diff --git a/bin/ci-test.sh b/bin/ci-test.sh
index c6687f8c..4627b86c 100755
--- a/bin/ci-test.sh
+++ b/bin/ci-test.sh
@@ -5,7 +5,7 @@ NODE_MAJOR_VERSION=$(node -v | cut -d'.' -f1 | sed 's/v//')
 # Some projects require type stripping (Node >= 22); skip them altogether.
 # TODO: Remove this in May 2026 when Node 20 goes EOL.
 if [ "$NODE_MAJOR_VERSION" -lt 22 ]; then
-  FILTER="--filter=!@ohm-js/compiler --filter=!@ohm-js/semantics --filter=!@ohm-js/lang-python --filter=!labrat"
+  FILTER="--filter=!@ohm-js/compiler --filter=!@ohm-js/semantics --filter=!@ohm-js/lang-python --filter=!@ohm-js/lang-json --filter=!labrat"
 else
   FILTER=""
 fi
diff --git a/packages/lang-json/bench.ts b/packages/lang-json/bench.ts
new file mode 100644
index 00000000..4d5218c9
--- /dev/null
+++ b/packages/lang-json/bench.ts
@@ -0,0 +1,71 @@
+import {readFileSync} from 'node:fs';
+import path from 'node:path';
+import process from 'node:process';
+import {fileURLToPath} from 'node:url';
+
+import {Bench} from 'tinybench';
+import {grammar} from '@ohm-js/compiler/compat';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+
+const ohmSource = readFileSync(path.join(__dirname, 'json.ohm'), 'utf-8');
+const json = grammar(ohmSource);
+
+// The benchmark file assigns a JSON string to `self.sample`.
+// Evaluate it to extract the actual JSON.
+const jsSource = readFileSync(path.join(__dirname, 'test/data/1K_json.js'), 'utf-8');
+const self: Record<string, string> = {};
+new Function('self', jsSource)(self);
+const input = self.sample;
+
+// Sanity check: verify JSON.parse and our grammar both accept it.
+JSON.parse(input);
+json.match(input).use(r => {
+  if (!r.succeeded()) throw new Error('Match failed');
+});
+console.error(`Input: 1K_json.js (${(input.length / 1024).toFixed(0)}KB)`);
+
+const smallSize = process.argv.includes('--small-size');
+const iterations = smallSize ? 1 : 10;
+
+const bench = new Bench({
+  iterations,
+  time: 0,
+  warmup: true,
+});
+
+const opts = {
+  afterEach() {
+    process.stderr.write('.');
+  },
+};
+
+bench.add(
+  'ohm (wasm)',
+  () => {
+    json.match(input).use(r => r.succeeded());
+  },
+  opts
+);
+
+bench.add(
+  'JSON.parse',
+  () => {
+    JSON.parse(input);
+  },
+  opts
+);
+
+(async () => {
+  await bench.run();
+  process.stderr.write('\n');
+
+  for (const task of bench.tasks) {
+    const {state} = task.result;
+    if (state !== 'completed') continue;
+    const {mean, sd, samplesCount} = task.result.latency;
+    console.error(
+      `${task.name}: ${mean.toFixed(2)}ms ± ${sd.toFixed(2)}ms (n=${samplesCount})`
+    );
+  }
+})();
diff --git a/packages/lang-json/package.json b/packages/lang-json/package.json
index af189c37..77379a44 100644
--- a/packages/lang-json/package.json
+++ b/packages/lang-json/package.json
@@ -1,4 +1,18 @@
 {
   "name": "@ohm-js/lang-json",
-  "private": true
+  "version": "1.0.0",
+  "private": true,
+  "description": "A JSON grammar for Ohm",
+  "type": "module",
+  "scripts": {
+    "test": "node --test test/test-json.ts && node bench.ts --small-size"
+  },
+  "dependencies": {
+    "@ohm-js/compiler": "workspace:*",
+    "ohm-js": "workspace:*"
+  },
+  "devDependencies": {
+    "tinybench": "^6.0.0"
+  },
+  "license": "MIT"
 }
diff --git a/packages/lang-json/test/data/1K_json.js b/packages/lang-json/test/data/1K_json.js
new file mode 100644
index 00000000..b7f1b140
--- /dev/null
+++ b/packages/lang-json/test/data/1K_json.js
@@ -0,0 +1,994 @@
+// From https://github.com/Chevrotain/chevrotain/blob/gh-pages/performance/samples/1K_json.js
+self.sample =
+  "[\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e5688f478d31e213cb",\r\n' +
+  '    "index": 0,\r\n' +
+  '    "guid": "a601b360-938e-4326-8bd1-d78fd8c3d54b",\r\n' +
+  '    "isActive": false,\r\n' +
+  '    "balance": "$1,867.26",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 40,\r\n' +
