Cannot locate kernels under `%APPDATA%/jupyter/kernels`

[n-riesco]

Steps to reproduce:

1. Create file %APPDATA%/jupyter/kernels/javascript/kernel.json:

   { "argv": [ "C:\Users\User\AppData\Roaming\ijskernel.cmd", "--hide-undefined", "{connection_file}", "--protocol=5.0" ], "display_name": "Javascript (Node.js)", "language": "javascript" }

2. Open a node session and run:

   > var ks = require("kernelspecs")
   > ks.findAll().then(console.log)
   {}

---

Re:

• https://github.com/nteract/hydrogen/issues/1261
• http://jupyter-client.readthedocs.io/en/stable/kernels.html#kernel-specs

[n-riesco]

After some debugging, it turned out to be an issue with parsing kernel.json in windows. Fixed by escaping the backward-slashes in kernel.json:

{ "argv": [ "C:\\Users\\User\\AppData\\Roaming\\ijskernel.cmd", "--hide-undefined", "{connection_file}", "--protocol=5.0" ], "display_name": "Javascript (Node.js)", "language": "javascript" }