# GridColumnDef

Fields, allowed values, and APIs that use GridColumnDef.

Canonical: https://grid.syidax.com/docs/types/GridColumnDef/

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## Type definition

A question mark (?) marks an optional field; readonly marks a value you should not change directly. A union (|) accepts one of the listed forms. Functions are callbacks that Grid invokes at the relevant point.

```typescript
export interface GridColumnDef {
  key: string;
  label: string;
  width?: number;
}
```

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## APIs using this type

- [columns](https://grid.syidax.com/docs/options/columns.md) — Compatibility input for column definitions. Prefer columnDefs in new configurations.