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# Create JWT header and payload!/bin/bash

header='{"alg": "HS256", "typ": "JWT"}'
payload='{"iss": "example_issuer", "sub": "1234567890", "aud": "myclient", "exp": 3000000000, "client_id": "myclient", "role": "user"}'

# Base64 encode the header and payload without padding
header_base64=$(echo -n "$header" | openssl base64 -e | tr -d '=' | tr '/+' '_-' )
payload_base64=$(echo -n "$payload" | openssl base64 -e -A | tr -d '=' | tr '/+' '_-')

# Create a signature
secret="your-256-bit-secretmysecret"
signature_base64=$(echo -n "${header_base64}.${payload_base64}" | openssl dgst -sha256 -hmac $secret"${secret}" -binary | openssl base64 -e | tr -d '=' | tr '/+' '_-')

# Combine to form the JWT
jwt="${header_base64}.${payload_base64}.${signature_base64}"
echo "JWT: $jwt"