Advanced JS Studio

Analyze JavaScript deeply with AST explorer, dependency and dead-code insights, tree-shaking checks, source map inspection, security lint, and benchmark harness generation.

Advanced ModeOpen Full Js Workspace Jump to Core Tool

Advanced JS Studio Input

AST Explorer + Visual Tree

Parsed node preview: 82 nodes sampled

Program [0, 377]

ImportDeclaration [0, 26]

ImportDeclaration [27, 60]

ExportNamedDeclaration [62, 377]

ImportDefaultSpecifier [7, 11]

Literal [17, 25]

ImportSpecifier [36, 41]

Literal [49, 59]

VariableDeclaration [69, 377]

Identifier [7, 11]

Identifier [36, 41]

VariableDeclarator [75, 376]

Identifier [75, 78]

ArrowFunctionExpression [81, 376]

Identifier [82, 87]

BlockStatement [92, 376]

IfStatement [96, 144]

VariableDeclaration [147, 173]

ForStatement [176, 359]

ReturnStatement [362, 374]

Literal [100, 105]

BlockStatement [107, 144]

VariableDeclarator [153, 172]

VariableDeclaration [181, 190]

BinaryExpression [192, 207]

UpdateExpression [209, 212]

BlockStatement [214, 359]

Identifier [369, 373]

ExpressionStatement [113, 140]

Identifier [153, 157]

CallExpression [160, 172]

VariableDeclarator [185, 190]

Identifier [192, 193]

MemberExpression [196, 207]

Identifier [209, 210]

ForStatement [220, 355]

CallExpression [113, 139]

Identifier [160, 165]

Identifier [166, 171]

Dependency Graph Analyzer

Detected modules: 2

• ./util

• ./parser

No obvious circular re-export pattern detected.

Dead Code Detector

• Line 5: constant false condition

• Potential unused symbol: run

Tree-Shaking Readiness Checker

Looks tree-shaking friendly based on basic checks.

Runtime Cost Profiler (Heuristic)

Cost score: 63

Loops: 2 • Nested loop risk: yes • Array chains: 0 • Heavy allocations: 0

Regex / URL / Date API Risk Scanner

No major API risk patterns detected.

Security Lint Pack

No high-risk security signatures detected.

Source Map Inspector

Version

File

bundle.js

Sources / Names

2 / 2

Mappings length

Inline sources

Module Format Converter (ESM ↔ CJS)

Snippet Benchmark Harness

<!doctype html>
<html>
<head><meta charset="utf-8" /><title>JS Benchmark Harness</title></head>
<body>
<script>
const benchmarkTarget = () => {
import util from './util';
import { parse } from './parser';

export const run = (input) => {
  if (false) {
    console.log('dead branch');
  }
  const data = parse(input);
  for (let i = 0; i < data.length; i++) {
    for (let j = 0; j < data.length; j++) {
      if (new Date(data[i]).getDay() === 0) {
        console.log(util(data[j]));
      }
    }
  }
  return data;
};
};
const ITERATIONS = 10000;
const start = performance.now();
for (let i = 0; i < ITERATIONS; i++) benchmarkTarget();
const end = performance.now();
console.log(`Total: ${(end - start).toFixed(3)}ms`);
console.log(`Average: ${((end - start) / ITERATIONS).toFixed(6)}ms per run`);
</script>
</body>
</html>

All JavaScript processing runs locally in your browser. No code uploads.

About Advanced JS Studio

A JavaScript development environment on your computer. The Advanced JS Studio combines code editing, real-time execution, console output, and formatting tools into a single workspace — no IDE install required, no code uploaded to servers.

Studio Features

Live Execution

Run JavaScript in real time with real-time console output. Test snippets, debug logic, and prototype ideas without context-switching.

Code Formatting

Auto-format code with consistent indentation and style. Minify for production or beautify for readability.

ES6+ Support

Full modern JavaScript syntax including arrow functions, destructuring, async/await, and module patterns.

Local Processing

All code execution happens in a sandboxed browser environment. Source code never leaves your device.

Need to validate code before running? Use JS Validator for syntax checking.

Frequently Asked Questions

Is my code safe in the Advanced JS Studio?

Yes. All code execution happens in a sandboxed browser environment. Your source code is never transmitted to any server — it runs entirely on your device.

Can I use npm packages in the studio?

The studio supports standard browser JavaScript. For npm packages, you can include them via CDN script tags or paste bundled code. Native Node.js modules are not available in the browser sandbox.

Will my code survive a page refresh?

No. The studio is a volatile, online environment. Copy your code or export it before closing or refreshing the tab.

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Need Help?

Check out our technical guides to learn more about how browser-side processing works.

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