### Start the Server

Source: https://github.com/grpc/grpc-node/blob/master/examples/cancellation/README.md

Run the server script to start the gRPC server.

```bash
node server.js
```

--------------------------------

### Install @grpc/proto-loader

Source: https://github.com/grpc/grpc-node/blob/master/packages/proto-loader/README.md

Install the package using npm.

```sh
npm install @grpc/proto-loader
```

--------------------------------

### Install gRPC Node.js Dependencies

Source: https://github.com/grpc/grpc-node/blob/master/examples/README.md

Clone the gRPC repository and install necessary npm packages for the examples. Ensure Node.js version 8.13.0 or greater is installed.

```sh
$ # Get the gRPC repository
$ export REPO_ROOT=grpc-node # REPO root can be any directory of your choice
$ git clone -b RELEASE_TAG_HERE https://github.com/grpc/grpc-node $REPO_ROOT
$ cd $REPO_ROOT

$ cd examples
$ npm install
```

--------------------------------

### Install grpc-health-check

Source: https://github.com/grpc/grpc-node/blob/master/packages/grpc-health-check/README.md

Install the package using npm.

```bash
npm install grpc-health-check
```

--------------------------------

### Install @grpc/reflection

Source: https://github.com/grpc/grpc-node/blob/master/packages/grpc-reflection/README.md

Install the gRPC reflection package using npm.

```bash
npm install @grpc/reflection
```

--------------------------------

### Pick First Load Balancing Example Output

Source: https://github.com/grpc/grpc-node/blob/master/examples/load_balancing/README.md

Output demonstrating the `pick_first` load balancing policy, where all RPCs are directed to a single backend server.

```text
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50051)
```

--------------------------------

### Install @grpc/grpc-js

Source: https://github.com/grpc/grpc-node/blob/master/packages/grpc-js/README.md

Install the @grpc/grpc-js package using npm. Node 12 or higher is recommended.

```sh
npm install @grpc/grpc-js
```

--------------------------------

### Configure Protobuf Loading Options

Source: https://github.com/grpc/grpc-node/blob/master/packages/proto-loader/README.md

Example of an options object to customize protobuf loading behavior, closely approximating the behavior of `grpc.load`.

```js
const options = {
  keepCase: true,
  longs: String,
  enums: String,
  defaults: true,
  oneofs: true
}
```

--------------------------------

### Generate Route Guide gRPC Code

Source: https://github.com/grpc/grpc-node/blob/master/examples/routeguide/static_codegen/README.md

Use this command to generate the static gRPC code for the Route Guide service. Ensure you are in the correct directory and have the necessary tools installed.

```sh
cd ../protos
npm install -g grpc-tools
grpc_tools_node_protoc --js_out=import_style=commonjs,binary:../routeguide/static_codegen/ --grpc_out=grpc_js:../routeguide/static_codegen/ route_guide.proto
```

--------------------------------

### Round Robin Load Balancing Example Output

Source: https://github.com/grpc/grpc-node/blob/master/examples/load_balancing/README.md

Output demonstrating the `round_robin` load balancing policy, where RPCs are distributed sequentially across available backend servers.

```text
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50052)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50052)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50052)
this is examples/load_balancing (from 0.0.0.0:50051)
this is examples/load_balancing (from 0.0.0.0:50052)
this is examples/load_balancing (from 0.0.0.0:50051)
```

--------------------------------

### Run gRPC Node.js Server Examples

Source: https://github.com/grpc/grpc-node/blob/master/examples/README.md

Execute the gRPC server using either dynamic or static code generation. The server will run in the background.

```sh
$ # from this directory
$ node ./helloworld/dynamic_codegen/greeter_server.js &
```

```sh
$ # OR
$ node ./helloworld/static_codegen/greeter_server.js &
```

--------------------------------

### Install @grpc/grpc-js-xds

Source: https://github.com/grpc/grpc-node/blob/master/packages/grpc-js-xds/README.md

Install the package using npm. Ensure you are using @grpc/grpc-js version 1.13.x or later.

```bash
npm install @grpc/grpc-js-xds
```

