diff --git a/.travis.yml b/.travis.yml
index 662d3d29..dd56fb78 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,10 +7,6 @@ node_js:
   - "8"
   - "9"
 
-cache:
-  directories:
-  - node_modules/
-
 script:
   - npm test
 
diff --git a/package-lock.json b/package-lock.json
index b55b72b1..a4d62fdc 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5,17 +5,18 @@
   "requires": true,
   "dependencies": {
     "@types/form-data": {
-      "version": "2.2.0",
-      "resolved": "https://registry.npmjs.org/@types/form-data/-/form-data-2.2.0.tgz",
-      "integrity": "sha512-vm5OGsKc61Sx/GTRMQ9d0H0PYCDebT78/bdIBPCoPEHdgp0etaH1RzMmkDygymUmyXTj3rdWQn0sRUpYKZzljA==",
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/@types/form-data/-/form-data-2.2.1.tgz",
+      "integrity": "sha512-JAMFhOaHIciYVh8fb5/83nmuO/AHwmto+Hq7a9y8FzLDcC1KCU344XDOMEmahnrTFlHjgh4L0WJFczNIX2GxnQ==",
       "dev": true,
       "requires": {
-        "@types/node": "8.0.47"
+        "@types/node": "8.0.52"
       }
     },
     "@types/lodash": {
-      "version": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.80.tgz",
-      "integrity": "sha1-pri3kA5qfcvC6Q2bbfvj9qf2mVE=",
+      "version": "4.14.85",
+      "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.85.tgz",
+      "integrity": "sha512-HrZiwDl62if0z31+rB99CLlg7WzS7b+KmyW75XAHEl/ZG0De2ACo6skZ89Zh3jOWkjKObN0Apq3MUezg7u9NKQ==",
       "dev": true
     },
     "@types/lodash.isstring": {
@@ -24,7 +25,7 @@
       "integrity": "sha512-YApcAY9vCq2zoV8b+6ebfPft3/D6OPjBswoNnRxywBtYO2A8bnaP4l3S/Nt0mbAUbOYJbr+N1q6boAnxKaq1eA==",
       "dev": true,
       "requires": {
-        "@types/lodash": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.80.tgz"
+        "@types/lodash": "4.14.85"
       }
     },
     "@types/lodash.merge": {
@@ -33,7 +34,7 @@
       "integrity": "sha512-bOCCutkbehfCeiSqJO5XcVKjsJvX28dgvjhs4aMmBAHAsOy2oOJQwHuIZ0elI1E94qQIdEsCvz8oLgUumd6teA==",
       "dev": true,
       "requires": {
-        "@types/lodash": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.80.tgz"
+        "@types/lodash": "4.14.85"
       }
     },
     "@types/mocha": {
@@ -48,13 +49,13 @@
       "integrity": "sha1-H75b3suUPBCad4VT+k0kAcuTlLQ=",
       "dev": true,
       "requires": {
-        "@types/node": "8.0.47"
+        "@types/node": "8.0.52"
       }
     },
     "@types/node": {
-      "version": "8.0.47",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.0.47.tgz",
-      "integrity": "sha512-kOwL746WVvt/9Phf6/JgX/bsGQvbrK5iUgzyfwZNcKVFcjAUVSpF9HxevLTld2SG9aywYHOILj38arDdY1r/iQ==",
+      "version": "8.0.52",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-8.0.52.tgz",
+      "integrity": "sha512-wOU/VRodnI/4Chxuu6R6bcyN9aE3rztO0i8R76PZO7+DxTXWy60nseGN4ujspucmxrfj5mzgCYPXiXqrD6KC3Q==",
       "dev": true
     },
     "@types/request": {
@@ -63,10 +64,44 @@
       "integrity": "sha512-hlkmO+M7Xxx13YZwqQtXGC03KxcYbqmDQg3oHMRVODfSk2u0BELK7RfTNROisvrLRGOYdGoZPpnHwaPoKrPMbA==",
       "dev": true,
       "requires": {
-        "@types/form-data": "2.2.0",
-        "@types/node": "8.0.47"
+        "@types/form-data": "2.2.1",
+        "@types/node": "8.0.52"
+      }
+    },
+    "abbrev": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
+      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
+      "dev": true
+    },
+    "ajv": {
+      "version": "5.3.0",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-5.3.0.tgz",
+      "integrity": "sha1-RBT/dKUIecII7l/cgm4ywwNUnto=",
+      "requires": {
+        "co": "4.6.0",
+        "fast-deep-equal": "1.0.0",
+        "fast-json-stable-stringify": "2.0.0",
+        "json-schema-traverse": "0.3.1"
+      }
+    },
+    "align-text": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz",
+      "integrity": "sha1-DNkKVhCT810KmSVsIrcGlDP60Rc=",
+      "dev": true,
+      "requires": {
+        "kind-of": "3.2.2",
+        "longest": "1.0.1",
+        "repeat-string": "1.6.1"
       }
     },
+    "amdefine": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.1.tgz",
+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
+      "dev": true
+    },
