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JWT Inspector

Everything the JWT Decoder shows, plus token length, per-segment byte sizes, and a clear expiration-status readout. Like the decoder, this is inspection only — it never verifies a signature.

Decoding a JWT does not verify its signature. Anyone can read or edit the header and payload of a JWT without knowing its secret — only verification against the original signing key confirms a token is authentic. Nothing shown below should be treated as proof the token is valid.
Paste a token to decode it — nothing leaves your browser

ReadySecurity & Cryptography ToolsFree · No account required

Related tools

JWT DecoderDecode a JWT's header and payload — without verifying its signature.JWT GeneratorEncode and HMAC-sign a JWT for testing, entirely in your browser.

Features

  • Everything the JWT Decoder shows, plus token length and per-segment byte sizes
  • A dedicated expiration-status readout (expired / active / no exp claim)
  • Algorithm and full claim breakdown at a glance

How to use

  1. Paste a JWT into the input.
  2. Review the structure panel for size and length details.
  3. Check the expiration banner and claims list.

Example

Inspection is not cryptographic verification: this tool can tell you a token has expired or that its payload contains a given claim, but it cannot confirm the token was actually issued by whoever it claims to be from.