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Odelvo
Browser tool Runs locally

JavaScript Tools

Format, minify, validate, diff, escape, and convert JavaScript in your browser.

Tools

Formatter vs. Minifier vs. Validator

All three parse your code with the same ECMAScript parser, but they answer different questions. JavaScript Validator only tells you whether the syntax is valid and where it breaks if not, use it for a quick check with nothing else touched. JavaScript Formatter rewrites the source with consistent indentation for reading or code review. JavaScript Minifier strips whitespace and comments to reduce file size for shipping to a browser. Both Formatter and Minifier validate as a side effect, since neither can process syntax that doesn't parse.

Minification isn't obfuscation

Removing whitespace and comments makes code smaller, not harder to understand, a formatter run puts the readable structure right back in seconds. Minifying is a size optimization for production delivery, not a way to hide logic, protect an algorithm, or keep secrets out of client-side code. Anything sent to the browser, minified or not, is visible to whoever opens dev tools.

JavaScript Object → JSON isn't the same parser as JSON

JavaScript Object → JSON accepts things strict JSON doesn't, unquoted keys, single-quoted strings, trailing commas, and comments, because it's parsing a JS object literal, not a JSON document. It converts what it can represent in JSON and rejects the rest: function values, computed keys, spread syntax, and references to variables have no literal value at parse time, so they're reported as errors rather than dropped or guessed at.

What these tools don't do

The Validator checks syntax, not behavior, it won't catch an undefined variable, a wrong argument count, or a logic bug, since none of those are visible until the code actually runs. Nothing here executes your JavaScript at any point. The parser also only understands standard ECMAScript: TypeScript's type annotations and JSX markup will be reported as parse errors, not stripped or interpreted, so strip that syntax first if you're working from a .ts or .tsx file.

Frequently asked questions

Should I use the Formatter, Minifier, or Validator?
Validator checks syntax only and reports the first error location, useful for a fast pass/fail with nothing else changed. Formatter re-indents source for reading or reviewing. Minifier strips whitespace and shortens what it safely can to reduce file size for shipping. Formatting and minifying both validate as a side effect, since they can't process invalid syntax.
Does JavaScript Validator catch bugs, not just typos?
No. It only checks that the source parses as valid ECMAScript. Undefined variables, wrong argument counts, type mismatches, and logic errors are all invisible to a syntax check; those need a linter, type checker, or the code actually running.
Is minified code obfuscated or secure?
No. Minification removes whitespace and comments and shortens some names to reduce size, it does not hide logic or prevent inspection. Any minified file can be reformatted straight back into readable code. Don't rely on it to protect secrets or business logic.
Why does JavaScript Object → JSON reject my object?
It only converts literal data: strings, numbers, booleans, null, arrays, and plain object literals. Function values, computed keys, spread syntax, and identifiers that reference variables have no fixed value at parse time, so they're rejected rather than guessed at or silently dropped.
Can I paste TypeScript or JSX into these tools?
No. The parser handles standard ECMAScript only. Type annotations, generics, and JSX syntax will be reported as a parse error rather than stripped or interpreted.