telnyx-messaging-javascript

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

# Telnyx Messaging - JavaScript

## Installation

```bash
npm install telnyx
```

## Setup

```javascript
import Telnyx from 'telnyx';

const client = new Telnyx({
  apiKey: process.env['TELNYX_API_KEY'], // This is the default and can be omitted
});
```

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:

```javascript
try {
  const response = await client.messages.send({
      to: '+18445550001',
      from: '+18005550101',
      text: 'Hello from Telnyx!',
  });
} catch (err) {
  if (err instanceof Telnyx.APIConnectionError) {
    console.error('Network error — check connectivity and retry');
  } else if (err instanceof Telnyx.RateLimitError) {
    const retryAfter = err.headers?.['retry-after'] || 1;
    await new Promise(r => setTimeout(r, retryAfter * 1000));
  } 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');
    }
  }
}
```

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.

## Operational Caveats

- The sending number must already be assigned to the correct messaging profile before you send traffic from it.
- US A2P long-code traffic must complete 10DLC registration before production sending or carriers will block or heavily filter messages.
- Delivery webhooks are asynchronous. Treat the send response as acceptance of the request, not final carrier delivery.

## Reference Use Rules

Do not invent Telnyx parameters, enums, response fields, or webhook fields.

- If the parameter, enum, or response field you need is not shown inline in this skill, read [references/api-details.md](references/api-details.md) before writing code.
- Before using any operation in `## Additional Operations`, read [the optional-parameters section](references/api-details.md#optional-parameters) and [the response-schemas section](references/api-details.md#response-schemas).
- Before reading or matching webhook fields beyond the inline examples, read [the webhook payload reference](references/api-details.md#webhook-payload-fields).

## Core Tasks

### Send an SMS

Primary outbound messaging flow. Agents need exact request fields and delivery-related response fields.

`client.messages.send()` — `POST /messages`

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| `to` | string (E.164) | Yes | Receiving address (+E.164 formatted phone number or short co... |
| `from` | string (E.164) | Yes | Sending address (+E.164 formatted phone number, alphanumeric... |
| `text` | string | Yes | Message body (i.e., content) as a non-empty string. |
| `messagingProfileId` | string (UUID) | No | Unique identifier for a messaging profile. |
| `mediaUrls` | array[string] | No | A list of media URLs. |
| `webhookUrl` | string (URL) | No | The URL where webhooks related to this message will be sent. |
| ... | | | +7 optional params in [references/api-details.md](references/api-details.md) |

```javascript
const response = await client.messages.send({
    to: '+18445550001',
    from: '+18005550101',
    text: 'Hello from Telnyx!',
});

console.log(response.data);
```

Primary response fields:
- `response.data.id`
- `response.data.to`
- `response.data.from`
- `response.data.text`
- `response.data.sentAt`
- `response.data.errors`

### Send an SMS with an alphanumeric sender ID

Common sender variant that requires different request shape.

`client.messages.sendWithAlphanumericSender()` — `POST /messages/alphanumeric_sender_id`

| Parameter | Type | Required | Description |
|-----------|------|----------|-------------|
| `from` | string (E.164) | Yes | A valid alphanumeric sender ID on the user's account. |
| `to` | string (E.164) | Yes | Receiving address (+E.164 formatted phone number or short co... |
| `text` | string | Yes | The message body. |
| `messagingProfileId` | string (UUID) | Yes | The messaging profile ID to use. |
| `webhookUrl` | string (URL) | No | Callback URL for delivery status updates. |
| `webhookFailoverUrl` | string (URL) | No | Failover callback URL for delivery status updates. |
| `useProfileWebhooks` | boolean | No | If true, use the messaging profile's webhook settings. |

```javascript
const response = await client.messages.sendWithAlphanumericSender({
  from: 'MyCompany',
  messaging_profile_id: '182bd5e5-6e1a-4fe4-a799-aa6d9a6ab26e',
  text: 'Hello from Telnyx!',
  to: '+13125550001',
});

console.log(response.data);
```

Primary response fields:
- `response.data.id`
- `response.data.to`
- `response.data.from`
- `response.data.text`
- `response.data.sentAt`
- `response.data.errors`

---

### Webhook Verification

Telnyx signs webhooks with Ed25519. Each request includes `telnyx-signature-ed25519`
and `telnyx-timestamp` headers. Always verify signatures in production:

```javascript
// In your webhook handler (e.g., Express — use raw body, not parsed JSON):
app.post('/webhooks', express.raw({ type: 'application/json' }), async (req, res) => {
  try {
    const event = await client.webhooks.unwrap(req.body.toString(), {
      headers: req.headers,
    });
    // Signature valid — event is the parsed webhook payload
    console.log('Received event:', event.data.event_type);