Online Linters

What It Does

Provides an integrated environment powered by Monaco Editor to write, paste, and lint code directly in your browser. Supported languages include JSON, YAML, JavaScript, and Markdown. It catches syntax errors, formatting issues, and quality violations.

Why It Matters

Catching syntax errors before committing or deploying can save countless hours of debugging. Especially useful for configuration files (YAML, JSON) where a stray comma or bad indent breaks the whole pipeline.

How To Use

• Select the target language from the toolbar.
• Paste the content to check into the editor.
• Real-time markers will show errors and warnings. You can also manually trigger a format or specific linter checks.

Where It Saves You

• CI configs: a bad indent in a GitHub Actions or Kubernetes YAML file fails the pipeline ten minutes after you push. Paste it here first and the error shows up instantly, with the exact line marked.
• API payloads: that JSON response which "should work" often hides a trailing comma or an unescaped quote. The editor points at it instead of leaving you to eyeball 300 lines.
• Quick edits: tweak a JavaScript snippet or a Markdown README section without opening a project — Monaco is the same editor engine VS Code uses, so the highlighting and error squiggles feel familiar.

Your Code Stays In The Browser

The editor, the parsers, and the lint rules all run client-side. Nothing you paste is sent to a server — which matters when the config you're debugging contains internal hostnames or code you can't share. Still, don't paste live secrets anywhere. Including here.

FAQ

Which languages are supported?

JSON, YAML, JavaScript, and Markdown. Pick one from the toolbar and the editor switches its highlighting and checks to match.

Is this the same as my project's linter?

No — it catches syntax errors and common quality issues, but it doesn't read your project's config files. Treat it as a fast pre-check, not a replacement for the linters in your CI.

Can it format my code?

Yes. Hit the Format button in the toolbar and the editor reformats the current document in place.