diff --git a/docs/core_docs/src/theme/NotFound.js b/docs/core_docs/src/theme/NotFound.js
new file mode 100644
index 000000000000..3c9460a99f15
--- /dev/null
+++ b/docs/core_docs/src/theme/NotFound.js
@@ -0,0 +1,1041 @@
+/* eslint-disable import/no-extraneous-dependencies */
+/* eslint-disable no-nested-ternary */
+import React from "react";
+import { translate } from "@docusaurus/Translate";
+import { PageMetadata } from "@docusaurus/theme-common";
+import Layout from "@theme/Layout";
+
+import { useLocation } from "react-router-dom";
+
+function LegacyBadge() {
+  return <span className="badge badge--secondary">LEGACY</span>;
+}
+
+const suggestedLinks = {
+  "/docs/additional_resources/tutorials/expression_language_cheatsheet/": {
+    canonical: "/docs/how_to/lcel_cheatsheet/",
+    alternative: [
+      "/v0.1/docs/additional_resources/tutorials/expression_language_cheatsheet/",
+    ],
+  },
+  "/docs/ecosystem/": {
+    canonical: "/docs/integrations/platforms/",
+    alternative: ["/v0.1/docs/ecosystem/"],
+  },
+  "/docs/ecosystem/integrations/": {
+    canonical: "/docs/integrations/platforms/",
+    alternative: ["/v0.1/docs/ecosystem/integrations/"],
+  },
+  "/docs/ecosystem/integrations/databerry/": {
+    canonical: "/docs/integrations/platforms/",
+    alternative: ["/v0.1/docs/ecosystem/integrations/databerry/"],
+  },
+  "/docs/ecosystem/integrations/helicone/": {
+    canonical: "/docs/integrations/platforms/",
+    alternative: ["/v0.1/docs/ecosystem/integrations/helicone/"],
+  },
+  "/docs/ecosystem/integrations/lunary/": {
+    canonical: "/docs/integrations/platforms/",
+    alternative: ["/v0.1/docs/ecosystem/integrations/lunary/"],
+  },
+  "/docs/ecosystem/integrations/makersuite/": {
+    canonical: "/docs/integrations/platforms/",
+    alternative: ["/v0.1/docs/ecosystem/integrations/makersuite/"],
+  },
+  "/docs/ecosystem/integrations/unstructured/": {
+    canonical: "/docs/integrations/document_loaders/file_loaders/unstructured/",
+    alternative: ["/v0.1/docs/ecosystem/integrations/unstructured/"],
+  },
+  "/docs/ecosystem/langserve/": {
+    canonical:
+      "https://api.js.langchain.com/classes/_langchain_core.runnables_remote.RemoteRunnable.html",
+    alternative: ["/v0.1/docs/ecosystem/langserve/"],
+  },
+  "/docs/expression_language/": {
+    canonical: "/docs/how_to/#langchain-expression-language-lcel",
+    alternative: ["/v0.1/docs/expression_language/"],
+  },
+  "/docs/expression_language/cookbook/": {
+    canonical: "/docs/how_to/#langchain-expression-language-lcel",
+    alternative: ["/v0.1/docs/expression_language/cookbook/"],
+  },
+  "/docs/expression_language/cookbook/adding_memory/": {
+    canonical: "/docs/how_to/message_history",
+    alternative: ["/v0.1/docs/expression_language/cookbook/adding_memory/"],
+  },
+  "/docs/expression_language/cookbook/agents/": {
+    canonical: "/docs/how_to/agent_executor",
+    alternative: ["/v0.1/docs/expression_language/cookbook/agents/"],
+  },
+  "/docs/expression_language/cookbook/multiple_chains/": {
+    canonical: "/docs/how_to/parallel",
+    alternative: ["/v0.1/docs/expression_language/cookbook/multiple_chains/"],
+  },
+  "/docs/expression_language/cookbook/prompt_llm_parser/": {
+    canonical: "/docs/tutorials/llm_chain",
+    alternative: ["/v0.1/docs/expression_language/cookbook/prompt_llm_parser/"],
+  },
+  "/docs/expression_language/cookbook/retrieval/": {
+    canonical: "/docs/tutorials/rag",
+    alternative: ["/v0.1/docs/expression_language/cookbook/retrieval/"],
+  },
+  "/docs/expression_language/cookbook/sql_db/": {
+    canonical: "/docs/tutorials/sql_qa",
+    alternative: ["/v0.1/docs/expression_language/cookbook/sql_db/"],
+  },
+  "/docs/expression_language/cookbook/tools/": {
+    canonical: "/docs/how_to/tool_calling/",
+    alternative: ["/v0.1/docs/expression_language/cookbook/tools/"],
+  },
+  "/docs/expression_language/get_started/": {
