# FASTIFY_ROUTE_CONSTRAINTS_METADATA

**Kind:** Constant

**Source:** [`packages/platform-fastify/constants.ts`](https://github.com/nestjs/nest/blob/master/packages/platform-fastify/constants.ts#L2)

**Part of:** [Platform Fastify](subsystem-packages-platform-fastify)

## Definition

```ts
'__fastify_route_constraints__'
```

## Value

```ts
'__fastify_route_constraints__'
```