HTTP Header Viewer
Parse raw HTTP headers into a cleaner key-value list for faster debugging.
Key-value parsing
Invalid line highlighting
Readable browser-first layout
Raw headers
Paste header lines from devtools, logs, or an API client.
Parsed headers
Invalid lines are marked so you can clean them up quickly.
content-typeapplication/jsonValid
cache-controlno-storeValid
authorizationBearer demo-tokenValid
Common use cases
- Cleaning copied header blocks from devtools
- Reviewing auth, cache, or content headers quickly
- Sharing readable header lists with teammates
FAQ
Does this send headers to a server?
No. Parsing happens locally in the browser, which is helpful when the header block contains sensitive details.
Can it spot malformed lines?
Yes. Lines without a standard colon separator are marked so you can clean them up more quickly.
More guides