JavaScript Validator
FreeLint and validate JavaScript code for syntax errors
About JavaScript Validator
Shipping JavaScript with a syntax slip means a broken bundle, a blank page, or a console full of errors your users see first. The JavaScript Validator from ToolHub by Codaiman lints and parses your code to catch syntax errors and common mistakes before they ever reach a runtime.
Paste a snippet or a whole module and the tool analyzes it, reporting unmatched brackets, invalid statements, and other problems with the line context needed to fix them fast. It is a quick way to sanity-check a function, a build artifact, or code pasted from somewhere unfamiliar without spinning up a project or a linter locally. Everything runs in your browser with no account required, so your code stays private while you get instant, actionable feedback at no cost.
Common uses
- Sanity-checking a function or snippet before pasting it into a project
- Catching a syntax error in a build output or minified file that fails to load
- Validating code copied from documentation, a gist, or a forum answer
- Quickly linting JavaScript on a machine where you have no editor or toolchain set up
- Spotting missing brackets or stray characters that crash a script at parse time
How to use
- 1
Configure options
Set your preferences using the options panel below.
- 2
Click Generate
Click the process button to generate your result instantly.
- 3
Copy or download
Copy the result to clipboard or download it directly to your device.
Why ToolHub?
- Instant error detection
- Detailed error messages
- Standards compliant
FAQ
Does it run my JavaScript?
No. The tool parses and lints your code statically to find errors. It does not execute it, so it is safe to paste any script.
Does it support modern ES syntax?
Yes, modern JavaScript including arrow functions, classes, and modules is parsed. Validate compiled output for TypeScript or experimental syntax.
Will it catch logic bugs?
It focuses on syntax and common structural mistakes, not runtime logic. A clean result means the code parses, not that it behaves correctly.
Is my code kept private?
Yes. Linting runs in your browser, so your JavaScript is never uploaded or stored.
Can I use JavaScript Validator on mobile?
Yes — ToolHub is fully responsive and works on iPhone, Android, tablets and all modern browsers. No app install needed.