Required dependencies

npm install @js-sdsl/ordered-map
npm install @grpc/proto-loader

No native build steps, no pod install, no NDK configuration required. Runs on any Node.js ≥ 12 platform.

Project setup

1. Copy source/ into your project, e.g. at src/grpc-js/.
2. Update tsconfig.json to include the new source tree and enable needed options:

{
  "compilerOptions": {
    "target": "ES2019",
    "module": "commonjs",
    "moduleResolution": "node",
    "esModuleInterop": true,
    "resolveJsonModule": true,
    "strict": true,
    "paths": {
      "@grpc/grpc-js": ["./src/grpc-js/index"]
    }
  },
  "include": ["src"]
}

3. In your application code, import from the local path alias instead of the npm package:

import * as grpc from '@grpc/grpc-js';

4. Optional environment variables:

Public API

Server

class Server {
  constructor(options?: ServerOptions);
  addService(service: ServiceDefinition, implementation: UntypedServiceImplementation): void;
  bindAsync(port: string, creds: ServerCredentials, cb: (err: Error | null, port: number) => void): void;
  start(): void;
  forceShutdown(): void;
  tryShutdown(cb: (err?: Error) => void): void;
}

Use Server to host gRPC services. Call addService with a generated service definition and your handler object, then bindAsync with a ServerCredentials instance, then start().

makeClientConstructor

function makeClientConstructor(
  methods: ServiceDefinition,
  serviceName: string,
  classOptions?: {}
): typeof Client;

Generates a typed client class from a ServiceDefinition (usually produced by @grpc/proto-loader). The returned constructor accepts (address, credentials, options?). Use this when you have a proto-loaded service object but are not using the loadPackageDefinition convenience wrapper.

Metadata

class Metadata {
  constructor(options?: MetadataOptions);
  add(key: string, value: MetadataValue): void;
  set(key: string, value: MetadataValue): void;
  get(key: string): MetadataValue[];
  remove(key: string): void;
  clone(): Metadata;
  merge(other: Metadata): void;
  toJSON(): { [key: string]: MetadataValue[] };
}

Metadata carries gRPC headers for both clients (outgoing call metadata) and servers (initial/trailing metadata). Pass a Metadata instance to any call method or send it from a server handler via call.sendMetadata(meta).

ChannelCredentials

class ChannelCredentials {
  static createInsecure(): ChannelCredentials;
  static createSsl(
    rootCerts?: Buffer | null,
    privateKey?: Buffer | null,
    certChain?: Buffer | null,
    verifyOptions?: VerifyOptions
  ): ChannelCredentials;
}

Required when creating a client channel. Use createInsecure() for local/dev connections; use createSsl() for production with mutual TLS.

StatusBuilder

class StatusBuilder {
  withCode(statusCode: Status): this;
  withDetails(details: string): this;
  withMetadata(metadata: Metadata): this;
  build(): Partial<StatusObject>;
}

Fluent builder for composing StatusObject values in server handlers or test assertions.

Working examples

Scenario - Unary RPC client

A Node.js client calling a remote Greeter.SayHello unary method using a proto-loader-generated definition.

import * as grpc from '@grpc/grpc-js';
import * as protoLoader from '@grpc/proto-loader';
import path from 'path';

const packageDef = protoLoader.loadSync(
  path.join(__dirname, 'protos/helloworld.proto'),
  { keepCase: true, longs: String, enums: String, defaults: true, oneofs: true }
);
const proto = grpc.loadPackageDefinition(packageDef) as any;

const client = new proto.helloworld.Greeter(
  'localhost:50051',
  grpc.ChannelCredentials.createInsecure()
);

const meta = new grpc.Metadata();
meta.add('x-request-id', 'abc-123');

client.sayHello({ name: 'World' }, meta, (err: grpc.ServiceError | null, response: any) => {
  if (err) {
    console.error('RPC error:', err.code, err.message);
    return;
  }
  console.log('Response:', response.message);
});

Scenario - Unary RPC server

Hosting a Greeter service with a simple unary handler.

import * as grpc from '@grpc/grpc-js';
import * as protoLoader from '@grpc/proto-loader';
import path from 'path';

const packageDef = protoLoader.loadSync(
  path.join(__dirname, 'protos/helloworld.proto')
);
const proto = grpc.loadPackageDefinition(packageDef) as any;

function sayHello(
  call: grpc.ServerUnaryCall<{ name: string }, { message: string }>,
  callback: grpc.sendUnaryData<{ message: string }>
) {
  callback(null, { message: `Hello ${call.request.name}` });
}

const server = new grpc.Server();
server.addService(proto.helloworld.Greeter.service, { sayHello });

server.bindAsync(
  '0.0.0.0:50051',
  grpc.ServerCredentials.createInsecure(),
  (err, port) => {
    if (err) throw err;
    console.log(`Listening on ${port}`);
    server.start();
  }
);

