diff --git a/build/release.js b/build/release.js
index d74cfebc..91086f48 100644
--- a/build/release.js
+++ b/build/release.js
@@ -13,10 +13,9 @@
  */
 /** @typedef {import('../build/utils').IFile} IFile */
 
-const glob = require('glob');
 const path = require('path');
 const fs = require('fs');
-const { REPO_ROOT, removeDir, ensureDir, readFiles, writeFiles } = require('../build/utils');
+const { REPO_ROOT, removeDir, readFiles, writeFiles } = require('../build/utils');
 const ts = require('typescript');
 /**@type { IMetadata } */
 const metadata = require('../metadata.js');
diff --git a/build/website.js b/build/website.js
index d8ffbc08..9385462f 100644
--- a/build/website.js
+++ b/build/website.js
@@ -7,6 +7,7 @@
 
 /** @typedef {import('../build/utils').IFile} IFile */
 
+const glob = require('glob');
 const path = require('path');
 const fs = require('fs');
 const cp = require('child_process');
@@ -26,9 +27,51 @@ const MONACO_EDITOR_VERSION = (() => {
 })();
 
 removeDir(`../monaco-editor-website`);
-
+checkSamples();
 generateWebsite();
 
+/**
+ * Check that there are samples for all available languages
+ */
+function checkSamples() {
+	let languages = glob
+		.sync('src/basic-languages/*/*.contribution.ts', { cwd: REPO_ROOT })
+		.map((f) => path.dirname(f))
+		.map((f) => f.substring('src/basic-languages/'.length));
+	languages.push('css');
+	languages.push('html');
+	languages.push('json');
+	languages.push('typescript');
+
+	// some languages have a different id than their folder
+	languages = languages.map((l) => {
+		switch (l) {
+			case 'coffee':
+				return 'coffeescript';
+			case 'protobuf':
+				return 'proto';
+			case 'solidity':
+				return 'sol';
+			case 'sophia':
+				return 'aes';
+			default:
+				return l;
+		}
+	});
+
+	let fail = false;
+	for (const language of languages) {
+		const expectedSamplePath = path.join(REPO_ROOT, `website/index/samples/sample.${language}.txt`);
+		if (!fs.existsSync(expectedSamplePath)) {
+			console.error(`Missing sample for ${language} at ${expectedSamplePath}`);
+			fail = true;
+		}
+	}
+	if (fail) {
+		process.exit(1);
+	}
+}
+
 /**
  * @param {string} dataPath
  * @param {string} contents
diff --git a/website/index/samples/sample.ecl.txt b/website/index/samples/sample.ecl.txt
new file mode 100644
index 00000000..5c7c8caa
--- /dev/null
+++ b/website/index/samples/sample.ecl.txt
@@ -0,0 +1,7 @@
+F0 := IMDB.File_actors;
+CountActors := RECORD
+F0.ActorName;
+UNSIGNED C := COUNT(GROUP);
+END;
+MoviesIn := TABLE(F0,CountActors,ActorName);
+OUTPUT(TOPN(MoviesIn,100,-C));
diff --git a/website/index/samples/sample.flow9.txt b/website/index/samples/sample.flow9.txt
new file mode 100644
index 00000000..6947a629
--- /dev/null
+++ b/website/index/samples/sample.flow9.txt
@@ -0,0 +1,14 @@
+import material/material;
+
+export {
+	demoMakeHelloWorld(onClose : () -> void) -> Material;
+}
+
+demoMakeHelloWorld(onClose : () -> void) -> Material {
+	MCenter(
+		MLines2(
+			MText("Hello, world!", []),
+			MTextButton("CLOSE", onClose, [], [])
+		)
+	);
+}
diff --git a/website/index/samples/sample.lexon.txt b/website/index/samples/sample.lexon.txt
new file mode 100644
index 00000000..cbce2643
--- /dev/null
+++ b/website/index/samples/sample.lexon.txt
@@ -0,0 +1,17 @@
+LEX Paid Escrow.
+LEXON: 0.2.12
+COMMENT: 3.f - an escrow that is controlled by a third party for a fee.
+“Payer” is a person.
+“Payee” is a person.
+“Arbiter” is a person.
+“Fee” is an amount.
+The Payer pays an Amount into escrow,
+appoints the Payee,
+appoints the Arbiter,
+and also fixes the Fee.
+CLAUSE: Pay Out.
+The Arbiter may pay from escrow the Fee to themselves,
+and afterwards pay the remainder of the escrow to the Payee.
+CLAUSE: Pay Back.
+The Arbiter may pay from escrow the Fee to themselves,
+and afterwards return the remainder of the escrow to the Payer.
