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GraphQL platform engineered for scale

Tailcall is a high-performance, open-source API orchestrator that enables organizations to construct unified data access layers on top of existing APIs.

Get Started

Setup Tailcall via npm to build a high-performance GraphQL API on top of existing REST endpoints. Checkout our docs for detailed tutorials and guides.

npm i -g @tailcallhq/tailcall
@server(port: 8000)
@upstream(baseURL: "") {
query: Query

type Query {
users: [User] @http(path: "/users")
posts: [Post] @http(path: "/posts")

type User {
id: Int!
name: String!
username: String!
email: String!

type Post {
id: Int!
title: String!
body: String!
userId: Int!

# Expand a post with user information
user: User @http(path: "/users/{{.value.userId}}")
tailcall start ./app.graphql
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The Problem

Where traditional
gateways fail?

A traditional API Gateway restricts operations to an API's route, method, or headers, and doesn't allow modifications to the request and response bodies. This limitation constrains the operations that can be performed on an API, ultimately compelling engineering teams to either intertwine orchestration logic with business logic or to develop and maintain a separate layer of abstraction such as BFF (backend for frontend).


Tailcall provides first-class primitives to perform API Orchestration across protocols such as gRPC, REST, GraphQL,. This allow developers to enrich existing APIs with more data, perform transformations or build a completely new set of aggregation APIs.


With Tailcall, your focus shifts to the 'what'—such as entities, their relationships, access control, security, authentication, caching, and more—rather than the 'how'. This shift is enabled by the Tailcall DSL, embodying a true declarative approach to managing APIs. Unlike traditional API gateways that apply these properties directly to APIs, Tailcall's DSL simplifies governance and clarifies semantics, providing a more intuitive framework for API management.


Tailcall can introspect all orchestration requirements ahead of time and automatically generate a highly efficient data access layer. This results in achieving much lower resource utilization and opens up opportunities to use in ultra-low latency workloads.


At times, the built-in primitives may not fully satisfy specific orchestration needs. In such instances, Tailcall offers a lightweight embedded JavaScript runtime. This feature enables you to attach custom hooks for monitoring events within Tailcall, allowing you to directly issue commands for the subsequent actions Tailcall should execute.

There’s so much more.
Ahead of Time Optimizations
Composable Orchestration Primitives
Macro Resiliency Capabilities
Protocol agnostic
High Performance
Edge Compatible
Compile time Checks
Adaptive performance improvements
Global rate limiting
Scripting Flexibility
Platform made for performance.
(Higher is better)
Latency (ms)
(Lower is better)

More reasons to choose tailcall.

Top developer experience

Design your APIs, with syntax highlighting and lint checks within your favourite IDE.


Get performance that’s higher than your hand optimized implementation

Scale Fearlessly

Leverage built-in best practices that guarantee robustness at any scale.

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