Free developer tools
For debugging web apps. Each one runs in your browser, so nothing you open or paste is uploaded.
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HAR file viewer
Open a .har file and see every request on a timeline, failed ones first, each copyable as cURL.
Open HAR file viewer -
JWT decoder
Paste a token, or a header or cURL command with one in it, to read its claims, check expiry and verify the signature.
Open JWT decoder -
Browser and screen info
See your browser, system, screen resolution and window size, and copy them for a bug report.
Open Browser and screen info
Debug what your users
actually hit
Add the extension, record a bug, send the link. Your team or your coding agent takes it from there.
Free for up to 3 members14-day Team trial, no card needed