API Key Authentication

Secure Your API with API Keys

The Zuplo API Gateway protects your backend API from unauthorized access, abuse, and overload. Add API key authentication to your API in minutes.

Secure Access

Authenticate every request before it reaches your backend.

Control Costs

Set rate limits and quotas to prevent runaway usage.

Ensure Reliability

Shield your backend from overload with traffic management.

How it works

The Zuplo API Gateway sits between your clients and your backend, providing a secure layer of protection and control.

Client

Zuplo API Gateway

Customer VPC

Backend

Step-by-step tutorial

It takes only a few minutes to put Zuplo in front of your backend, adding API key authentication, and configuring your origin to trust requests from Zuplo using JWT verification.

Create a Route in Zuplo

First, create a new route in your Zuplo project that will proxy requests to your backend. This route will be the entry point for your API consumers.

Learn how to create routes

📄 OpenAPI native. Import your existing OpenAPI spec to instantly create routes and power your API documentation .

Add API Key Authentication Policy

Add the API Key Authentication policy to your route. This policy validates incoming API keys and ensures only authorized consumers can access your API.

Adding API Key Authentication policy in Zuplo

API Key Authentication docs

🔐 Leaked key? No problem. As a GitHub Secret Scanning partner, Zuplo can automatically revoke exposed keys before they can be exploited.

Enable the JWT Service Plugin

Enable the JWT Service Plugin in your Zuplo project. This plugin generates JWTs that your origin API can validate, creating a secure trust relationship between Zuplo and your backend.

modules/zuplo.runtime.ts

 export function runtimeInit(runtime: RuntimeExtensions) {
  // Register the JWT Service Plugin
  runtime.addPlugin(new JwtServicePlugin());
} 

JWT Service Plugin docs

Secure Your API with JWT Authentication

Configure your backend to validate the JWTs issued by Zuplo. This ensures that only requests coming through your Zuplo gateway are accepted.

ruby

 require 'hanami/api'
require 'jwt'
require 'net/http'
require 'uri'
require 'json'

class JWKS
  ISSUER = "https://my-api-a32f34.zuplo.api/__zuplo/issuer"
  JWKS_URI = "#{ISSUER}/.well-known/jwks.json"

  def initialize
    @keys = fetch_keys
  end

  def fetch_keys
    uri = URI(JWKS_URI)
    response = Net::HTTP.get(uri)
    JSON.parse(response)['keys']
  end

  def find_key(kid)
    @keys.find { |key| key['kid'] == kid }
  end

  def get_public_key(kid)
    key_data = find_key(kid)
    return unless key_data

    OpenSSL::X509::Certificate.new(Base64.decode64(key_data['x5c'].first)).public_key
  rescue OpenSSL::OpenSSLError => e
    nil
  end
end

class JWTGuard
  def initialize(app)
    @app = app
    @jwks = JWKS.new
  end

  def call(env)
    token = extract_token(env)

    if token.nil?
      return [401, {'Content-Type' => 'application/json'}, [{ error: 'No token provided' }.to_json]]
    end

    begin
      decoded_token = decode_jwt(token)
      env['user'] = decoded_token
      @app.call(env)
    rescue JWT::DecodeError => e
      [401, {'Content-Type' => 'application/json'}, [{ error: 'Invalid token', details: e.message }.to_json]]
    end
  end

  private

  def extract_token(env)
    auth_header = env['HTTP_AUTHORIZATION']
    auth_header&.gsub(/^Bearer /, '')
  end

  def decode_jwt(token)
    header = JWT.decode(token, nil, false).first
    kid = header['kid']

    public_key = @jwks.get_public_key(kid)
    raise JWT::DecodeError, 'No signing key found' unless public_key

    JWT.decode(token, public_key, true, { iss: JWKS::ISSUER, verify_iss: true, algorithm: 'RS256' }).first
  end
end

class App < Hanami::API
  use JWTGuard

  get '/protected' do
    user = env['user']
    json message: "Access granted", user: user
  end
end 

Call Your API Through Zuplo

Now you can call your API through Zuplo using an API key. The request will be authenticated at the gateway, and a JWT will be forwarded to your backend.

bash

 curl -X GET \
  'https://your-api.zuplo.dev/your-route' \
  -H 'Authorization: Bearer YOUR_API_KEY' 

Ready to secure your API?

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