API to read text content of SharePoint site page

VikasNeelam You can read the text content of site page using SharePoint REST API like: 

https://contoso.sharepoint.com/sites/work/_api/web/lists/getbytitle('Site Pages')/items(1)/FieldValuesAsText?$select=CanvasContent1

Where 1 in items(1) is the item ID of site page. CanvasContent1 property returns the content on site page.

You can also get the site page content as HTML using API: 

https://contoso.sharepoint.com/sites/work/_api/web/lists/getbytitle('Site Pages')/items(1)/FieldValuesAsHtml?$select=CanvasContent1

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