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

# Typescript SDK

> Models API Typescript SDK v0.1.0

<Note>**v0.1.0** | [GitHub](https://github.com/dedalus-labs/dedalus-sdk-typescript) | [Changelog](https://github.com/dedalus-labs/dedalus-sdk-typescript/blob/main/CHANGELOG.md)</Note>

## Installation

<Tabs>
  <Tab title="npm">
    ```bash theme={"theme":{"light":"github-light","dark":"github-dark"}}
    npm install dedalus-labs
    ```
  </Tab>

  <Tab title="pnpm">
    ```bash theme={"theme":{"light":"github-light","dark":"github-dark"}}
    pnpm add dedalus-labs
    ```
  </Tab>

  <Tab title="yarn">
    ```bash theme={"theme":{"light":"github-light","dark":"github-dark"}}
    yarn add dedalus-labs
    ```
  </Tab>

  <Tab title="bun">
    ```bash theme={"theme":{"light":"github-light","dark":"github-dark"}}
    bun add dedalus-labs
    ```
  </Tab>
</Tabs>

## Usage

<Tip>See the full method reference in the [API Reference](/api-reference/dcs) tab.</Tip>

The full API of this library can be found in [api.md](api.md).

```js theme={"theme":{"light":"github-light","dark":"github-dark"}}
import Dedalus from 'dedalus-labs';

const client = new Dedalus({
  apiKey: process.env['DEDALUS_API_KEY'], // This is the default and can be omitted
  environment: 'development', // defaults to 'production'
});

const completion = await client.chat.completions.create({
  model: 'openai/gpt-5-nano',
  messages: [
    { role: 'system', content: 'You are Stephen Dedalus. Respond in morose Joycean malaise.' },
    { role: 'user', content: 'Hello, how are you today?' },
  ],
});

console.log(completion.id);
```

## Streaming

We provide support for streaming responses using Server Sent Events (SSE).

```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
import Dedalus from 'dedalus-labs';

const client = new Dedalus();

const stream = await client.chat.completions.create({
  model: 'openai/gpt-5-nano',
  stream: true,
  messages: [
    { role: 'system', content: 'You are Stephen Dedalus. Respond in morose Joycean malaise.' },
    { role: 'user', content: 'What do you think of artificial intelligence?' },
  ],
});
for await (const streamChunk of stream) {
  console.log(streamChunk.id);
}
```

If you need to cancel a stream, you can `break` from the loop
or call `stream.controller.abort()`.

### Request & Response types

This library includes TypeScript definitions for all request params and response fields. You may import and use them like so:

```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
import Dedalus from 'dedalus-labs';

const client = new Dedalus({
  apiKey: process.env['DEDALUS_API_KEY'], // This is the default and can be omitted
  environment: 'development', // defaults to 'production'
});

const params: Dedalus.Chat.CompletionCreateParams = {
  model: 'openai/gpt-5-nano',
  messages: [
    { role: 'system', content: 'You are Stephen Dedalus. Respond in morose Joycean malaise.' },
    { role: 'user', content: 'Hello, how are you today?' },
  ],
};
const completion: Dedalus.Chat.Completion = await client.chat.completions.create(params);
```

Documentation for each method, request param, and response field are available in docstrings and will appear on hover in most modern editors.

## File uploads

Request parameters that correspond to file uploads can be passed in many different forms:

* `File` (or an object with the same structure)
* a `fetch` `Response` (or an object with the same structure)
* an `fs.ReadStream`
* the return value of our `toFile` helper

```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
import fs from 'fs';
import Dedalus, { toFile } from 'dedalus-labs';

const client = new Dedalus();

// If you have access to Node `fs` we recommend using `fs.createReadStream()`:
await client.audio.transcriptions.create({ file: fs.createReadStream('/path/to/file'), model: 'model' });

// Or if you have the web `File` API you can pass a `File` instance:
await client.audio.transcriptions.create({ file: new File(['my bytes'], 'file'), model: 'model' });

// You can also pass a `fetch` `Response`:
await client.audio.transcriptions.create({ file: await fetch('https://somesite/file'), model: 'model' });

// Finally, if none of the above are convenient, you can use our `toFile` helper:
await client.audio.transcriptions.create({
  file: await toFile(Buffer.from('my bytes'), 'file'),
  model: 'model',
});
await client.audio.transcriptions.create({
  file: await toFile(new Uint8Array([0, 1, 2]), 'file'),
  model: 'model',
});
```

