diff --git a/translate/README.md b/translate/README.md
index 73e6e022ea..f1763a09f5 100644
--- a/translate/README.md
+++ b/translate/README.md
@@ -39,19 +39,15 @@ Commands:
   translate <toLang> <input..>  Translates the provided text or texts to the target language.
 
 Options:
-  --apiKey, -k  Your Translate API key. Defaults to the value of the TRANSLATE_API_KEY environment variable.    [string]
-  --help        Show help                                                                                      [boolean]
+  --help  Show help                                                    [boolean]
 
 Examples:
-  node translate.js detect "Hello world!"                       Detects the language of "Hello world!".
-  node translate.js detect -k YOUR_API_KEY "Hello world!"       Detects the language of "Hello world!" and "Goodbye",
-  "Goodbye"                                                     supplying the API key inline.
-  node translate.js list -k YOUR_API_KEY                        Lists available translation languages with names in
-                                                                English, supplying the API key inline.
-  node translate.js list es                                     Lists available translation languages with names in
-                                                                Spanish.
-  node translate.js translate ru "Good morning!"                Translates "Good morning!" to Russian, auto-detecting
-                                                                the source language.
+  node translate.js detect "Hello world!"            Detects the language of "Hello world!".
+  node translate.js detect "Hello world!" "Goodbye"  Detects the language of "Hello world!" and "Goodbye".
+  node translate.js list                             Lists available translation languages with names in English.
+  node translate.js list es                          Lists available translation languages with names in Spanish.
+  node translate.js translate ru "Good morning!"     Translates "Good morning!" to Russian, auto-detecting the source
+                                                     language.
 