+  '    "eyeColor": "brown",\r\n' +
+  '    "name": "Gomez Rocha",\r\n' +
+  '    "gender": "male",\r\n' +
+  '    "company": "VERBUS",\r\n' +
+  '    "email": "gomezrocha@verbus.com",\r\n' +
+  '    "phone": "+1 (914) 572-3986",\r\n' +
+  '    "address": "646 Blake Court, Cherokee, Colorado, 9616",\r\n' +
+  '    "about": "In ipsum quis veniam consectetur commodo reprehenderit laboris pariatur fugiat culpa officia tempor excepteur do. Est duis elit deserunt ipsum consequat anim. Nulla adipisicing est labore labore incididunt exercitation proident enim eu voluptate laboris. Fugiat consequat occaecat est ut laborum culpa esse adipisicing Lorem incididunt fugiat aliqua labore ex.\\r\\n",\r\n' +
+  '    "registered": "2015-01-16T05:01:25 -02:00",\r\n' +
+  '    "latitude": 60.377082,\r\n' +
+  '    "longitude": -50.078349,\r\n' +
+  '    "tags": [\r\n' +
+  '      "elit",\r\n' +
+  '      "sint",\r\n' +
+  '      "ea",\r\n' +
+  '      "enim",\r\n' +
+  '      "nulla",\r\n' +
+  '      "consectetur",\r\n' +
+  '      "minim"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Rebekah Roy"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Callahan Barrera"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Cantu Fitzpatrick"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Gomez Rocha! You have 3 unread messages.",\r\n' +
+  '    "favoriteFruit": "apple"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e561c8bf01ed63c46a",\r\n' +
+  '    "index": 1,\r\n' +
+  '    "guid": "ebce58f2-e1f7-4dfc-bb84-b3bc2ebb799a",\r\n' +
+  '    "isActive": true,\r\n' +
+  '    "balance": "$1,062.96",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 38,\r\n' +
+  '    "eyeColor": "brown",\r\n' +
+  '    "name": "Meagan Rutledge",\r\n' +
+  '    "gender": "female",\r\n' +
+  '    "company": "TWIGGERY",\r\n' +
+  '    "email": "meaganrutledge@twiggery.com",\r\n' +
+  '    "phone": "+1 (911) 471-3885",\r\n' +
+  '    "address": "153 Church Lane, Avoca, Idaho, 7052",\r\n' +
+  '    "about": "Exercitation dolore nisi nostrud quis do quis minim voluptate dolore ea eu esse. Ad velit in id velit nisi cillum commodo voluptate ut. Reprehenderit sit aute non aliqua ullamco fugiat laborum et est voluptate cillum Lorem reprehenderit. Occaecat id magna deserunt et non qui ea aliqua cupidatat ad. Reprehenderit occaecat elit et ullamco. Dolore id qui ullamco qui consectetur elit duis ipsum enim ex. Quis veniam ad ex elit duis deserunt voluptate consectetur eu tempor cupidatat nulla sit enim.\\r\\n",\r\n' +
+  '    "registered": "2014-02-08T01:47:09 -02:00",\r\n' +
+  '    "latitude": -65.072152,\r\n' +
+  '    "longitude": 79.350832,\r\n' +
+  '    "tags": [\r\n' +
+  '      "labore",\r\n' +
+  '      "et",\r\n' +
+  '      "culpa",\r\n' +
+  '      "minim",\r\n' +
+  '      "elit",\r\n' +
+  '      "enim",\r\n' +
+  '      "Lorem"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Macdonald Mckee"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Georgia Reynolds"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Puckett Mcfarland"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Meagan Rutledge! You have 7 unread messages.",\r\n' +
+  '    "favoriteFruit": "banana"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e53330326090a4a657",\r\n' +
+  '    "index": 2,\r\n' +
+  '    "guid": "7aa6f784-f1aa-497b-a8a5-10353413e37e",\r\n' +
+  '    "isActive": true,\r\n' +
+  '    "balance": "$2,026.11",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 30,\r\n' +
+  '    "eyeColor": "brown",\r\n' +
+  '    "name": "Bradshaw Reilly",\r\n' +
+  '    "gender": "male",\r\n' +
+  '    "company": "GINKLE",\r\n' +
+  '    "email": "bradshawreilly@ginkle.com",\r\n' +
+  '    "phone": "+1 (898) 512-2689",\r\n' +
+  '    "address": "204 Losee Terrace, Gasquet, Utah, 8110",\r\n' +