## Error Handling

<Warning>Always wrap API calls in try/catch. The SDK throws typed errors for HTTP failures.</Warning>

When the library is unable to connect to the API,
or if the API returns a non-success status code (i.e., 4xx or 5xx response),
a subclass of `APIError` will be thrown:

```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
const completion = await client.chat.completions
  .create({
    model: 'openai/gpt-5-nano',
    messages: [
      { role: 'system', content: 'You are Stephen Dedalus. Respond in morose Joycean malaise.' },
      { role: 'user', content: 'Hello, how are you today?' },
    ],
  })
  .catch(async (err) => {
    if (err instanceof Dedalus.APIError) {
      console.log(err.status); // 400
      console.log(err.name); // BadRequestError
      console.log(err.headers); // {server: 'nginx', ...}
    } else {
      throw err;
    }
  });
```

Error codes are as follows:

| Status Code | Error Type                 |
| ----------- | -------------------------- |
| 400         | `BadRequestError`          |
| 401         | `AuthenticationError`      |
| 403         | `PermissionDeniedError`    |
| 404         | `NotFoundError`            |
| 422         | `UnprocessableEntityError` |
| 429         | `RateLimitError`           |
| >=500       | `InternalServerError`      |
| N/A         | `APIConnectionError`       |

### Retries

Certain errors will be automatically retried 2 times by default, with a short exponential backoff.
Connection errors (for example, due to a network connectivity problem), 408 Request Timeout, 409 Conflict,
429 Rate Limit, and >=500 Internal errors will all be retried by default.

You can use the `maxRetries` option to configure or disable this:

```js theme={"theme":{"light":"github-light","dark":"github-dark"}}
// Configure the default for all requests:
const client = new Dedalus({
  maxRetries: 0, // default is 2
});

// Or, configure per-request:
await client.chat.completions.create({ model: 'openai/gpt-5-nano', messages: [{ role: 'system', content: 'You are Stephen Dedalus. Respond in morose Joycean malaise.' }, { role: 'user', content: 'Hello, how are you today?' }] }, {
  maxRetries: 5,
});
```

### Timeouts

Requests time out after 1 minute by default. You can configure this with a `timeout` option:

```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
// Configure the default for all requests:
const client = new Dedalus({
  timeout: 20 * 1000, // 20 seconds (default is 1 minute)
});

// Override per-request:
await client.chat.completions.create({ model: 'openai/gpt-5-nano', messages: [{ role: 'system', content: 'You are Stephen Dedalus. Respond in morose Joycean malaise.' }, { role: 'user', content: 'Hello, how are you today?' }] }, {
  timeout: 5 * 1000,
});
```

On timeout, an `APIConnectionTimeoutError` is thrown.

Note that requests which time out will be [retried twice by default](#retries).

## Default Headers

We automatically send the following headers with all requests.

| Header          | Value         |
| --------------- | ------------- |
| `User-Agent`    | `Dedalus-SDK` |
| `X-SDK-Version` | `1.0.0`       |

If you need to, you can override these headers by setting default headers on a per-request basis.

```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
import Dedalus from 'dedalus-labs';

const client = new Dedalus();

const completion = await client.chat.completions.create(
  {
    model: 'openai/gpt-5-nano',
    messages: [
      { role: 'system', content: 'You are Stephen Dedalus. Respond in morose Joycean malaise.' },
      { role: 'user', content: 'Hello, how are you today?' },
    ],
  },
  { headers: { 'User-Agent': 'My-Custom-Value' } },
);
```

<Accordion title="Advanced Usage">
  ### Accessing raw Response data (e.g., headers)

  The "raw" `Response` returned by `fetch()` can be accessed through the `.asResponse()` method on the `APIPromise` type that all methods return.
  This method returns as soon as the headers for a successful response are received and does not consume the response body, so you are free to write custom parsing or streaming logic.

