# \#jupyterlab

**URL:** https://discourse.jupyter.org/tag/jupyterlab/15.md

[Latest](https://discourse.jupyter.org/latest.md) · [Categories](https://discourse.jupyter.org/categories.md) · [Tags](https://discourse.jupyter.org/tags.md)

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## [nbview: a client-side notebook viewer as a fallback when nbviewer is down](https://discourse.jupyter.org/t/nbview-a-client-side-notebook-viewer-as-a-fallback-when-nbviewer-is-down/38907)

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**Author:** [@chiz](https://discourse.jupyter.org/u/chiz)\
**Replies:** 2\
**Last updated:** [October 8, 2026, 9:22pm UTC](https://discourse.jupyter.org/t/nbview-a-client-side-notebook-viewer-as-a-fallback-when-nbviewer-is-down/38907 "2026-10-08T21:22:20Z")

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Hi all, I use nbviewer a lot for sharing notebooks, and when it’s been unavailable I’ve wanted a fallback, so I built a small one: nbview.org. It’s fully client-side. The browser fetches the .ipynb straight from raw.gi…

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## [Logs flooded with 403s](https://discourse.jupyter.org/t/logs-flooded-with-403s/33867)

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**Author:** [@maatthias](https://discourse.jupyter.org/u/maatthias)\
**Replies:** 20\
**Last updated:** [September 21, 2026, 8:07pm UTC](https://discourse.jupyter.org/t/logs-flooded-with-403s/33867 "2026-09-21T20:07:16Z")

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For last few weeks jupyterhub server logs have filled up with messages like these: Mar 17 10:35:20 jupyter jupyterhub\[1232207\]: \[W 2025-03-17 10:35:20.685 JupyterHub web:1873\] 403 POST /hub/api/users/jsmith/activity (10…

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## [JupyterLab not responding](https://discourse.jupyter.org/t/jupyterlab-not-responding/38876)

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**Author:** [@M\_Heinrich](https://discourse.jupyter.org/u/M_Heinrich)\
**Replies:** 1\
**Last updated:** [September 18, 2026, 6:54pm UTC](https://discourse.jupyter.org/t/jupyterlab-not-responding/38876 "2026-09-18T18:54:01Z")

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Tried to fix problem using Tai but got nowhere. Tai said to include this: When posting, include: Course: Develop Generative AI Applications: Get Started Notebook: In-Context Learning and Prompt Templates for Advanced …

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## [Kuusi — JupyterLab notebook Extensions Mind Map (feedback welcome)](https://discourse.jupyter.org/t/kuusi-jupyterlab-notebook-extensions-mind-map-feedback-welcome/38802)

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**Author:** [@Hans\_Cao](https://discourse.jupyter.org/u/Hans_Cao)\
**Replies:** 3\
**Last updated:** [September 17, 2026, 8:33pm UTC](https://discourse.jupyter.org/t/kuusi-jupyterlab-notebook-extensions-mind-map-feedback-welcome/38802 "2026-09-17T20:33:11Z")

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Hi everyone, Kuusi is a JupyterLab 4 extension that turns a notebook into a spatial mind map: markdown headings become the tree, and cells stay native Jupyter Code/Markdown cells (not a custom editor). V0.2.4 Screen…

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## [Phantom Text bug](https://discourse.jupyter.org/t/phantom-text-bug/38871)

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**Author:** [@frutty](https://discourse.jupyter.org/u/frutty)\
**Replies:** 1\
**Last updated:** [September 13, 2026, 4:29am UTC](https://discourse.jupyter.org/t/phantom-text-bug/38871 "2026-09-13T04:29:42Z")

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I have phantom text problems in JupyterLab. I type text in a cell, the text shows on the screen, but the cursor stays where it is (it should move after the typed text), then the text I typed disappears and the cell runs…

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## [DevScholar for JupyterLab: hover metadata and PDF preview for paper references in notebooks](https://discourse.jupyter.org/t/devscholar-for-jupyterlab-hover-metadata-and-pdf-preview-for-paper-references-in-notebooks/38867)

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**Author:** [@pallaprolus](https://discourse.jupyter.org/u/pallaprolus)\
**Replies:** 0\
**Last updated:** [September 12, 2026, 3:52pm UTC](https://discourse.jupyter.org/t/devscholar-for-jupyterlab-hover-metadata-and-pdf-preview-for-paper-references-in-notebooks/38867 "2026-09-12T15:52:01Z")