     "ansi-align": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-2.0.0.tgz",
@@ -83,34 +118,24 @@
       "dev": true
     },
     "ansi-regex": {
-      "version": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
       "integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
       "dev": true
     },
     "ansi-styles": {
-      "version": "3.2.0",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.0.tgz",
-      "integrity": "sha512-NnSOmMEYtVR2JVMIGTzynRkkaxtiq1xnFBcdQD/DnNCYPoEPsVJhM98BDyaoNOQIi7p4okdi3E27eN7GQbsUug==",
+      "version": "2.2.1",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+      "integrity": "sha1-tDLdM1i2NM914eRmQ2gkBTPB3b4=",
+      "dev": true
+    },
+    "argparse": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.9.tgz",
+      "integrity": "sha1-c9g7wmP4bpf4zE9rrhsOkKfSLIY=",
       "dev": true,
       "requires": {
-        "color-convert": "1.9.0"
-      },
-      "dependencies": {
-        "color-convert": {
-          "version": "1.9.0",
-          "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.0.tgz",
-          "integrity": "sha1-Gsz5fdc5uYO/mU1W/sj5WFNkG3o=",
-          "dev": true,
-          "requires": {
-            "color-name": "1.1.3"
-          }
-        },
-        "color-name": {
-          "version": "1.1.3",
-          "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
-          "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
-          "dev": true
-        }
+        "sprintf-js": "1.0.3"
       }
     },
     "array-find-index": {
@@ -119,18 +144,82 @@
       "integrity": "sha1-3wEKoSh+Fku9pvlyOwqWoexBh6E=",
       "dev": true
     },
+    "asn1": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
+      "integrity": "sha1-2sh4dxPJlmhJ/IGAd36+nB3fO4Y="
+    },
+    "assert-plus": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-1.0.0.tgz",
+      "integrity": "sha1-8S4PPF13sLHN2RRpQuTpbB5N1SU="
+    },
+    "assertion-error": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/assertion-error/-/assertion-error-1.0.2.tgz",
+      "integrity": "sha1-E8pRXYYgbaC6xm6DTdOX2HWBCUw=",
+      "dev": true
+    },
     "async": {
       "version": "1.5.2",
       "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz",
       "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=",
       "dev": true
     },
+    "asynckit": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz",
+      "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k="
+    },
+    "aws-sign2": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.7.0.tgz",
+      "integrity": "sha1-tG6JCTSpWR8tL2+G1+ap8bP+dqg="
+    },
+    "aws4": {
+      "version": "1.6.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.6.0.tgz",
+      "integrity": "sha1-g+9cqGCysy5KDe7e6MdxudtXRx4="
+    },
+    "babel-code-frame": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+      "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+      "dev": true,
+      "requires": {
+        "chalk": "1.1.3",
+        "esutils": "2.0.2",
+        "js-tokens": "3.0.2"
+      }
+    },
     "balanced-match": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
       "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
       "dev": true
     },
+    "base64url": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/base64url/-/base64url-2.0.0.tgz",
+      "integrity": "sha1-6sFuA+oUOO/5Qj1puqNiYu0fcLs="
+    },
+    "bcrypt-pbkdf": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz",
+      "integrity": "sha1-Y7xdy2EzG5K8Bf1SiVPDNGKgb40=",
+      "optional": true,
+      "requires": {
+        "tweetnacl": "0.14.5"
+      }
+    },
+    "boom": {
+      "version": "4.3.1",
+      "resolved": "https://registry.npmjs.org/boom/-/boom-4.3.1.tgz",
+      "integrity": "sha1-T4owBctKfjiJ90kDD9JbluAdLjE=",
+      "requires": {
+        "hoek": "4.2.0"
+      }
+    },
     "boxen": {
       "version": "1.2.2",
       "resolved": "https://registry.npmjs.org/boxen/-/boxen-1.2.2.tgz",
@@ -152,7 +241,7 @@
           "integrity": "sha512-NnSOmMEYtVR2JVMIGTzynRkkaxtiq1xnFBcdQD/DnNCYPoEPsVJhM98BDyaoNOQIi7p4okdi3E27eN7GQbsUug==",
           "dev": true,
