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jwt.io is the go-to JWT decoder for developers. But for security testing, you need more — attack templates, security ratings, token comparison, and a CLI. Payload Playground is a JWT tool built for pentesters.
| Feature | Payload Playground | jwt.io |
|---|---|---|
| JWT Decode & Inspect | ||
| Signature Verification | HS256/384/512 | Multiple algorithms |
| JWT Attack Templates | 5 attack types | |
| JWT Builder (create tokens) | Edit only | |
| Compare Tab (diff tokens) | ||
| Security Ratings | ||
| Claim Statistics | ||
| CLI Support | ||
| JWT Attacks Cheat Sheet | ||
| No Ads or Clutter | Has library ads | |
| 100% Client-Side |
None algorithm bypass, algorithm confusion (RS256 to HS256), claim tampering, key injection (jwk/jku), and signature stripping. jwt.io only decodes — Payload Playground helps you test.
Diff two tokens side by side to spot changes. Build new tokens from scratch with custom headers, payloads, and signing. jwt.io only lets you edit existing tokens.
Get an instant security assessment of any JWT — algorithm strength, expiration status, claim analysis. Plus visual claim statistics jwt.io does not provide.
Generate JWT payloads from your terminal with the CLI tool. Reference the JWT attacks cheat sheet for common exploitation techniques during pentests.
Decode, build, verify, compare, and attack JWTs
Generate JWT attack payloads with custom claims
Copy-ready JWT exploitation techniques
Base64, URL, Hex encoding for JWT manipulation
XSS, SQLi, SSTI, SSRF, reverse shells, and more
Generate JWT payloads from your terminal