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Hi all, I built a small JupyterLab 4 extension for research notebooks and just released 0.4.0. What it does: when a notebook mentions a paper, for example arxiv:1706.03762, doi:10.1038/nature14539 or a full arXiv or DO…

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## [Using Jupyter AI without Real-Time Collaboration (RTC)](https://discourse.jupyter.org/t/using-jupyter-ai-without-real-time-collaboration-rtc/38782)

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**Author:** [@guy\_ford](https://discourse.jupyter.org/u/guy_ford)\
**Replies:** 10\
**Last updated:** [August 17, 2026, 9:07am UTC](https://discourse.jupyter.org/t/using-jupyter-ai-without-real-time-collaboration-rtc/38782 "2026-08-17T09:07:35Z")

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Hi everyone, I’m trying to deploy Jupyter AI in a multi-user JupyterHub environment running on an HPC cluster. Our users do not need Real-Time Collaboration (RTC). We only want the AI capabilities (chat, notebook assis…

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## [Developing new extensions,](https://discourse.jupyter.org/t/developing-new-extensions/38757)

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**Author:** [@DaveC](https://discourse.jupyter.org/u/DaveC)\
**Replies:** 1\
**Last updated:** [July 14, 2026, 3:49pm UTC](https://discourse.jupyter.org/t/developing-new-extensions/38757 "2026-07-14T15:49:20Z")

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When developing new extensions, is there a group of dev’s who can contribute.

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## [Set notebook\_starts\_kernel=False only for specific notebooks?](https://discourse.jupyter.org/t/set-notebook-starts-kernel-false-only-for-specific-notebooks/38744)

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**Author:** [@jbd](https://discourse.jupyter.org/u/jbd)\
**Replies:** 0\
**Last updated:** [July 6, 2026, 11:50pm UTC](https://discourse.jupyter.org/t/set-notebook-starts-kernel-false-only-for-specific-notebooks/38744 "2026-07-06T23:50:02Z")

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Hello, Is there a way to make it so that jupyterlab will open some notebooks without starting the kernel, while at the same time automatically starting the kernel for other notebooks? I am working on a project where som…

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## [JupyterLab with Jupyter-AI initial setup and config](https://discourse.jupyter.org/t/jupyterlab-with-jupyter-ai-initial-setup-and-config/38723)

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**Author:** [@ashrama](https://discourse.jupyter.org/u/ashrama)\
**Replies:** 1\
**Last updated:** [June 30, 2026, 10:41am UTC](https://discourse.jupyter.org/t/jupyterlab-with-jupyter-ai-initial-setup-and-config/38723 "2026-06-30T10:41:23Z")

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I have not used either before, and the last time I used python seriously was before virtual environments. I’m wanting to work on a few statistics projects that will mostly use r but a little python too. Since I’m disable…

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## [Collaboration on shared storage](https://discourse.jupyter.org/t/collaboration-on-shared-storage/38709)

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**Author:** [@utop](https://discourse.jupyter.org/u/utop)\
**Replies:** 1\
**Last updated:** [June 19, 2026, 6:52am UTC](https://discourse.jupyter.org/t/collaboration-on-shared-storage/38709 "2026-06-19T06:52:16Z")

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Hi, TLDR: We wan’t to enable collaboration on a filesystem shared between jupyter-servers. Is there a way to make jupyter-collaboration work in this context (single filesystem, mutliple separated server). If not, is it …

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## [ElasticKernel – automatic checkpoint/restore of kernel execution state](https://discourse.jupyter.org/t/elastickernel-automatic-checkpoint-restore-of-kernel-execution-state/38708)

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**Author:** [@MRyutaro](https://discourse.jupyter.org/u/MRyutaro)\
**Replies:** 0\
**Last updated:** [June 14, 2026, 5:06pm UTC](https://discourse.jupyter.org/t/elastickernel-automatic-checkpoint-restore-of-kernel-execution-state/38708 "2026-06-14T17:06:22Z")

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Hi all, I built ElasticKernel, an IPython kernel that automatically saves and restores the execution state of a notebook, so a kernel restart or crash doesn’t wipe your session. You just select the “Python 3 (Elastic)” …

