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

# validation_error

> Request body or parameters failed validation

|                 |                            |
| --------------- | -------------------------- |
| **HTTP status** | `422 Unprocessable Entity` |
| **Error code**  | `validation_error`         |

## What happened

The request was well-formed but failed schema validation. One or more fields violated type, format, range, or presence constraints.

The `errors` array contains one entry per field. Each includes a `location` (e.g. `body.items[3].name`) and a `message` describing the violation.

## How to fix

Inspect the `errors` array, fix the offending fields, and retry.