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Moya/docs/Examples/ParameterEncoding.md
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2017-10-06 16:14:46 +02:00

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# Use a custom ParameterEncoding
Moya is using dictionary as a root container for JSON data. But sometimes you will need to send JSON array as a root element instead. Here is solution by writing your own parameter encoding:
Define a struct or class:
```swift
import Alamofire
struct JSONArrayEncoding: ParameterEncoding {
static let `default` = JSONArrayEncoding()
func encode(_ urlRequest: URLRequestConvertible, with parameters: Parameters?) throws -> URLRequest {
var request = try urlRequest.asURLRequest()
guard let json = parameters?["jsonArray"] else {
return request
}
let data = try JSONSerialization.data(withJSONObject: json, options: [])
if request.value(forHTTPHeaderField: "Content-Type") == nil {
request.setValue("application/json", forHTTPHeaderField: "Content-Type")
}
request.httpBody = data
return request
}
}
```
Configure the target:
```swift
public var task: Task {
switch self {
case .api:
return .requestParameters(parameters: ["jsonArray": ["Yes", "What", "abc"]], encoding: JSONArrayEncoding.default)
}
}
```
This will send data as a JSON array `["Yes", "What", "Abc"]` for the `.api` endpoint. For more information, see discussion in: [#467](https://github.com/Moya/Moya/issues/467)