           "requires": {
-            "color-convert": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.0.tgz"
+            "color-convert": "1.9.1"
           }
         },
         "camelcase": {
@@ -168,16 +257,10 @@
           "dev": true,
           "requires": {
             "ansi-styles": "3.2.0",
-            "escape-string-regexp": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
+            "escape-string-regexp": "1.0.5",
             "supports-color": "4.5.0"
           }
         },
-        "has-flag": {
-          "version": "2.0.0",
-          "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-2.0.0.tgz",
-          "integrity": "sha1-6CB68cx7MNRGzHC3NLXovhj4jVE=",
-          "dev": true
-        },
         "supports-color": {
           "version": "4.5.0",
           "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-4.5.0.tgz",
@@ -199,11 +282,29 @@
         "concat-map": "0.0.1"
       }
     },
+    "browser-stdout": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.0.tgz",
+      "integrity": "sha1-81HTKWnTL6XXpVZxVCY9korjvR8=",
+      "dev": true
+    },
+    "buffer-equal-constant-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/buffer-equal-constant-time/-/buffer-equal-constant-time-1.0.1.tgz",
+      "integrity": "sha1-+OcRMvf/5uAaXJaXpMbz5I1cyBk="
+    },
     "builtin-modules": {
-      "version": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-1.1.1.tgz",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/builtin-modules/-/builtin-modules-1.1.1.tgz",
       "integrity": "sha1-Jw8HbFpywC9bZaR9+Uxf46J4iS8=",
       "dev": true
     },
+    "camelcase": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz",
+      "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8=",
+      "dev": true
+    },
     "camelcase-keys": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/camelcase-keys/-/camelcase-keys-2.1.0.tgz",
@@ -212,14 +313,6 @@
       "requires": {
         "camelcase": "2.1.1",
         "map-obj": "1.0.1"
-      },
-      "dependencies": {
-        "camelcase": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-2.1.1.tgz",
-          "integrity": "sha1-fB0W1nmhu+WcoCys7PsBHiAfWh8=",
-          "dev": true
-        }
       }
     },
     "capture-stack-trace": {
@@ -228,23 +321,44 @@
       "integrity": "sha1-Sm+gc5nCa7pH8LJJa00PtAjFVQ0=",
       "dev": true
     },
+    "caseless": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
+      "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw="
+    },
+    "center-align": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
+      "integrity": "sha1-qg0yYptu6XIgBBHL1EYckHvCt60=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "align-text": "0.1.4",
+        "lazy-cache": "1.0.4"
+      }
+    },
+    "chai": {
+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/chai/-/chai-3.5.0.tgz",
+      "integrity": "sha1-TQJjewZ/6Vi9v906QOxW/vc3Mkc=",
+      "dev": true,
+      "requires": {
+        "assertion-error": "1.0.2",
+        "deep-eql": "0.1.3",
+        "type-detect": "1.0.0"
+      }
+    },
     "chalk": {
-      "version": "2.3.0",
-      "resolved": "https://registry.npmjs.org/chalk/-/chalk-2.3.0.tgz",
-      "integrity": "sha512-Az5zJR2CBujap2rqXGaJKaPHyJ0IrUimvYNX+ncCy8PJP4ltOGTrHUIo097ZaL2zMeKYpiCdqDvS6zdrTFok3Q==",
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+      "integrity": "sha1-qBFcVeSnAv5NFQq9OHKCKn4J/Jg=",
       "dev": true,
       "requires": {
-        "ansi-styles": "3.2.0",
+        "ansi-styles": "2.2.1",
         "escape-string-regexp": "1.0.5",
-        "supports-color": "4.5.0"
-      },
-      "dependencies": {
-        "escape-string-regexp": {
-          "version": "1.0.5",
-          "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz",
-          "integrity": "sha1-G2HAViGQqN/2rjuyzwIAyhMLhtQ=",
-          "dev": true
-        }
+        "has-ansi": "2.0.0",
+        "strip-ansi": "3.0.1",
+        "supports-color": "2.0.0"
       }
     },
     "clang-format": {
@@ -279,6 +393,32 @@
       "integrity": "sha1-/xnt6Kml5XkyQUewwR8PvLq+1jk=",
       "dev": true
     },