--------------------------------

### Get health.proto Path

Source: https://github.com/grpc/grpc-node/blob/master/packages/grpc-health-check/README.md

Obtain the absolute path to the health.proto file from the command line.

```bash
node -p 'require("grpc-health-check").protoPath'
```

--------------------------------

### Start the gRPC Client with Keepalive Tracing

Source: https://github.com/grpc/grpc-node/blob/master/examples/keepalive/README.md

Execute the client script with specific environment variables to enable detailed tracing for transport and keepalive mechanisms. This is useful for debugging keepalive behavior.

```bash
GRPC_TRACE=transport,keepalive GRPC_VERBOSITY=DEBUG node client.js
```

--------------------------------

### Run gRPC Node.js Client Examples

Source: https://github.com/grpc/grpc-node/blob/master/examples/README.md

Execute the gRPC client to interact with the running server. Use the client corresponding to the server's code generation method (dynamic or static).

```sh
$ # from this directory
$ node ./helloworld/dynamic_codegen/greeter_client.js
```

```sh
$ # OR
$ node ./helloworld/static_codegen/greeter_client.js
```

--------------------------------

### Generate gRPC Code with grpc_tools_node_protoc

Source: https://github.com/grpc/grpc-node/blob/master/examples/helloworld/static_codegen/README.md

Use `grpc_tools_node_protoc` to generate JavaScript and gRPC code from a .proto file. Ensure `grpc-tools` is installed globally and navigate to the directory containing the proto files.

```sh
cd ../protos
npm install -g grpc-tools
grpc_tools_node_protoc --js_out=import_style=commonjs,binary:../helloworld/static_codegen/ --grpc_out=grpc_js:../helloworld/static_codegen/ helloworld.proto
```

--------------------------------

### Generate TypeScript Types Command

Source: https://github.com/grpc/grpc-node/blob/master/packages/proto-loader/README.md

Example command to generate TypeScript types using specific options for handling longs, enums, defaults, oneofs, and specifying the gRPC library and output directory.

```sh
$(npm bin)/proto-loader-gen-types --longs=String --enums=String --defaults --oneofs --grpcLib=@grpc/grpc-js --outDir=proto/ proto/*.proto
```

--------------------------------

### Consume Generated TypeScript Types

Source: https://github.com/grpc/grpc-node/blob/master/packages/proto-loader/README.md

Example of how to import and use the generated TypeScript types in a gRPC server implementation. This includes loading the package definition and adding a service to a gRPC server.

```ts
import * as grpc from '@grpc/grpc-js';
import * as protoLoader from '@grpc/proto-loader';
import type { ProtoGrpcType } from './proto/example.ts';
import type { ExampleHandlers } from './proto/example_package/Example.ts';

const exampleServer: ExampleHandlers = {
  // server handlers implementation...
};

const packageDefinition = protoLoader.loadSync('./proto/example.proto');
const proto = (grpc.loadPackageDefinition(
  packageDefinition
) as unknown) as ProtoGrpcType;

const server = new grpc.Server();
server.addService(proto.example_package.Example.service, exampleServer);
```

--------------------------------

### Run the Client

Source: https://github.com/grpc/grpc-node/blob/master/examples/cancellation/README.md

Execute the client script to initiate an RPC and demonstrate cancellation.

```bash
node client.js
```

--------------------------------

### Run Server and Client

Source: https://github.com/grpc/grpc-node/blob/master/examples/load_balancing/README.md

Execute the server and client scripts to observe load balancing in action.

```bash
node server.js
```

```bash
node client.js
```

--------------------------------

### Load Protobuf Definition Synchronously

Source: https://github.com/grpc/grpc-node/blob/master/packages/proto-loader/README.md

Load a .proto file synchronously and then load the package definition into the gRPC library. Use this method when blocking the event loop is acceptable.

```js
const packageDefinition = protoLoader.loadSync(protoFileName, options);
const packageObject = grpcLibrary.loadPackageDefinition(packageDefinition);
```

