Developer Tools
Extract JS postMessage Targets
Extract postMessage targetOrigin strings from pasted JavaScript without sending messages, rendering frames, executing code, fetching URLs, or uploading source.
0 / 30,000 characters. No upload, storage, or account required.
JS postMessage target extraction workflows
Use this extractor when pasted iframe, embed, or widget source needs a local inventory of postMessage target origins before trust-boundary and release QA review.
Audit embed boundaries
Pair postMessage targets with Extract Iframe Sources, Extract JS Event Listeners, and Extract JS Error Messages.
Review source safely
Use Extract JS DOM Selectors, Extract JS Function Names, and JavaScript Formatter.
Clean copied output
Send extracted origins to Remove Duplicate Lines, Sort Lines, or Normalize Whitespace.
Quick answer
Extract JS postMessage Targets is a browser-based extract JS postMessage targets 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 postMessage targets
- Processing
- Runs on copied snippets in your browser; no account or saved input.
- Workflow
- Developer Data Toolkit
What this tool does
Extract JS postMessage Targets scans pasted JavaScript as text, lists literal postMessage target origins, removes duplicate rows, and runs locally in your browser.
Common use cases
Extract postMessage targetOrigin strings from pasted JavaScript, TypeScript, iframe widgets, embed snippets, tests, or copied source before trust-boundary, security, migration, or release QA review.
Use Extract JS postMessage Targets 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, iframe snippets, widget source, tests, or copied code that may call postMessage.
- Choose whether duplicate target origins should be removed and whether extracted text should be normalized for comparison.
- Review postMessage target origins with source-line context, then copy the list for iframe, embed, security, migration, or release 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 send postMessage events.
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 postMessage Targets send browser messages?
No. It scans pasted source text locally and does not execute JavaScript, render iframes, send postMessage events, upload, store, or log snippets.
Which postMessage values are included?
It finds literal targetOrigin arguments in postMessage calls, including exact origins and wildcard targets, so embed boundaries can be reviewed.
When is this useful?
Use it while auditing iframe widgets, embed integrations, trust boundaries, migration notes, or release QA handoffs.