+    "cliui": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-2.1.0.tgz",
+      "integrity": "sha1-S0dXYP+AJkx2LDoXGQMukcf+oNE=",
+      "dev": true,
+      "optional": true,
+      "requires": {
+        "center-align": "0.1.3",
+        "right-align": "0.1.3",
+        "wordwrap": "0.0.2"
+      },
+      "dependencies": {
+        "wordwrap": {
+          "version": "0.0.2",
+          "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz",
+          "integrity": "sha1-t5Zpu0LstAn4PVg8rVLKF+qhZD8=",
+          "dev": true,
+          "optional": true
+        }
+      }
+    },
+    "co": {
+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
+      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ="
+    },
     "code-point-at": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
@@ -286,18 +426,34 @@
       "dev": true
     },
     "color-convert": {
-      "version": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.0.tgz",
-      "integrity": "sha1-Gsz5fdc5uYO/mU1W/sj5WFNkG3o=",
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.1.tgz",
+      "integrity": "sha512-mjGanIiwQJskCC18rPR6OmrZ6fm2Lc7PeGFYwCmy5J34wC6F1PzdGL6xeMfmgicfYcNLGuVFA3WzXtIDCQSZxQ==",
       "dev": true,
       "requires": {
-        "color-name": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz"
+        "color-name": "1.1.3"
       }
     },
     "color-name": {
-      "version": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-name/-/color-name-1.1.3.tgz",
       "integrity": "sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=",
       "dev": true
     },
+    "combined-stream": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.5.tgz",
+      "integrity": "sha1-k4NwpXtKUd6ix3wV1cX9+JUWQAk=",
+      "requires": {
+        "delayed-stream": "1.0.0"
+      }
+    },
+    "commander": {
+      "version": "2.11.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-2.11.0.tgz",
+      "integrity": "sha512-b0553uYA5YAEGgyYIGYROzKQ7X5RAqedkfjiZxwi0kL1g3bOaBNNZfYkzt/CL0umgD5wc9Jec2FbB98CjkMRvQ==",
+      "dev": true
+    },
     "concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -316,16 +472,13 @@
         "unique-string": "1.0.0",
         "write-file-atomic": "2.3.0",
         "xdg-basedir": "3.0.0"
-      },
-      "dependencies": {
-        "graceful-fs": {
-          "version": "4.1.11",
-          "resolved": "https://registry.npmjs.org/graceful-fs/-/graceful-fs-4.1.11.tgz",
-          "integrity": "sha1-Dovf5NHduIVNZOBOp8AOKgJuVlg=",
-          "dev": true
-        }
       }
     },
+    "core-util-is": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
+    },
     "coveralls": {
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@@ -3716,6 +2803,11 @@
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@@ -3726,12 +2818,23 @@
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@@ -3760,11 +2863,24 @@
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@@ -3796,10 +2904,39 @@
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   }
 }
diff --git a/src/auth/googleauth.ts b/src/auth/googleauth.ts
index fa9f2686..a1cb77e0 100644
--- a/src/auth/googleauth.ts
+++ b/src/auth/googleauth.ts
@@ -35,6 +35,11 @@ export interface ProjectIdCallback {
   (err?: Error|null, projectId?: string): void;
 }
 
+export interface CredentialBody {
+  client_email?: string;
+  private_key?: string;
+}
+
 export class GoogleAuth {
   transporter: Transporter;
 
@@ -59,6 +64,8 @@ export class GoogleAuth {
   set cachedProjectId(projectId: string) {
     this._cachedProjectId = projectId;
   }
+  // To save the contents of the JSON credential file
+  jsonContent: JWTInput|null = null;
 
   cachedCredential: OAuth2Client|null = null;
 
@@ -389,6 +396,8 @@ export class GoogleAuth {
       }
       return;
     }
+    // Set the JSON contents
+    this.jsonContent = json;
     if (json.type === 'authorized_user') {
       client = new UserRefreshClient();
     } else {
@@ -634,4 +643,59 @@ export class GoogleAuth {
           if (callback) callback(null, body);
         });
   }
+
+
+  /**
+   * The callback function handles a credential object that contains the
+   * client_email and private_key (if exists).
