/telnyx-messaging-hosted-javascript

name: telnyx-messaging-hosted-javascript
description: >-
  Set up hosted SMS numbers, toll-free verification, and RCS messaging. Use when
  migrating numbers or enabling rich messaging features. This skill provides
  JavaScript SDK examples.
metadata:
  author: telnyx
  product: messaging-hosted
  language: javascript
  generated_by: telnyx-openapi-pipeline

<!-- Auto-generated from Telnyx OpenAPI specs. Do not edit. -->

Telnyx Messaging Hosted - JavaScript

Installation

npm install telnyx@6.74.2

Setup

import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
  publicKey: process.env['TELNYX_PUBLIC_KEY'], // Required for client.webhooks.unwrap() (webhook verification)
});

All examples below assume `client` is already initialized as shown above.

Error Handling

All API calls can fail with network errors, rate limits (429), validation errors (422), or authentication errors (401). Always handle errors in production code:

try {
  const result = await client.messages.send({ to: '+13125550001', from: '+13125550002', text: 'Hello' });
} catch (err) {
  if (err instanceof Telnyx.APIConnectionError) {
    console.error('Network error — check connectivity and retry');
  } else if (err instanceof Telnyx.RateLimitError) {
    // 429: rate limited — wait, then retry the request (bounded exponential backoff)
    const retryAfter = err.headers?.['retry-after'] || 1;
    await new Promise(r => setTimeout(r, retryAfter * 1000));
    // ...retry the call here (give up after a few attempts)
  } else if (err instanceof Telnyx.APIError) {
    console.error(`API error ${err.status}: ${err.message}`);
    if (err.status === 422) {
      console.error('Validation error — check required fields and formats');
    }
  }
  throw err; // Re-throw: a failed request must never look like success to the caller
}

Common error codes: `401` invalid API key, `403` insufficient permissions, `404` resource not found, `422` validation error (check field formats), `429` rate limited (retry with exponential backoff).

Important Notes

• **Phone numbers** must be in E.164 format (e.g., `+13125550001`). Include the `+` prefix and country code. No spaces, dashes, or parentheses.
• **Pagination:** List methods return an auto-paginating iterator. Use `for await (const item of result) { ... }` to iterate through all pages automatically.

Send an RCS message

Queues an outbound RCS message through the selected RCS agent. Check recipient capabilities before sending features that require RCS support.

`POST /messages/rcs` — Required: `agent_id`, `to`, `messaging_profile_id`, `agent_message`

Optional: `mms_fallback` (object), `sms_fallback` (object), `type` (enum: RCS), `webhook_url` (url)

const response = await client.messages.rcs.send({
  agent_id: 'Agent007',
  agent_message: {},
  messaging_profile_id: '550e8400-e29b-41d4-a716-446655440000',
  to: '+13125551234',
});

console.log(response.data);

Returns: `body` (object), `direction` (string), `encoding` (string), `from` (object), `id` (string), `messaging_profile_id` (string), `organization_id` (string), `received_at` (date-time), `record_type` (string), `to` (array[object]), `type` (string), `wait_seconds` (float)

Generate RCS deeplink

Generate a deeplink URL that can be used to start an RCS conversation with a specific agent.

`GET /messages/rcs/deeplinks/{agent_id}`

const response = await client.messages.rcs.generateDeeplink('agent_id');

console.log(response.data);

Returns: `url` (string)

List all RCS agents

Returns RCS agents available to the authenticated account.

`GET /messaging/rcs/agents`

// Automatically fetches more pages as needed.
for await (const rcsAgent of client.messaging.rcs.agents.list()) {
  console.log(rcsAgent.agent_id);
}

Returns: `agent_id` (string), `agent_name` (string), `created_at` (date-time), `enabled` (boolean), `profile_id` (uuid), `updated_at` (date-time), `user_id` (string), `webhook_failover_url` (url), `webhook_url` (url)

Retrieve an RCS agent

Returns the configuration and current state of the specified RCS agent.

`GET /messaging/rcs/agents/{id}`

const rcsAgentResponse = await client.messaging.rcs.agents.retrieve('550e8400-e29b-41d4-a716-446655440000');

console.log(rcsAgentResponse.data);

Returns: `agent_id` (string), `agent_name` (string), `created_at` (date-time), `enabled` (boolean), `profile_id` (uuid), `updated_at` (date-time), `user_id` (string), `webhook_failover_url` (url), `webhook_url` (url)

Modify an RCS agent

Updates the supplied configuration fields on the specified RCS agent.

`PATCH /messaging/rcs/agents/{id}`

Optional: `profile_id` (uuid), `webhook_failover_url` (url), `webhook_url` (url)

const rcsAgentResponse = await client.messaging.rcs.agents.update('550e8400-e29b-41d4-a716-446655440000');

console.log(rcsAgentResponse.data);

Returns: `agent_id` (string), `agent_name` (string), `created_at` (date-time), `enabled` (boolean), `profile_id` (uuid), `updated_at` (date-time), `user_id` (string), `webhook_failover_url` (url), `webhook_url` (url)

Check RCS capabilities (batch)

Returns RCS capability information for multiple recipients in one request.

`POST /messaging/rcs/bulk_capabilities` — Required: `agent_id`, `phone_numbers`

const response = await client.messaging.rcs.listBulkCapabilities({
  agent_id: 'TestAgent',
  phone_numbers: ['+13125551234'],
});

console.log(response.data);

Returns: `agent_id` (string), `agent_name` (string), `features` (array[string]), `phone_number` (string), `record_type` (enum: rcs.capabilities)

Check RCS capabilities

Returns the RCS features supported by the specified recipient for the selected agent.

`GET /messaging/rcs/capabilities/{agent_id}/{phone_number}`

const response