diff --git a/index.js b/index.js
new file mode 100644
index 0000000..baaacb5
--- /dev/null
+++ b/index.js
@@ -0,0 +1,8 @@
+var Cloudevent = require('./lib/cloudevent.js');
+//var Spec_0_1   = require('./lib/spec_0_1.js');
+//var Spec_0_2   = require('./lib/spec_0_2.js');
+
+module.exports = Cloudevent;
+//module.exports.Spec_0_1   = Spec_0_1;
+//module.exports.Spec_0_2   = Spec_0_2;
+
diff --git a/lib/cloudevent.js b/lib/cloudevent.js
new file mode 100644
index 0000000..318b5ac
--- /dev/null
+++ b/lib/cloudevent.js
@@ -0,0 +1,34 @@
+var Spec_0_1      = require('./spec_0_1.js');
+var Spec_0_2      = require('./spec_0_2.js');
+var JSONFormatter = require('./jsonformatter.js');
+
+function Cloudevent(_spec, _formatter){
+  this.spec      = (_spec) ? new _spec(Cloudevent) : new Spec_0_1(Cloudevent);
+  this.formatter = (_formatter) ? _formatter : new JSONFormatter();
+}
+
+Cloudevent.prototype.format = function(){
+  return this.formatter.format(this.spec.payload);
+}
+
+Cloudevent.prototype.toString = function(){
+  return this.formatter.toString(this.spec.payload);
+}
+
+Cloudevent.prototype.type = function(type){
+  this.spec.type(type);
+  return this;
+}
+
+Cloudevent.prototype.source = function(_source){
+  this.spec.source(_source);
+  return this;
+}
+
+Cloudevent.specs = {
+  '0.1': Spec_0_1,
+  '0.2': Spec_0_2
+};
+
+module.exports = Cloudevent;
+
diff --git a/lib/jsonformatter.js b/lib/jsonformatter.js
new file mode 100644
index 0000000..7f0ca46
--- /dev/null
+++ b/lib/jsonformatter.js
@@ -0,0 +1,14 @@
+
+function JSONFormatter(){
+
+}
+
+JSONFormatter.prototype.format = function(payload){
+  return payload;
+}
+
+JSONFormatter.prototype.toString = function(payload){
+  return JSON.stringify(payload);
+}
+
+module.exports = JSONFormatter;
diff --git a/lib/spec_0_1.js b/lib/spec_0_1.js
new file mode 100644
index 0000000..3b4e657
--- /dev/null
+++ b/lib/spec_0_1.js
@@ -0,0 +1,43 @@
+var uuid = require('uuid/v4');
+
+function Spec_0_1(_caller){
+  this.payload = {
+    cloudEventsVersion: '0.1',
+    eventID: uuid()
+  };
+
+  /*
+   * Used to inject backward compatibility functions or attributes.
+   */
+  this.caller = _caller;
+
+  /*
+   * Inject the method to set the version related to data attribute.
