Developer Tools
Extract JS Performance Marks
Extract Performance API mark and measure calls from pasted JavaScript without running timers, executing code, fetching, bundling, or uploading source.
0 / 30,000 characters. No upload, storage, or account required.
JS Performance API extraction workflows
Use this extractor when pasted instrumentation source needs a local inventory of timing marks and measures before analytics, observability, migration, or release QA review.
Review instrumentation
Pair performance marks with Extract JS Timer Calls, Extract JS Beacon Calls, and Extract JS Fetch URLs.
Audit release signals
Compare timing labels with Extract JS Error Messages, Extract JS Console Statements, and JavaScript Formatter.
Clean copied output
Send extracted labels to Remove Duplicate Lines, Sort Lines, or Normalize Whitespace.
Quick answer
Extract JS Performance Marks is a browser-based extract JS Performance marks for checking copied developer data such as payloads, URLs, encoded values, identifiers, snippets, or logs without sending the input to a server.
- Primary task
- extract JS Performance marks
- Processing
- Runs on copied snippets in your browser; no account or saved input.
- Workflow
- Developer Data Toolkit
What this tool does
Extract JS Performance Marks scans pasted JavaScript as text, lists performance.mark, performance.measure, clearMarks, and clearMeasures calls with literal labels when present, removes duplicate rows, and runs locally in your browser.
Common use cases
Extract Performance API mark and measure calls from pasted JavaScript, TypeScript, instrumentation snippets, tests, or copied browser source before timing, analytics, migration, or release QA review.
Use Extract JS Performance Marks 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, browser snippets, tests, or copied source that may contain this browser API behavior.
- Choose whether duplicate API rows should be removed and whether extracted text should be normalized for comparison.
- Review API usage with source-line context, then copy the list for QA, migration tickets, documentation, release notes, or 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
This extractor runs locally in your browser. Your pasted code is not uploaded, executed, rendered, fetched, bundled, stored, logged, or used to trigger browser behavior.
FAQ
These answers focus on copied-snippet workflows, safe sample data, validation boundaries, and what to check before moving output into code, APIs, docs, or tickets.
3 focused answers for this page
Does Extract JS Performance Marks create performance entries?
No. It scans pasted source text locally and does not execute JavaScript, call performance APIs, create browser timing entries, upload, store, or log snippets.
Which Performance API calls are included?
It finds performance.mark, performance.measure, performance.clearMarks, and performance.clearMeasures calls and includes literal labels when present.
When is this useful?
Use it while auditing browser APIs, migration notes, release QA handoffs, documentation, or source inventories without running pasted code.