cosmos-sdk/docs/sdk/sdk-by-examples/simple-governance/app-codec.md

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## Application codec
**File: [`app/app.go`](https://github.com/cosmos/cosmos-sdk/blob/fedekunze/module_tutorial/examples/simpleGov/app/app.go)**
Finally, we need to define the `MakeCodec()` function and register the concrete types and interface from the various modules.
```go
func MakeCodec() *wire.Codec {
var cdc = wire.NewCodec()
wire.RegisterCrypto(cdc) // Register crypto.
sdk.RegisterWire(cdc) // Register Msgs
bank.RegisterWire(cdc)
simplestake.RegisterWire(cdc)
simpleGov.RegisterWire(cdc)
// Register AppAccount
cdc.RegisterInterface((*auth.Account)(nil), nil)
cdc.RegisterConcrete(&types.AppAccount{}, "simpleGov/Account", nil)
return cdc
}
```