How to send POST request with both parameter and body for JSON data in Swift 3 using Alamofire 4?

Postman api url added below.

Present code :

let baseUrl = "abc.com/search/"
let param  =  [
        "page":"1",
        "size":"5",
        "sortBy":"profile_locality"
    ]

    let headers = [
        "Content-Type": "application/json"
    ]


    Alamofire.SessionManager.default.request("\(baseUrl)field", method: .post,parameters: param, encoding: JSONEncoding.default, headers: headers).responseJSON { response in
        print(response.request ?? "no request")  // original URL request
        if(response.response?.statusCode != nil){
            print("done")
            if self.checkResponse(response.response!.statusCode){
                let json = JSON(data: response.data!)
                //print("at_LeadStop json \(json)")
                return completionHandler(json, false)

            } else {
                return completionHandler(JSON.null, true)
            }
        } else {
            print("gone")
            return completionHandler(JSON.null, true)
        }}

I don't know how to add body request through this code. Please help me to slove this problem.