Free Developer Tool — 100% Client-Side

JWT Expiration Checker

Check when a JWT token expires. Decode JWT headers and payloads, inspect exp, iat, and other claims in real-time.

JWT Token

What Is a JWT Expiration Checker?

A JWT expiration checker decodes JSON Web Tokens and inspects their time-based claims — specifically exp (expiration) and iat (issued at). JWTs are commonly used for authentication and authorization, and tokens include an expiration time to limit their validity period. Our JWT token expiry checker shows you exactly when a token expires, how much time remains, and whether the token is still valid.

Why Token Expiration Matters

Security

Expired tokens cannot be reused, limiting the damage if a token is leaked. Short expiration times (15–60 minutes) are standard practice.

Refresh Tokens

Access tokens expire quickly; refresh tokens have longer lifespans. The exp claim controls when re-authentication is required.

How to Use This JWT Expiration Checker

Paste your JWT token into the input field and click Check Expiration. The tool decodes the header and payload, displays the expiration and issued-at timestamps as human-readable dates, and shows a color-coded status badge — green for valid tokens with time remaining, red for expired tokens. Use Load Example to see a sample token with an active expiration. All processing is client-side; your tokens are never transmitted.

Understanding JWT Time Claims

exp (Expiration) — Unix timestamp (seconds since epoch) when the token expires. The token is invalid after this time.
iat (Issued At) — Unix timestamp when the token was created. Used to calculate token age.
nbf (Not Before) — Unix timestamp before which the token is not yet valid.
auth_time — Unix timestamp of when the user authenticated (commonly used in OpenID Connect).

Is Checking JWT Expiration Locally Safe?

Yes. This JWT expiry checker runs entirely in your browser. JWT tokens are Base64Url-encoded, not encrypted — anyone with the token can decode and read the header and payload. However, the signature cannot be verified without the secret key. Never share your secret key or put sensitive data in a JWT payload. Use this tool to inspect and debug your tokens safely.

How to Do This in Code

function decodeJWT(token) {
  const parts = token.split('.');
  const payload = JSON.parse(atob(parts[1]));
  const expDate = new Date(payload.exp * 1000);
  const now = new Date();
  return { expired: expDate < now, expiresAt: expDate };
}

import jwt, time
token = "your.jwt.token"
decoded = jwt.decode(token, options={"verify_signature": False})
expired = decoded['exp'] < time.time()
print(f"Expired: {expired}")

import ("time"; "github.com/golang-jwt/jwt/v5")

token, _, _ := jwt.NewParser().ParseUnverified(jwtStr, jwt.MapClaims{})
claims := token.Claims.(jwt.MapClaims)
exp, _ := claims.GetExpirationTime()
fmt.Println("Expired:", exp.Time.Before(time.Now()))

echo "token" | cut -d. -f2 | base64 -d 2>/dev/null | jq -r '.exp, .iat'
# Or use jwt-cli:
jwt decode "token"

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