Working with Taxonomy and Javascript object model in SharePoint 2013

In SharePoint 2010, it was not possible to work with taxonomy types using javascript object model. SharePoint 2013 has introduced a new feature to work with taxonomy by using SP.Taxonomy.js

Here are some basic operations of taxonomy using javascipt object model.
1. Create a taxonomy Term Group
2. Create a taxonomy Term Set
3. Create taxonomy Terms
4. Read taxonomy group, termset and terms.

 var groupGuid="cd90a241-2737-48f7-b5a3-43fab9cdc0cb";  
 var termSetGuid="552ae870-07ce-4934-b5c7-c068022a6873";  
 jQuery(function($) {  
      var scriptbase = _spPageContextInfo.webServerRelativeUrl + "_layouts/15/";  
      $.getScript(scriptbase + "SP.Runtime.js",  
     function () {  
       $.getScript(scriptbase + "SP.js", function(){  
            $.getScript(scriptbase + "SP.Taxonomy.js", ExecuteTaxonomyFunctions);  
       });  
     }  
   );  
 });  
 function ExecuteTaxonomyFunctions()  
 {  
      CreateTaxonomyGroup();  
      CreateTermSet();  
      CreateTerms();  
      ReadTerms();  
 }  
 function CreateTaxonomyGroup()  
 {  
      var context = SP.ClientContext.get_current();  
      //Get the taxonomy session object  
   var taxSession = SP.Taxonomy.TaxonomySession.getTaxonomySession(context);  
   //Get the default termstore for the site collection  
   var termStore =taxSession.getDefaultSiteCollectionTermStore();  
      //New group with new guid  
      var newGroup = termStore.createGroup("IT",groupGuid);  
      context.load(newGroup);  
      context.executeQueryAsync(function(){  
            alert("Group Created with Name : "+ newGroup.get_name());  
      },function(sender,args){  
           alert(args.get_message());  
      });  
 }  
 function CreateTermSet()  
 {  
   var context = SP.ClientContext.get_current();  
   //Get the taxonomy session object  
   var taxSession = SP.Taxonomy.TaxonomySession.getTaxonomySession(context);  
   //Get the default termstore for the site collection  
   var termStore =taxSession.getDefaultSiteCollectionTermStore();  
   //Get the term group just created by using GUID  
   var termGroup= termStore.getGroup(groupGuid);  
   //Create a termset with new GUID, 1033 is lcid for US English  
   var termSet= termGroup.createTermSet("Developers", termSetGuid, 1033);  
        context.load(termSet);  
      context.executeQueryAsync(function(){  
            alert("Term Set Created with Name : "+ termSet.get_name());  
      },function(sender,args){  
           alert(args.get_message());  
      });  
 }  
 function CreateTerms()  
 {  
   var context = SP.ClientContext.get_current();  
   //Get the taxonomy session object  
   var taxSession = SP.Taxonomy.TaxonomySession.getTaxonomySession(context);  
   //Get the default termstore for the site collection  
   var termStore =taxSession.getDefaultSiteCollectionTermStore();  
   //Get the term group just created by using GUID  
   var termGroup= termStore.getGroup(groupGuid);  
      //Get the termset by GUID  
      var termSet=termStore.getTermSet(termSetGuid);  
      //Create term with new GUID  
      var term1= termSet.createTerm("Developer", 1033, "1c88007a-b6f0-4175-b91b-ac02f95376d9");  
      var term2= termSet.createTerm("UI Developer", 1033, "676186d9-434e-4998-a050-18043ab66d08");  
       context.load(term1);  
       context.load(term2);  
      context.executeQueryAsync(function(){  
            alert("Term Created with Names : "+ term1.get_name()+ "," + term2.get_name());  
      },function(sender,args){  
           alert(args.get_message());  
      });  
 }  
 function ReadTerms()  
 {  
      var context = SP.ClientContext.get_current();  
      //Get the taxonomy session object  
   var taxSession = SP.Taxonomy.TaxonomySession.getTaxonomySession(context);  
   //Get the default termstore for the site collection  
   var termStore =taxSession.getDefaultSiteCollectionTermStore();  
   //Get the term group just created by using GUID  
   var termGroup= termStore.getGroup(groupGuid);  
      //Get the termset by GUID  
      var termSet=termStore.getTermSet(termSetGuid);  
      var terms= termSet.getAllTerms();  
      context.load(termGroup);  
      context.load(termSet);  
      context.load(terms);  
      context.executeQueryAsync(function(){  
            var result = "Group:"+ termGroup.get_name()+" \n";  
            result+= "Term Set:"+ termSet.get_name()+" \n";  
            var termEnumerator = terms.getEnumerator();  
            result+= "Terms: \n";  
                while(termEnumerator.moveNext()){  
                     var currentTerm = termEnumerator.get_current();  
                     result+= currentTerm.get_name() + "\n";  
                }   
       alert(result);  
      },function(sender,args){  
           alert(args.get_message());  
      });  
 }  

Below is the result snapshot of terms created.

I added a another post which shows you how to add item in list which contain metadata column using javascript object model.