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TypeError: the JSON object must be str, not 'bytes'

See original GitHub issue

I successfully installed and use jupyterlab-toc:

jupyter labextension list
JupyterLab v0.32.1
Known labextensions:
   app dir: /data/srlab/slowikow/src/miniconda2/envs/py3/share/jupyter/lab
jupyterlab-toc
        jupyterlab-toc v0.2.1  enabled  OK

Today, I decided to try to upgrade to v0.3.1, but I get an error:

jupyter labextension install @jupyterlab/toc
> /data/srlab/slowikow/src/miniconda2/envs/py3/bin/npm pack @jupyterlab/toc
jupyterlab-toc-0.3.1.tgz

Errored, use --debug for full output:
TypeError: the JSON object must be str, not 'bytes'

It seems like an easy bug to fix, but I don’t know which file has the buggy code.

I hope you can help!

Thanks for the great extension 👍

Here are more details:

jupyter labextension install --debug @jupyterlab/toc

jupyter labextension install --debug @jupyterlab/toc
Searching ['/PHShome/ks38', '/PHShome/ks38/.jupyter', '/data/srlab/slowikow/src/miniconda2/envs/py3/etc/jupyter', '/usr/local/etc/jupyter', '/etc/jupyter'] for config files
Looking for jupyter_config in /etc/jupyter
Looking for jupyter_config in /usr/local/etc/jupyter
Looking for jupyter_config in /data/srlab/slowikow/src/miniconda2/envs/py3/etc/jupyter
Looking for jupyter_config in /PHShome/ks38/.jupyter
Looking for jupyter_config in /PHShome/ks38
> /data/srlab/slowikow/src/miniconda2/envs/py3/bin/npm pack @jupyterlab/toc
jupyterlab-toc-0.3.1.tgz


   ╭─────────────────────────────────────╮
   │                                     │
   │   Update available 5.6.0 → 6.2.0    │
   │     Run npm i -g npm to update      │
   │                                     │
   ╰─────────────────────────────────────╯

Fetching URL: https://registry.npmjs.org/@jupyterlab%2Ftoc
Traceback (most recent call last):

  File "/data/srlab/slowikow/src/miniconda2/envs/py3/lib/python3.5/site-packages/jupyterlab/labextensions.py", line 71, in start
    ans = self.run_task()

  File "/data/srlab/slowikow/src/miniconda2/envs/py3/lib/python3.5/site-packages/jupyterlab/labextensions.py", line 100, in run_task
    for arg in self.extra_args

  File "/data/srlab/slowikow/src/miniconda2/envs/py3/lib/python3.5/site-packages/jupyterlab/labextensions.py", line 100, in <listcomp>
    for arg in self.extra_args

  File "/data/srlab/slowikow/src/miniconda2/envs/py3/lib/python3.5/site-packages/jupyterlab/commands.py", line 227, in install_extension
    return handler.install_extension(extension)

  File "/data/srlab/slowikow/src/miniconda2/envs/py3/lib/python3.5/site-packages/jupyterlab/commands.py", line 366, in install_extension
    info = self._install_extension(extension, tempdir)

  File "/data/srlab/slowikow/src/miniconda2/envs/py3/lib/python3.5/site-packages/jupyterlab/commands.py", line 1138, in _install_extension
    version = self._latest_compatible_package_version(name)

  File "/data/srlab/slowikow/src/miniconda2/envs/py3/lib/python3.5/site-packages/jupyterlab/commands.py", line 1202, in _latest_compatible_package_version
    metadata = _fetch_package_metadata(self.registry, name, self.logger)

  File "/data/srlab/slowikow/src/miniconda2/envs/py3/lib/python3.5/site-packages/jupyterlab/commands.py", line 1588, in _fetch_package_metadata
    return json.load(response)

  File "/data/srlab/slowikow/src/miniconda2/envs/py3/lib/python3.5/json/__init__.py", line 268, in load
    parse_constant=parse_constant, object_pairs_hook=object_pairs_hook, **kw)

  File "/data/srlab/slowikow/src/miniconda2/envs/py3/lib/python3.5/json/__init__.py", line 312, in loads
    s.__class__.__name__))

TypeError: the JSON object must be str, not 'bytes'


Errored, use --debug for full output:
TypeError: the JSON object must be str, not 'bytes'