JWT exp Timestamp Converter

Decode JWT time claims such as exp, iat, and nbf so you can understand when a token was issued and when it expires.

JWT Time Claims

Key / CodeDescription
expExpiration time. The token should not be accepted after this Unix timestamp.
iatIssued at. When the token was created.
nbfNot before. The token should not be accepted before this time.

Example

JWT payload:
{
  "sub": "user_123",
  "exp": 1719830400,
  "iat": 1719826800
}

Read as:
exp and iat are Unix timestamps in seconds, not milliseconds.

Common Mistake

JWT timestamps are normally seconds since Unix epoch. JavaScript Date expects milliseconds, so multiply by 1000 before creating a Date.

Related

JWT Decoder

Inspect token headers and payload claims.

Timestamp Converter

Convert Unix timestamps to local time.

JWT Claims Reference

Learn registered JWT claim names.

Knowledge is power.