> For the complete documentation index, see [llms.txt](https://docs.hatsprotocol.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.hatsprotocol.xyz/for-developers/hats-modules/modules-sdk/get-available-modules.md).
# Get Available Modules
The following functions are used in order to get available modules, as exist in the [Modules Registry](/for-developers/hats-modules/building-hats-modules/modules-registry.md).
See the Module type [here](/for-developers/hats-modules/modules-sdk/types.md#module).
### getModules
Get all available modules, optionally use a filter function in order to retrieve only a subset of the modules.
```typescript
const modules = hatsModulesClient.getAllModules();
```
***Arguments***:
```typescript
filter?: (module: Module) => boolean
```
An optional filter function. For each [Module](/for-developers/hats-modules/modules-sdk/types.md#module), should return `true` if the module should be included, `false` otherwise.
***Response***:
```typescript
{ [id: string]: Module }
```
An object that maps between module IDs and the corresponding module objects. A module ID is its implementation address.
### getModuleById
Get a module object by its ID.
```typescript
const module = hatsModulesClient.getModuleById(moduleId);
```
***Arguments***:
```typescript
string
```
Module's ID (implementation address).
***Response***:
Module | undefined
The module that matches the provided ID, or `undefined` in case no matching module was found.
### getModuleByImplementation
Get a module object by its implementation address.
```typescript
const module = hatsModulesClient.getModuleByImplementation(address);
```
***Arguments***:
```typescript
`0x${string}`
```
Module's implementation address.
***Response***:
Module | undefined
The module that matches the provided address, or `undefined` in case no matching module was found.
### getModuleByInstance
Get the module object of an instance.
```typescript
const module = await hatsModulesClient.getModuleByInstance(address);
```
***Arguments***:
```typescript
`0x${string}`
```
Module's instance address.
***Response***:
Module | undefined
The module that matches the provided address, or `undefined` in case no matching module was found.
### getModulesByInstances
Get the module objects of instances.
```typescript
const modules = await hatsModulesClient.getModulesByInstances(addresses);
```
***Arguments***:
```typescript
`0x${string}`[]
```
Addresses of the module instances.
***Response***:
(Module | undefined)[]
The modules matching the provided addresses. For every address that is not an instance of a registry module, the corresponding return value in the array will be `undefined`.