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Encrypt your socks transmission.

Why another Nodejs implementation?

Nodejs is a very good choice to achieve both flexibility and good performance in this situation.

And I have found that many of who are familiar with the original implementation may be curious about the memory usage so that I have finished some simple benchmarks to measure its behavior.


You can get the benchmark details here or even test your own implementation.

After some simple benchmarks that compare both the node and python implementation, my conclusion is:

  1. Node has a different GC strategy but it's, of course, able to keep thousands of connections with a reasonable memory usage. It's not a bug, it's a conscious time/space trade-off.

  2. Each request would cost less time to get responsed (even 50% less time in some situations).

  3. Node implementation is less likely to fail requests in high concurrency situation.

And the higher concurrency benchmarks may be meaningless as the bandwidth and network environment would become the actual bottleneck in the real world.

Do Please point out my faults if I have missed something or get something wrong.


node >= v4

It's recommended to use node v6 to achieve better performance.


npm i -g encryptsocks

About the daemon

Encryptsocks use pm2 as the watcher process from 1.4.0.


Use localssjs (local ssjs) to start clients to communicate with applications. The localssjs server will also serve a pac file at (by default) for your apps to avoid unnecessary tunnel work.

You may prefer to navigate clients page and choose clients for your devices instead of using localssjs.

Use serverssjs (server ssjs) to start your remote server.

Use localssjs -h or serverssjs -h to show cli options:

Proxy options:
  -c config                     path to config file
  -s SERVER_ADDR                server address, default:
  -p SERVER_PORT                server port, default: 8083
  -l LOCAL_ADDR                 local binding address, default:
  -b LOCAL_PORT                 local port, default: 1080
  -k PASSWORD                   password
  -m METHOD                     encryption method, default: aes-128-cfb
  -t TIMEOUT                    timeout in seconds, default: 600
  --pac_port PAC_PORT           PAC file server port, default: 8090
  --pac_update_gfwlist [URL]    [localssjs] Update the gfwlist
                                for PAC server. You can specify the
                                request URL.
  --level LOG_LEVEL             log level, default: warn
                                example: --level verbose
General options:
  -h, --help                    show this help message and exit
  -d start/stop/restart         daemon mode


Start clients that bind at 1088 and will connect to MY.SSSERVER.DOMAIN:

$ localssjs -b 1088 -s MY.SSSERVER.DOMAIN

Start daemon:

$ localssjs -d start -b 1080

Log verbosely:

$ serverssjs -d start --level verbose

Update GFWList for your .pac file server:

$ localssjs --pac_update_gfwlist

Update GFWList for your .pac file server from a specific URL (default url):

$ localssjs --pac_update_gfwlist


  "serverAddr": "",
  "serverPort": 8083,
  "localAddr": "",
  "localPort": 1080,
  "pacServerPort": 8090,
  "password": "YOUR_PASSWORD_HERE",
  "timeout": 600,
  "method": "aes-128-cfb",

  "level": "warn",
  "localAddrIPv6": "::1",
  "serverAddrIPv6": "::1"

Specify your config file with -c flag:

$ serverssjs -c config.json

You can change default config in config.json file of your global package.

SOCKS5 Username Password Authetication

NOTE: This authetication is dangerous when sniffed.

Add auth property to your config.json and make forceAuth true.

  "auth": {
    "forceAuth": true,
    "usernamePassword": {
      "name": "password"


Encryption methods

  • aes-128-cfb
  • aes-192-cfb
  • aes-256-cfb
  • bf-cfb
  • camellia-128-cfb
  • camellia-192-cfb
  • camellia-256-cfb
  • cast5-cfb
  • des-cfb
  • idea-cfb
  • rc2-cfb
  • rc4
  • rc4-md5
  • seed-cfb


$ npm test


$ npm run watch

About the support to UDP relay

I intend to implement UDP relay and I have implement it. but I can't find an effective way to test this in real world networking. Please create issues to help us if you know any applications that support UDP-socks well.



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