# MiddlewareService

Orchestrates dynamic middleware registered through the Medusa Middleware API

## Constructors

### constructor

**new MiddlewareService**()

#### Defined in

[medusa/src/services/middleware.ts:22](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L22)

## Properties

### postAuthentication\_

 `Protected` `Readonly` **postAuthentication\_**: `middlewareType`[]

#### Defined in

[medusa/src/services/middleware.ts:17](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L17)

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### preAuthentication\_

 `Protected` `Readonly` **preAuthentication\_**: `middlewareType`[]

#### Defined in

[medusa/src/services/middleware.ts:18](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L18)

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### preCartCreation\_

 `Protected` `Readonly` **preCartCreation\_**: `RequestHandler`<`ParamsDictionary`, `any`, `any`, `ParsedQs`, Record<`string`, `any`\>\>[]

#### Defined in

[medusa/src/services/middleware.ts:19](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L19)

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### routers

 `Protected` `Readonly` **routers**: Record<`string`, `Router`[]\>

#### Defined in

[medusa/src/services/middleware.ts:20](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L20)

## Methods

### addPostAuthentication

**addPostAuthentication**(`middleware`, `options`): `void`

Adds a middleware function to be called after authentication is completed.

#### Parameters

| Name | Description |
| :------ | :------ |
| `middleware` | `middlewareHandlerType` | the middleware function. Should return a middleware function. |
| `options` | Record<`string`, `unknown`\> | the arguments that will be passed to the middleware |

#### Returns

`void`

-`void`: (optional) void

#### Defined in

[medusa/src/services/middleware.ts:60](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L60)

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### addPreAuthentication

**addPreAuthentication**(`middleware`, `options`): `void`

Adds a middleware function to be called before authentication is completed.

#### Parameters

| Name | Description |
| :------ | :------ |
| `middleware` | `middlewareHandlerType` | the middleware function. Should return a middleware function. |
| `options` | Record<`string`, `unknown`\> | the arguments that will be passed to the middleware |

#### Returns

`void`

-`void`: (optional) void

#### Defined in

[medusa/src/services/middleware.ts:79](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L79)

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### addPreCartCreation

**addPreCartCreation**(`middleware`): `void`

Adds a middleware function to be called before cart creation

#### Parameters

| Name | Description |
| :------ | :------ |
| `middleware` | `RequestHandler`<`ParamsDictionary`, `any`, `any`, `ParsedQs`, Record<`string`, `any`\>\> | the middleware function. Should return a middleware function. |

#### Returns

`void`

-`void`: (optional) 

#### Defined in

[medusa/src/services/middleware.ts:96](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L96)

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### addRouter

**addRouter**(`path`, `router`): `void`

#### Parameters

| Name |
| :------ |
| `path` | `string` |
| `router` | `Router` |

#### Returns

`void`

-`void`: (optional) 

#### Defined in

[medusa/src/services/middleware.ts:29](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L29)

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### getRouters

**getRouters**(`path`): `Router`[]

#### Parameters

| Name |
| :------ |
| `path` | `string` |

#### Returns

`Router`[]

-`Router[]`: 
	-`Router`: 

#### Defined in

[medusa/src/services/middleware.ts:34](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L34)

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### usePostAuthentication

**usePostAuthentication**(`app`): `void`

Adds post authentication middleware to an express app.

#### Parameters

| Name | Description |
| :------ | :------ |
| `app` | `Router` | the express app to add the middleware to |

#### Returns

`void`

-`void`: (optional) 

#### Defined in

[medusa/src/services/middleware.ts:106](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L106)

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### usePreAuthentication

**usePreAuthentication**(`app`): `void`

Adds pre authentication middleware to an express app.

#### Parameters

| Name | Description |
| :------ | :------ |
| `app` | `Router` | the express app to add the middleware to |

#### Returns

`void`

-`void`: (optional) 

#### Defined in

[medusa/src/services/middleware.ts:117](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L117)

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### usePreCartCreation

**usePreCartCreation**(): `RequestHandler`<`ParamsDictionary`, `any`, `any`, `ParsedQs`, Record<`string`, `any`\>\>[]

#### Returns

`RequestHandler`<`ParamsDictionary`, `any`, `any`, `ParsedQs`, Record<`string`, `any`\>\>[]

-`RequestHandler<ParamsDictionary, any, any, ParsedQs, Record<string, any\>\>[]`: 
	-`RequestHandler`: 
		-`any`: (optional) 
		-`any`: (optional) 
		-`Record`: 

#### Defined in

[medusa/src/services/middleware.ts:123](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L123)

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### validateMiddleware\_

**validateMiddleware_**(`fn`): `void`

Validates a middleware function, throws if fn is not of type function.

#### Parameters

| Name | Description |
| :------ | :------ |
| `fn` | `unknown` | the middleware function to validate. |

#### Returns

`void`

-`void`: (optional) nothing if the middleware is a function

#### Defined in

[medusa/src/services/middleware.ts:43](https://github.com/medusajs/medusa/blob/0af6e5534/packages/medusa/src/services/middleware.ts#L43)