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QA & Debugging

7 free browser-based tools

HAR, logs, stack traces, regex, headers and API response inspection

All QA & Debugging

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Analyze HAR JSON for slow requests, status codes, transferred bytes and timing bottlenecks.

Compare two JSON API contracts or schemas and summarize added, removed and changed paths.

Inspect pasted HTTP headers for security, cache, content, cookie and CORS signals.

Summarize log levels, timestamps, errors and repeated messages from plain or logfmt logs.

Format stack traces into readable frames with file, line and function hints.

Test JavaScript regex patterns and flag risky nested quantifiers before using them on large input.

Inspect JSON API responses for types, paths, nulls, arrays and validation-ready structure.