  You can also use the `.withResponse()` method to get the raw `Response` along with the parsed data.
  Unlike `.asResponse()` this method consumes the body, returning once it is parsed.

  ```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
  const client = new Dedalus();

  const response = await client.chat.completions
    .create({
      model: 'openai/gpt-5-nano',
      messages: [
        { role: 'system', content: 'You are Stephen Dedalus. Respond in morose Joycean malaise.' },
        { role: 'user', content: 'Hello, how are you today?' },
      ],
    })
    .asResponse();
  console.log(response.headers.get('X-My-Header'));
  console.log(response.statusText); // access the underlying Response object

  const { data: completion, response: raw } = await client.chat.completions
    .create({
      model: 'openai/gpt-5-nano',
      messages: [
        { role: 'system', content: 'You are Stephen Dedalus. Respond in morose Joycean malaise.' },
        { role: 'user', content: 'Hello, how are you today?' },
      ],
    })
    .withResponse();
  console.log(raw.headers.get('X-My-Header'));
  console.log(completion.id);
  ```

  ### Logging

  > \[!IMPORTANT]
  > All log messages are intended for debugging only. The format and content of log messages
  > may change between releases.

  #### Log levels

  The log level can be configured in two ways:

  1. Via the `DEDALUS_LOG` environment variable
  2. Using the `logLevel` client option (overrides the environment variable if set)

  ```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
  import Dedalus from 'dedalus-labs';

  const client = new Dedalus({
    logLevel: 'debug', // Show all log messages
  });
  ```

  Available log levels, from most to least verbose:

  * `'debug'` - Show debug messages, info, warnings, and errors
  * `'info'` - Show info messages, warnings, and errors
  * `'warn'` - Show warnings and errors (default)
  * `'error'` - Show only errors
  * `'off'` - Disable all logging

  At the `'debug'` level, all HTTP requests and responses are logged, including headers and bodies.
  Some authentication-related headers are redacted, but sensitive data in request and response bodies
  may still be visible.

  #### Custom logger

  By default, this library logs to `globalThis.console`. You can also provide a custom logger.
  Most logging libraries are supported, including [pino](https://www.npmjs.com/package/pino), [winston](https://www.npmjs.com/package/winston), [bunyan](https://www.npmjs.com/package/bunyan), [consola](https://www.npmjs.com/package/consola), [signale](https://www.npmjs.com/package/signale), and [@std/log](https://jsr.io/@std/log). If your logger doesn't work, please open an issue.

  When providing a custom logger, the `logLevel` option still controls which messages are emitted, messages
  below the configured level will not be sent to your logger.

  ```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
  import Dedalus from 'dedalus-labs';
  import pino from 'pino';

  const logger = pino();

  const client = new Dedalus({
    logger: logger.child({ name: 'Dedalus' }),
    logLevel: 'debug', // Send all messages to pino, allowing it to filter
  });
  ```

  ### Making custom/undocumented requests

  This library is typed for convenient access to the documented API. If you need to access undocumented
  endpoints, params, or response properties, the library can still be used.

  #### Undocumented endpoints

  To make requests to undocumented endpoints, you can use `client.get`, `client.post`, and other HTTP verbs.
  Options on the client, such as retries, will be respected when making these requests.

  ```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
  await client.post('/some/path', {
    body: { some_prop: 'foo' },
    query: { some_query_arg: 'bar' },
  });
  ```

  #### Undocumented request params

  To make requests using undocumented parameters, you may use `// @ts-expect-error` on the undocumented
  parameter. This library doesn't validate at runtime that the request matches the type, so any extra values you
  send will be sent as-is.

  ```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
  client.chat.completions.create({
    // ...
    // @ts-expect-error baz is not yet public
    baz: 'undocumented option',
  });
  ```

  For requests with the `GET` verb, any extra params will be in the query, all other requests will send the
  extra param in the body.

