JWT debuggers help you inspect and verify tokens. But not all are equal — some send your token to their servers. We compared the top options for 2025, with a focus on decode, verify, claims inspection, and privacy. Here's our breakdown.
Comparison Table
| Name | Decode | Verify Signature | Claims Inspection | Free | Privacy |
|---|---|---|---|---|---|
| DuskTools JWT DecoderRecommended | ✓ | ✓ | ✓ | ✓ | 100% client-side |
| jwt.io | ✓ | ✓ | ✓ | ✓ | May send to server |
| jwt.ms | ✓ | ✓ | ✓ | ✓ | May log server-side |
| token.dev | ✓ | ✓ | ✓ | ✓ | May process server-side |
DuskTools JWT Decoder
RecommendedA privacy-focused JWT decoder that runs 100% in your browser. Decode, inspect claims, verify signatures — no data sent to any server.
jwt.io
The popular JWT debugger by Auth0. Decode, verify, and edit tokens with a clean interface.
jwt.ms
Microsoft's JWT decoder. Simple and straightforward for Azure AD tokens.
token.dev
A modern JWT debugger with a clean UI and verification support.
Verdict
For developers who need to debug JWTs without sending tokens to third-party servers, DuskTools JWT Decoder is our top recommendation. Decode, verify signatures (HMAC and RSA), and inspect claims — all in your browser. No data leaves your device. jwt.io is a solid alternative for quick debugging, but if you're working with production tokens or sensitive claims, choose a privacy-first tool like DuskTools.
Try DuskTools JWT DecoderWhat Is a JWT Debugger?
A JWT (JSON Web Token) debugger lets you paste a token and see its decoded header and payload. Good debuggers also verify the signature (with a secret or public key), highlight expiration, and format claims for readability. Developers use them to inspect auth tokens, debug API issues, and understand token structure. Choosing a debugger that keeps your tokens private is important — JWTs can contain user IDs, roles, and other sensitive data.
Privacy: Why Client-Side Matters
JWTs often carry sensitive claims: user IDs, emails, roles, permissions. Pasting them into a tool that sends data to a server means your token could be logged or analyzed. DuskTools JWT Decoder runs entirely in your browser. Decoding and signature verification use Web Crypto — no server round-trips. Your token never leaves your device. For production debugging, that peace of mind matters.
Feature Comparison
All tools decode header and payload. Most support signature verification (HMAC, RSA). Claims inspection varies: some show raw JSON, others format common claims (exp, sub, etc.). Free tiers are common. The key differentiator is privacy: DuskTools and a few others process everything client-side. jwt.io and similar tools may send data to their servers. Our verdict: DuskTools for privacy-first debugging.
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