What Is Console Ninja?

Updated

Console Ninja is a VS Code extension that displays console.log output and runtime errors directly next to the line of code that produced them, instead of in the browser DevTools or an integrated terminal. It is aimed at JavaScript and TypeScript developers who debug inside VS Code and want to avoid switching windows to read log output. The extension is available in a free version, with a separate Pro tier offering additional features.

The problem it solves

The normal debugging loop for front-end and Node.js code looks like this:

  1. Add a console.log(...) statement.
  2. Run the app.
  3. Switch to the browser console or terminal.
  4. Find the matching log line among unrelated output.
  5. Switch back to the editor to change the code.

Steps 3 and 4 are the friction. When several logs fire, or when the same log runs repeatedly, matching output to source becomes guesswork. Console Ninja collapses that loop by rendering the value in the editor gutter or inline, on the same line as the console.log call.

How it works in practice

The extension hooks into your running JavaScript or TypeScript process and streams log values and runtime errors back to VS Code, where they are anchored to the originating source location.

  • Input: your existing console.log calls and any runtime errors thrown by the running app.
  • Action: Console Ninja captures that output and maps it to the source line.
  • Expected result: the logged value or error appears next to the code, so you read it without leaving the editor.

Because it reuses console.log rather than a proprietary API, you generally do not need to rewrite logging statements to get inline output.

Who it is for

You are… Console Ninja is useful if…
A front-end developer debugging in VS Code You want log values visible without opening browser DevTools
A Node.js/TypeScript developer You want runtime errors surfaced at the throwing line
Someone who logs frequently while iterating You want to correlate repeated logs to their source quickly
A developer who rarely uses console.log The benefit is smaller; your existing debugger may suffice

Free vs Pro

The extension ships as a free VS Code extension, and the site links to a separate Pro features page. The available material confirms a free tier and a distinct Pro tier but does not list specific Pro capabilities here. If your decision depends on which features are gated, check the Pro page directly rather than assuming a particular feature is free.

When it is not the right tool

  • You need full step-through debugging with breakpoints, call stacks, and watch expressions — a debugger is the better fit, and Console Ninja is complementary rather than a replacement.
  • You work outside VS Code — the extension is VS Code-specific.
  • Your logs come from a language or runtime the extension does not instrument.

Getting started

  1. Install the Console Ninja extension from the VS Code Marketplace.
  2. Open a JavaScript or TypeScript project and start your app as usual.
  3. Add or keep a console.log statement and trigger the code path.
  4. Look next to the source line for the output; if nothing appears, confirm the app is actually running and that the extension has attached to the process.

The main thing to verify is that the running process is the one Console Ninja is watching — a common reason inline output does not show up is that the app was started before the extension attached, or a different process is serving the code.