+   */
+  this.caller.prototype.eventTypeVersion = function(_version){
+    this.spec.eventTypeVersion(_version);
+  }
+}
+
+Spec_0_1.prototype.type = function(_type){
+  this.payload['eventType'] = _type;
+  return this;
+}
+
+Spec_0_1.prototype.eventTypeVersion = function(version){
+  this.payload['eventTypeVersion'] = version;
+  return this;
+}
+
+Spec_0_1.prototype.source = function(_source){
+  this.payload['source'] = _source;
+  return this;
+}
+
+Spec_0_1.prototype.id = function(_id){
+  this.payload['eventID'] = _id;
+  return this;
+}
+
+module.exports = Spec_0_1;
+
diff --git a/lib/spec_0_2.js b/lib/spec_0_2.js
new file mode 100644
index 0000000..de8fed8
--- /dev/null
+++ b/lib/spec_0_2.js
@@ -0,0 +1,26 @@
+var uuid = require('uuid/v4');
+
+function Spec_0_2(){
+  this.payload = {
+    specversion: '0.2',
+    id: uuid()
+  };
+}
+
+Spec_0_2.prototype.type = function(_type){
+  this.payload['type'] = _type;
+  return this;
+}
+
+Spec_0_2.prototype.source = function(_source){
+  this.payload['source'] = _source;
+  return this;
+}
+
+Spec_0_2.prototype.id = function(_id){
+  this.payload['id'] = _id;
+  return this;
+}
+
+module.exports = Spec_0_2;
+
diff --git a/package.json b/package.json
index b6827ec..93c5621 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
   "description": "CloudEvents SDK for JavaScript",
   "main": "index.js",
   "scripts": {
-    "test": "mocha test/test.js"
+    "test": "./node_modules/.bin/mocha -C test/*.js"
   },
   "repository": {
     "type": "git",
@@ -17,13 +17,20 @@
   ],
   "author": "cloudevents.io",
   "contributors": {
-    "name"  : "Fábio José de Moraes",
-    "email" : "fabiojose@gmail.com",
-    "url"   : "https://github.com/fabiojose"
+    "name": "Fábio José de Moraes",
+    "email": "fabiojose@gmail.com",
+    "url": "https://github.com/fabiojose"
   },
   "license": "Apache-2.0",
   "bugs": {
     "url": "https://github.com/cloudevents/sdk-javascript/issues"
   },
-  "homepage": "https://github.com/cloudevents/sdk-javascript#readme"
+  "homepage": "https://github.com/cloudevents/sdk-javascript#readme",
+  "dependencies": {
+    "uuid": "3.3.2"
+  },
+  "devDependencies": {
+    "chai": "4.2.0",
+    "mocha": "5.2.0"
+  }
 }
diff --git a/test/cloudevent_spec_0_1.js b/test/cloudevent_spec_0_1.js
new file mode 100644
index 0000000..b42d71d
--- /dev/null
+++ b/test/cloudevent_spec_0_1.js
@@ -0,0 +1,32 @@
+var expect       = require("chai").expect;
+var Cloudevent   = require("../index.js");
+
+var cloudevent = new Cloudevent()
+                       .type("com.github.pull.create")
+                       .source("urn:event:from:myapi/resourse/123");
+
+describe("CloudEvents Spec 0.1 - JavaScript SDK", () => {
+
+  describe("JSON Format", () => {
+
+    describe("Required context attributes", () => {
+      it("requires 'eventType'", () => {
+        expect(cloudevent.format()).to.have.property('eventType');
+      });
+
+      it("requires 'cloudEventsVersion'", () => {
+        expect(cloudevent.format()).to.have.property('cloudEventsVersion');
+      });
+
+      it("requires 'source'", () => {
+        expect(cloudevent.format()).to.have.property('source');
+      });
+
+      it("requires 'eventID'", () => {
+        expect(cloudevent.format()).to.have.property('eventID');
+      });
+    });
+
+  });
+
+});
diff --git a/test/cloudevent_spec_0_2.js b/test/cloudevent_spec_0_2.js
new file mode 100644
index 0000000..a94faa1
--- /dev/null
+++ b/test/cloudevent_spec_0_2.js
@@ -0,0 +1,32 @@
+var expect     = require("chai").expect;
+var Cloudevent = require("../index.js");
+
+var cloudevent = new Cloudevent(Cloudevent.specs['0.2'])
+                       .type("com.github.pull.create")
+                       .source("urn:event:from:myapi/resourse/123");
+
+describe("CloudEvents Spec 0.2 - JavaScript SDK", () => {
+
+  describe("JSON Format", () => {
+
+    describe("Required context attributes", () => {
+      it("requires 'type'", () => {
+        expect(cloudevent.format()).to.have.property('type');
+      });
+
+      it("requires 'specversion'", () => {
+        expect(cloudevent.format()).to.have.property('specversion');
+      });
+
+      it("requires 'source'", () => {
+        expect(cloudevent.format()).to.have.property('source');
+      });
+
+      it("requires 'id'", () => {
+        expect(cloudevent.format()).to.have.property('id');
+      });
+    });
+
+  });
+
+});