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## [Python kernel crashing with 502 Bad Gateway in Jupyter Docker(only on one particular VM) – R/JULIA kernels work fine](https://discourse.jupyter.org/t/python-kernel-crashing-with-502-bad-gateway-in-jupyter-docker-only-on-one-particular-vm-r-julia-kernels-work-fine/38640)

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**Author:** [@Dikshyant\_Thapa](https://discourse.jupyter.org/u/Dikshyant_Thapa)\
**Replies:** 0\
**Last updated:** [May 23, 2026, 1:31pm UTC](https://discourse.jupyter.org/t/python-kernel-crashing-with-502-bad-gateway-in-jupyter-docker-only-on-one-particular-vm-r-julia-kernels-work-fine/38640 "2026-05-23T13:31:21Z")

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Hi all, I’m an SRE working in a data company and I’ve been stuck on a very strange issue for days. When I click Python kernel: -\> I get “502 Bad Gateway” → container restarts automatically (restart policy is enabled…

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## [Error executing Jupyter command 'lab': \[WinError 5\] Access is denied](https://discourse.jupyter.org/t/error-executing-jupyter-command-lab-winerror-5-access-is-denied/38509)

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**Author:** [@Naveen\_Shetty](https://discourse.jupyter.org/u/Naveen_Shetty)\
**Replies:** 1\
**Last updated:** [April 14, 2026, 1:35pm UTC](https://discourse.jupyter.org/t/error-executing-jupyter-command-lab-winerror-5-access-is-denied/38509 "2026-04-14T13:35:51Z")

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Hi All, I was using jupyter lab upuntil now with no issues. I think I had 3.6.8 vesrion, then I got a notification in the Jupyter lab that a new version is available 4.5.6. So I updated it. Now I can not open the jupyte…

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## [Ipywidget in kernel-output extension doesn't work](https://discourse.jupyter.org/t/ipywidget-in-kernel-output-extension-doesnt-work/38506)

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**Author:** [@kevdav](https://discourse.jupyter.org/u/kevdav)\
**Replies:** 1\
**Last updated:** [April 10, 2026, 11:48pm UTC](https://discourse.jupyter.org/t/ipywidget-in-kernel-output-extension-doesnt-work/38506 "2026-04-10T23:48:14Z")

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Is it possible to show custom widgets in the output panel of an extension like extension-examples/kernel-output at main · jupyterlab/extension-examples · GitHub ? I see only a text representation instead of the actual wi…

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## [JSONDecodeError: Expecting value: line 1 column 1 (char 0). Error from task 5.51 for the taiwan bankruptcy assignment y](https://discourse.jupyter.org/t/jsondecodeerror-expecting-value-line-1-column-1-char-0-error-from-task-5-51-for-the-taiwan-bankruptcy-assignment-y/38466)

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**Author:** [@DEON86](https://discourse.jupyter.org/u/DEON86)\
**Replies:** 1\
**Last updated:** [March 18, 2026, 6:00pm UTC](https://discourse.jupyter.org/t/jsondecodeerror-expecting-value-line-1-column-1-char-0-error-from-task-5-51-for-the-taiwan-bankruptcy-assignment-y/38466 "2026-03-18T18:00:09Z")

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I keep getting the same error message for task 5.5.1 for the taiwan bankruptcy assignment. it also says the file could be empty.

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## [Button 'render with voila' - connection refused](https://discourse.jupyter.org/t/button-render-with-voila-connection-refused/26435)

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**Author:** [@biernatt](https://discourse.jupyter.org/u/biernatt)\
**Replies:** 13\
**Last updated:** [March 12, 2026, 12:11pm UTC](https://discourse.jupyter.org/t/button-render-with-voila-connection-refused/26435 "2026-03-12T12:11:51Z")

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Hello Jupyter team, I’m on migration form Jupyter notebook to JupyterHub because of LDAP integrity. JupyterHub is running on docker, there is only one instance in my setup. All member use ‘/lab’ and everything works …

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## [Shared tool based on jupyter lab for teams connections](https://discourse.jupyter.org/t/shared-tool-based-on-jupyter-lab-for-teams-connections/38389)

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**Author:** [@si-yo](https://discourse.jupyter.org/u/si-yo)\
**Replies:** 0\
**Last updated:** [February 10, 2026, 11:01pm UTC](https://discourse.jupyter.org/t/shared-tool-based-on-jupyter-lab-for-teams-connections/38389 "2026-02-10T23:01:15Z")

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Hello ! I want to share to you a tool that help you and your teams across projects research and connections. Hope and smile !

