Crawl Google Keep entries, concatenate them all, and print to the console. Right click on the console entry to save as a single file.

google-keep.js

/*
Inspect your google keep items and find the appropriate container selector, and those for the title and item body divs.
*/

var items=document.querySelectorAll('.IZ65Hb-n0tgWb.IZ65Hb-WsjYwc-nUpftc.RNfche');
var out = '';
for(var i = 0; i < items.length; i++) {
	var item = items[i];
	var text = item.querySelector('.IZ65Hb-YPqjbf.r4nke-YPqjbf[contenteditable="false"]');
	if(text && text.innerText.length > 0) {
		out += text.innerText + "\n\n";
	}
	text = item.querySelector('.IZ65Hb-YPqjbf.h1U9Be-YPqjbf[contenteditable="false"]');
	if (text) {
		out += text.innerText + "\n\n----\n\n";
	}
}
console.log(out);