Scenario - Mutual TLS client and server

Production setup with TLS certificates on both sides.

import * as grpc from '@grpc/grpc-js';
import * as fs from 'fs';

// Server
const serverCreds = grpc.ServerCredentials.createSsl(
  fs.readFileSync('certs/ca.crt'),
  [{ private_key: fs.readFileSync('certs/server.key'), cert_chain: fs.readFileSync('certs/server.crt') }],
  true // checkClientCertificate
);

const server = new grpc.Server();
// ... addService ...
server.bindAsync('0.0.0.0:50051', serverCreds, (err, port) => {
  if (err) throw err;
  server.start();
});

// Client
const clientCreds = grpc.ChannelCredentials.createSsl(
  fs.readFileSync('certs/ca.crt'),
  fs.readFileSync('certs/client.key'),
  fs.readFileSync('certs/client.crt')
);
// const client = new MyServiceClient('hostname:50051', clientCreds);

Scenario - Attaching call credentials (token-based auth)

import * as grpc from '@grpc/grpc-js';

const callCreds = grpc.CallCredentials.createFromMetadataGenerator(
  (params, callback) => {
    const meta = new grpc.Metadata();
    meta.add('authorization', `Bearer my-token`);
    callback(null, meta);
  }
);

const channelCreds = grpc.ChannelCredentials.createSsl();
const combinedCreds = channelCreds.compose(callCreds);
// const client = new MyServiceClient('api.example.com:443', combinedCreds);

File walkthrough

• index.ts — Aggregates and re-exports the entire public surface of the library.
• server.ts — Core Server class: HTTP/2 binding, service registry, graceful shutdown.
• client.ts — Client base class with call dispatch, options, and interceptor support.
• make-client.ts — Factory utilities that turn a ServiceDefinition into a Client subclass.
• channel.ts — Channel interface and ChannelImplementation: connection lifecycle and state.
• internal-channel.ts — Internal channel plumbing used by Client and load balancers.
• call-credentials.ts — CallCredentials factory (metadata generators, OAuth2, composition).
• channel-credentials.ts — ChannelCredentials for insecure and TLS channel security.
• metadata.ts — Metadata container for gRPC headers; handles binary (-bin) keys automatically.
• server-call.ts — Typed server-side call objects and handler type aliases.
• server-credentials.ts — ServerCredentials for insecure and TLS listener security.
• server-interceptors.ts — Server interceptor interfaces and listener chain types.
• call.ts — Client-side stream types returned by stub methods.
• call-interface.ts — Shared interfaces: StatusObject, WriteObject, InterceptingListener.
• resolver.ts — Resolver plugin registration API and ResolverListener.
• resolver-dns.ts — DNS SRV/A/AAAA resolver implementation.
• resolver-ip.ts — Literal IP address resolver.
• resolver-uds.ts — Unix domain socket resolver.
• load-balancer.ts — Load-balancer plugin registration and LoadBalancer interface.
• load-balancer-round-robin.ts — Round-robin policy implementation.
• load-balancer-pick-first.ts — Pick-first policy implementation.
• load-balancer-weighted-round-robin.ts — Weight-aware round-robin policy.
• load-balancer-outlier-detection.ts — Outlier detection wrapping policy.
• load-balancer-child-handler.ts — Utility for LB policies that wrap another policy.
• retrying-call.ts — Hedging and retry call wrapper with RetryThrottler.
• resolving-call.ts — Call layer that waits for name resolution before proceeding.
• resolving-load-balancer.ts — Combines resolver and LB into a single entity.
• load-balancing-call.ts — Call layer sitting between retries and the subchannel picker.
• service-config.ts — Parses and validates gRPC service config (retry, LB, method config).
• channelz.ts — Full channelz gRPC service implementation for runtime introspection.
• admin.ts — registerAdminService to add channelz/CSDS to an existing server.
• subchannel.ts — Subchannel lifecycle: connect, disconnect, HTTP/2 session.
• subchannel-pool.ts — Shared pool that de-duplicates subchannels by address.
• subchannel-address.ts — SubchannelAddress type plus TCP/UDS helpers.
• subchannel-call.ts — Single HTTP/2 stream call executing on a subchannel.
• subchannel-interface.ts — SubchannelInterface type used across LB layers.
• transport.ts — HTTP/2 transport abstraction, CallEventTracker.
• tls-helpers.ts — Reads default root CA certs, builds SecureContext.
• uri-parser.ts — Parses gRPC target strings into GrpcUri.
• status-builder.ts — Fluent StatusBuilder for constructing status objects.
• stream-decoder.ts — Decodes gRPC length-prefixed message frames.
• filter.ts / filter-stack.ts — Composable client-side interceptor filter chain.
• client-interceptors.ts — Client interceptor call wrapper and types.
• logging.ts — trace() and log() with verbosity gating.
• constants.ts — Status (gRPC status codes), LogVerbosity, Propagate enums.
• connectivity-state.ts — ConnectivityState enum (IDLE, CONNECTING, READY, …).
• compression-filter.ts / compression-algorithms.ts — gzip/deflate/identity compression.
• deadline.ts — Deadline type (Date | number) and formatDateDifference.
• backoff-timeout.ts — Exponential-backoff timer with jitter.
• http_proxy.ts — Detects and tunnels through HTTP CONNECT proxies.
• environment.ts — Reads GRPC_* environment variables.
• error.ts — getErrorMessage safe extraction from unknown errors.
• call-number.ts — Monotonically increasing call ID generator.
• object-stream.ts — Typed duplex/readable/writable stream helpers.
• events.ts — Internal event name constants.
• orca.ts — ORCA per-request load reporting via PerRequestMetricRecorder.
• auth-context.ts — AuthContext exposing per-connection TLS metadata.
• certificate-provider.ts — Plugin interface for dynamic certificate rotation.
• channel-options.ts — ChannelOptions keys and types (keepalive, max message sizes, etc.).
• duration.ts — Protobuf Duration conversions.
• control-plane-status.ts — xDS control plane NACK status helpers.
• priority-queue.ts — Min-heap priority queue used by LB subsystem.
• single-subchannel-channel.ts — A channel that always uses one specific subchannel.
• experimental.ts — Unstable APIs gated behind an explicit import.
• generated/ — Auto-generated TypeScript protobuf types for channelz, ORCA, and xDS protos.

