JWK and JWKS Viewer

Paste JWK or JWKS JSON to view key type, use, key ID, algorithm and expiry for each key.

Runs in your browser. Nothing is uploaded — your input is processed on this device and discarded when you close the tab.

JWK or JWKS JSON (public keys only)

How to use this tool

Enter your values in the fields above.
Press Generate to see the result.
Use Load sample to try the worked example, Copy result to copy it, or Clear to start again.

A JWKS with one RSA signing key, kid demo-1 and alg RS256 is shown as one parsed key with those details.

This tool only reads JSON you paste. It does not fetch keys from any account or server. Never paste a private key or a real production secret here.

Should I paste private keys?

No. This viewer is for public key details only; keep private keys out of any web page.

What about expiry?

If a key carries a numeric exp value, its date is shown; otherwise expiry is simply not stated.

Format, validate, minify, query and compare JSON in your browser, with precise line-and-column errors.

Live

Test patterns against sample text with match highlighting, capture groups and a safe one-second timeout.

Live

Check HSTS, CSP and other security headers, TLS details, and DNS/email authentication records (SPF, DKIM, DMARC).

Live