 For more information, see https://cloud.google.com/translate/docs
 ```
diff --git a/translate/quickstart.js b/translate/quickstart.js
index 456099f7c1..7bb0715b24 100644
--- a/translate/quickstart.js
+++ b/translate/quickstart.js
@@ -19,12 +19,12 @@
 // Imports the Google Cloud client library
 const Translate = require('@google-cloud/translate');
 
-// Your Translate API key
-const apiKey = 'YOUR_API_KEY';
+// Your Google Cloud Platform project ID
+const projectId = 'YOUR_PROJECT_ID';
 
 // Instantiates a client
 const translateClient = Translate({
-  key: apiKey
+  projectId: projectId
 });
 
 // The text to translate
diff --git a/translate/system-test/quickstart.test.js b/translate/system-test/quickstart.test.js
index 853dc489a9..d41753da33 100644
--- a/translate/system-test/quickstart.test.js
+++ b/translate/system-test/quickstart.test.js
@@ -16,9 +16,7 @@
 'use strict';
 
 const proxyquire = require(`proxyquire`).noPreserveCache();
-const translate = proxyquire(`@google-cloud/translate`, {})({
-  key: process.env.TRANSLATE_API_KEY
-});
+const translate = proxyquire(`@google-cloud/translate`, {})();
 
 describe(`translate:quickstart`, () => {
   it(`should translate a string`, (done) => {
diff --git a/translate/system-test/translate.test.js b/translate/system-test/translate.test.js
index 942c08ae1b..092bc20098 100644
--- a/translate/system-test/translate.test.js
+++ b/translate/system-test/translate.test.js
@@ -25,13 +25,7 @@ const text = `Hello world!`;
 const toLang = `ru`;
 
 describe(`translate:translate`, () => {
-  const translate = Translate({
-    key: process.env.TRANSLATE_API_KEY
-  });
-  if (!process.env.TRANSLATE_API_KEY) {
-    process.stdout.write(`Skipping Translate API tests...\n`);
-    return;
-  }
+  const translate = Translate();
 
   it(`should detect language`, () => {
     const output = run(`${cmd} detect "${text}"`, cwd);
diff --git a/translate/translate.js b/translate/translate.js
index f4487dbc3d..11b9872bfb 100644
--- a/translate/translate.js
+++ b/translate/translate.js
@@ -20,11 +20,7 @@ const Translate = require('@google-cloud/translate');
 // [START translate_detect_language]
 function detectLanguage (input) {
   // Instantiates a client
-  const translate = Translate({
-    // The Translate API uses an API key for authentication. This sample looks
-    // for the key in an environment variable.
-    key: process.env.TRANSLATE_API_KEY
-  });
+  const translate = Translate();
 
   // Detects the language. "input" can be a string for detecting the language of
   // a single piece of text, or an array of strings for detecting the languages
@@ -41,11 +37,7 @@ function detectLanguage (input) {
 // [START translate_list_codes]
 function listLanguages () {
   // Instantiates a client
-  const translate = Translate({
-    // The Translate API uses an API key for authentication. This sample looks
-    // for the key in an environment variable.
-    key: process.env.TRANSLATE_API_KEY
-  });
+  const translate = Translate();
 
   // Lists available translation language with their names in English (the default).
   return translate.getLanguages()
@@ -62,11 +54,7 @@ function listLanguages () {
 // [START translate_list_language_names]
 function listLanguagesWithTarget (target) {
   // Instantiates a client
-  const translate = Translate({
-    // The Translate API uses an API key for authentication. This sample looks
-    // for the key in an environment variable.
-    key: process.env.TRANSLATE_API_KEY
-  });
+  const translate = Translate();
 
   // Lists available translation language with their names in a target language
   return translate.getLanguages(target)
@@ -83,11 +71,7 @@ function listLanguagesWithTarget (target) {
 // [START translate_translate_text]
 function translateText (input, target) {
   // Instantiates a client
-  const translate = Translate({
-    // The Translate API uses an API key for authentication. This sample looks
-    // for the key in an environment variable.
-    key: process.env.TRANSLATE_API_KEY
-  });
+  const translate = Translate();
 
   // Translates the text into the target language. "input" can be a string for
   // translating a single piece of text, or an array of strings for translating
@@ -105,15 +89,9 @@ function translateText (input, target) {
 require(`yargs`)
   .demand(1)
   .command(`detect <input..>`, `Detects the language of the provided text or texts`, {}, (opts) => {
-    if (!process.env.TRANSLATE_API_KEY) {
-      process.env.TRANSLATE_API_KEY = opts.apiKey;
-    }
     detectLanguage(opts.input);
   })
   .command(`list [target]`, `Lists available translation languages. To return language names in a language other than English, specify a target language.`, {}, (opts) => {
-    if (!process.env.TRANSLATE_API_KEY) {
-      process.env.TRANSLATE_API_KEY = opts.apiKey;
-    }
     if (opts.target) {
       listLanguagesWithTarget(opts.target);
     } else {
@@ -121,22 +99,11 @@ require(`yargs`)
     }
   })
   .command(`translate <toLang> <input..>`, `Translates the provided text or texts to the target language.`, {}, (opts) => {
-    if (!process.env.TRANSLATE_API_KEY) {
-      process.env.TRANSLATE_API_KEY = opts.apiKey;
-    }
     translateText(opts.input, opts.toLang);
   })
-  .option(`apiKey`, {
-    alias: `k`,
-    global: true,
-    requiresArg: true,
-    default: process.env.TRANSLATE_API_KEY,
-    type: `string`,
-    description: `Your Translate API key. Defaults to the value of the TRANSLATE_API_KEY environment variable.`
-  })
   .example(`node $0 detect "Hello world!"`, `Detects the language of "Hello world!".`)
-  .example(`node $0 detect -k YOUR_API_KEY "Hello world!" "Goodbye"`, `Detects the language of "Hello world!" and "Goodbye", supplying the API key inline.`)
-  .example(`node $0 list -k YOUR_API_KEY`, `Lists available translation languages with names in English, supplying the API key inline.`)
+  .example(`node $0 detect "Hello world!" "Goodbye"`, `Detects the language of "Hello world!" and "Goodbye".`)
+  .example(`node $0 list`, `Lists available translation languages with names in English.`)
   .example(`node $0 list es`, `Lists available translation languages with names in Spanish.`)
   .example(`node $0 translate ru "Good morning!"`, `Translates "Good morning!" to Russian, auto-detecting the source language.`)
   .wrap(120)