KrakenD: The Ultra-High performance Open Source API Gateway
KrakenD is a pure API Gateway that interacts with all your different microservices providing clients a single interface. Improves response times, saves bandwidth, delivers a better user experience and saves developers time. Merge many calls into one, transform data, secure the transport, filter fields, shrink responses, throttle connections, establish quota usage limits, decode, enrich and much more.
A single API that exposes many
Reduce the hassle of dealing with every microservice
Move from dealing with every particular microservice to talking to a single backend for frontend that handles the interaction with all your microservices. Configure those services just by editing a simple json file (or using the GUI) and start fetching and sending data to them.
Merge the content of several APIs into single endpoints
KrakenD offers an API that feeds from as many APIs or services you need. Define in every endpoint that you create what is the data you will need and it will be automatically merged for you. You can even control how to merge it. Merge content from public external services and internal microservices. Mix it all!
Get exactly what you want
Expose only the fields you need in your use cases and transform them at will
Put KrakenD in front your services and create endpoints that expose exactly the fields you decide for the different use cases need, using white-listing or black-listing. Remove unwanted or sensitive data, rename fields, encapsulate different API responses into new attributes. Create consistency for the consumer.
No coding. Visual editing of the API
Or edit a JSON file
The use of KrakenD requires no coding because all data transformations, picking, merging, definitions, etc is declared in a single configuration file. All the API gateway behavior can be edited by hand or using the KrakenDesigner, a GUI that allows you visually design your API from scratch or resume an existing one.
The fastest gateway in the market
KrakenD has been built with performance in mind. Expect a massive performance and speed in every running instance. Because KrakenD has been coded in Go and using only the standard lib and no dependencies and with the best architecture practices you'll see a product that can support a huge amount of traffic per box consuming almost no-memory.
Scale out without single points of failure
Stateless. No databases.
Unlike other solutions, KrakenD's stateless design is the only architecture that can provide true linear scalability. KrakenD does not require node coordination or centralization. In a KrakenD cluster, all nodes are autonomous and can keep running even if all other nodes are shut down.
Better user experience
Kill the spinner!
Reduce the time your users are waiting for their mobile devices to load the page. KrakenD removes the mobile devices and web clients the job to open all the connections, merge the data, pick the desired fields and present the information. Let KrakenD do the plumbing and heavy lifting for you, make your clients use the data in its best interest.
Lowest operation cost
Save money in infrastructure and licenses
KrakenD runs in very small machines and needs no database to operate. With an average of 100MB RAM on heavy-traffic machines, KrakenD is low cost, plus all the API Gateway features are open sourced so you don't need to pay for it.
Run it everywhere
On-prem, Hybrid or Cloud native
KrakenD natively runs in any cloud or private datacenter and is designed to run both in orchestration services like Kubernetes, Mesos, Nomad and more through containers and service discovery or directly installed in bare metal, your choice.
With plugins and embedded scripts
You can extend KrakenD functionality and your business logic with Go or Lua scripting. Google CEL (validators), and Martian DSL (for HTTP requests and responses) allow you to do even more operations directly from the configuration file. KrakenD comes with a lot of middlewares, but you can use your own, the ones coded by the community or Enterprise plugins.
Secure the transport
Add all security options at a click
Avoid harmful usage of your backends by rate-limiting the access. Enable OAuth, SSL, certificates, and protect yourself from clickjacking, XSS, MIME-Sniffing, HSTS, HPKP and more. A secure API Gateway out of the box.
OAuth2 and extensions
Connect to your services using OAuth 2.0, the industry-standard protocol for authorization and use URL-safe claims when transferring data, including libraries implementing JWT and the JOSE specs JWS, JWE, JWK, and JWA.
Throttling and usage quotas
KrakenD allows you control the throttling and usage quotas based on the criteria you specify. This limits can be set both for the end users and KrakenD against your infrastructure.
Designed to be able to add a lot more of functionalities, plug-ins and middlewares without modifying its source code (e.g: injecting headers with a DSL language). But if you want to, hey, it's open source!
Efficiently control the number of errors you allow in a time window and respond smartly to problems.
High-load and burst
When settings limits against your backends bursting is controlled to allow certain spikes without affecting the end users.
Service Discovery system based on DNS SRV records. Integrations like Etc available by default.
Unlimited endpoints and backends
KrakenD does not have any limit on the number of parallel queries you can make to different services per call, or number of endpoints you can expose. Limit is your kernel.
All API endpoints, backend definitions and behavior is controlled from a single file. Easily keep track of the changes in your version control system.
URL patterns and variables
Map the request parameters and variables that will pass to your backends just by writing a pattern. Nothing else.
KrakenD load balances efficiently the connections to your backends
Optionally multiply x N a unique request to your backends, take the fastest response and discard the rest to reduce even more the global response time.
Add http cache headers to avoid extra traffic and make clients load faster.
For a single endpoint connect to different sources that use different encoding techniques, either in XML, JSON or RSS and return all you need in JSON
Wrap backend responses in new attributes, rename the fields that are presented to the user, work with objects or collections (arrays)
KrakenD runs natively on Linux, BSD, and Mac OS. A Docker image is offered to extend even more its deployment possibilities.