Do I really have to copy every link from my code into my API tool?
RouteLens: No. RouteLens reads your project and lists every route for you, ready to send.
RouteLensPreview
Test your whole API in one click.
RouteLens is a free VS Code extension that reads your project, finds every API route and tests it for you. No copying links, no writing requests by hand, no setup.
- Free and open source
- Your code never leaves your computer
- Works with Next.js and Express
Demo
See it in action
Five steps, about a minute. Click any step to jump to it.
Step 1 of 5: Open your project. Open any Next.js or Express project in VS Code. RouteLens finds where your API runs on its own, and tells you how it knew.
How it works
Open. Click. Done.
No setup files, no terminal, nothing to configure.
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Open
Open your project in VS Code. RouteLens finds your API and every route in it.
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Click
Press Test everything. Every route gets checked in one go.
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Done
See what works and what doesn't, right next to the code that handles it.
Sound familiar?
If you've ever wondered…
What should I put in the request body?
RouteLens: RouteLens fills in sample data that already follows the rules your code expects.
Is there a quick way to check that my change didn't break anything?
RouteLens: Save the file. RouteLens tests that route again and shows a tick or a cross in a second or two.
How do I test routes that need me to log in?
RouteLens: RouteLens notices, asks for your login once, keeps it in your computer's secure keychain and handles the rest.
My API isn't running. Do I need to open a terminal?
RouteLens: No. RouteLens offers to start it for you, waits until it's ready and sends the request again.
Can my AI assistant test my API for me?
RouteLens: Yes. Copilot, Claude Code and Cursor can run your tests through RouteLens, read what failed and fix it.
Features
Everything it does for you
The boring parts of testing an API, handled. You keep building.
Zero setup
Finds where your API runs, from your project's own settings, and tells you which clue it used.
Finds every route
Lists every API route in your project in its own sidebar, even when they're spread across many files.
Ready-made requests
Writes a request for every route, with sample data that fits. When your code changes, they follow.
One-click testing
Test everything runs every route and shows a simple scoreboard: how many passed, how many failed.
Tests again when you save
Change a route, save the file, and see the new result next to it in a second or two.
Starts your server
If your app isn't running, one click starts it, waits for it, and tries again.
Logs in for you
Asks for your login once, keeps it safe in your keychain, and reuses it wherever it's needed.
Works with your AI
Copilot, Claude Code and Cursor can test your API through RouteLens and fix what breaks.
Private by design
Reads your code without running it, sends nothing anywhere, and has no tracking at all.
Install
Up and running in two minutes
RouteLens is on the VS Code Marketplace. Install it in one click, open your project and test every route.
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Install it from the Marketplace
In VS Code, open the Extensions panel, search for “RouteLens API Client” by harshdazz and click Install. Or open its Marketplace page and install it from there.
Get it on the Marketplace - 2
Open your project
Open a Next.js or Express project. RouteLens finds your API by itself, with nothing to set up.
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Click Test everything
Click the RouteLens icon in the side bar, then Test everything, and watch the results come in.
That's it. Open any route file and you'll see Send above each route.
Also on npm
Run your saved tests in a terminal or CI
npx @routelens/cli runGive any MCP agent the RouteLens tools
npx -y @routelens/mcp --root .
FAQ
Questions
What is RouteLens?
RouteLens is a free extension for VS Code that tests your API for you. It reads your project, finds every route, prepares a request for each one and checks them all in one click, showing the result right next to your code.
Is it free?
Yes. RouteLens is free and open source under the MIT license, and the full source is on GitHub.
Does it upload my code anywhere?
No. RouteLens reads your code on your own computer and never runs it. It sends nothing anywhere except the requests you, or your AI assistant, choose to run, and there is no tracking.
Which projects does it work with?
Next.js (both kinds of API routes) and Express, including larger projects where routes are split across many files. Support for more frameworks is planned.
Do I need AI to use it?
No. Everything works without AI. If you already use Copilot, Claude Code or Cursor, RouteLens lets them test and fix your API too, and it keeps them to safe addresses only.
Will it change my code?
RouteLens itself never edits your code. It keeps its own files in a .routelens folder in your project, which you can share with your team. Code changes only happen when you, or an AI assistant you asked, make them.
Can I use it in Cursor or VSCodium?
Yes. RouteLens is on Open VSX, the store Cursor and VSCodium use. Open the Extensions panel, search for “RouteLens API Client” and click Install. If your editor doesn't use Open VSX, download the latest .vsix file from the GitHub releases page, click the ⋯ menu at the top of the Extensions panel and choose “Install from VSIX…”.
Built by
Harsh Dubey
Full-stack AI developer. I built RouteLens to take the repetitive part out of testing an API, so you can spend that time building.
Stop copying links into your API tool.
Let RouteLens read your code and test it for you.