+   * getCredentials checks for these values from the user JSON at first.
+   * If it doesn't exist, and the environment is on GCE, it gets the
+   * client_email from the cloud metadata server.
+   * @param callback Callback that handles the credential object that contains
+   * a client_email and optional private key, or the error.
+   * returned
+   */
+  getCredentials(
+      callback: (err: Error|null, credentials?: CredentialBody) => void) {
+    if (this.jsonContent) {
+      const credential: CredentialBody = {
+        client_email: this.jsonContent.client_email,
+        private_key: this.jsonContent.private_key
+      };
+      callback(null, credential);
+    } else {
+      this._checkIsGCE((err, gce) => {
+        if (err) {
+          callback(err);
+        } else if (!gce) {
+          callback(new Error('Unknown error.'));
+        } else {
+          // For GCE, return the service account details from the metadata
+          // server
+          this.transporter.request(
+              {
+                method: 'GET',
+                uri:
+                    'http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/?recursive=true',
+                headers: {'Metadata-Flavor': 'Google'}
+              },
+              (err, body, res) => {
+                if (err || !res || res.statusCode !== 200 || !body ||
+                    !body.default || !body.default.email) {
+                  if (callback) {
+                    callback(new Error('Failure from metadata server.'));
+                  }
+                } else {
+                  // Callback with the body
+                  const credential:
+                      CredentialBody = {client_email: body.default.email};
+                  if (callback) {
+                    callback(null, credential);
+                  }
+                }
+              });
+        }
+      });
+    }
+  }
 }
diff --git a/test/test.googleauth.ts b/test/test.googleauth.ts
index 3e2ec901..3850467a 100644
--- a/test/test.googleauth.ts
+++ b/test/test.googleauth.ts
@@ -130,7 +130,6 @@ function insertEnvironmentVariableIntoAuth(
 function insertWellKnownFilePathIntoAuth(
     auth: GoogleAuth, filePath: string, mockFilePath: string) {
   const originalMockWellKnownFilePathFunction = auth._mockWellKnownFilePath;
-
   auth._mockWellKnownFilePath = (kfpath: string) => {
     if (kfpath === filePath) {
       return mockFilePath;
@@ -1535,4 +1534,137 @@ describe('GoogleAuth', () => {
       });
     });
   });
+  describe('.getCredentials', () => {
+    it('should get metadata from the server when running on GCE', (done) => {
+      const auth = new GoogleAuth();
+      auth.transporter = new MockTransporter(true);
+      auth._checkIsGCE(() => {
+        // Assert that the flags are set.
+        assert.equal(true, auth.isGCE);
+        done();
+      });
+      const response = `{
+          "email":"test-creds@test-creds.iam.gserviceaccount.com",
+          "private_key": null
+        }`;
+      const scope =
+          nock('http://metadata.google.internal')
+              .get(
+                  '/computeMetadata/v1/instance/service-accounts/?recursive=true')
+              .reply(200, response);
+      auth.getCredentials((err, body) => {
+        assert(body);
+        assert.equal(
+            body!.client_email,
+            'test-creds@test-creds.iam.gserviceaccount.com');
+        assert.equal(body!.private_key, null);
+        scope.done();
+        done();
+      });
+    });
+    it('should error if metadata server is not reachable', (done) => {
+      const auth = new GoogleAuth();
+      auth.transporter = new MockTransporter(true);
+      auth._checkIsGCE(() => {
+        // Assert that the flags are set.
