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A simple, fast user-agent parsing library based on BrowserScope's UA database with a good default dictionary.


Add :ua_parser to your mix.exs dependencies:

def deps do
    {:ua_parser, "~> 1.8"}


iex> ua = UAParser.parse("Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_5_7; en-us) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Safari/530.17 Skyfire/2.0")
  device: %UAParser.Device{family: nil},
  family: "Skyfire",
  os: %UAParser.OperatingSystem{
    family: "Mac OS X",
    version: %UAParser.Version{major: "10", minor: "5", patch: "7", patch_minor: nil}
  version: %UAParser.Version{major: "2", minor: "0", patch: nil, patch_minor: nil}
iex> to_string(ua)
"Skyfire 2.0"
iex> to_string(ua.os)
"Mac OS X 10.5.7"
iex> to_string(ua.device)

Retrieving and parsing a user-agent string from Plug:

ua =
  |> Plug.Conn.get_req_header("user-agent")
  |> List.first()
  |> UAParser.parse()


There is an example Phoenix application with a simple endpoint/route to retrieve the user agent header. To run it, simply cd into the example directory, and run the following:


$ mix do deps.get, compile
$ npm i && brunch build
# change the configuration to match your own postgres username/password
$ mix do ecto.create, ecto.migrate
$ iex -S mix phoenix.server
# visit localhost:4000/user_agent


It can also be used as a simple plug:

mix new ua_plug
cd ua_plug

And now set up mix.exs:

# ...
defp deps do
   {:cowboy, "~> 1.0.0"},
   {:plug, "~> 1.0"},
   {:ua_parser, git: "",
                branch: "master"},
# ...

And we get our deps and compile:

$ mix do deps.get, compile

And now we can make our plug:

defmodule UAPlug do
  import Plug.Conn

  def init(options), do: options

  def call(conn, _opts) do
    ua =
         |> Plug.Conn.get_req_header("user-agent")
         |> List.first()
         |> UAParser.parse()
    send_resp(200, ua)

From here we can pipe requests through it in other applications or use it on its own as we please.

Copyright (c) 2016 Sean Callan

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.