--------------------------------

### Configure Client-Side Compression

Source: https://github.com/grpc/grpc-node/blob/master/doc/compression.md

Instantiate a client with options to set the default compression algorithm and level for sending and receiving messages.

```javascript
client = new ExampleClient("example.com", credentials.createInsecure(), {'grpc.default_compression_algorithm': 2, 'grpc.default_compression_level': 2});
```

--------------------------------

### Enable Full Debug Logging

Source: https://github.com/grpc/grpc-node/blob/master/examples/debugging/README.md

To enable full debug logging, run your code with the GRPC_TRACE and GRPC_VERBOSITY environment variables set to 'all' and 'DEBUG' respectively.

```bash
GRPC_TRACE=all GRPC_VERBOSITY=DEBUG
```

--------------------------------

### Load Protobuf Definition Asynchronously

Source: https://github.com/grpc/grpc-node/blob/master/packages/proto-loader/README.md

Load a .proto file asynchronously and then load the package definition into the gRPC library. This method is suitable for non-blocking operations.

```js
const protoLoader = require('@grpc/proto-loader');
const grpcLibrary = require('grpc');
// OR
const grpcLibrary = require('@grpc/grpc-js');

protoLoader.load(protoFileName, options).then(packageDefinition => {
  const packageObject = grpcLibrary.loadPackageDefinition(packageDefinition);
});
```

--------------------------------

### Add Reflection Service to gRPC Server

Source: https://github.com/grpc/grpc-node/blob/master/packages/grpc-reflection/README.md

Load your gRPC package definition and create a ReflectionService instance. Add this instance to your existing gRPC server to enable reflection capabilities.

```typescript
import { ReflectionService } from '@grpc/reflection';

const pkg = protoLoader.load(...); // Load your gRPC package definition as normal

// Create the reflection implementation based on your gRPC package and add it to your existing server
const reflection = new ReflectionService(pkg);
reflection.addToServer(server);
```

--------------------------------

### Enable Channel Connectivity Tracing in grpc-js

Source: https://github.com/grpc/grpc-node/blob/master/TROUBLESHOOTING.md

Combine GRPC_VERBOSITY=debug with GRPC_TRACE=connectivity_state to print information about channel state changes. This helps diagnose connectivity issues.

```bash
# Print information about channel state changes
GRPC_VERBOSITY=debug GRPC_TRACE=connectivity_state ./helloworld_application_using_grpc
```

--------------------------------

### Enable Multiple Tracers and Debug Logs in grpc-js

Source: https://github.com/grpc/grpc-node/blob/master/TROUBLESHOOTING.md

Enable logs from multiple internal components like channel, subchannel, and call_stream by specifying them in GRPC_TRACE, alongside debug logging via GRPC_VERBOSITY=debug.

```bash
# Print info from 3 different tracers, including tracing logs with log level DEBUG
GRPC_VERBOSITY=debug GRPC_TRACE=channel,subchannel,call_stream ./helloworld_application_using_grpc
```

--------------------------------

### Create TLS Client Credentials

Source: https://github.com/grpc/grpc-node/blob/master/examples/encryption/README.md

Use `grpc.credentials.createSsl` to generate client-side TLS credentials for secure connections. Ensure you have the CA certificate to verify the server.

```javascript
const grpc = require('@grpc/grpc-js');
const PROTO_PATH = __dirname + '/../proto/helloworld.proto';

const client = new hello_proto.Greeter(serverAddress, grpc.credentials.createSsl(rootCert));
```

--------------------------------

### Create TLS Server Credentials

Source: https://github.com/grpc/grpc-node/blob/master/examples/encryption/README.md

Use `grpc.ServerCredentials.createSsl` to generate server-side TLS credentials. This requires the server's certificate and private key.

```javascript
const serverCredentials = grpc.ServerCredentials.createSsl(rootCert, {
  cert_chain: serverCert, key: serverKey,
});
```

--------------------------------

### Register xDS Support in @grpc/grpc-js

Source: https://github.com/grpc/grpc-node/blob/master/packages/grpc-js-xds/README.md