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+    alternative: ["/v0.1/docs/expression_language/get_started/"],
+  },
+  "/docs/expression_language/how_to/map/": {
+    canonical: "/docs/how_to/cancel_execution/",
+    alternative: ["/v0.1/docs/expression_language/how_to/map/"],
+  },
+  "/docs/expression_language/how_to/message_history/": {
+    canonical: "/docs/how_to/message_history",
+    alternative: ["/v0.1/docs/expression_language/how_to/message_history/"],
+  },
+  "/docs/expression_language/how_to/routing/": {
+    canonical: "/docs/how_to/routing",
+    alternative: ["/v0.1/docs/expression_language/how_to/routing/"],
+  },
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+    canonical: "/docs/how_to/message_history",
+    alternative: ["/v0.1/docs/expression_language/how_to/with_history/"],
+  },
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+    alternative: ["/v0.1/docs/expression_language/interface/"],
+  },
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+    canonical: "/docs/how_to/streaming",
+    alternative: ["/v0.1/docs/expression_language/streaming/"],
+  },
+  "/docs/expression_language/why/": {
+    canonical: "/docs/concepts/#langchain-expression-language-lcel",
+    alternative: ["/v0.1/docs/expression_language/why/"],
+  },
+  "/docs/get_started/": {
+    canonical: "/docs/introduction/",
+    alternative: ["/v0.1/docs/get_started/"],
+  },
+  "/docs/get_started/installation/": {
+    canonical: "/docs/tutorials/",
+    alternative: ["/v0.1/docs/get_started/installation/"],
+  },
+  "/docs/get_started/introduction/": {
+    canonical: "/docs/tutorials/",
+    alternative: ["/v0.1/docs/get_started/introduction/"],
+  },
+  "/docs/get_started/quickstart/": {
+    canonical: "/docs/tutorials/",
+    alternative: ["/v0.1/docs/get_started/quickstart/"],
+  },
+  "/docs/guides/": {
+    canonical: "/docs/how_to/",
+    alternative: ["/v0.1/docs/guides/"],
+  },
+  "/docs/guides/debugging/": {
+    canonical: "/docs/how_to/debugging",
+    alternative: ["/v0.1/docs/guides/debugging/"],
+  },
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+    alternative: ["/v0.1/docs/guides/deployment/"],
+  },
+  "/docs/guides/deployment/nextjs/": {
+    canonical: "https://github.com/langchain-ai/langchain-nextjs-template",
+    alternative: ["/v0.1/docs/guides/deployment/nextjs/"],
+  },
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+    canonical: "https://github.com/langchain-ai/langchain-nextjs-template",
+    alternative: ["/v0.1/docs/guides/deployment/sveltekit/"],
+  },
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+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: ["/v0.1/docs/guides/evaluation/"],
+  },
+  "/docs/guides/evaluation/comparison/": {
+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: ["/v0.1/docs/guides/evaluation/comparison/"],
+  },
+  "/docs/guides/evaluation/comparison/pairwise_embedding_distance/": {
+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: [
+      "/v0.1/docs/guides/evaluation/comparison/pairwise_embedding_distance/",
+    ],
+  },
+  "/docs/guides/evaluation/comparison/pairwise_string/": {
+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: ["/v0.1/docs/guides/evaluation/comparison/pairwise_string/"],
+  },
+  "/docs/guides/evaluation/examples/": {
+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: ["/v0.1/docs/guides/evaluation/examples/"],
+  },
+  "/docs/guides/evaluation/examples/comparisons/": {
+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: ["/v0.1/docs/guides/evaluation/examples/comparisons/"],
+  },
+  "/docs/guides/evaluation/string/": {
+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: ["/v0.1/docs/guides/evaluation/string/"],
+  },
+  "/docs/guides/evaluation/string/criteria/": {
+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: ["/v0.1/docs/guides/evaluation/string/criteria/"],
+  },
+  "/docs/guides/evaluation/string/embedding_distance/": {
+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: ["/v0.1/docs/guides/evaluation/string/embedding_distance/"],
