ToolNest

🔏JWT Decoder

Decode and inspect JWT tokens.

🆓 Free🔒 Secure⚡ Instant📱 Mobile-friendly🚫 No signup

Decode and inspect JWT tokens online for free. View header, payload, and signature without a secret.

JWT Token

How to Use JWT Decoder — Step by Step

  1. 1Paste your JWT token (the full eyJ... string) into the input field
  2. 2The header, payload, and signature sections are decoded and displayed separately
  3. 3Review the claims — iss, sub, exp, iat, and any custom claims
  4. 4Note: This decodes only — it does not verify the signature

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Frequently Asked Questions

Does this verify the JWT signature?

No. This tool only decodes the header and payload (base64url decoding). It does not verify the signature cryptographically. Use server-side libraries for signature verification.

Is it safe to paste a JWT here?

JWTs contain your identity claims but not your password. However, if your token grants access to sensitive systems, avoid pasting production tokens into any online tool. Use test or expired tokens when possible.

What JWT algorithms are supported for decoding?

All JWT algorithms — HS256, RS256, ES256, etc. — use the same base64url encoding for header and payload, so all can be decoded here.

Is the JWT sent to a server?

No. Decoding runs entirely in your browser using JavaScript.