+  '    "about": "Sit ullamco voluptate deserunt dolor mollit commodo fugiat reprehenderit fugiat dolor Lorem adipisicing laboris. Dolor ipsum id nostrud non. Sunt laboris mollit do ea mollit et. Minim aute aute cillum sit ex ad nostrud commodo. Irure ut nisi in et dolore quis. Duis magna quis voluptate irure incididunt nostrud.\\r\\n",\r\n' +
+  '    "registered": "2014-08-07T11:44:47 -03:00",\r\n' +
+  '    "latitude": -15.523501,\r\n' +
+  '    "longitude": 1.30236,\r\n' +
+  '    "tags": [\r\n' +
+  '      "Lorem",\r\n' +
+  '      "eu",\r\n' +
+  '      "occaecat",\r\n' +
+  '      "duis",\r\n' +
+  '      "ut",\r\n' +
+  '      "veniam",\r\n' +
+  '      "cillum"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Sarah Ratliff"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Lacy Key"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Lara Atkinson"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Bradshaw Reilly! You have 3 unread messages.",\r\n' +
+  '    "favoriteFruit": "apple"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e51e19a7f92b432464",\r\n' +
+  '    "index": 3,\r\n' +
+  '    "guid": "bb84ad96-7388-4510-b89c-a683f141f985",\r\n' +
+  '    "isActive": false,\r\n' +
+  '    "balance": "$3,791.84",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 24,\r\n' +
+  '    "eyeColor": "brown",\r\n' +
+  '    "name": "Araceli Cole",\r\n' +
+  '    "gender": "female",\r\n' +
+  '    "company": "JETSILK",\r\n' +
+  '    "email": "aracelicole@jetsilk.com",\r\n' +
+  '    "phone": "+1 (864) 509-2264",\r\n' +
+  '    "address": "184 Pierrepont Place, Beaverdale, Wisconsin, 5683",\r\n' +
+  '    "about": "Quis labore proident deserunt dolor enim. Irure est veniam deserunt est ullamco fugiat et tempor fugiat minim ipsum minim elit deserunt. Est adipisicing minim amet sunt ad tempor nulla elit eu. Dolor proident amet qui voluptate voluptate veniam enim elit excepteur excepteur minim.\\r\\n",\r\n' +
+  '    "registered": "2015-07-14T12:43:19 -03:00",\r\n' +
+  '    "latitude": 32.53047,\r\n' +
+  '    "longitude": -109.994191,\r\n' +
+  '    "tags": [\r\n' +
+  '      "esse",\r\n' +
+  '      "enim",\r\n' +
+  '      "incididunt",\r\n' +
+  '      "dolor",\r\n' +
+  '      "anim",\r\n' +
+  '      "ipsum",\r\n' +
+  '      "deserunt"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Blanche Ortiz"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Carney Shaw"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Ethel Weeks"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Araceli Cole! You have 6 unread messages.",\r\n' +
+  '    "favoriteFruit": "strawberry"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e53abf914c434918f9",\r\n' +
+  '    "index": 4,\r\n' +
+  '    "guid": "3a9e01a2-8b49-4658-a075-d0a9d1fc1a56",\r\n' +
+  '    "isActive": false,\r\n' +
+  '    "balance": "$3,327.44",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 33,\r\n' +
+  '    "eyeColor": "brown",\r\n' +
+  '    "name": "Kaye Casey",\r\n' +
+  '    "gender": "female",\r\n' +
+  '    "company": "ZAGGLES",\r\n' +
+  '    "email": "kayecasey@zaggles.com",\r\n' +
+  '    "phone": "+1 (877) 533-3531",\r\n' +
+  '    "address": "555 Cranberry Street, Guthrie, Delaware, 7792",\r\n' +
+  '    "about": "Eu sunt dolor amet mollit enim exercitation amet laborum magna incididunt. Ex et quis fugiat ipsum. Incididunt elit sunt anim eu fugiat nostrud voluptate ea fugiat ea. Enim labore magna qui proident culpa occaecat ullamco adipisicing incididunt sunt nisi adipisicing consectetur aute. Ullamco reprehenderit do occaecat ut laborum excepteur cupidatat pariatur ut non non et exercitation. Nulla dolor voluptate aliquip mollit proident id ullamco aliqua exercitation eiusmod. Laboris ullamco veniam ullamco veniam reprehenderit labore nostrud enim reprehenderit fugiat adipisicing cupidatat.\\r\\n",\r\n' +
+  '    "registered": "2016-02-29T05:37:25 -02:00",\r\n' +
