# MESSAGES

**Kind:** Constant

**Source:** [`packages/core/constants.ts`](https://github.com/nestjs/nest/blob/master/packages/core/constants.ts#L3)

**Part of:** [Core](subsystem-packages-core)

## Definition

```ts
{
  APPLICATION_START: `Starting Nest application...`,
  APPLICATION_READY: `Nest application successfully started`,
  MICROSERVICE_READY: `Nest microservice successfully started`,
  UNKNOWN_EXCEPTION_MESSAGE: 'Internal server error',
  ERROR_DURING_SHUTDOWN: 'Error happened during shutdown',
  CALL_LISTEN_FIRST:
    'app.listen() needs to be called before calling app.getUrl()',
}
```

## Value

```ts
{
  APPLICATION_START: `Starting Nest application...`,
  APPLICATION_READY: `Nest application successfully started`,
  MICROSERVICE_READY: `Nest microservice successfully started`,
  UNKNOWN_EXCEPTION_MESSAGE: 'Internal server error',
  ERROR_DURING_SHUTDOWN: 'Error happened during shutdown',
  CALL_LISTEN_FIRST:
    'app.listen() needs to be called before calling app.getUrl()',
}
```

## Relationships

- IMPORTS → `EnhancerSubtype`

## Used by

3 references from 3 files. Each is a place in this repository where the symbol is actually used — go read one rather than trusting an example.

### Imported by (3)

- `BaseRpcExceptionFilter` — `packages/microservices/exceptions/base-rpc-exception-filter.ts`:15
- `NestMicroservice` — `packages/microservices/nest-microservice.ts`:35
- `ErrorPayload` — `packages/websockets/exceptions/base-ws-exception-filter.ts`:11