Common pitfalls and fixes

• GRPC_VERBOSITY not set in production — the library defaults to no output; set GRPC_VERBOSITY=ERROR to surface real errors without trace noise.
• @js-sdsl/ordered-map missing — channelz.ts imports it directly; if your bundler tree-shakes it out, add it as an explicit dependency and verify it appears in node_modules.
• Proto-loader version mismatch — loadPackageDefinition expects objects produced by @grpc/proto-loader ≥ 0.6; older versions produce incompatible shapes.
• bindAsync called but start() forgotten — bindAsync only registers the port; the server does not accept connections until start() is explicitly called afterward.
• Binary metadata keys — keys ending in -bin must have Buffer values, not strings; passing a string throws at runtime inside Metadata.add.
• ESM projects — this source is CommonJS (module: commonjs); in an ESM project, use "type": "commonjs" in the source subtree's package.json or configure ts-node with esm: false.

Vibe-coding prompt template

I have the source of @grpc/grpc-js at src/grpc-js/ (entry point: src/grpc-js/index.ts)
and a USAGE.md file describing the full API.

Please integrate gRPC into my existing Node.js/TypeScript project by:
1. Reading USAGE.md and src/grpc-js/index.ts to understand the real exports.
2. Installing the required peer dependencies listed in USAGE.md § "Required dependencies".
3. Adding a path alias in tsconfig.json: "@grpc/grpc-js" -> ["./src/grpc-js/index"].
4. Creating src/grpc/server.ts that instantiates grpc.Server, registers my
   [SERVICE_NAME] service, binds on port [PORT] with insecure credentials, and starts.
5. Creating src/grpc/client.ts that builds a client stub for [SERVICE_NAME] using
   makeClientConstructor or loadPackageDefinition and ChannelCredentials.createInsecure().
6. Adding Metadata headers [HEADERS] to every outgoing call via CallCredentials.createFromMetadataGenerator.
7. Wiring the server into my existing Express app startup (src/app.ts) so both
   HTTP and gRPC start together.
Only use symbols present in src/grpc-js/index.ts or explicitly documented in USAGE.md.
Do not invent API surface. Show each file in full.

License and credit

Licensed under the Apache License 2.0 (see source/LICENSE if present, or the license header at the top of each source file). Upstream package: @grpc/grpc-js, part of the grpc-node monorepo maintained by the gRPC authors.

This product’s unique contribution is clean room implementation of valuable code block into AVCP compatible standard.

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