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## [Is JupyterLab participating in GSOC ' 26 under NUMFocus?](https://discourse.jupyter.org/t/is-jupyterlab-participating-in-gsoc-26-under-numfocus/38382)

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**Author:** [@KH-Coder865](https://discourse.jupyter.org/u/KH-Coder865)\
**Replies:** 4\
**Last updated:** [February 9, 2026, 11:01am UTC](https://discourse.jupyter.org/t/is-jupyterlab-participating-in-gsoc-26-under-numfocus/38382 "2026-02-09T11:01:35Z")

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It would be great to know if JupyterLab is participating in GSOC ’ 26 under NUMFocus ?

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## [AccordionPanel “in-place” collapse: preserving SplitPanel invariants via an invisible sink section](https://discourse.jupyter.org/t/accordionpanel-in-place-collapse-preserving-splitpanel-invariants-via-an-invisible-sink-section/38384)

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**Author:** [@KH-Coder865](https://discourse.jupyter.org/u/KH-Coder865)\
**Replies:** 0\
**Last updated:** [February 8, 2026, 3:17pm UTC](https://discourse.jupyter.org/t/accordionpanel-in-place-collapse-preserving-splitpanel-invariants-via-an-invisible-sink-section/38384 "2026-02-08T15:17:18Z")

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Hi everyone, I’d like to open a discussion around an alternative collapse behavior for AccordionPanel, and the trade-offs involved. Background AccordionPanel is built on top of SplitPanel, whose core invariant is that…

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## [I built a JupyterLab extension for composing pipelines from multiple notebooks](https://discourse.jupyter.org/t/i-built-a-jupyterlab-extension-for-composing-pipelines-from-multiple-notebooks/38377)

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**Author:** [@petebachant](https://discourse.jupyter.org/u/petebachant)\
**Replies:** 0\
**Last updated:** [February 5, 2026, 2:06pm UTC](https://discourse.jupyter.org/t/i-built-a-jupyterlab-extension-for-composing-pipelines-from-multiple-notebooks/38377 "2026-02-05T14:06:14Z")

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The target audience for the Calkit extension is scientists and other researchers who often create collections of notebooks for different aspects of their projects but don’t automate their execution, so they need to be…

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## [🚀 Introducing JupyterLab Pioneer](https://discourse.jupyter.org/t/introducing-jupyterlab-pioneer/22216)

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**Author:** [@mengyanw](https://discourse.jupyter.org/u/mengyanw)\
**Replies:** 1\
**Last updated:** [February 4, 2026, 1:13pm UTC](https://discourse.jupyter.org/t/introducing-jupyterlab-pioneer/22216 "2026-02-04T13:13:23Z")

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We’re thrilled to introduce jupyterlab-pioneer, a new extension designed to help you collect JupyterLab activity data effortlessly. The intention of this extension is to support data-driven research and design of new Jup…

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## [Access to collaboration server based on identity provider](https://discourse.jupyter.org/t/access-to-collaboration-server-based-on-identity-provider/38319)

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**Author:** [@ISaxvik](https://discourse.jupyter.org/u/ISaxvik)\
**Replies:** 1\
**Last updated:** [January 14, 2026, 2:26pm UTC](https://discourse.jupyter.org/t/access-to-collaboration-server-based-on-identity-provider/38319 "2026-01-14T14:26:56Z")

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Hello! :smiley: From this link: Real-time collaboration without impersonation — JupyterHub documentation, it says it is possible to base members of a collaboration server on the identity provider: I would like to ba…

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## [Seeking Advice on Hardening JupyterLab 4.4.8 for Data Leakage Prevention (DLP)](https://discourse.jupyter.org/t/seeking-advice-on-hardening-jupyterlab-4-4-8-for-data-leakage-prevention-dlp/38283)

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**Author:** [@taehun\_Lee](https://discourse.jupyter.org/u/taehun_Lee)\
**Replies:** 1\
**Last updated:** [January 6, 2026, 2:54pm UTC](https://discourse.jupyter.org/t/seeking-advice-on-hardening-jupyterlab-4-4-8-for-data-leakage-prevention-dlp/38283 "2026-01-06T14:54:45Z")

