> ## Documentation Index
> Fetch the complete documentation index at: https://developers.phrase.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Authentication

## Phrase Platform API tokens

The Phrase Studio API uses API key authentication. Generate a Phrase Platform JWT token as described [here](/en/api/platform/authentication)

### Using Your API Key

Include your API key in the `X-API-Key` header with every API request:

```bash theme={null}
curl -X GET "https://api.studio.us.phrase.com/v1/projects" \
  -H "X-API-Key: YOUR_API_KEY"
```

### Common Authentication Errors

| Status Code      | Description                                                        |
| ---------------- | ------------------------------------------------------------------ |
| 401 Unauthorized | Invalid or missing API key                                         |
| 403 Forbidden    | API key is valid but doesn't have access to the requested resource |