# IdentityDeserializer

**Kind:** Class

**Source:** [`packages/microservices/deserializers/identity.deserializer.ts`](https://github.com/nestjs/nest/blob/master/packages/microservices/deserializers/identity.deserializer.ts#L6)

**Part of:** [Microservices](subsystem-packages-microservices)

`IdentityDeserializer` is a pass-through microservice deserializer that returns incoming message data without transforming it. It is useful when a transport adapter already provides data in the format expected by the application and no custom parsing or normalization is required.

**Implements:** `Deserializer`

## Methods

| Method | Signature | Returns |
|---|---|---|
| `deserialize` | `deserialize(value: any)` | `void` |

## Diagram

```mermaid
graph LR
  A[Microservice Transport] --> B[Incoming Message]
  B --> C[IdentityDeserializer]
  C --> D[deserialize()]
  D --> E[Original Message Value]
  E --> F[Message Handler]
```

## Usage

```ts
import { IdentityDeserializer } from '@nestjs/microservices';

const deserializer = new IdentityDeserializer();

const incomingMessage = {
  pattern: 'user.created',
  data: {
    id: 'user-123',
    email: 'user@example.com',
  },
};

const result = deserializer.deserialize(incomingMessage);

console.log(result === incomingMessage); // true
```

## AI Coding Instructions

- Use `IdentityDeserializer` when transport payloads should be passed directly to message handlers without parsing or transformation.
- Do not add validation, serialization, or cloning logic here; use a custom deserializer when payload normalization is required.
- Ensure the configured microservice transport produces payloads compatible with the consuming handler's expected shape.
- Configure this deserializer through the microservice transport options when replacing a transport-specific or custom deserialization strategy.