached max participants
• INVALID_PASSWORD - Incorrect room password
• ROOM_NOT_FOUND - Meeting doesn’t exist
• UNAUTHORIZED - Action requires moderator privileges
• NOT_JOINED - Action requires joining a room first
• TARGET_NOT_FOUND - Target participant does not exist in the room
• INVALID_MESSAGE - Message could not be parsed
• UNKNOWN_MESSAGE_TYPE - Message type is not supported

Rate Limiting

Rate limits per IP address:

• WebSocket connections: 10 per minute
• Room creation: 10 per minute

Response on limit exceeded:

• WebSocket: Connection closed
• HTTP: 429 status code

CORS

MikroMeet allows cross-origin requests:

Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET, POST, OPTIONS
Access-Control-Allow-Headers: Content-Type

For production, configure specific origins in reverse proxy.

Security Headers

MikroMeet includes security headers:

X-Content-Type-Options: nosniff
X-Frame-Options: DENY
X-XSS-Protection: 1; mode=block
Referrer-Policy: strict-origin-when-cross-origin

Example Client Implementation

JavaScript/TypeScript

// Connect to WebSocket
const ws = new WebSocket('wss://yourdomain.com/ws');

// Join room
ws.send(JSON.stringify({
  type: 'join',
  roomId: 'ABC123',
  participantId: '',
  name: 'John Doe',
  timestamp: Date.now()
}));

// Handle messages
ws.onmessage = (event) => {
  const message = JSON.parse(event.data);

  switch (message.type) {
    case 'participant-joined':
      console.log(`${message.name} joined`);
      break;
    case 'chat':
      console.log(`${message.participantId}: ${message.text}`);
      break;
    case 'error':
      console.error(message.message);
      break;
  }
};

// Send chat
ws.send(JSON.stringify({
  type: 'chat',
  roomId: 'ABC123',
  participantId: 'your-uuid',
  text: 'Hello!',
  timestamp: Date.now()
}));

Next Steps

• Server Options - Configuration reference
• Configuration Guide - Setup instructions