DexartTools
JavaScript & Frontend Ready to use

Type Box Annotation Card

Paste a mixed-type array and get union annotation with narrowing helpers.

How to use

  1. 1Open the Type Box Annotation Card tool page.
  2. 2Enter or paste your input into the provided fields.
  3. 3The tool processes your input instantly in your browser.
  4. 4Copy or download the result using the buttons provided.

Privacy & limitations

  • Processing happens locally in your browser — nothing is uploaded.
  • Works on modern desktop and mobile browsers.
  • Very large inputs may take a moment; the interface will show progress.

Support

Found a bug or want an improvement? We read every report.

Report a problem

Related tools

JavaScript Formatter

Formats JavaScript source with readable indentation.

JavaScript & Frontend

JavaScript Minifier

Removes unnecessary whitespace and comments from JavaScript.

JavaScript & Frontend

JavaScript Syntax Checker

Uses browser parsing to detect syntax errors in supplied JavaScript.

JavaScript & Frontend

JavaScript Comment Extractor

Collects comments from JavaScript source for review.

JavaScript & Frontend

JavaScript Function Indexer

Lists function declarations and named function expressions.

JavaScript & Frontend

JavaScript Import Mapper

Extracts import and export statements from JavaScript modules.

JavaScript & Frontend

JavaScript Duplicate Line Finder

Finds repeated nonblank lines in JavaScript source.

JavaScript & Frontend

JavaScript String Escape Helper

Escapes text for common JavaScript string contexts.

JavaScript & Frontend