HARmageddon is cancelled: how we taught Playwright to replay HAR with dynamic parameters

16/01/2026 15 min
HARmageddon is cancelled: how we taught Playwright to replay HAR with dynamic parameters

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Episode Synopsis



This story was originally published on HackerNoon at: https://hackernoon.com/harmageddon-is-cancelled-how-we-taught-playwright-to-replay-har-with-dynamic-parameters.
We taught Playwright to find the correct HAR entry even when query/body values change and prevented reusing entities with dynamic identifiers.
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Playwright is a tool for mocking the network using a HAR file. HAR is a file that contains: all page requests request parameters server responses. HAR files can be used to test the network state without starting the backend.