> ## Documentation Index
> Fetch the complete documentation index at: https://arizeai-433a7140.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Datasets

> Create and inspect datasets with @arizeai/phoenix-client

Datasets are the foundation for experiment runs. The dataset helpers cover creation, idempotent creation, record inspection, and example appends.

<section className="hidden" data-agent-context="relevant-source-files" aria-label="Relevant source files">
  <h2>Relevant Source Files</h2>

  <ul>
    <li>
      <code>src/datasets/createOrGetDataset.ts</code> for the exact return
      shape of the idempotent helper
    </li>
  </ul>
</section>

## Create A Dataset

```ts theme={null}
import { createDataset } from "@arizeai/phoenix-client/datasets";

const { datasetId } = await createDataset({
  name: "support-eval",
  description: "Support questions with expected answers",
  examples: [
    {
      input: { question: "Where is my order?" },
      output: { answer: "Use the tracking page in your account." },
      metadata: { channel: "chat" },
    },
  ],
});
```

## Reuse Or Append

```ts theme={null}
import {
  appendDatasetExamples,
  createOrGetDataset,
} from "@arizeai/phoenix-client/datasets";

const dataset = await createOrGetDataset({
  name: "support-eval",
  description: "Support questions with expected answers",
  examples: [],
});

await appendDatasetExamples({
  dataset,
  examples: [
    {
      input: { question: "How do I reset my password?" },
      output: { answer: "Use the forgot password flow." },
    },
  ],
});
```

`createOrGetDataset()` returns `{ datasetId }`, so you can pass that object directly as the dataset selector for append or experiment calls.

## Read Back Dataset State

Use `getDataset`, `getDatasetExamples`, and `getDatasetInfo` to inspect datasets after creation.

<section className="hidden" data-agent-context="source-map" aria-label="Source map">
  <h2>Source Map</h2>

  <ul>
    <li><code>src/datasets/createDataset.ts</code></li>
    <li><code>src/datasets/createOrGetDataset.ts</code></li>
    <li><code>src/datasets/appendDatasetExamples.ts</code></li>
    <li><code>src/datasets/getDataset.ts</code></li>
    <li><code>src/datasets/getDatasetExamples.ts</code></li>
    <li><code>src/datasets/getDatasetInfo.ts</code></li>
  </ul>
</section>