+  },
+  "/docs/guides/evaluation/trajectory/": {
+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: ["/v0.1/docs/guides/evaluation/trajectory/"],
+  },
+  "/docs/guides/evaluation/trajectory/trajectory_eval/": {
+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: ["/v0.1/docs/guides/evaluation/trajectory/trajectory_eval/"],
+  },
+  "/docs/guides/extending_langchain/": {
+    canonical: "/docs/how_to/#custom",
+    alternative: ["/v0.1/docs/guides/extending_langchain/"],
+  },
+  "/docs/guides/fallbacks/": {
+    canonical: "/docs/how_to/fallbacks",
+    alternative: ["/v0.1/docs/guides/fallbacks/"],
+  },
+  "/docs/guides/langsmith_evaluation/": {
+    canonical:
+      "https://docs.smith.langchain.com/tutorials/Developers/evaluation",
+    alternative: ["/v0.1/docs/guides/langsmith_evaluation/"],
+  },
+  "/docs/guides/migrating/": {
+    canonical: "https://js.langchain.com/v0.1/docs/guides/migrating/",
+    alternative: ["/v0.1/docs/guides/migrating/"],
+  },
+  "/docs/integrations/chat_memory/": {
+    canonical: "/docs/integrations/memory",
+    alternative: ["/v0.1/docs/integrations/chat_memory/"],
+  },
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+    canonical: "/docs/integrations/memory/astradb",
+    alternative: ["/v0.1/docs/integrations/chat_memory/astradb/"],
+  },
+  "/docs/integrations/chat_memory/cassandra/": {
+    canonical: "/docs/integrations/memory/cassandra",
+    alternative: ["/v0.1/docs/integrations/chat_memory/cassandra/"],
+  },
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+    canonical: "/docs/integrations/memory/cloudflare_d1",
+    alternative: ["/v0.1/docs/integrations/chat_memory/cloudflare_d1/"],
+  },
+  "/docs/integrations/chat_memory/convex/": {
+    canonical: "/docs/integrations/memory/convex",
+    alternative: ["/v0.1/docs/integrations/chat_memory/convex/"],
+  },
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+    canonical: "/docs/integrations/memory/dynamodb",
+    alternative: ["/v0.1/docs/integrations/chat_memory/dynamodb/"],
+  },
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+    canonical: "/docs/integrations/memory/firestore",
+    alternative: ["/v0.1/docs/integrations/chat_memory/firestore/"],
+  },
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+    canonical: "/docs/integrations/memory/ipfs_datastore",
+    alternative: ["/v0.1/docs/integrations/chat_memory/ipfs_datastore/"],
+  },
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+    canonical: "/docs/integrations/memory/momento",
+    alternative: ["/v0.1/docs/integrations/chat_memory/momento/"],
+  },
+  "/docs/integrations/chat_memory/mongodb/": {
+    canonical: "/docs/integrations/memory/mongodb",
+    alternative: ["/v0.1/docs/integrations/chat_memory/mongodb/"],
+  },
+  "/docs/integrations/chat_memory/motorhead_memory/": {
+    canonical: "/docs/integrations/memory/motorhead_memory",
+    alternative: ["/v0.1/docs/integrations/chat_memory/motorhead_memory/"],
+  },
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+    canonical: "/docs/integrations/memory/planetscale",
+    alternative: ["/v0.1/docs/integrations/chat_memory/planetscale/"],
+  },
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+    canonical: "/docs/integrations/memory/postgres",
+    alternative: ["/v0.1/docs/integrations/chat_memory/postgres/"],
+  },
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+    canonical: "/docs/integrations/memory/redis",
+    alternative: ["/v0.1/docs/integrations/chat_memory/redis/"],
+  },
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+    canonical: "/docs/integrations/memory/upstash_redis",
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+  },
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+  },
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+  },
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+    alternative: ["/v0.1/docs/integrations/llms/togetherai/"],
+  },
