> ## Documentation Index
> Fetch the complete documentation index at: https://upstash-dx-3081-agentkit-tanstack-ai-backends.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# $histogram

`$histogram` groups numeric values into fixed-width interval buckets.

Use it for distribution charts when each bucket has the same width.

### Compatibility

| Field Type | Supported |
| - | - |
| TEXT | No |
| U64/I64/F64 | Yes |
| DATE | Yes |
| BOOL | No |
| KEYWORD | No |
| FACET | No |

Field must be `FAST`.

### Arguments

| Argument | Type | Required | Description |
| - | - | - | - |
| `field` | `string` | Yes | Field to bucket on. |
| `interval` | `number` | Yes | Bucket width. |
| `offset` | `number` | No | Shift bucket boundaries. |
| `minDocCount` | `number` | No | Exclude buckets with fewer docs. |
| `hardBounds` | `{ min: number, max: number }` | No | Hard clamp for bucket range. |
| `extendedBounds` | `{ min: number, max: number }` | No | Emit buckets across this range, including empty ones. |
| `keyed` | `boolean` | No | If `true`, returns buckets as an object. Default: `false`. |

For `hardBounds` and `extendedBounds`, both `min` and `max` are required.

<Tabs>
  <Tab title="TypeScript">
    ```ts theme={null}
    await index.aggregate({
      aggregations: {
        price_distribution: {
          $histogram: { field: "price", interval: 25 },
        },
      },
    });
    ```
  </Tab>

  <Tab title="Python">
    ```python theme={null}
    index.aggregate(
        aggregations={
            "price_distribution": {
                "$histogram": {"field": "price", "interval": 25}
            }
        }
    )
    ```
  </Tab>

  <Tab title="Redis CLI">
    ```bash theme={null}
    SEARCH.AGGREGATE products '{}' '{"price_distribution": {"$histogram": {"field": "price", "interval": 25}}}'
    ```
  </Tab>
</Tabs>

### Output

```json theme={null}
{
  "price_distribution": {
    "buckets": [
      { "key": 0, "docCount": 3 },
      { "key": 25, "docCount": 4 },
      { "key": 50, "docCount": 2 }
    ]
  }
}
```

Bucket entries can include `keyAsString` and nested sub-aggregation outputs.


## Related topics

- [$dateHistogram](/redis/search/aggregation-operators/bucket-aggregations/date-histogram.md)
- [Build a Serverless Histogram API with Redis](/redis/tutorials/histogram.md)
- [Overview](/redis/search/aggregation-operators/bucket-aggregations/overview.md)
- [Aggregations](/redis/search/aggregations.md)
- [$composite](/redis/search/aggregation-operators/bucket-aggregations/composite.md)