JavaScript Tools

Working with an unfamiliar script is a sequence, not a single step: decode it, format it, check that it parses, run a tiny probe, read what it does. Most online tools make each of those a separate page and a separate paste. Here they share one editor with one input, consistent settings, and a history of what you have looked at. The language switcher at the top behaves the same way across HTML, CSS, JavaScript, and JSON, so the tools work identically rather than being four unrelated interfaces.

JavaScript is the one language where pasting into an online tool is genuinely risky in both directions. Your own code may be proprietary or contain configuration you would rather not hand to a third party, and code you are investigating may be actively hostile. Running everything client-side answers both concerns: nothing you paste leaves the tab, and nothing you paste is executed. You can confirm it by disconnecting from the network after the page loads — every tool keeps working.

Seven things in one editor. Format and minify are opposites you will use constantly — one makes code readable, the other makes it small. Strip comments tidies a file without reformatting it. Obfuscate and deobfuscate are also a pair: one makes code harder to read, the other decodes escapes and restores structure so you can understand a script someone else scrambled. The runner executes a snippet in a sandbox and captures console output. Validate tells you whether a file parses at all.

Only in the Runner, and only inside a sandboxed iframe. Every other tool treats your input as text to be parsed and transformed — nothing is evaluated. Use Format, Minify, Obfuscate, Deobfuscate, and Validate for code you do not want to run; open Run only when you intend to execute a snippet and read its console output.

No. Everything runs in your browser as JavaScript — your code is never uploaded, never logged, and never sent to a server. You can verify that by watching the Network tab in devtools while you work, or by disconnecting from the internet after the page loads and confirming the tools still function. Nothing you paste is executed either; it is only ever parsed as text.

No. What is in the editor follows you between JavaScript tools, so you can deobfuscate a script, format it, then validate it without pasting three times. Each language keeps its own draft and history, so moving to the HTML, CSS, or JSON tools leaves your JavaScript untouched. History lives in your browser only, and you can pin entries you want to keep.