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Hi everyone, I am managing a JupyterLab 4.4.8 environment deployed within a private network. This environment serves as the sole gateway for analysts to access a highly sensitive data lake. Due to strict security polici…

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## [Unable to run Jest tests locally on macOS - ESM module resolution issues with @jupyter/web-components](https://discourse.jupyter.org/t/unable-to-run-jest-tests-locally-on-macos-esm-module-resolution-issues-with-jupyter-web-components/38242)

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**Author:** [@pranshugupta01](https://discourse.jupyter.org/u/pranshugupta01)\
**Replies:** 0\
**Last updated:** [December 18, 2025, 7:42pm UTC](https://discourse.jupyter.org/t/unable-to-run-jest-tests-locally-on-macos-esm-module-resolution-issues-with-jupyter-web-components/38242 "2025-12-18T19:42:17Z")

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Environment OS: macOS (darwin) Node.js version: v23.9.0 (also tested with v20.11.1) JupyterLab branch: main (latest) Problem Description I’m unable to run Jest tests locally on macOS. Tests that pass in CI fai…

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## [How to build wheel](https://discourse.jupyter.org/t/how-to-build-wheel/38241)

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**Author:** [@wanli1171310208](https://discourse.jupyter.org/u/wanli1171310208)\
**Replies:** 0\
**Last updated:** [December 18, 2025, 2:05pm UTC](https://discourse.jupyter.org/t/how-to-build-wheel/38241 "2025-12-18T14:05:47Z")

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How do I create a wheel for JupyterLab? jlpm install jlpm run build python -m build I modified the relevant JavaScript scripts in the packages directory and followed the steps to build the wheel package. After build…

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## [Jupyter Datascience Notebook Websocket ping timeout error](https://discourse.jupyter.org/t/jupyter-datascience-notebook-websocket-ping-timeout-error/38090)

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**Author:** [@Anik\_Du](https://discourse.jupyter.org/u/Anik_Du)\
**Replies:** 4\
**Last updated:** [December 10, 2025, 9:33am UTC](https://discourse.jupyter.org/t/jupyter-datascience-notebook-websocket-ping-timeout-error/38090 "2025-12-10T09:33:15Z")

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Hello, I have been using the Jupyter Datascience notebook deployed through ArgoCD + Kubernetes for 2 years. I never had an issue with this notebook until last Friday (31st October, 2025). Suddenly, the Kubernetes Pod st…

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## [Cell not executed due to pending input](https://discourse.jupyter.org/t/cell-not-executed-due-to-pending-input/24036)

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**Author:** [@Luca\_Rivitti](https://discourse.jupyter.org/u/Luca_Rivitti)\
**Replies:** 8\
**Last updated:** [December 5, 2025, 3:46pm UTC](https://discourse.jupyter.org/t/cell-not-executed-due-to-pending-input/24036 "2025-12-05T15:46:21Z")

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Hi community! i just started learning python and have been using jupyter notebook. Was trying to run a mean code to calculate it based on numbers pasted with " " in between. I used AI to help me with this code and it wo…

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## [ModuleNotFoundError:](https://discourse.jupyter.org/t/modulenotfounderror/38190)

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**Author:** [@SACORBSR](https://discourse.jupyter.org/u/SACORBSR)\
**Replies:** 1\
**Last updated:** [December 2, 2025, 4:56pm UTC](https://discourse.jupyter.org/t/modulenotfounderror/38190 "2025-12-02T16:56:06Z")

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Good Morning - I am new to Python. A co-worker of mine (no longer with the company) wrote some code for a small project I run regularly. I am suddenly getting the error “ModuleNotFoundError: No module named ‘geopandas’.…

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## [Issue loading LaTeX macros from a file](https://discourse.jupyter.org/t/issue-loading-latex-macros-from-a-file/38175)

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**Author:** [@lance.ramshaw](https://discourse.jupyter.org/u/lance.ramshaw)\
**Replies:** 0\
**Last updated:** [November 29, 2025, 4:02pm UTC](https://discourse.jupyter.org/t/issue-loading-latex-macros-from-a-file/38175 "2025-11-29T16:02:25Z")

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IPython display(Math()) in an initial code cell works fine to load my LaTeX macros from a file, and they then remain active throughout the notebook. But I’m having trouble with this macro: \\newcommand{\\inv}{^{-1}} Unli…

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