(Node.js) Create JWT using a Certificate's Private Key

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using a certificate's private key.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOS

var os = require('os');
if (os.platform() == 'win32') {  
  var chilkat = require('@chilkat/ck-node23-win64'); 
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node23-linux-arm');
    } else if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node23-linux-arm64');
    } else {
        var chilkat = require('@chilkat/ck-node23-linux-x64');
    }
} else if (os.platform() == 'darwin') {
  var chilkat = require('@chilkat/ck-node23-mac-universal');
}

function chilkatExample() {

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Demonstrates how to create a JWT using an certificate's private key.

    var cert = new chilkat.Cert();

    // Load an ECC private key from a PEM file.
    var success = cert.LoadPfxFile("c:/temp/myPfx.pfx","pfxPassword");
    if (success !== true) {
        console.log(cert.LastErrorText);
        return;
    }

    var jwt = new chilkat.Jwt();

    // Build the JOSE header
    var jose = new chilkat.JsonObject();
    // Note: The IsEcdsa function was added in Chilkat v10.1.0
    if (cert.IsEcdsa() == true) {
        // Use ES256.  Pass the string "ES384" or "ES512" to use ECC with SHA-384 or SHA-512.
        jose.AppendString("alg","ES256");
    }
    else {
        // Probably RSA...
        // Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
        jose.AppendString("alg","RS256");
    }

    jose.AppendString("typ","JWT");

    // Now build the JWT claims (also known as the payload)
    var claims = new chilkat.JsonObject();
    claims.AppendString("iss","http://example.org");
    claims.AppendString("sub","John");
    claims.AppendString("aud","http://example.com");

    // Set the timestamp of when the JWT was created to now.
    var curDateTime = jwt.GenNumericDate(0);
    claims.AddIntAt(-1,"iat",curDateTime);

    // Set the "not process before" timestamp to now.
    claims.AddIntAt(-1,"nbf",curDateTime);

    // Set the timestamp defining an expiration time (end time) for the token
    // to be now + 1 hour (3600 seconds)
    claims.AddIntAt(-1,"exp",curDateTime+3600);

    // Produce the smallest possible JWT:
    jwt.AutoCompact = true;

    // Create the JWT token.
    var token = jwt.CreateJwtCert(jose.Emit(),claims.Emit(),cert);

    console.log(token);

    // Example output:
    // eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDg1NzA4NzkyLCJuYmYiOjE0ODU3MDg3OTIsImV4cCI6MTQ4NTcxMjM5Mn0.wqsuyJpxJ073ox-lOiLFqG1lQocXe4hGf2XGZJRrO3qn0UusxI_bu3Gzky8gBsH4sA4u9TWZn5M-1wYMMIJk6Q

}

chilkatExample();