Developer Tools
Extract JS Function Names
Extract JavaScript function declarations and arrow-function variable names from pasted code without executing, rendering, fetching, or uploading source.
0 / 30,000 characters. No upload, storage, or account required.
JS function-name extraction workflows
Use this extractor when pasted source needs a quick browser-local inventory of declared functions before code review, documentation, migration, or cleanup.
Map source utilities
Pair function names with Extract JS Import Statements, Extract JS Console Statements, and JavaScript Formatter.
Prepare reviews
Use Regex Match Extractor, Extract CSS Classes, and Extract Data Attributes when reviewing component output.
Clean copied output
Send extracted names to Remove Duplicate Lines, Sort Lines, or Normalize Whitespace.
What this tool does
Extract JS Function Names scans pasted JavaScript as text, lists function names with source lines, removes duplicate rows, and runs locally in your browser.
Common use cases
Extract JavaScript function declarations and arrow-function variable names from pasted source snippets, utility modules, React components, Node files, or copied code before code review, documentation, migration, cleanup, or refactoring handoffs.
Use Extract JS Function 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, framework snippets, Node modules, test files, or copied source that contains the rows you want to audit.
- Choose whether duplicate rows should be removed and whether values should be normalized for comparison.
- Review extracted rows with source lines, then copy the clean list for code review, migration cleanup, release checks, or documentation 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 Function Names runs locally in your browser. Your pasted code is not uploaded, rendered, fetched, bundled, executed, stored, or logged.
FAQ
Does Extract JS Function Names execute JavaScript?
No. It scans pasted JavaScript as text and does not execute code, evaluate modules, fetch assets, upload, store, or log snippets.
Which function names are included?
It finds named function declarations and common const, let, or var arrow-function assignments in pasted JavaScript or TypeScript.
When is this useful?
Use it while inventorying utility functions, reviewing copied modules, preparing refactors, documenting source snippets, or checking code cleanup tasks.
Explore more tools
Browse the Developer Tools hub or continue with the Developer Data Toolkit when this task is part of a larger workflow.