Playwright Trace Viewer AI Debugging Guide
Source-backed guide for using Playwright traces, screenshots, snapshots, network events, console logs, and action timelines as evidence for AI-assisted frontend debugging.
Open the source and read safety notes before installing.
Safety notes
- Browser traces can contain form inputs, cookies, URLs, screenshots, DOM text, and request metadata.
- Do not collect traces from production accounts unless test data and retention are approved.
Privacy notes
- Redact screenshots, network payloads, auth tokens, private URLs, and user content before sharing traces externally.
Prerequisites
- Playwright test suite or reproducible browser script.
- Ability to capture traces for failing UI flows.
- Local or CI access to trace archives.
Schema details
- Install type
- copy
- Reading time
- 6 min
- Difficulty score
- 49
- Troubleshooting
- Yes
- Breaking changes
- No
Full copyable content
Run Playwright with tracing on first retry, inspect the Trace Viewer, and give the AI only the failure step, console/network evidence, and expected behavior.About this resource
Why Traces Beat Guesses
When an AI assistant sees only source code, it has to infer browser state. A Playwright trace records the actual run: actions, snapshots, screenshots, console messages, network events, and timing. That makes the debugging question much smaller and more factual.
Capture Pattern
- Enable tracing on retry or for the failing project.
- Reproduce the failure in CI or locally.
- Open Trace Viewer and identify the first unexpected state.
- Extract only the relevant step, screenshot, console entry, network event, and assertion failure.
- Ask the AI to propose a patch and a verification command.
- Re-run the failing test before trusting the explanation.
What To Hand The AI
- Test name and expected user behavior.
- Failing assertion and step number.
- Screenshot or DOM snapshot description.
- Console errors and relevant warnings.
- Network failures, status codes, or missing requests.
- Any timing or actionability signal from the trace.
Troubleshooting
The trace is too large
Do not paste everything. Use the trace to select the earliest incorrect state, then provide a small evidence packet.
The failure only happens in CI
Compare CI trace video/screenshots with local traces. Device scale factor, viewport, locale, timezone, and missing seed data are common differences.
Duplicate Check
Existing entries cover Playwright testing and MCP browser automation. This guide focuses on Trace Viewer evidence packets for AI-assisted debugging.
References
- Trace Viewer - https://playwright.dev/docs/trace-viewer
- Debugging tests - https://playwright.dev/docs/debug
- Test configuration - https://playwright.dev/docs/test-configuration
Source citations
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