Decode a JWT and read its claims.

Paste a JWT to see its header and payload as formatted JSON. This tool reads claims — it does not check the signature.

JWT input

JWT

Result

Decoded claims

text
{
  "header": {
    "alg": "HS256",
    "typ": "JWT"
  },
  "payload": {
    "sub": "1234567890",
    "name": "John Doe",
    "iat": 1516239022
  }
}

Processed locally — inputs and results stay in this browser tab. Copy and download actions run only when you choose them.

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Decoding is not verification

Base64URL-decoding the header and payload proves nothing about who issued the token or whether it was altered afterward. Checking the signature, issuer, audience, and expiry against a trusted policy is a separate step this tool does not perform.

Never paste a live production token into a shared result.
A decoded expiry claim still needs to be checked against the current time.
Signature verification needs the correct key and algorithm, not just the token.

Signalbench

Inspect, transform, and debug data without sending it away.

Tools

Home Format and validate JSON without leaving your browser.Decode a JWT and read its claims.Understand any cron expression at a glance.Compare two texts line by line.Encode and decode Base64 without breaking Unicode.Encode URL components without confusing + and %20.

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