root@generate-random:~/jwt-tokens/cpp$ _

Generate JWT Tokens in C++

Complete code tutorial with examples and best practices

C++

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[ Code Example - Quick Summary ]

Language: C++

What: Generate secure JWT tokens in C++ using the jwt-cpp library. Suitable for game servers, native desktop applications, and high-performance authentication systems.

Try it: Use our interactive Jwt-tokens generator or integrate this code into your C++ application.

Generate secure JWT tokens in C++ using the jwt-cpp library. Suitable for game servers, native desktop applications, and high-performance authentication systems. Looking for other languages? Check our code examples in PHP , JavaScript , Python , Java , C# , Ruby and Go or use our interactive web generator.

C++ Code Example

#include <jwt-cpp/jwt.h>
#include <iostream>
#include <chrono>

std::string generateJWT(const std::string& userId,
                        const std::string& username,
                        const std::string& role) {
    auto now = std::chrono::system_clock::now();
    auto exp = now + std::chrono::hours(1);

    std::string secret = "your-256-bit-secret-key";

    auto token = jwt::create()
        .set_issuer("https://yourdomain.com")
        .set_audience("https://yourdomain.com")
        .set_issued_at(now)
        .set_expires_at(exp)
        .set_payload_claim("user_id", jwt::claim(userId))
        .set_payload_claim("username", jwt::claim(username))
        .set_payload_claim("role", jwt::claim(role))
        .sign(jwt::algorithm::hs256{secret});

    return token;
}

bool validateJWT(const std::string& token, const std::string& secret) {
    try {
        auto verifier = jwt::verify()
            .allow_algorithm(jwt::algorithm::hs256{secret})
            .with_issuer("https://yourdomain.com")
            .with_audience("https://yourdomain.com");

        auto decoded = jwt::decode(token);
        verifier.verify(decoded);

        // Access claims
        std::cout << "User ID: "
                  << decoded.get_payload_claim("user_id").as_string()
                  << std::endl;
        return true;
    } catch (const std::exception& e) {
        std::cerr << "Validation failed: " << e.what() << std::endl;
        return false;
    }
}

int main() {
    std::string jwt = generateJWT("123", "john_doe", "admin");
    std::cout << "JWT: " << jwt << std::endl;

    validateJWT(jwt, "your-256-bit-secret-key");

    return 0;
}

[EXPLANATION]

The jwt-cpp library provides a modern C++ interface for JWT operations. It uses a fluent API for token creation and a verifier pattern for validation. The library supports HS256, RS256, and ES256 algorithms. Use std::chrono for time handling and proper exception handling for validation errors.

Expected Output

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyX2lkIjoiMTIzIiwidXNlcm5hbWUiOiJqb2huX2RvZSIsInJvbGUiOiJhZG1pbiIsImlzcyI6Imh0dHBzOi8veW91cmRvbWFpbi5jb20iLCJhdWQiOiJodHRwczovL3lvdXJkb21haW4uY29tIiwiaWF0IjoxNjgwMDAwMDAwLCJleHAiOjE2ODAwMDM2MDB9.signature