Go implementation of ua-parser
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elsigh Merge pull request #48 from F21/bump-uap-core
Bump uap-core to 590f66f40b00644efa6045d06e3c2a605eb22ea1
Latest commit 621e080 Jul 8, 2018


Golang User Agent parser

This is the Go implementation of the ua-parser



$ go get github.com/ua-parser/uap-go/uaparser


uap-core definitions are, by default, compiled and included in the Go portion of this package. To regenerate these definitions you can run the build.sh script.


$ cd uaparser
$ go test -v -cover

When adding new feature you can check for data race with go test -race, although this command will take more than 2 minutes to execute since the -race flag adds some instrumentation on all regex matches

So a quicker way to test data race on the main *parser.Parse method can be:

$ go test -race -run=Concurrency  # filter to execute `TestGenericParseMethodConcurrency` only


If needed, you can run benchmark on your latest feature to be compared (using benchcmp) against the current performance

$ cd uaparser
$ git checkout master
$ go test -bench=.  -run=none > ~/old.benchmark
$ git checkout my_latest_feature
$ go test -bench=.  -run=none > ~/new.benchmark
$ benchcmp ~/old.benchmark ~/new.benchmark


package main

import (


func main() {
  uagent := "Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us; Silk/1.1.0-80) AppleWebKit/533.16 (KHTML, like Gecko) Version/5.0 Safari/533.16 Silk-Accelerated=true"

  parser, err := uaparser.New("./regexes.yaml")
  if err != nil {

  client := parser.Parse(uagent)

  fmt.Println(client.UserAgent.Family)  // "Amazon Silk"
  fmt.Println(client.UserAgent.Major)   // "1"
  fmt.Println(client.UserAgent.Minor)   // "1"
  fmt.Println(client.UserAgent.Patch)   // "0-80"
  fmt.Println(client.Os.Family)         // "Android"
  fmt.Println(client.Os.Major)          // ""
  fmt.Println(client.Os.Minor)          // ""
  fmt.Println(client.Os.Patch)          // ""
  fmt.Println(client.Os.PatchMinor)     // ""
  fmt.Println(client.Device.Family)     // "Kindle Fire"


  • Yihuan Zhou

(Based on the Java implementation by Steve Jiang and using agent data from BrowserScope)