Task: Find a new book recommendations

n8n workflow JSON:
{"id":"12","name":"Find a New Book","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[40,140],"parameters":{},"typeVersion":1},{"name":"Every Friday at 11:00 AM","type":"n8n-nodes-base.cron","position":[20,330],"parameters":{"triggerTimes":{"item":[{"hour":11,"mode":"everyWeek","weekday":"5"}]}},"typeVersion":1},{"name":"Set Subject","type":"n8n-nodes-base.set","position":[220,330],"parameters":{"values":{"string":[{"name":"subject","value":"juvenile_literature"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Retrieve Book Count","type":"n8n-nodes-base.httpRequest","position":[420,330],"parameters":{"url":"=http://openlibrary.org/subjects/{{$json[\"subject\"]}}.json","options":{},"queryParametersUi":{"parameter":[{"name":"limit","value":"0"}]}},"typeVersion":1},{"name":"Check Book Count","type":"n8n-nodes-base.if","position":[620,330],"parameters":{"conditions":{"number":[{"value1":"={{$node[\"Retrieve Book Count\"].json[\"work_count\"]}}","operation":"larger"}]}},"typeVersion":1},{"name":"Select Random Book","type":"n8n-nodes-base.function","position":[820,330],"parameters":{"functionCode":"var retrieve_book = 0;\nvar book_count = items[0].json.work_count;\n\nretrieve_book = Math.floor(Math.random() * book_count) + 1\n\nitems[0].json.retrieve_book = retrieve_book;\nreturn items;"},"typeVersion":1},{"name":"Retrieve Detailed Book Info","type":"n8n-nodes-base.httpRequest","position":[1260,330],"parameters":{"url":"=http://openlibrary.org.{{$node[\"Retrieve Basic Book Info\"].json[\"works\"][0][\"key\"]}}.json","options":{},"queryParametersUi":{"parameter":[{"name":"limit","value":"1"}]}},"typeVersion":1},{"name":"Retrieve Basic Book Info","type":"n8n-nodes-base.httpRequest","position":[1040,330],"parameters":{"url":"=http://openlibrary.org/subjects/{{$json[\"name\"]}}.json","options":{},"queryParametersUi":{"parameter":[{"name":"limit","value":"1"},{"name":"offset","value":"={{$json[\"retrieve_book\"]}}"},{"name":"detail","value":"true"}]}},"typeVersion":1},{"name":"Book Recommendation","type":"n8n-nodes-base.set","position":[1830,330],"parameters":{"values":{"string":[{"name":"msgSubject","value":"=Book Recommendation: {{$node[\"Create Author String\"].json[\"title\"]}}"},{"name":"msgBody","value":"=<H2><a href=\"{{$node[\"Create Author String\"].json[\"URL\"]}}\">{{$node[\"Create Author String\"].json[\"title\"]}}</a></H2>\n<p><em>By {{$node[\"Create Author String\"].json[\"authors\"]}}</em><br>\n{{$node[\"Create Author String\"].json[\"description\"]}}</p>"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Filtered Book Info","type":"n8n-nodes-base.set","position":[1460,330],"parameters":{"values":{"string":[{"name":"authors","value":"={{$node[\"Retrieve Basic Book Info\"].json[\"works\"][0][\"authors\"]}}"},{"name":"title","value":"={{$node[\"Retrieve Basic Book Info\"].json[\"works\"][0][\"title\"]}}"},{"name":"description","value":"={{$node[\"Retrieve Detailed Book Info\"].json[\"description\"][\"value\"]}}"},{"name":"URL","value":"=https://openlibrary.org{{$node[\"Retrieve Basic Book Info\"].json[\"works\"][0][\"key\"]}}"}]},"options":{},"keepOnlySet":true},"typeVersion":1},{"name":"Create Author String","type":"n8n-nodes-base.function","position":[1630,330],"parameters":{"functionCode":"var arrAuthors = items[0].json.authors;\n\nvar arrNames = arrAuthors.map(function(author) {\n  return \"<a href=\\\"https://openlibrary.org\" + author['key'] + \"\\\">\" + author['name'] + \"</a>\";\n});\n\nvar names = arrNames.join(\", \");\n\nitems[0].json.authors = names;\n\nreturn items;"},"typeVersion":1},{"name":"Send No Book Email","type":"n8n-nodes-base.emailSend","position":[830,520],"parameters":{"html":"=<p>Unfortunately, there are no books available for the subject of <em>{{$node[\"Check Book Count\"].json[\"name\"]}}</em>. Please update your n8n workflow with a different subject.</p>\n\n<p>A list of all available subjects can be found at <a href=\"https://openlibrary.org/subjects\">the Open Library</a>.</p>","options":{},"subject":"=Book not found in {{$node[\"Check Book Count\"].json[\"name\"]}}","toEmail":"john.doe@example.com","fromEmail":"john.doe@example.com"},"credentials":{"smtp":"Gmail Creds"},"typeVersion":1},{"name":"Send Book Email","type":"n8n-nodes-base.emailSend","position":[2030,330],"parameters":{"html":"={{$node[\"Book Recommendation\"].json[\"msgBody\"]}}","options":{},"subject":"={{$node[\"Book Recommendation\"].json[\"msgSubject\"]}}","toEmail":"john.doe@example.com","fromEmail":"john.doe@example.com"},"credentials":{"smtp":"Gmail Creds"},"typeVersion":1}],"active":false,"settings":{},"connections":{"Set Subject":{"main":[[{"node":"Retrieve Book Count","type":"main","index":0}]]},"Check Book Count":{"main":[[{"node":"Select Random Book","type":"main","index":0}],[{"node":"Send No Book Email","type":"main","index":0}]]},"Filtered Book Info":{"main":[[{"node":"Create Author String","type":"main","index":0}]]},"Select Random Book":{"main":[[{"node":"Retrieve Basic Book Info","type":"main","index":0}]]},"Book Recommendation":{"main":[[{"node":"Send Book Email","type":"main","index":0}]]},"Retrieve Book Count":{"main":[[{"node":"Check Book Count","type":"main","index":0}]]},"Create Author String":{"main":[[{"node":"Book Recommendation","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Set Subject","type":"main","index":0}]]},"Every Friday at 11:00 AM":{"main":[[{"node":"Set Subject","type":"main","index":0}]]},"Retrieve Basic Book Info":{"main":[[{"node":"Retrieve Detailed Book Info","type":"main","index":0}]]},"Retrieve Detailed Book Info":{"main":[[{"node":"Filtered Book Info","type":"main","index":0}]]}}}