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

# Validation recipes

> Copy-paste GoldenCheck configs for common jobs: validate a customer file, enforce enums and ranges, and catch outliers.

The [config matrix](/docs/goldencheck/config-matrix) lists every check type. This page is the task-shaped shortcut. `goldencheck scan your.csv` profiles and flags issues with no config; write a config when you want to *enforce* a schema. Every config below is a complete, valid file (CI validates each against the live schema).

```bash theme={null}
goldencheck scan your.csv --config recipe.yaml
```

## Validate a customer file

**You have** a contact file and a contract for what "valid" means. **You want** required fields present, emails well-formed, and IDs unique.

```yaml theme={null}
version: 1
columns:
  customer_id:
    type: string
    required: true
    unique: true
  email:
    type: string
    required: true
    format: email
  phone:
    type: string
    nullable: true
```

## Enforce enums and ranges

**You have** status and numeric columns that must stay within known bounds. **You want** any out-of-range or unexpected value flagged.

```yaml theme={null}
version: 1
columns:
  status:
    type: string
    enum: [active, inactive, pending]
  age:
    type: int
    range: [0, 120]
```

## Catch numeric outliers

**You have** a measure column where extreme values usually mean bad data. **You want** statistical outliers surfaced.

`outlier_stddev` flags values more than N standard deviations from the mean.

```yaml theme={null}
version: 1
columns:
  amount:
    type: float
    outlier_stddev: 3.0
```