How can I log each request/response using Alamofire?

There's a sweet little pod for this: https://github.com/konkab/AlamofireNetworkActivityLogger

Add this to your podfile:

pod 'AlamofireNetworkActivityLogger', '~> 2.0'

In your AppDelegate:

import AlamofireNetworkActivityLogger

Then in your didFinishLaunchingWithOptions, add this:

NetworkActivityLogger.shared.level = .debug
NetworkActivityLogger.shared.startLogging()

EDIT: I've actually encountered crashes with this in production. To be on the safe side, use "build flags" to only use this in debug, something like this:

#if DEBUG
    NetworkActivityLogger.shared.level = .debug
    NetworkActivityLogger.shared.startLogging()
#endif

Something like this might be what you were looking for:

extension Request {
   public func debugLog() -> Self {
      #if DEBUG
         debugPrint(self)
      #endif
      return self
   }
}

Usage:

Alamofire.request(.GET, "http://httpbin.org/get", parameters: ["foo": "bar"])
         .debugLog()
         .response {…}

If you want to print all responses, you could write your own response method, similar to the responseObject() method at the top of this tutorial:

http://www.raywenderlich.com/87595/intermediate-alamofire-tutorial

[Update: added below per the request from @trauzti.]

Here's how one might do the responseObject() approach in order to print output on every request.

Caveat lector: I haven't personally tested this code, and would probably make different choices in production. This simply shows how the Wenderlich tutorial code can include debug logging. Also note: since the tutorial is pre-Swift 2.0, I've used the old println() instead of print().

@objc public protocol ResponseObjectSerializable {
  init(response: NSHTTPURLResponse, representation: AnyObject)
}

extension Alamofire.Request {
  public func responseObject<T: ResponseObjectSerializable>(completionHandler: (NSURLRequest, NSHTTPURLResponse?, T?, NSError?) -> Void) -> Self {
    let serializer: Serializer = { (request, response, data) in

      #if DEBUG
         println("Request: \(request.URL)")
      #endif

      let JSONSerializer = Request.JSONResponseSerializer(options: .AllowFragments)
      let (JSON: AnyObject?, serializationError) = JSONSerializer(request, response, data)
      if response != nil && JSON != nil {
        #if DEBUG
           println("Response:")
           debugPrint(JSON)
        #endif

        return (T(response: response!, representation: JSON!), nil)
      } else {
        #if DEBUG
           println("Failed Serialization:")
           debugPrint(serializationError)
        #endif

        return (nil, serializationError)
      }
    }

    return response(serializer: serializer, completionHandler: { (request, response, object, error) in
      completionHandler(request, response, object as? T, error)
    })
  }
}

Since Alamofire 5, the easiest way is to define an EventMonitor subclass:

final class AlamofireLogger: EventMonitor {
    func requestDidResume(_ request: Request) {
        let body = request.request.flatMap { $0.httpBody.map { String(decoding: $0, as: UTF8.self) } } ?? "None"
        let message = """
        ⚡️ Request Started: \(request)
        ⚡️ Body Data: \(body)
        """
        NSLog(message)
    }

    func request<Value>(_ request: DataRequest, didParseResponse response: DataResponse<Value>) {
        NSLog("⚡️ Response Received: \(response.debugDescription)")
    }
}

Then use it on your session:

let session = Session(eventMonitors: [ AlamofireLogger() ])

This sample code was adapted from https://github.com/Alamofire/Alamofire/issues/2867#issuecomment-509662892

Timberjack is what you are looking. Timberjack is a simple, unintrusive network activity logger. Log every request your app makes, or limit to only those using a certain NSURLSession if you’d prefer. It also works with Alamofire, if that’s your thing.

https://cocoapods.org/pods/Timberjack

usage:

import Alamofire
import Timberjack

class HTTPManager: Alamofire.Manager {
static let sharedManager: HTTPManager = {
    let configuration = Timberjack.defaultSessionConfiguration()
    let manager = HTTPManager(configuration: configuration)
    return manager
}()
}

Adding to above answer for Alamofire 4.0+ Swift 3

extension DataRequest {        
        public func LogRequest() -> Self {
        //Your logic for logging
        return self
    }
}

When Requesting

Alamofire.request(requestUrl, method: .post, parameters: parameter, encoding: JSONEncoding.default)
            .LogRequest()
            .responseJSON { response in
            //Do your thing
            }

If you want to cancel the request in any case(which was something I wanted) you can self.cancel() anywhere before you return self

How can I log each request/response using Alamofire?

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