+  '    "latitude": -82.825057,\r\n' +
+  '    "longitude": -19.579575,\r\n' +
+  '    "tags": [\r\n' +
+  '      "qui",\r\n' +
+  '      "tempor",\r\n' +
+  '      "laborum",\r\n' +
+  '      "laborum",\r\n' +
+  '      "sit",\r\n' +
+  '      "sint",\r\n' +
+  '      "anim"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Lilian Battle"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Sofia Fleming"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Weber Cotton"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Kaye Casey! You have 4 unread messages.",\r\n' +
+  '    "favoriteFruit": "apple"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e55574ed3d787366dd",\r\n' +
+  '    "index": 5,\r\n' +
+  '    "guid": "83be6aaf-b5e7-4115-af40-3c69517dff12",\r\n' +
+  '    "isActive": false,\r\n' +
+  '    "balance": "$1,318.24",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 23,\r\n' +
+  '    "eyeColor": "blue",\r\n' +
+  '    "name": "Pate Horn",\r\n' +
+  '    "gender": "male",\r\n' +
+  '    "company": "GENESYNK",\r\n' +
+  '    "email": "patehorn@genesynk.com",\r\n' +
+  '    "phone": "+1 (826) 424-2702",\r\n' +
+  '    "address": "619 Schweikerts Walk, Murillo, Virginia, 4331",\r\n' +
+  '    "about": "Anim voluptate ut do nisi amet quis labore. Quis anim est labore commodo laboris irure consequat qui duis do ex reprehenderit magna. Commodo id occaecat magna eiusmod.\\r\\n",\r\n' +
+  '    "registered": "2015-05-26T03:16:26 -03:00",\r\n' +
+  '    "latitude": 62.068817,\r\n' +
+  '    "longitude": 90.165296,\r\n' +
+  '    "tags": [\r\n' +
+  '      "eu",\r\n' +
+  '      "aliqua",\r\n' +
+  '      "laborum",\r\n' +
+  '      "ipsum",\r\n' +
+  '      "non",\r\n' +
+  '      "labore",\r\n' +
+  '      "occaecat"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Lorraine Cherry"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Janice Melendez"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Tanya Warner"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Pate Horn! You have 4 unread messages.",\r\n' +
+  '    "favoriteFruit": "strawberry"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e5e067da500003a41e",\r\n' +
+  '    "index": 6,\r\n' +
+  '    "guid": "2aeb89b4-2166-48d1-b660-ea7be54c9f2b",\r\n' +
+  '    "isActive": false,\r\n' +
+  '    "balance": "$2,925.76",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 25,\r\n' +
+  '    "eyeColor": "green",\r\n' +
+  '    "name": "Margarita Townsend",\r\n' +
+  '    "gender": "female",\r\n' +
+  '    "company": "LYRIA",\r\n' +
+  '    "email": "margaritatownsend@lyria.com",\r\n' +
+  '    "phone": "+1 (966) 572-3011",\r\n' +
+  '    "address": "730 Judge Street, Enetai, Iowa, 5532",\r\n' +
+  '    "about": "Ad deserunt veniam ut pariatur deserunt laboris aliquip consectetur exercitation ea sit. Sint anim elit aute veniam. Incididunt reprehenderit cillum quis velit minim ipsum culpa fugiat cupidatat laboris nisi nulla ullamco adipisicing.\\r\\n",\r\n' +
+  '    "registered": "2015-07-26T07:19:27 -03:00",\r\n' +
+  '    "latitude": -15.753305,\r\n' +
+  '    "longitude": 44.857453,\r\n' +
+  '    "tags": [\r\n' +
+  '      "mollit",\r\n' +
+  '      "laborum",\r\n' +
+  '      "incididunt",\r\n' +
+  '      "ea",\r\n' +
+  '      "ex",\r\n' +
+  '      "minim",\r\n' +
+  '      "magna"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Trevino Powell"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Acosta Roth"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Benson Garza"\r\n' +
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+  '    "greeting": "Hello, Cassie Cunningham! You have 10 unread messages.",\r\n' +
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+  '    "address": "701 Remsen Street, Hachita, Oregon, 3684",\r\n' +
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+  '    "greeting": "Hello, Geneva Rivers! You have 2 unread messages.",\r\n' +
