HTTP header reference
More than two hundred headers, searchable, with common values and security notes. The same database the API studio autocompletes from.
Open the toolSmall tools, no account, nothing uploaded
Each one runs entirely in your browser and reuses data the product already ships. More will be added when they are genuinely useful, not when they are easy.
JSON validator and formatter
Validate, format and minify JSON with the exact position of the first error. Runs entirely in your browser.
Open the toolThe full studio is free to start too
The Free plan includes the test recorder, API testing with 1,000 calls a month and ten security scans, with no time limit and no card.