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+  },
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+  },
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+    alternative: [
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+    ],
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+  },
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+    alternative: [
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+    ],
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+    canonical: "/docs/how_to/migrate_agent",
+    alternative: ["/v0.1/docs/modules/agents/agent_types/openai_tools_agent/"],
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+    canonical:
+      "https://js.langchain.com/v0.1/docs/use_cases/autonomous_agents/sales_gpt/",
+    alternative: ["/v0.1/docs/use_cases/autonomous_agents/sales_gpt/"],
+  },
+  "/docs/use_cases/graph/construction/": {
+    canonical: "/docs/tutorials/graph",
+    alternative: ["/v0.1/docs/use_cases/graph/construction/"],
+  },
+  "/docs/use_cases/media/": {
+    canonical: "/docs/how_to/multimodal_prompts",
+    alternative: ["/v0.1/docs/use_cases/media/"],
+  },
+  "/docs/use_cases/query_analysis/how_to/constructing_filters/": {
+    canonical: "/docs/tutorials/query_analysis",
+    alternative: [
+      "/v0.1/docs/use_cases/query_analysis/how_to/constructing_filters/",
+    ],
+  },
+  "/docs/use_cases/tabular/": {
+    canonical: "/docs/tutorials/sql_qa",
+    alternative: ["/v0.1/docs/use_cases/tabular/"],
+  },
+};
+
+export default function NotFound() {
+  const location = useLocation();
+  const pathname = location.pathname.endsWith("/")
+    ? location.pathname
+    : `${location.pathname}/`; // Ensure the path matches the keys in suggestedLinks
+  const { canonical, alternative } = suggestedLinks[pathname] || {};
+
+  return (
+    <>
+      <PageMetadata
+        title={translate({
+          id: "theme.NotFound.title",
+          message: "Page Not Found",
+        })}
+      />
+      <Layout>
+        <main className="container margin-vert--xl">
+          <div className="row">
+            <div className="col col--6 col--offset-3">
+              <h1 className="hero__title">
+                {canonical
+                  ? "Page Moved"
+                  : alternative
+                  ? "Page Removed"
+                  : "Page Not Found"}
+              </h1>
+              {canonical ? (
+                <h3>
+                  You can find the new location <a href={canonical}>here</a>.
+                </h3>
+              ) : alternative ? (
+                <p>The page you were looking for has been removed.</p>
+              ) : (
+                <p>We could not find what you were looking for.</p>
+              )}
+              {alternative && (
+                <p>
+                  <details>
+                    <summary>Alternative pages</summary>
+                    <ul>
+                      {alternative.map((alt, index) => (
+                        // eslint-disable-next-line react/no-array-index-key
+                        <li key={index}>
+                          <a href={alt}>{alt}</a>
+                          {alt.startsWith("/v0.1/") && (
+                            <>
+                              {" "}
+                              <LegacyBadge />
+                            </>
+                          )}
+                        </li>
+                      ))}
+                    </ul>
+                  </details>
+                </p>
+              )}
+              <p>
+                Please contact the owner of the site that linked you to the
+                original URL and let them know their link{" "}
+                {canonical
+                  ? "has moved."
+                  : alternative
+                  ? "has been removed."
+                  : "is broken."}
+              </p>
+            </div>
+          </div>
+        </main>
+      </Layout>
+    </>
+  );
+}