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+  '    "address": "770 Battery Avenue, Konterra, North Carolina, 798",\r\n' +
+  '    "about": "Est fugiat veniam commodo elit ut fugiat laborum culpa consequat adipisicing. Aute ut minim exercitation incididunt aliquip consequat velit. Eu Lorem cillum esse sunt tempor adipisicing velit pariatur commodo duis tempor eiusmod mollit esse. Sunt culpa ullamco dolore dolore. Nisi in aute et occaecat consectetur qui aute duis aliquip sunt proident.\\r\\n",\r\n' +
+  '    "registered": "2016-01-10T06:46:10 -02:00",\r\n' +
+  '    "latitude": -33.306816,\r\n' +
+  '    "longitude": 56.679905,\r\n' +
+  '    "tags": [\r\n' +
+  '      "do",\r\n' +
+  '      "anim",\r\n' +
+  '      "reprehenderit",\r\n' +
+  '      "nostrud",\r\n' +
+  '      "adipisicing",\r\n' +
+  '      "ut",\r\n' +
+  '      "pariatur"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Roberts Edwards"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Roy Barlow"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Yesenia Conner"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Carissa Willis! You have 9 unread messages.",\r\n' +
+  '    "favoriteFruit": "apple"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e524182ab79ce74069",\r\n' +
+  '    "index": 16,\r\n' +
+  '    "guid": "a1cbf0af-af18-4e76-96b4-1e5e91678f50",\r\n' +
+  '    "isActive": false,\r\n' +
+  '    "balance": "$1,231.30",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 40,\r\n' +
+  '    "eyeColor": "green",\r\n' +
+  '    "name": "Noelle Madden",\r\n' +
+  '    "gender": "female",\r\n' +
+  '    "company": "GEEKETRON",\r\n' +
+  '    "email": "noellemadden@geeketron.com",\r\n' +
+  '    "phone": "+1 (956) 549-2920",\r\n' +
+  '    "address": "391 Richardson Street, Davenport, Mississippi, 3116",\r\n' +
+  '    "about": "Duis id magna in ad magna ullamco ut velit minim est consequat. Deserunt nisi duis dolore Lorem adipisicing aliquip exercitation. Nulla do est ex duis quis dolore deserunt ipsum exercitation officia labore culpa cillum. Ullamco fugiat qui dolore sit. In ipsum officia enim non incididunt cupidatat labore id cillum Lorem id deserunt. Labore velit laboris consectetur qui deserunt quis consectetur pariatur deserunt. In cupidatat proident esse sunt esse adipisicing reprehenderit quis et anim ex.\\r\\n",\r\n' +
+  '    "registered": "2014-11-05T11:34:15 -02:00",\r\n' +
+  '    "latitude": 42.01655,\r\n' +
+  '    "longitude": -154.431165,\r\n' +
+  '    "tags": [\r\n' +
+  '      "exercitation",\r\n' +
+  '      "cupidatat",\r\n' +
+  '      "ipsum",\r\n' +
+  '      "irure",\r\n' +
+  '      "aliquip",\r\n' +
+  '      "consequat",\r\n' +
+  '      "eiusmod"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Olga Charles"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Morton Fuentes"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Melendez Randall"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Noelle Madden! You have 4 unread messages.",\r\n' +
+  '    "favoriteFruit": "strawberry"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e5a561722f88e2ae9c",\r\n' +
+  '    "index": 17,\r\n' +
+  '    "guid": "34f6b358-b8bc-4441-9081-592a2ef18c5f",\r\n' +
+  '    "isActive": true,\r\n' +
+  '    "balance": "$3,858.45",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 36,\r\n' +
+  '    "eyeColor": "brown",\r\n' +
+  '    "name": "Lori Guzman",\r\n' +
+  '    "gender": "female",\r\n' +
+  '    "company": "MITROC",\r\n' +
+  '    "email": "loriguzman@mitroc.com",\r\n' +
+  '    "phone": "+1 (981) 455-3403",\r\n' +
+  '    "address": "984 Ash Street, Eastmont, Kentucky, 8672",\r\n' +