Register the xDS plugin to enable its functionality. Then, instantiate a gRPC client using the 'xds://' URL scheme.

```typescript
import * as grpcJsXds from '@grpc/grpc-js-xds';
grpcJsXds.register();

// ...get a @grpc/grpc-js Client class as usual

const client = new MyServiceClient('xds:///example.com:123');
```

--------------------------------

### Proto Loader Gen Types CLI Usage

Source: https://github.com/grpc/grpc-node/blob/master/packages/proto-loader/README.md

Command-line interface for generating TypeScript types. Use this to specify options and input proto files.

```bash
proto-loader-gen-types.js [options] filenames...

Options:
      --help                 Show help                                 [boolean]
      --version              Show version number                       [boolean]
      --keepCase             Preserve the case of field names
                                                      [boolean] [default: false]
      --longs                The type that should be used to output 64 bit
                             integer values. Can be String, Number
                                                      [string] [default: "Long"]
      --enums                The type that should be used to output enum fields.
                             Can be String          [string] [default: "number"]
      --bytes                The type that should be used to output bytes
                             fields. Can be String, Array
                                                    [string] [default: "Buffer"]
      --defaults             Output default values for omitted fields
                                                      [boolean] [default: false]
      --arrays               Output default values for omitted repeated fields
                             even if --defaults is not set
                                                      [boolean] [default: false]
      --objects              Output default values for omitted message fields
                             even if --defaults is not set
                                                      [boolean] [default: false]
      --oneofs               Output virtual oneof fields set to the present
                             field's name             [boolean] [default: false]
      --json                 Represent Infinity and NaN as strings in float
                             fields. Also decode google.protobuf.Any
                             automatically            [boolean] [default: false]
      --includeComments      Generate doc comments from comments in the original
                             files                    [boolean] [default: false]
  -I, --includeDirs          Directories to search for included files    [array]
  -O, --outDir               Directory in which to output files
                                                             [string] [required]
      --grpcLib              The gRPC implementation library that these types
                             will be used with. If not provided, some types will
                             not be generated                           [string]
      --inputTemplate        Template for mapping input or "permissive" type
                             names                      [string] [default: "%s"]
      --outputTemplate       Template for mapping output or "restricted" type
                             names              [string] [default: "%s__Output"]
      --inputBranded         Output property for branded type for  "permissive"
                             types with fullName of the Message as its value
                                                      [boolean] [default: false]
      --outputBranded        Output property for branded type for  "restricted"
                             types with fullName of the Message as its value
                                                      [boolean] [default: false]
      --targetFileExtension  File extension for generated files.
                                                       [string] [default: ".ts"]
      --importFileExtension  File extension for import specifiers in generated
                             code.                        [string] [default: ""]
```

--------------------------------

### Provide Retry Policy as Channel Option

Source: https://github.com/grpc/grpc-node/blob/master/examples/retry/README.md

Instantiate a gRPC client with a retry policy by passing the service configuration as a channel option. This ensures that the client uses the defined retry strategy for its calls.

```javascript
const client = new Echo('localhost:50052', grpc.credentials.createInsecure(), { 'grpc.service_config': JSON.stringify(serviceConfig) });

```

--------------------------------

### Create mTLS Client Credentials

Source: https://github.com/grpc/grpc-node/blob/master/examples/encryption/README.md

Generate client credentials for mutual TLS by providing the client's certificate and private key. This allows the client to authenticate itself to the server.

```javascript
const clientCredentials = grpc.credentials.createSsl(rootCert, serverCert, serverKey);
const client = new hello_proto.Greeter(serverAddress, clientCredentials);
```

--------------------------------

### Create mTLS Server Credentials

Source: https://github.com/grpc/grpc-node/blob/master/examples/encryption/README.md

Configure server credentials for mutual TLS by providing CA certificates for client verification and setting `checkClientCertificate` to true. This ensures both server and client authenticate each other.

```javascript
const serverCredentials = grpc.ServerCredentials.createSsl(clientCaCert, {
  cert_chain: serverCert, key: serverKey,
}, true);
server.bindAsync(serverAddress, serverCredentials, (err, port) => {
  // ...
});
```

