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Cookie and Set-Cookie Header Inspector
Inspect Cookie pairs or one Set-Cookie field while retaining raw attributes and duplicates.
Explicit text fields
cookie-field.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
This tool needs JavaScript. If it does not load, refresh the page and try again.
How to use this tool
- Choose Cookie or one Set-Cookie field value and enter only that supplied ASCII value.
- Select Inspect cookie field. Semicolons frame pairs/attributes; response Expires commas remain raw attribute data.
- Download cookie-field.json for every original pair/attribute span, duplicate and recognized-name flag.
Examples
a=1; Path=/; Secure in Set-Cookie mode retains the first cookie and both ordered attributes.
Limitations
- At most 65536 UTF-8 bytes/UTF-16 units, 1000 cookie pairs, 256 attributes and 8192 units per value; 2 MiB report and 30 seconds.
- One supplied ASCII field value; controls and invalid cookie pairs, including malformed pair quoting, are refused. Raw response attribute values and duplicates remain inert; accidentally combined fields cannot be universally detected.
- No decoding, cookie jar, storage access, expiry/domain/SameSite decision or security judgment.
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