Just LSP binary found but not working: just-lsp

[assyrus-favolo]

I always get this error when the extension loads:

Just LSP binary found but not working: just-lsp. Please check the installation or configure the path in settings.

How can I inspect the error that occurs?

[sz3lbi]

I'm having the same issue. I installed the LSP with Homebrew on Debian 13.

[anentropic]

I have the same issue

It's odd because the code looks very straightforward:

vscode-just/src/lsp.ts

Lines 19 to 25 in d67c650

	const isAvailable = await checkLspAvailability(lspPath);
	if (!isAvailable) {
	vscode.window
	.showWarningMessage(
	`Just LSP binary found but not working: ${lspPath}. Please check the installation or configure the path in settings.`,
	'Install Instructions',
	)

and

vscode-just/src/lsp.ts

Lines 77 to 94 in d67c650

	const checkLspAvailability = (lspPath: string): Promise<boolean> => {
	return new Promise((resolve) => {
	const process = spawn(lspPath, ['--version'], { stdio: 'ignore' });
	process.on('close', (code: number) => {
	resolve(code === 0);
	});
	process.on('error', () => {
	resolve(false);
	});
	setTimeout(() => {
	process.kill();
	resolve(false);
	}, 5000);
	});
	};

in settings I have:

In VS Code terminal:

% which just-lsp
/Users/anentropic/.cargo/bin/just-lsp

% just-lsp --version
just-lsp 0.3.4

It's not obvious to me why this is failing

(I also tried putting /Users/anentropic/.cargo/bin/just-lsp in Settings but same symptom)

[nefrob]

I'll try and test #92 later today to see if this resolves the issue.

[nefrob]

Did the recent release resolve this for anyone? I tried with brew and mise installed just + just-lsp and have not had any issues, but there could be config differences.

[assyrus-favolo]

Trying right now I get this in the output:

[2026-03-18T15:28:53.922Z] [info] Just LSP started successfully using: just-lsp

I'd say it's fixed, so I'll close, thank you! 💚

[anentropic]

I am still getting this issue

% which just-lsp
/Users/anentropic/.cargo/bin/just-lsp

% just-lsp --version
just-lsp 0.4.0

vscode-just 0.10.1