JWT Analyzer & Security Checker
Decode, Verify & Audit JWT tokens directly in your browser.
JWT Analyzer & Security Checker launched on June 5, 2026 with 2 votes.
What it does
Decode, verify, and security-audit JWTs locally in your browser. Features risk scoring, signature verification (HS256/384/512, RS256/384/512, PS256/384/512), timeline analysis, and weak secret testing. 100% offline - no data leaves your browser.
Decode, verify, and security-audit JWT tokens directly in your browser. No server processing, no data storage, complete privacy. RSA-PKCS#1 with SHA-256/384/512. Requires public key in PEM format. RSA-PSS with SHA-256/384/512. Requires public key in PEM format. ECDSA requires DER-to-raw signature conversion not implemented. Note: All cryptographic operations run in your browser using the Web Crypto API. No tokens, keys, or secrets are transmitted to any server. Never use alg: "none". Prefer RSA algorithms (RS256/384/512 or PS256/384/512) over HS256 when asymmetric key management is feasible. Use short-lived access tokens (15 minutes to 1 hour) and longer-lived refresh tokens with rotation.…from securitywall.co
Does a similar job
all alternatives →- JIJwt.is – JSON Web Token Debugger2023 · ▲38
The team at Rownd is excited to announce https://jwt.is, an updated take on JSON Web Token debugging. Like most developers, we've used jwt.io for years, but it lacks a number of useful features that would make it even more convenient. We're building on the shoulders of those who've come before us. :-) In addition to the basic JWT decoding and signature verification, we've added things like: - Verification using JWK endpoints - Locally stored history of tokens and keys - Verification for EdDSA signatures - Detection of common token providers (e.g., Google, Apple, etc) - Dark mode!…
JSON Web Token (JWT) Debugger by Rownd2023 · jwt.is · ▲97Next-generation JWT debugger (with ChatGPT)
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