Developer Tools
Extract JS Type Aliases
Extract TypeScript type alias names from pasted JavaScript or TypeScript source snippets without executing, compiling, fetching, or uploading code.
0 / 30,000 characters. No upload, storage, or account required.
JS type-alias extraction workflows
Use this extractor when copied TypeScript needs a browser-local inventory of type alias names before model cleanup, API docs, or migration planning.
Audit model definitions
Pair type aliases with Extract JS Interface Names, Extract JS Class Names, and JSON to TypeScript.
Review source modules
Use Extract JS Export Statements, Extract JS Import Statements, and JavaScript Formatter.
Clean copied output
Send extracted names to Sort Lines, Remove Duplicate Lines, or Normalize Whitespace.
What this tool does
Extract JS Type Aliases scans pasted source as text, lists type alias declarations with source lines, removes duplicate names, and runs locally in your browser.
Common use cases
Extract TypeScript type alias names from pasted JavaScript or TypeScript source snippets, declaration files, API models, utility type modules, or copied code before model cleanup, documentation, refactors, migration planning, or handoffs.
Use Extract JS Type Aliases when you are working with copied API payloads, logs, encoded values, config snippets, identifiers, or debugging data and need a quick browser-local check before pasting the result into docs, tickets, tests, or another developer tool.
How to use it
- Paste TypeScript, declaration files, API model snippets, utility types, or copied source that contains type alias declarations.
- Choose whether duplicate type alias names should be removed and whether extracted names should be normalized for comparison.
- Review type alias names with source line numbers, then copy the clean list for model audits, documentation, refactors, or migration handoffs.
Example workflow
Copy a small payload or encoded value from an API response, request URL, log line, or config file. Run the focused check here, confirm the output is readable, then continue with related developer data tools such as validation, formatting, decoding, timestamp conversion, or CSV/JSON conversion.
Privacy note
Extract JS Type Aliases runs locally in your browser. Your pasted code is not uploaded, compiled, rendered, fetched, executed, stored, or logged.
FAQ
Does Extract JS Type Aliases execute TypeScript?
No. It scans pasted source as text and does not execute, compile, type-check, fetch dependencies, upload, store, or log snippets.
Which type aliases are included?
It finds common TypeScript type alias declarations, including exported aliases, in pasted source snippets. It is a lightweight text extractor, not a full AST parser.
When is this useful?
Use it while auditing utility types, comparing generated models, preparing API documentation, planning migrations, or cleaning copied declaration files.
Explore more tools
Browse the Developer Tools hub or continue with the Developer Data Toolkit when this task is part of a larger workflow.