Developer Tools
Extract JS Variable Names
Extract JavaScript variable names from pasted source snippets without executing, rendering, fetching, or uploading code.
0 / 30,000 characters. No upload, storage, or account required.
JS variable extraction workflows
Use this extractor when pasted source needs a browser-local inventory of variable names before renaming, lint cleanup, documentation, or migration work.
Audit naming patterns
Pair variable names with Extract JS Function Names, Extract JS Export Statements, and Case Converter.
Review source cleanup
Use Extract JS Console Statements, Extract JS TODO Comments, and JavaScript Formatter.
Clean copied output
Send extracted names to Remove Duplicate Lines, Sort Lines, or Word Frequency Counter.
What this tool does
Extract JS Variable Names scans pasted JavaScript as text, lists const, let, and var names with source lines, dedupes repeated names, and runs locally in your browser.
Common use cases
Extract JavaScript const, let, and var variable names from pasted source snippets, test files, React components, Node modules, or copied code before naming audits, refactors, cleanup, documentation, or migration handoffs.
Use Extract JS Variable Names 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 JavaScript, TypeScript, component snippets, test files, or copied source that contains variable declarations.
- Choose whether duplicate variable names should be removed and whether names should be normalized for comparison.
- Review extracted variable names with line numbers, then copy the clean list for refactors, naming audits, documentation, or cleanup 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 Variable Names runs locally in your browser. Your pasted code is not uploaded, rendered, fetched, bundled, executed, stored, or logged.
FAQ
Does Extract JS Variable Names run JavaScript?
No. It scans pasted JavaScript as text and does not execute code, evaluate modules, fetch assets, upload, store, or log snippets.
Which variable names are included?
It finds common const, let, and var declaration names in pasted JavaScript or TypeScript snippets. It is designed for quick source inventories, not full AST parsing.
When is this useful?
Use it while reviewing naming patterns, preparing refactors, documenting copied modules, cleaning component snippets, or checking migration notes.
Explore more tools
Browse the Developer Tools hub or continue with the Developer Data Toolkit when this task is part of a larger workflow.