+  '    "about": "Nulla est laborum nulla voluptate non amet esse excepteur eiusmod ex ex. Proident cupidatat minim sunt qui deserunt elit aliquip magna culpa aliqua consequat nisi eiusmod irure. Est nostrud sunt officia consectetur dolore Lorem excepteur eiusmod id consequat ipsum consectetur. Adipisicing exercitation ad aliqua in pariatur adipisicing. Fugiat elit fugiat Lorem officia sit et exercitation id.\\r\\n",\r\n' +
+  '    "registered": "2014-12-13T11:18:36 -02:00",\r\n' +
+  '    "latitude": 14.713345,\r\n' +
+  '    "longitude": -96.737292,\r\n' +
+  '    "tags": [\r\n' +
+  '      "Lorem",\r\n' +
+  '      "minim",\r\n' +
+  '      "enim",\r\n' +
+  '      "aliqua",\r\n' +
+  '      "excepteur",\r\n' +
+  '      "fugiat",\r\n' +
+  '      "laboris"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Lindsey Oneill"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Audrey Rice"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Socorro Love"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Lori Guzman! You have 8 unread messages.",\r\n' +
+  '    "favoriteFruit": "strawberry"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e53edd06a58de93e1b",\r\n' +
+  '    "index": 18,\r\n' +
+  '    "guid": "cce3334f-3ff6-4bbd-97e5-cc5fb14a57cf",\r\n' +
+  '    "isActive": false,\r\n' +
+  '    "balance": "$2,671.49",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 31,\r\n' +
+  '    "eyeColor": "brown",\r\n' +
+  '    "name": "Solis Underwood",\r\n' +
+  '    "gender": "male",\r\n' +
+  '    "company": "ECOSYS",\r\n' +
+  '    "email": "solisunderwood@ecosys.com",\r\n' +
+  '    "phone": "+1 (814) 476-2136",\r\n' +
+  '    "address": "890 Menahan Street, Wells, Missouri, 1455",\r\n' +
+  '    "about": "Non velit magna sunt magna et anim sit. Sit consequat eu labore et anim incididunt eu et in sint laboris pariatur est magna. Non consequat reprehenderit excepteur incididunt sit voluptate do in incididunt mollit proident commodo. Elit do fugiat incididunt laborum. Veniam deserunt laborum sit minim sint. Excepteur adipisicing commodo labore irure commodo mollit nisi ad aliquip. Irure cupidatat irure do enim elit ex est.\\r\\n",\r\n' +
+  '    "registered": "2016-01-19T09:51:10 -02:00",\r\n' +
+  '    "latitude": -54.575181,\r\n' +
+  '    "longitude": 84.036429,\r\n' +
+  '    "tags": [\r\n' +
+  '      "pariatur",\r\n' +
+  '      "officia",\r\n' +
+  '      "sunt",\r\n' +
+  '      "aliqua",\r\n' +
+  '      "reprehenderit",\r\n' +
+  '      "amet",\r\n' +
+  '      "qui"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Savannah Vargas"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Cornelia Pratt"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Bettie Odonnell"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Solis Underwood! You have 4 unread messages.",\r\n' +
+  '    "favoriteFruit": "banana"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e5f2fd7e8024c25058",\r\n' +
+  '    "index": 19,\r\n' +
+  '    "guid": "a2b250dd-2fe7-401b-824d-10bdc5168def",\r\n' +
+  '    "isActive": true,\r\n' +
+  '    "balance": "$1,027.87",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 40,\r\n' +
+  '    "eyeColor": "green",\r\n' +
+  '    "name": "Kennedy Blackwell",\r\n' +
+  '    "gender": "male",\r\n' +
+  '    "company": "ACCRUEX",\r\n' +
+  '    "email": "kennedyblackwell@accruex.com",\r\n' +
+  '    "phone": "+1 (984) 418-3932",\r\n' +
+  '    "address": "365 Garland Court, Orovada, Maryland, 7323",\r\n' +
+  '    "about": "In ex pariatur irure labore. Aliqua quis aliquip cillum reprehenderit ad tempor reprehenderit ad. Qui tempor quis ad do culpa exercitation in non eiusmod esse sint. Pariatur aliquip elit duis culpa. Dolore ad deserunt laboris ullamco fugiat ex veniam pariatur enim laboris non. Est eiusmod dolor Lorem duis.\\r\\n",\r\n' +
+  '    "registered": "2015-01-04T03:33:07 -02:00",\r\n' +
+  '    "latitude": -87.117942,\r\n' +
+  '    "longitude": 121.076386,\r\n' +
+  '    "tags": [\r\n' +
+  '      "incididunt",\r\n' +
