Google Speech Recognition with API key + gRPC

testApiKeyAndGrpc.js

/**
* Make sure you're not already authenticated with gRPC, on MacOS you need
* to ensure the GOOGLE_APPLICATION_CREDENTIALS environment variable is not
* set : `unset GOOGLE_APPLICATION_CREDENTIALS`
*
* @google-cloud/speech and google-gax are used to load the necessary .proto files
*
* I tried to add the 'key' to the request itself, or as a metadata with the request
* and always getting the following error from gRPC :
*  Error: 7 PERMISSION_DENIED: The request is missing a valid API key.
*/
var PROTO_PATH = __dirname + '/node_modules/\@google-cloud/speech/protos/google/cloud/speech/v1/cloud_speech.proto';

const grpc = require('grpc');
const fs = require('fs');
const merge = require('lodash.merge');
const gax = require('google-gax');
const path = require('path');

const API_KEY = 'INSERT YOUR API KEY HERE';
const fileName = './audio.raw';

const metadata = new grpc.Metadata();
metadata.add('x-goog-api-key', API_KEY);

// Load the applicable protos.
var protos = merge(
  {},
  gax.grpc().loadProto(
    path.join(__dirname, 'node_modules', '\@google-cloud', 'speech', 'protos'),
    'google/cloud/speech/v1/cloud_speech.proto'
  )
);

// Reads a local audio file and converts it to base64
const file = fs.readFileSync(fileName);
const audioBytes = file.toString('base64');

// The audio file's encoding, sample rate in hertz, and BCP-47 language code
const audio = {
  content: audioBytes,
};
const config = {
  encoding: 'LINEAR16',
  sampleRateHertz: 16000,
  languageCode: 'en-US',
};
const request = {
  audio: audio,
  config: config,
  key: API_KEY
};

const client = new protos.google.cloud.speech.v1.Speech('speech.googleapis.com:443', grpc.credentials.createSsl());

client.Recognize(request,
  metadata,
  function(err, response) {
    if (err) {
      console.log("ERR :", err);
      return;
    }
  
    console.log("RESPONSE :", response);
  });

Hello @phsultan,

Thank you for your answer, yes I have it in my code and its initialized

const speech = require('@google-cloud/speech')
const grpc = require('grpc')
const metadata = new grpc.Metadata()
const merge = require('lodash.merge')
const gax = require('google-gax')

module.exports = {
  path: '/api',
  handler: app
}

Here is the google-gax line in my package.json dependencies

    "dependencies": {
        "google-gax": "^2.11.2",

Have a nice day !