How to get the type of a web part (with JavaScript)?

Question

I need to determine the type of a web part (eg. Script Editor, Search Results, etc.) on pages using JavaScript.

I started with REST and succeeded in getting the web part manager for a page and got the web part definitions (SP.WebParts.WebPartDefinition) as well. Unfortunately there is no type information, only Title, TitleUrl, ZoneIndex, Id etc. There is also no Properties property which I saw in some samples.

My request looks like this:

https://siteUrl/_api/web/getFileByServerRelativeUrl(fileUrl)/getLimitedWebPartManager(scope=1)/webparts?$expand=Webpart

I'm interested in SharePoint 2013 and 2016. I read about an ExportWebpart API which was introduced in 2016 for SP Online which seems to be missing at least on my on-prem test farm. If there are any means for on-prem I'd also like to know any patch level needed for the API to be available. But I could probably google this myself once I know the API.

So how do I get the type of a web part using JavaScript and REST (or JSOM - maybe there are more possibilities?) for SP on-prem?

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More information

When exporting the web part manually in the browser UI I get the information I need - in two places of the exported web part XML:

Metadata of the exported web part (This is what I'd like to have!):

<metaData>
  <type name="Microsoft.SharePoint.WebPartPages.ClientWebPart, Microsoft.SharePoint, Version=16.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c" />
  <importErrorMessage>Cannot import this Web Part.</importErrorMessage>
</metaData>

As an alternative (workaround) the properties would be (maybe) sufficient for my case as well. I could identify the web parts I'm interested in via their unique combination of properties like the FeatureId and others:

    <property name="FeatureId" type="System.Guid, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089">GUID I can use</property>

But I just cannot get these properties as well, using REST.

I checked that the export mode allows exporting the data:

That the web part properties are retrievable via Remote API:

I tried expanding WebPart.Properties instead of WebPart (like in some JSOM samples).

Nope. Maybe it's just not possible via REST? The documentation is no reason to party either.

Answer 1

I found a JS object called webpart properties... As alwas at JSON it's very "well" documented: https://msdn.microsoft.com/en-us/library/office/jj246541.aspx

Maybe the webpart type is hidden somewhere there... I haven't found it at the first glance, but here is the code, maybe a starting point:

var ctxOBJ = SP.ClientContext.get_current();
var webOBJ = ctxOBJ.get_web();
var siteOBJ = ctxOBJ.get_site();
var pageURL = window.location.pathname;
var webPartManagerOBJ = webOBJ.getFileByServerRelativeUrl(pageURL).getLimitedWebPartManager(SP.WebParts.PersonalizationScope.shared);
var webPartsOBJ = webPartManagerOBJ.get_webParts();
ctxOBJ.load(webPartsOBJ);
ctxOBJ.executeQueryAsync();

var webPartOBJ = webPartsOBJ.getById(0).get_webPart()
ctxOBJ.load(webPartOBJ);
ctxOBJ.executeQueryAsync(); 

var propsOBJ = webPartOBJ.get_properties()
ctxOBJ.load(propsOBJ);
ctxOBJ.executeQueryAsync();