dvcrn JWT Decode
Decode JWTs from the terminal. See what's inside, check if expired.
Installation
npm install -g @lxgicstudios/jwt-decode
Commands
Decode Token
npx @lxgicstudios/jwt-decode eyJhbGciOiJIUzI1NiIs...
# Works with Bearer prefix
npx @lxgicstudios/jwt-decode "Bearer eyJhbGci..."
From Environment Variable
echo $AUTH_TOKEN | npx @lxgicstudios/jwt-decode
From File
npx @lxgicstudios/jwt-decode -f token.txt
Check if Expired
npx @lxgicstudios/jwt-decode --check $TOKEN && echo "Valid" || echo "Expired"
Extract Specific Claim
npx @lxgicstudios/jwt-decode -c sub $TOKEN
npx @lxgicstudios/jwt-decode -c email $TOKEN
Example Output
Header
──────
alg: "HS256"
typ: "JWT"
Payload
───────
sub: "1234567890"
name: "John Doe"
email: "john@example.com"
iat: 1706547200 (2024-01-29T16:00:00.000Z)
exp: 1706633600 (2024-01-30T16:00:00.000Z)
Status
──────
Valid - expires in 23 hours
Options
| Option | Description |
|---|---|
-f, --file |
Read from file |
-c, --claim |
Extract specific claim |
--header |
Show only header |
--payload |
Show only payload |
--json |
JSON output |
--check |
Exit 1 if expired |
Common Use Cases
Debug auth token:
npx @lxgicstudios/jwt-decode $AUTH_TOKEN
Get user ID from token:
npx @lxgicstudios/jwt-decode -c sub $TOKEN
Use in scripts:
if npx @lxgicstudios/jwt-decode --check $TOKEN 2>/dev/null; then
echo "Token valid"
else
echo "Token expired, refreshing..."
fi
Features
- Colored, readable output
- Automatic Bearer prefix handling
- Human-readable expiration times
- Timestamp conversion
- Script-friendly exit codes
- JSON output mode
Built by LXGIC Studios