diff --git a/website/index/samples/sample.liquid.txt b/website/index/samples/sample.liquid.txt
new file mode 100644
index 00000000..dccd7fed
--- /dev/null
+++ b/website/index/samples/sample.liquid.txt
@@ -0,0 +1,16 @@
+class Random < Liquid::Block
+  def initialize(tag_name, markup, tokens)
+     super
+     @rand = markup.to_i
+  end
+
+  def render(context)
+    value = rand(@rand)
+    super.sub('^^^', value.to_s)  # calling `super` returns the content of the block
+  end
+end
+
+Liquid::Template.register_tag('random', Random)
+text = " {% random 5 %} you have drawn number ^^^, lucky you! {% endrandom %} "
+@template = Liquid::Template.parse(text)
+@template.render  # will return "you have drawn number 1, lucky you!" in 20% of cases
diff --git a/website/index/samples/sample.m3.txt b/website/index/samples/sample.m3.txt
new file mode 100644
index 00000000..8f893851
--- /dev/null
+++ b/website/index/samples/sample.m3.txt
@@ -0,0 +1,5 @@
+ MODULE HelloWorld EXPORTS Main;
+ FROM IO IMPORT Put;
+ BEGIN
+   Put("Hello World\n")
+ END HelloWorld.
diff --git a/website/index/samples/sample.pla.txt b/website/index/samples/sample.pla.txt
new file mode 100644
index 00000000..0209a023
--- /dev/null
+++ b/website/index/samples/sample.pla.txt
@@ -0,0 +1,4 @@
+.ob out1 out2 out3
+--1--     -        wait     110000
+.ilb in1 in0 wait ack nack
+.symbolic state<3> state<2>;aaa bbb; # comment
diff --git a/website/index/samples/sample.proto.txt b/website/index/samples/sample.proto.txt
new file mode 100644
index 00000000..409364a0
--- /dev/null
+++ b/website/index/samples/sample.proto.txt
@@ -0,0 +1,11 @@
+syntax = "proto3";
+import public "other.proto";
+
+/* SearchRequest represents a search query, with pagination options to
+ * indicate which results to include in the response. */
+
+message SearchRequest {
+  required string query = 1;
+  optional int32 page_number = 2;  // Which page number do we want?
+  optional int32 result_per_page = 3;  // Number of results to return per page.
+}
diff --git a/website/index/samples/sample.qsharp.txt b/website/index/samples/sample.qsharp.txt
new file mode 100644
index 00000000..5106fb4f
--- /dev/null
+++ b/website/index/samples/sample.qsharp.txt
@@ -0,0 +1,45 @@
+// Run this cell using Ctrl+Enter (⌘+Enter on Mac)
+// Then run the next cell to see the output
+
+open Microsoft.Quantum.Diagnostics;
+
+operation QubitsDemo () : Unit {
+    // This line allocates a qubit in state |0⟩
+    use q = Qubit();
+    Message("State |0⟩:");
+
+    // This line prints out the state of the quantum computer
+    // Since only one qubit is allocated, only its state is printed
+    DumpMachine();
+
+    // This line changes the qubit from state |0⟩ to state |1⟩
+    X(q);
+
+    Message("State |1⟩:");
+    DumpMachine();
+
+    // This line changes the qubit to state |-⟩ = (1/sqrt(2))(|0⟩ - |1⟩)
+    // That is, this puts the qubit into a superposition
+    // 1/sqrt(2) is approximately 0.707107
+    H(q);
+
+    Message("State |-⟩:");
+    DumpMachine();
+
+    // This line changes the qubit to state |-i⟩ = (1/sqrt(2))(|0⟩ - i|1⟩)
+    S(q);
+
+    Message("State |-i⟩:");
+    DumpMachine();
+
+    // This will put the qubit into an uneven superposition,
+    // where the amplitudes of |0⟩ and |1⟩ have different moduli
+    Rx(2.0, q);
+    Ry(1.0, q);
+
+    Message("Uneven superposition state:");
+    DumpMachine();
+
+    // This line returns the qubit to state |0⟩
+    Reset(q);
+}
diff --git a/website/index/samples/sample.sparql.txt b/website/index/samples/sample.sparql.txt
new file mode 100644
index 00000000..35ac602c
--- /dev/null
+++ b/website/index/samples/sample.sparql.txt
@@ -0,0 +1,7 @@
+  SELECT ?x ?name
+  {
+    ?x  foaf:mbox <mailto:alice@example> .
+    ?x  foaf:knows ?a1 .
+    ?a1 foaf:knows ?a2 .
+    ?a2 foaf:name ?name .
+  }