7 min read
2026-03-04
JWT (JSON Web Token) is an open standard (RFC 7519) for securely transferring information between parties in the form of a JSON object.
JWT consists of three parts, separated by dots:
**Header** - algorithm and token type
**Payload** - payload (claims)
**Signature** - signature for verification
| Claim | Description |
|---|---|
| iss | Token Publisher |
| sub | Subject (user) |
| aud | Audience |
| exp | Expiration time |
| iat | Time of creation |
| jti | Unique identifier |
HS256 — HMAC with SHA-256 (symmetric key)
RS256 — RSA with SHA-256 (asymmetric key)
ES256 — ECDSA with SHA-256 (elliptic curves)
Paste the JWT token into the input field
Instantly see the decoded Header and Payload
Check the token expiration date
Verify the signature (if you have a key)
See also: HTTP status codes, JSON Formatter, MIME Types