Updating a file using REST Api Visual Studio Team Services

Is there any way to update the contents of a file in a project on your visual studio team services account using HTTP verbs, similar to how it is done here with github https://developer.github.com/v3/repos/contents/#update-a-file.

 var json={
        "comment": "Update scripts.json",
        "changes": [{
            "changeType": 2,
            "item": {
                "path": "$/ExtensionsTest/scripts.json",
                "contentMetadata": { "encoding": 65001 },
                "version": 47
            },
            "newContent": {
                "content": "[ {\"hello\" : \"Test\"} ]",
                "contentType":"RawText"
            }
        }]
    };
   $.ajax({
        type: 'POST',
        url: 'https://xxxxx.visualstudio.com/_apis/tfvc/changesets?api-version=3.0-preview.2',
        contentType: 'application/json',
        data: JSON.stringify(json),
        cache: false,
        dataType: "json",
        beforeSend: function (xhr) {
                    xhr.setRequestHeader("Authorization", "Basic " +    btoa("my UserName" + ":" + "my PW"));
        }
    }).done(function (data) {
        console.log(data);
    });
};

The code above is what I am using and I get a 400 error with it. Any suggestions on what I am doing wrong.

Try these ways:

If you are using GIT:

1. Get commit ID value: Request method: GET; URL [collection url]/[team project name]/_apis/git/repositories/[repository name]/commits?api-version=1.0&branch=master&$top=1
2. Update file content: Request method: Post; URL: [collection url]/[team project name]/_apis/git/repositories/[repository name]/pushes?api-version=3.0-preview.2; Content Type: application/json;

JSON data:

{
    "refUpdates": [{
        "name": "refs/heads/master",
        "oldObjectId": "[step 1 commit ID]"
    }],
    "commits": [{
        "comment": "Updated BuildLog.cs",
        "changes": [{
            "changeType": 2,
            "item": {"path": "/BuildLog.cs"},
            "newContent": {
                "content": "using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    public class BuildLog
    {
        public int count;
        public string[] value6;
    }
}
",
                "contentType": 0
            }
        }]
    }]
}

If you are using TFVC:

1. Get changeset ID: Request method: GET; URL: [collection url]/_apis/tfvc/changesets?api-version=1.0&$top=1
2. Update file content: Request method: Post; URL: [collection url]/_apis/tfvc/changesets?api-version=3.0-preview.2; Content Type: application/json;

Json data:

{
    "comment": "Updated Class1.cs",
    "changes": [{
        "changeType": 2,
        "item": {
            "path": "$/Scrum2015/ClassLibraryB/ClassLibraryB/Class1.cs",
            "contentMetadata": {"encoding": 65001},
            "version": [step changeset id]
        },
        "newContent": {
            "content": "using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ClassLibraryB
{
    public class Class1
    {
        string sgs = \"\";
        public void T()
        {
            ClassLibraryA.Class1 c = new ClassLibraryA.Class1();
            c.TestOther2();
        }
    }
}
",
            "contentType": 0
        }
    }]
}

Note: You need to parse quotes if file content contains quotes (\”test\”), the same as other special charters.

On the other hand, you can achieve that through vso-node-api, more information, you can refer to this thread: TFS Rest API check-in to Version Control

Update1:

Refer to this code to modify your code:

  var json={
                    "comment": "Updated tt.json",
                    "changes": [{
                        "changeType": 2,
                        "item": {
                            "path": "$/Scrum2015/Buildtest/CoreSolutionDemo/WebApplication1/tt.json",
                            "contentMetadata": { "encoding": 65001 },
                            "version": 754
                        },
                        "newContent": {
                            "content": "[ {\"hello\" : \"Test2\"} ]",
                            "contentType": "RawText"
                        }
                    }]
                };
                $.ajax({
                    type: 'POST',
                    url: 'https://XXX.visualstudio.com/_apis/tfvc/changesets?api-version=3.0-preview.2',
                    contentType: 'application/json',
                    data: JSON.stringify(json),
                    cache: false,
                    dataType: 'json',
                    beforeSend: function (xhr) {
                        xhr.setRequestHeader("Authorization", "Basic " + btoa("name" + ":" + "password or PAT"));
                    },
                }).done(function (data) {
                    var s1 = "ss";

                }).error(function (e) {
                    var s = "ss";
                });
            })