+        assert.equal(true, auth.isGCE);
+        done();
+      });
+      const scope =
+          nock('http://metadata.google.internal')
+              .get(
+                  '/computeMetadata/v1/instance/service-accounts/?recursive=true')
+              .reply(404);
+      auth.getCredentials((err, body) => {
+        assert.equal(true, err instanceof Error);
+        scope.done();
+        done();
+      });
+    });
+    it('should error if body is empty', (done) => {
+      const auth = new GoogleAuth();
+      auth.transporter = new MockTransporter(true);
+      auth._checkIsGCE(() => {
+        // Assert that the flags are set.
+        assert.equal(true, auth.isGCE);
+        done();
+      });
+      const scope =
+          nock('http://metadata.google.internal')
+              .get(
+                  '/computeMetadata/v1/instance/service-accounts/?recursive=true')
+              .reply(200, {});
+      auth.getCredentials((err, body) => {
+        assert.equal(true, err instanceof Error);
+        scope.done();
+        done();
+      });
+    });
+    it('should handle valid environment variable', (done) => {
+      // Set up a mock to return path to a valid credentials file.
+      const auth = new GoogleAuth();
+      blockGoogleApplicationCredentialEnvironmentVariable(auth);
+      insertEnvironmentVariableIntoAuth(
+          auth, 'GOOGLE_APPLICATION_CREDENTIALS',
+          './test/fixtures/private.json');
+      // Execute.
+      auth._tryGetApplicationCredentialsFromEnvironmentVariable(
+          (err, result) => {
+            assert(result);
+            assert.equal(null, err);
+            const jwt = result as JWT;
+            it('should return the credentials from file', (done2) => {
+              auth.getCredentials((_err, body) => {
+                assert.notEqual(null, body);
+                assert.equal(jwt.email, body!.client_email);
+                assert.equal(jwt.key, body!.private_key);
+                done2();
+              });
+            });
+            done();
+          });
+    });
+    it('should handle valid file path', (done) => {
+      // Set up a mock to return path to a valid credentials file.
+      const auth = new GoogleAuth();
+      blockGoogleApplicationCredentialEnvironmentVariable(auth);
+      insertEnvironmentVariableIntoAuth(auth, 'APPDATA', 'foo');
+      auth._pathJoin = pathJoin;
+      auth._osPlatform = () => 'win32';
+      auth._fileExists = () => true;
+      auth._checkIsGCE = callsBack(null, true);
+      insertWellKnownFilePathIntoAuth(
+          auth, 'foo:gcloud:application_default_credentials.json',
+          './test/fixtures/private2.json');
+      // Execute.
+      auth.getApplicationDefault((err, result) => {
+        assert.notEqual(true, err instanceof Error);
+        assert(result);
+        assert.equal(null, err);
+        const jwt = result as JWT;
+        it('should return the credentials from file', (done2) => {
+          auth.getCredentials((_err, body) => {
+            assert.notEqual(null, body);
+            assert.equal(jwt.email, body!.client_email);
+            assert.equal(jwt.key, body!.private_key);
+            done2();
+          });
+        });
+        done();
+      });
+    });
+    it('should return error when env const is not set', (done) => {
+      // Set up a mock to return a null path string
+      const auth = new GoogleAuth();
+      let credentialFlag: boolean;
+      insertEnvironmentVariableIntoAuth(auth, 'GOOGLE_APPLICATION_CREDENTIALS');
+      credentialFlag =
+          auth._tryGetApplicationCredentialsFromEnvironmentVariable();
+      assert.equal(false, credentialFlag);
+      auth.getCredentials((_err, body) => {
+        assert.equal(true, _err instanceof Error);
+        done();
+      });
+    });
+  });
 });