help needed: manual nvim-dap configuration for javascript works on windows but not on linux

[battlelitany]

Debug adapter definition and debug configuration

Hi, I am painfully new to coding/nvim in general, so please forgive me if this is a dumb question. I followed the instructions from here: Javascript Adapter Installation

I got it all set up and working correctly on Windows 11. My configuration file is here at pastebin. I am using Pop OS for Linux. I downloaded the js-debug-dap from the vscode-js-debug release and updated the pathway to dapDebugServer.js.

For whatever reason though, it gives me an error saying it can't connect to localhost. I'm sure it must just be something silly I forgot to do, but I can't figure out how to solve it. I tried looking up help and guides, but most of them show you how to set it up with nvim-dap-vscode-js. I couldn't get that to work though, and my current manual setup already works on Windows, so I'd prefer to stick with it. Any help would be much appreciated!

Debug adapter version

No response

Steps to Reproduce

1. Enter js file
2. Set breakpoint
3. Attempt to run

Expected Result

It shows the nvim-dap-ui on Windows, but will not run on Linux.

Actual Result

node exited with code 1
Couldn't connect to localhost:${port}: ECONNREFUSED

[mfussenegger]

Looks like they changed their default binding logic, and they now only bind to ipv6 ::1 instead of ipv4 127.0.0.1 .

It should work if you change the configuration to:

dap.adapters["pwa-node"] = {
  type = "server",
  host = "::1",
  port = "${port}",
  executable = {
    command = "node",
    args = {"/path/to/js-debug/src/dapDebugServer.js", "${port}"}
  }
}

A good way to debug issues like this is to run the command in the terminal. E.g.:

node src/dapDebugServer.js 1234

Gave the following output:

Debug server listening at ::1:1234

[battlelitany]

Looks like they changed their default binding logic, and they now only bind to ipv6 ::1 instead of ipv4 127.0.0.1 .

It should work if you change the configuration to:

dap.adapters["pwa-node"] = {
  type = "server",
  host = "::1",
  port = "${port}",
  executable = {
    command = "node",
    args = {"/path/to/js-debug/src/dapDebugServer.js", "${port}"}
  }
}

A good way to debug issues like this is to run the command in the terminal. E.g.:

node src/dapDebugServer.js 1234

Gave the following output:

Debug server listening at ::1:1234

I tried this, but unfortunately, it still doesn't work for me. It gives me the same error: Couldn't connect to ::1:${port}: ECONNREFUSED.

Here's my edited configuration:

require("dap").adapters["pwa-node"] = {
   type = "server",
   host = "::1",
   port = "${port}",
   executable = {
   command = "node",
   args = { "/home/user/js-debug/src/dapDebugServer.js", "${port}" },
   },
}

If I run the terminal command, it gives me this output:

node js-debug/src/dapDebugServer.js 1234
Error: listen EADDRINUSE: address already in use ::1:1234
    at Server.setupListenHandle [as _listen2] (node:net:1898:16)
    at listenInCluster (node:net:1946:12)
    at GetAddrInfoReqWrap.doListen [as callback] (node:net:2116:7)
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (node:dns:109:8) {
  code: 'EADDRINUSE',
  errno: -98,
  syscall: 'listen',
  address: '::1',
  port: 1234
}

EDIT: Also, I tried troubleshooting the error, but when I run lsof -i ::1, I get this readout:

lsof: unknown service :1 in: -i ::1
lsof 4.93.2
 latest revision: https://github.com/lsof-org/lsof
 latest FAQ: https://github.com/lsof-org/lsof/blob/master/00FAQ
 latest (non-formatted) man page: https://github.com/lsof-org/lsof/blob/master/Lsof.8
 usage: [-?abhKlnNoOPRtUvVX] [+|-c c] [+|-d s] [+D D] [+|-E] [+|-e s] [+|-f[gG]]
 [-F [f]] [-g [s]] [-i [i]] [+|-L [l]] [+m [m]] [+|-M] [-o [o]] [-p s]
 [+|-r [t]] [-s [p:s]] [-S [t]] [-T [t]] [-u s] [+|-w] [-x [fl]] [--] [names]

Thank you for such a prompt response, and apologies for troubling you!

[GhostOrder28]

@battlelitany did you manage to make it work? if not, did you tried running the adapter manually in a separate terminal?

home/user/js-debug/src/dapDebugServer.js

That path is a bit suspicious, in my case dapDebugServer.js is located in:

/home/<my user name>/.local/share/nvim/mason/packages/js-debug-adapter/js-debug/src/dapDebugServer.js

Because I installed it with Mason, how did you installed the adapter?

[battlelitany]

If this is what you mean by running the adapter in a separate terminal, then the output for that is below!

node js-debug/src/dapDebugServer.js
Debug server listening at ::1:8123

The path is specified that way because I installed the adapter manually! On the instructions page from here for manual installation, it said to download and extract to any folder.

I did so on Windows by putting it at the bottom of my C: drive and that worked perfectly! Since the instructions didn't seem to say if they were Windows/Linux specific, I assumed the same process would work on Linux. As such, I also extracted it and put it at the base of my Home folder.

Again, apologies for the trouble. I'm new to coding and Linux and a lot of it is just me trying to fumble around to teach myself things. I'd like to apologize if I missed something obvious while trying to troubleshoot this. Thank you for your help!

[GhostOrder28]

The path is specified that way because I installed the adapter manually!

Gotcha, I asked just in case because one can sometimes make typos when writing paths.

Can you try modifying your adapter config this way?

require("dap").adapters["pwa-node"] = {
   type = "server",
   host = "::1",
   port = "8123
}

Then first run the adapter manually and then try to start a debug session in nvim.

Also can you share your config for require("dap").configurations.<your language>

[battlelitany]

This works! It still strangely gives a "node exited with code 1" error, but the nvim-dap does indeed launch and run properly. Thank you! I'm not sure why it still gives the error though.

Here's the config of the part I edited and my language:

    require("dap").adapters["pwa-node"] = {
      type = "server",
      host = "::1",
      port = "8123",
      executable = {
        command = "node",
        args = {
          "C:/home/cafe/js-debug/src/dapDebugServer.js",
          "${port}",
        },
      },
    }

    require("dap").configurations.javascript = {
      {
        type = "pwa-node",
        request = "launch",
        name = "Launch file",
        program = "${file}",
        cwd = "${workspaceFolder}",
        console = "integratedTerminal", --this keeps the terminal from creating a new window
      },
    }

[battlelitany]

Had the chance to test this configuration again on a different linux computer (same OS though) and it still gives the same "node exited with code 1" error but will run. I still have to run the adapter manually first in the terminal though!

I'm happy it works, but is there any way I can skip having to run the adapter manually first?