--------------------------------

### Enable Debug Logs for grpc-js Application

Source: https://github.com/grpc/grpc-node/blob/master/TROUBLESHOOTING.md

Use GRPC_VERBOSITY=debug to enable debug logs for your application. This setting increases the amount of information printed to stderr.

```bash
# Enable debug logs for an application
GRPC_VERBOSITY=debug ./helloworld_application_using_grpc
```

--------------------------------

### Trivial Node gRPC Server Interceptor

Source: https://github.com/grpc/grpc-node/blob/master/examples/interceptors/README.md

A basic server interceptor demonstrating how to wrap a call object with a ServerInterceptingCall. Use this to intercept incoming operations.

```javascript
const interceptor = function(methodDescriptor, call) {
  const responder = {
    start: function(next) {
      const listener = {
        onReceiveMetadata: function(metadata, next) {
          next(metadata);
        },
        onReceiveMessage: function(message, next) {
          next(message);
        },
        onReceiveHalfClose: function(next) {
          next();
        },
        onCancel: function() {
        }
      };
      next(listener);
    },
    sendMetadata: function(metadata, next) {
      next(metadata);
    },
    sendMessage: function(message, next) {
      next(message);
    },
    sendStatus: function(status, next) {
      next(status);
    }
  };
  return new ServerInterceptingCall(call, responder);
}
```

--------------------------------

### Add Health Check Service to gRPC Server

Source: https://github.com/grpc/grpc-node/blob/master/packages/grpc-health-check/README.md

Integrate the HealthImplementation into an existing gRPC-node server to enable health checks. Define a status map for services, including the overall server status represented by an empty string key.

```typescript
// Import package
import { HealthImplementation, ServingStatusMap } from 'grpc-health-check';

// Define service status map. Key is the service name, value is the corresponding status.
// By convention, the empty string '' key represents that status of the entire server.
const statusMap = {
  'ServiceFoo': 'SERVING',
  'ServiceBar': 'NOT_SERVING',
  '': 'NOT_SERVING',
};

// Construct the service implementation
const healthImpl = new HealthImplementation(statusMap);

healthImpl.addToServer(server);

// When ServiceBar comes up
healthImpl.setStatus('serviceBar', 'SERVING');
```

--------------------------------

### Trivial Node gRPC Client Interceptor

Source: https://github.com/grpc/grpc-node/blob/master/examples/interceptors/README.md

A basic client interceptor demonstrating how to wrap a call object with an InterceptingCall. Use this to intercept outgoing operations.

```javascript
const interceptor = function(options, nextCall) {
  const requester = {
    start: function(metadata, listener, next) {
      const listener = {
          onReceiveMetadata: function(metadata, next) {
            next(metadata);
          },
          onReceiveMessage: function(message, next) {
            next(message);
          },
          onReceiveStatus: function(status, next) {
            next(status);
          }
      };
      next(metadata, listener);
    },
    sendMessage: function(message, next) {
      next(messasge);
    },
    halfClose: function(next) {
      next();
    },
    cancel: function(message, next) {
      next();
    }
  };
  return new InterceptingCall(nextCall(options), requester);
};
```

--------------------------------

### Define Retry Policy for gRPC Method

Source: https://github.com/grpc/grpc-node/blob/master/examples/retry/README.md

Configure a retry policy within the service config for a specific gRPC method. This policy dictates how the client should handle retries, including the number of attempts and backoff strategy.

```javascript
const serviceConfig = {
  loadBalancingConfig: [],
  methodConfig: [
    {
      name: [
        {
          service: 'grpc.examples.echo.Echo',
        },
      ],
      retryPolicy: {
        maxAttempts: 4,
        initialBackoff: '0.01s',
        maxBackoff: '0.01s',
        backoffMultiplier: 1.0,
        retryableStatusCodes: ['UNAVAILABLE'],
      },
    },
  ],
};

```

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