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tessl/npm-apollo--server

Core engine for Apollo GraphQL server providing a spec-compliant GraphQL runtime compatible with any GraphQL client

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tessl
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Public
Created
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Describes
npmpkg:npm/@apollo/server@5.0.x

To install, run

npx @tessl/cli install tessl/npm-apollo--server@5.0.0

index.mddocs/

Apollo Server

Apollo Server is a comprehensive, production-ready GraphQL server implementation for TypeScript and JavaScript that provides a spec-compliant GraphQL runtime compatible with any GraphQL client. It serves as the core engine for building scalable GraphQL APIs with multiple deployment options, extensive plugin system, and comprehensive tooling for GraphQL federation scenarios.

Package Information

  • Package Name: @apollo/server
  • Package Type: npm
  • Language: TypeScript
  • Installation: npm install @apollo/server graphql

Core Imports

import { ApolloServer } from "@apollo/server";
import { startStandaloneServer } from "@apollo/server/standalone";

For CommonJS:

const { ApolloServer } = require("@apollo/server");
const { startStandaloneServer } = require("@apollo/server/standalone");

Basic Usage

import { ApolloServer } from "@apollo/server";
import { startStandaloneServer } from "@apollo/server/standalone";

// Define your GraphQL schema
const typeDefs = `
  type Query {
    hello: String
  }
`;

const resolvers = {
  Query: {
    hello: () => "Hello world!",
  },
};

// Create Apollo Server instance
const server = new ApolloServer({
  typeDefs,
  resolvers,
});

// Start standalone server
const { url } = await startStandaloneServer(server, {
  listen: { port: 4000 },
});

console.log(`🚀 Server ready at: ${url}`);

Architecture

Apollo Server is built around several key components:

  • ApolloServer Class: Core server instance managing schema, plugins, and request lifecycle
  • Plugin System: Extensible architecture with built-in plugins for caching, tracing, reporting, and more
  • HTTP Integration: Framework-agnostic HTTP handling with built-in standalone server option
  • Type Safety: Full TypeScript integration with comprehensive type definitions
  • Federation Support: Built-in support for Apollo Federation with subgraph capabilities
  • Request Pipeline: Sophisticated request processing with parsing, validation, execution, and response formatting

Capabilities

Server Lifecycle Management

Core ApolloServer class providing initialization, startup, request execution, and shutdown functionality. Essential for all GraphQL server deployments.

class ApolloServer<TContext extends BaseContext = BaseContext> {
  constructor(config: ApolloServerOptions<TContext>);
  start(): Promise<void>;
  stop(): Promise<void>;
  executeOperation<TData, TVariables>(
    request: GraphQLRequest<TVariables>,
    options?: ExecuteOperationOptions<TContext>
  ): Promise<GraphQLResponse<TData>>;
}

Server Lifecycle

Plugin System

Comprehensive plugin architecture for extending Apollo Server functionality including caching, tracing, analytics, federation, and custom integrations.

interface ApolloServerPlugin<TContext extends BaseContext> {
  serverWillStart?(service: GraphQLServerContext): Promise<GraphQLServerListener | void>;
  requestDidStart?(requestContext: GraphQLRequestContext<TContext>): Promise<GraphQLRequestListener<TContext> | void>;
}

// Built-in plugins
function ApolloServerPluginCacheControl(options?: ApolloServerPluginCacheControlOptions): ApolloServerPlugin;
function ApolloServerPluginUsageReporting<TContext>(options?: ApolloServerPluginUsageReportingOptions<TContext>): ApolloServerPlugin<TContext>;

Plugin System

HTTP Integration

HTTP request handling, standalone server creation, and framework integration capabilities. Supports both standalone deployment and integration with existing web frameworks.

function startStandaloneServer<TContext extends BaseContext>(
  server: ApolloServer<TContext>,
  options?: StartStandaloneServerOptions<TContext> & { listen?: ListenOptions }
): Promise<{ url: string }>;

class HeaderMap extends Map<string, string> {
  set(key: string, value: string): this;
  get(key: string): string | undefined;
}

HTTP Integration

Error Handling

Comprehensive error management with standard error codes, custom error formatting, and error reporting utilities.

enum ApolloServerErrorCode {
  INTERNAL_SERVER_ERROR = 'INTERNAL_SERVER_ERROR';
  GRAPHQL_PARSE_FAILED = 'GRAPHQL_PARSE_FAILED';
  GRAPHQL_VALIDATION_FAILED = 'GRAPHQL_VALIDATION_FAILED';
  BAD_USER_INPUT = 'BAD_USER_INPUT';
}

function unwrapResolverError(error: unknown): unknown;

Error Handling

Core Types

Essential type definitions for server configuration, request/response handling, context management, and plugin development.

interface ApolloServerOptions<TContext extends BaseContext> {
  typeDefs?: TypeSource;
  resolvers?: IResolvers;
  schema?: GraphQLSchema;
  plugins?: ApolloServerPlugin<TContext>[];
  formatError?: (formattedError: GraphQLFormattedError, error: unknown) => GraphQLFormattedError;
}

interface GraphQLRequest<TVariables = VariableValues> {
  query?: string | DocumentNode;
  operationName?: string;
  variables?: TVariables;
  extensions?: Record<string, any>;
}

Core Types