Developer toolbox

Useful tools,
all in one place.

Developer workflow, data and API, encoding, security, automation, and cloud-native utilities — mostly browser-local.

Results for “Security”

9 tools

Developer workflow

Compare, test, inspect, and generate everyday development data.

1 tools

↗Developer

HTTP Headers, Redirect & CORS Checker

Inspect a public URL's status, redirect chain, response headers, CORS policy, caching, and common security headers with HEAD, GET, or OPTIONS.

Backend check

Security & certificates

Inspect JWTs, hashes, certificates, and cryptographic test material.

7 tools

↗Security

JWT Decoder & Expiry Checker

Decode JWT headers and claims, inspect timestamps, and check expiration locally. Decoding does not verify the signature.

Runs locally ↗Security

PEM Certificate Inspector

Inspect an X.509 PEM certificate, validity dates, subject, issuer, serial number, and SHA-256 fingerprint locally.

Runs locally ↗Security

RSA Certificate Generator & Parser

Generate a self-signed RSA X.509 certificate and parse RSA certificates or keys online. Generated material is returned once and never stored.

Backend check ↗Security

JWT HS256 / RS256 Sign & Verify

Generate and verify HS256 or RS256 JWT signatures locally, with algorithm and exp/nbf checks. Tokens and keys never leave your browser.

Runs locally ↗Security

SSL Certificate Generator for IP & Domain (PEM)

Generate a self-signed SSL/TLS certificate for a domain name or IP address with the correct Subject Alternative Name, returned as PEM certificate and private-key files.

Backend check ↗Security

TLS / SSL Certificate Checker

Inspect a public website's live TLS certificate, chain, SANs, expiry, fingerprint, protocol, cipher suite, and trust result without installing OpenSSL.

Backend check ↗Security