Private JavaScript tools that never run your source

Format, minify, check syntax, explore AST nodes, inventory imports and exports, inspect scopes, rename bindings, escape strings, and measure complexity locally.

Every job runs in a disposable browser worker without evaluation.

Choose a JavaScript job

Each route has a distinct formatting, parsing, static-analysis, or encoding contract.

JavaScript FormatterNormalize layout with Prettier after a strict standard-ECMAScript parse.Open tool

JavaScript MinifierRemove comments and unnecessary layout while preserving identifier names and disabling compression.Open tool

JavaScript Syntax CheckerReturn a valid or invalid parser result without evaluating any expression or statement.Open tool

JavaScript AST ExplorerInspect node types, parent links, source ranges, lines, and concise node details.Open tool

JavaScript Import AnalyzerReport static imports and dynamic import expressions exactly as syntax, without resolution.Open tool

JavaScript Export AnalyzerList declared exports, aliases, defaults, wildcard exports, and re-export sources.Open tool

JavaScript Scope AnalyzerMap parser-derived scopes to their own bindings, references, and constant violations.Open tool

JavaScript Identifier RenamerRename one lexical binding and its references after selecting its declaration location and rejecting collisions or capture risks.Open tool

JavaScript String EscaperEncode text as one quoted JavaScript literal without parsing or executing it.Open tool

JavaScript Complexity AnalyzerCount branch decisions and maximum decision nesting for the program and each function.Open tool

Start with a syntax check

Confirm that standard ECMAScript parses under the intended source grammar before analyzing or transforming it.

Syntax report

Submit the example or replace it with your own input. Source is parsed but never executed.

A parse-only workspace

JavaScript text can describe arbitrary behavior. These tools inspect its syntax and bindings without invoking that behavior.

Inputs are limited to 256 KiB, outputs to 1 MiB, trees to 30,000 nodes and 256 levels, and reports to 10,000 rows.

JSX, TypeScript, Flow, and proposal-only syntax are excluded so the contract remains standard ECMAScript.