English
Developer Tools

JWT Decoder

Paste a JWT to read its decoded header and payload, with issued-at and expiry times.

Header
{
  "alg": "HS256",
  "typ": "JWT"
}
Payload
{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022
}
  • Issued at1/18/2018, 1:30:22 AM

Decoding does not verify the signature. Never trust a token without verifying it on your server.

How to use it

  1. Paste your token A full JWT with header and payload.
  2. Read the sections Header and payload are shown as JSON.
  3. Check the dates Issued-at and expiry are converted to readable times.

Examples

header alg, typ
payload sub, name, iat

About this tool

JSON Web Tokens encode their header and payload as base64url, which is compact but unreadable at a glance. This decoder splits the token and shows the header and payload as formatted JSON, so you can quickly check the claims inside.

It also converts the standard issued-at and expiry timestamps into readable dates and flags expired tokens. Decoding never verifies the signature — that must happen on your server with the signing key — and nothing you paste leaves your browser.

Frequently asked questions

Does this verify the token?

No. It only decodes the header and payload so you can inspect them. Verifying the signature requires the secret or key and should be done server-side.

Is my token sent anywhere?

No. Decoding happens entirely in your browser, so the token never leaves your device.

Related tools

Base64 Encode & Decode Convert text to and from Base64. Handles Unicode correctly and never sends your data anywhere. JSON Formatter & Validator Paste JSON to pretty-print it with indentation, minify it to one line, or check that it's valid. Number Base Converter Enter a value and its base to see it in binary, octal, decimal and hexadecimal at once. Color Converter Enter a colour as HEX, RGB or HSL and see the other formats update instantly, with a live swatch. Hash Generator Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of any text, computed locally in your browser. Unix Timestamp Converter Convert between Unix epoch seconds and readable dates, in both directions, with UTC and ISO output.

Updated June 13, 2026