Hi all Glancing at DebugAdapter.jl it seemed to me that you could debug a program “after the fact”, i.e. attach a debugger to it once it has started. Is that correct? Can DebugAdapter.jl do this? If so, can this functionality be used from the vscode plugin? I’m fine with running my code through a s…

Yes, check out the docs at Debugging code from the REPL - Debugging · Julia in VS Code The Julia extension supports debugging of all types of Julia programs and applications. | Documentation for Julia in VS Code.

Nice! Does the REPL have to be launched from vscode? How does vscode know which REPL to connect to? By port number? Can I launch a REPL outside of vscode and then connect to it? Thanks for your help!

[image] zuckerruebe: Does the REPL have to be launched from vscode? No, not necessarily. [image] zuckerruebe: How, does vscode know which REPL to connect to? By port number? A socket path gets passed at startup. [image] zuckerruebe: Can I launch a REPL outside of vscode and then …

Is it an actual REPL I need to attach to? A Debugger.jl “session” (if such a thing exists) isn’t enough? I believe debugging in the REPL relies on Debugger.jl under the hood? I’m asking because I’m embedding Julia using jlrs and I don’t have a running REPL there, nor do I know of an official way to …

something like py-spy for Julia would be quite cool. I have something vibe coded locally that provides similar features

Julia: Connect external REPL requires an actual REPL, yes. DebugAdapter.jl doesn’t, but it’s easiest to use from one and we don’t currently officially support attaching to random Julia processes. [image] zuckerruebe: I believe debugging in the REPL relies on Debugger.jl under the hood? Yes, …

Thanks for your reply. My current workflow is Start a Julia REPL outside of vscode Connect external REPL (get the “external REPL connected” message) include my script there after having set a breakpoint in it in vscode However, my breakpoint isn’t hit. Any idea what I’m doing wrong? Thanks!

Check out the instructions at Debugging code from the REPL - Debugging · Julia in VS Code The Julia extension supports debugging of all types of Julia programs and applications. | Documentation for Julia in VS Code. and also this thread: [image] …

Attach debugger to running process

Tooling VS Code

pfitzseb May 5, 2026, 10:07am 9

Check out the instructions at

and also this thread:

Topic		Replies	Views
[ANN] VS Code extension v0.15 released - with debugger VS Code announcement	21	7636	August 31, 2020
How to debug a script in existing REPL using VSCode VS Code vscode	3	2491	August 4, 2022
Connect REPL to jupyter notebook kernel VS Code jupyter , vscode , ijulia	7	1561	September 21, 2024
Julia debugging General Usage debug , vscode	4	889	August 30, 2022
[ANN] Annonuncing PlutoVSCodeDebugger.jl Package Announcements	2	743	August 22, 2023

Attach debugger to running process

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