+  '      "exercitation",\r\n' +
+  '      "tempor",\r\n' +
+  '      "sint",\r\n' +
+  '      "eu",\r\n' +
+  '      "non",\r\n' +
+  '      "occaecat"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Wood Stephens"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Clemons Mayer"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Wong Wolf"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Kennedy Blackwell! You have 1 unread messages.",\r\n' +
+  '    "favoriteFruit": "strawberry"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e567a1ebc39e06f990",\r\n' +
+  '    "index": 20,\r\n' +
+  '    "guid": "3adc2be9-d985-41eb-8000-d32f922d96c4",\r\n' +
+  '    "isActive": false,\r\n' +
+  '    "balance": "$1,610.70",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 37,\r\n' +
+  '    "eyeColor": "blue",\r\n' +
+  '    "name": "Coffey Mason",\r\n' +
+  '    "gender": "male",\r\n' +
+  '    "company": "PHOLIO",\r\n' +
+  '    "email": "coffeymason@pholio.com",\r\n' +
+  '    "phone": "+1 (936) 590-3032",\r\n' +
+  '    "address": "635 Frost Street, Malo, California, 9398",\r\n' +
+  '    "about": "Cupidatat nulla aute dolore fugiat. Fugiat eu labore do amet culpa incididunt ullamco do. Occaecat in quis do in. Labore elit exercitation anim ut duis deserunt labore amet quis. Mollit aliqua proident anim excepteur aliqua excepteur quis do Lorem minim sunt officia Lorem.\\r\\n",\r\n' +
+  '    "registered": "2014-12-04T10:16:32 -02:00",\r\n' +
+  '    "latitude": -31.999848,\r\n' +
+  '    "longitude": -123.898345,\r\n' +
+  '    "tags": [\r\n' +
+  '      "pariatur",\r\n' +
+  '      "sint",\r\n' +
+  '      "elit",\r\n' +
+  '      "Lorem",\r\n' +
+  '      "Lorem",\r\n' +
+  '      "fugiat",\r\n' +
+  '      "duis"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Shepard Rowland"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Caldwell George"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Howell Mccarty"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Coffey Mason! You have 4 unread messages.",\r\n' +
+  '    "favoriteFruit": "strawberry"\r\n' +
+  "  },\r\n" +
+  "  {\r\n" +
+  '    "_id": "5789f4e5b3f86b2cb775595e",\r\n' +
+  '    "index": 21,\r\n' +
+  '    "guid": "73b9522e-ea10-43df-b221-61baa4c563ed",\r\n' +
+  '    "isActive": false,\r\n' +
+  '    "balance": "$2,434.93",\r\n' +
+  '    "picture": "http://placehold.it/32x32",\r\n' +
+  '    "age": 20,\r\n' +
+  '    "eyeColor": "green",\r\n' +
+  '    "name": "Soto Chase",\r\n' +
+  '    "gender": "male",\r\n' +
+  '    "company": "MONDICIL",\r\n' +
+  '    "email": "sotochase@mondicil.com",\r\n' +
+  '    "phone": "+1 (966) 490-3146",\r\n' +
+  '    "address": "878 Beverly Road, Blende, Connecticut, 4465",\r\n' +
+  '    "about": "Esse consequat in consequat veniam amet laboris occaecat et ea ipsum reprehenderit. Sunt officia anim labore nulla qui elit laborum et et excepteur dolor ex. Tempor elit aliquip labore et amet. Veniam aliquip sint minim tempor labore sunt. Officia est amet mollit qui mollit commodo adipisicing qui. Dolore anim consectetur enim dolore commodo sit ut et eiusmod occaecat esse tempor elit. Occaecat ad nulla adipisicing veniam veniam excepteur esse anim.\\r\\n",\r\n' +
+  '    "registered": "2015-06-19T10:14:08 -03:00",\r\n' +
+  '    "latitude": -47.396646,\r\n' +
+  '    "longitude": -30.952543,\r\n' +
+  '    "tags": [\r\n' +
+  '      "eu",\r\n' +
+  '      "labore",\r\n' +
+  '      "ipsum",\r\n' +
+  '      "nisi",\r\n' +
+  '      "incididunt",\r\n' +
+  '      "sunt",\r\n' +
+  '      "Lorem"\r\n' +
+  "    ],\r\n" +
+  '    "friends": [\r\n' +
+  "      {\r\n" +
+  '        "id": 0,\r\n' +
+  '        "name": "Susan Camacho"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 1,\r\n' +
+  '        "name": "Wilkerson Clements"\r\n' +
+  "      },\r\n" +
+  "      {\r\n" +
+  '        "id": 2,\r\n' +