  If you want to explicitly send an extra argument, you can do so with the `query`, `body`, and `headers` request
  options.

  #### Undocumented response properties

  To access undocumented response properties, you may access the response object with `// @ts-expect-error` on
  the response object, or cast the response object to the requisite type. Like the request params, we do not
  validate or strip extra properties from the response from the API.

  ### Customizing the fetch client

  By default, this library expects a global `fetch` function is defined.

  If you want to use a different `fetch` function, you can either polyfill the global:

  ```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
  import fetch from 'my-fetch';

  globalThis.fetch = fetch;
  ```

  Or pass it to the client:

  ```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
  import Dedalus from 'dedalus-labs';
  import fetch from 'my-fetch';

  const client = new Dedalus({ fetch });
  ```

  ### Fetch options

  If you want to set custom `fetch` options without overriding the `fetch` function, you can provide a `fetchOptions` object when instantiating the client or making a request. (Request-specific options override client options.)

  ```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
  import Dedalus from 'dedalus-labs';

  const client = new Dedalus({
    fetchOptions: {
      // `RequestInit` options
    },
  });
  ```

  #### Configuring proxies

  To modify proxy behavior, you can provide custom `fetchOptions` that add runtime-specific proxy
  options to requests:

  **Node** <sup>\[[docs](https://github.com/nodejs/undici/blob/main/docs/docs/api/ProxyAgent.md#example---proxyagent-with-fetch)]</sup>

  ```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
  import Dedalus from 'dedalus-labs';
  import * as undici from 'undici';

  const proxyAgent = new undici.ProxyAgent('http://localhost:8888');
  const client = new Dedalus({
    fetchOptions: {
      dispatcher: proxyAgent,
    },
  });
  ```

  **Bun** <sup>\[[docs](https://bun.sh/guides/http/proxy)]</sup>

  ```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
  import Dedalus from 'dedalus-labs';

  const client = new Dedalus({
    fetchOptions: {
      proxy: 'http://localhost:8888',
    },
  });
  ```

  **Deno** <sup>\[[docs](https://docs.deno.com/api/deno/~/Deno.createHttpClient)]</sup>

  ```ts theme={"theme":{"light":"github-light","dark":"github-dark"}}
  import Dedalus from 'npm:dedalus-labs';

  const httpClient = Deno.createHttpClient({ proxy: { url: 'http://localhost:8888' } });
  const client = new Dedalus({
    fetchOptions: {
      client: httpClient,
    },
  });
  ```
</Accordion>

## Frequently Asked Questions

## Semantic versioning

This package generally follows [SemVer](https://semver.org/spec/v2.0.0.html) conventions, though certain backwards-incompatible changes may be released as minor versions:

1. Changes that only affect static types, without breaking runtime behavior.
2. Changes to library internals which are technically public but not intended or documented for external use. *(Please open a GitHub issue to let us know if you are relying on such internals.)*
3. Changes that we do not expect to impact the vast majority of users in practice.

We take backwards-compatibility seriously and work hard to ensure you can rely on a smooth upgrade experience.

We are keen for your feedback; please open an [issue](https://www.github.com/dedalus-labs/dedalus-sdk-typescript/issues) with questions, bugs, or suggestions.

<Accordion title="Requirements">
  TypeScript >= 4.9 is supported.

  The following runtimes are supported:

  * Web browsers (Up-to-date Chrome, Firefox, Safari, Edge, and more)
  * Node.js 20 LTS or later ([non-EOL](https://endoflife.date/nodejs)) versions.
  * Deno v1.28.0 or higher.
  * Bun 1.0 or later.
  * Cloudflare Workers.
  * Vercel Edge Runtime.
  * Jest 28 or greater with the `"node"` environment (`"jsdom"` is not supported at this time).
  * Nitro v2.6 or greater.

  Note that React Native is not supported at this time.

  If you are interested in other runtime environments, please open or upvote an issue on GitHub.
</Accordion>