Critical Request Chain Visualizer

Find the longest chain in pasted request data.

Runs in your browser. Nothing is uploaded — your input is processed on this device and discarded when you close the tab.

Requests (one per line: name, duration in ms, depends on — blank if none)

How to use this tool

Enter your values in the fields above.
Press Generate to see the result.
Use Load sample to try the worked example, Copy result to copy it, or Clear to start again.

The sample chain index.html (100 ms) then app.js (300 ms) then api-data (200 ms) totals 600 ms, which is the longest chain in the data.

This analyzes request lists you paste. It does NOT measure a live site or trace real network requests; it works only on the data you give it.

How do I write a dependency?

Put the name of the request it waits for in the third column, exactly as written on its own line.

What if a request has no dependency?

Leave the third column blank. It starts its own chain.

Format, validate, minify, query and compare JSON in your browser, with precise line-and-column errors.

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Test patterns against sample text with match highlighting, capture groups and a safe one-second timeout.

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Check HSTS, CSP and other security headers, TLS details, and DNS/email authentication records (SPF, DKIM, DMARC).

Live