+  '        "name": "Mable Fletcher"\r\n' +
+  "      }\r\n" +
+  "    ],\r\n" +
+  '    "greeting": "Hello, Soto Chase! You have 5 unread messages.",\r\n' +
+  '    "favoriteFruit": "banana"\r\n' +
+  "  }\r\n" +
+  "]";
diff --git a/packages/lang-json/test/test-json.ts b/packages/lang-json/test/test-json.ts
new file mode 100644
index 00000000..921b2828
--- /dev/null
+++ b/packages/lang-json/test/test-json.ts
@@ -0,0 +1,85 @@
+import {describe, it} from 'node:test';
+import assert from 'node:assert';
+import fs from 'node:fs';
+import path from 'node:path';
+import {fileURLToPath} from 'node:url';
+
+import {grammar} from '@ohm-js/compiler/compat';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const resolve = (relPath: string) => path.join(__dirname, relPath);
+
+const ohmSource = fs.readFileSync(resolve('../json.ohm'), 'utf-8');
+const json = grammar(ohmSource);
+
+describe('JSON grammar', () => {
+  it('should compile the grammar without errors', () => {
+    assert.ok(json);
+    assert.ok(
+      json.name.endsWith('JSON'),
+      `Expected name to end with 'JSON', got: ${JSON.stringify(json.name)}`
+    );
+  });
+
+  it('should parse an empty object', () => {
+    json.match('{}').use(r => {
+      assert.ok(r.succeeded(), r.failed() ? r.message : '');
+    });
+  });
+
+  it('should parse an empty array', () => {
+    json.match('[]').use(r => {
+      assert.ok(r.succeeded(), r.failed() ? r.message : '');
+    });
+  });
+
+  it('should parse a string', () => {
+    json.match('"hello"').use(r => {
+      assert.ok(r.succeeded(), r.failed() ? r.message : '');
+    });
+  });
+
+  it('should parse numbers', () => {
+    for (const input of ['0', '42', '-1', '3.14', '1e10', '2.5E-3']) {
+      json.match(input).use(r => {
+        assert.ok(r.succeeded(), `Failed to parse ${input}: ${r.failed() ? r.message : ''}`);
+      });
+    }
+  });
+
+  it('should parse true, false, and null', () => {
+    for (const input of ['true', 'false', 'null']) {
+      json.match(input).use(r => {
+        assert.ok(r.succeeded(), `Failed to parse ${input}: ${r.failed() ? r.message : ''}`);
+      });
+    }
+  });
+
+  it('should parse a simple object', () => {
+    json.match('{"key": "value", "num": 42}').use(r => {
+      assert.ok(r.succeeded(), r.failed() ? r.message : '');
+    });
+  });
+
+  it('should parse nested structures', () => {
+    const input = '{"a": [1, 2, {"b": true}], "c": null}';
+    json.match(input).use(r => {
+      assert.ok(r.succeeded(), r.failed() ? r.message : '');
+    });
+  });
+
+  it('should parse strings with escape sequences', () => {
+    const input = '"hello\\nworld\\t\\"escaped\\"\\u0041"';
+    json.match(input).use(r => {
+      assert.ok(r.succeeded(), r.failed() ? r.message : '');
+    });
+  });
+
+  it('should reject invalid JSON', () => {
+    for (const input of ['{key: "value"}', "'string'", '{,}']) {
+      json.match(input).use(r => {
+        assert.ok(r.failed(), `Expected parse to fail for: ${input}`);
+      });
+    }
+  });
+});
diff --git a/packages/lang-json/tsconfig.json b/packages/lang-json/tsconfig.json
new file mode 100644
index 00000000..d1d1750f
--- /dev/null
+++ b/packages/lang-json/tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "../tsconfig.base.json",
+  "include": ["*.ts", "test/**/*.ts"]
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 0ec79fab..8fe3c2ff 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -217,7 +217,18 @@ importers:
 
   packages/labrat: {}
 
-  packages/lang-json: {}
+  packages/lang-json:
+    dependencies:
+      '@ohm-js/compiler':
+        specifier: workspace:*
+        version: link:../compiler
+      ohm-js:
+        specifier: workspace:*
+        version: link:../runtime
+    devDependencies:
+      tinybench:
+        specifier: ^6.0.0
+        version: 6.0.0
 
   packages/lang-python:
     dependencies: