diff --git a/cli/package-lock.json b/cli/package-lock.json
index 4304111..13e2b74 100644
--- a/cli/package-lock.json
+++ b/cli/package-lock.json
@@ -1,9 +1,44 @@
 {
   "name": "geojson-playground",
-  "version": "0.4.0",
+  "version": "0.6.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@mapbox/geojsonhint": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@mapbox/geojsonhint/-/geojsonhint-3.0.0.tgz",
+      "integrity": "sha512-zHcyh1rDHYnEBd6NvOWoeHLuvazlDkIjvz9MJx4cKwcKTlfrqgxVnTv1QLnVJnsSU5neJnhQJcgscR/Zl4uYgw==",
+      "requires": {
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+        "jsonlint-lines": "1.7.1",
+        "minimist": "1.2.0",
+        "vfile": "^4.0.0",
+        "vfile-reporter": "^5.1.1"
+      }
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+    "@mapbox/point-geometry": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/@mapbox/point-geometry/-/point-geometry-0.1.0.tgz",
+      "integrity": "sha1-ioP5M1x4YO/6Lu7KJUMyqgru2PI="
+    },
+    "@mapbox/vector-tile": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/@mapbox/vector-tile/-/vector-tile-1.3.1.tgz",
+      "integrity": "sha512-MCEddb8u44/xfQ3oD+Srl/tNcQoqTw3goGk2oLsrFxOTc3dUp+kAnby3PvAeeBYSMSjSPD1nd1AJA6W49WnoUw==",
+      "requires": {
+        "@mapbox/point-geometry": "~0.1.0"
+      }
+    },
+    "@types/unist": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/@types/unist/-/unist-2.0.3.tgz",
+      "integrity": "sha512-FvUupuM3rlRsRtCN+fDudtmytGO6iHJuuRKS1Ss0pG5z8oX0diNEw94UEL7hgDbpN94rgaK5R7sWm6RrSkZuAQ=="
+    },
+    "JSV": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/JSV/-/JSV-4.0.2.tgz",
+      "integrity": "sha1-0Hf2glVx+CEy+d/67Vh7QCn+/1c="
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       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.7.tgz",
@@ -13,6 +48,16 @@
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+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-3.0.0.tgz",
+      "integrity": "sha1-7QMXwyIGT3lGbAKWa922Bas32Zg="
+    },
+    "ansi-styles": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-1.0.0.tgz",
+      "integrity": "sha1-yxAt8cVvUSPquLZ817mAJ6AnkXg="
+    },
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       "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
@@ -35,16 +80,42 @@
         "type-is": "~1.6.17"
       }
     },
+    "buffer-from": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/buffer-from/-/buffer-from-1.1.1.tgz",
+      "integrity": "sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A=="
+    },
     "bytes": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.0.tgz",
       "integrity": "sha512-zauLjrfCG+xvoyaqLoV8bLVXXNGC4JqlxFCutSDWA6fJrTo2ZuvLYTqZ7aHBLZSMOopbzwv8f+wZcVzfVTI2Dg=="
     },
+    "chalk": {
+      "version": "0.4.0",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-0.4.0.tgz",
+      "integrity": "sha1-UZmj3c0MHv4jvAjBsCewYXbgxk8=",
+      "requires": {
+        "ansi-styles": "~1.0.0",
+        "has-color": "~0.1.0",
+        "strip-ansi": "~0.1.0"
+      }
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     "commander": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/commander/-/commander-4.0.1.tgz",
       "integrity": "sha512-IPF4ouhCP+qdlcmCedhxX4xiGBPyigb8v5NeUp+0LyhwLgxMqyp3S0vl7TAPfS/hiP7FC3caI/PB9lTmP8r1NA=="
     },
+    "concat-stream": {
+      "version": "1.6.2",
+      "resolved": "https://registry.npmjs.org/concat-stream/-/concat-stream-1.6.2.tgz",
+      "integrity": "sha512-27HBghJxjiZtIk3Ycvn/4kbJk/1uZuJFfuPEns6LaEvpvG1f0hTea8lilrouyo9mVc2GWdcEZ8OLoGmSADlrCw==",
+      "requires": {
+        "buffer-from": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^2.2.2",
+        "typedarray": "^0.0.6"
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     "content-disposition": {
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       "resolved": "https://registry.npmjs.org/content-disposition/-/content-disposition-0.5.3.tgz",
@@ -68,6 +139,11 @@
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       "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
     },
+    "core-util-is": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+      "integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac="
+    },
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       "resolved": "https://registry.npmjs.org/cors/-/cors-2.8.5.tgz",
@@ -176,6 +252,11 @@
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       "integrity": "sha1-PYyt2Q2XZWn6g1qx+OSyOhBWBac="
     },
+    "geojson-vt": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/geojson-vt/-/geojson-vt-3.2.1.tgz",
+      "integrity": "sha512-EvGQQi/zPrDA6zr6BnJD/YhwAkBP8nnJ9emh3EnHQKVMfg/MRVtPbMYdgVy/IaEmn4UfagD2a6fafPDL5hbtwg=="
+    },
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       "resolved": "https://registry.npmjs.org/get-port/-/get-port-5.0.0.tgz",
@@ -184,6 +265,16 @@
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       }
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+    "has-color": {
+      "version": "0.1.7",
+      "resolved": "https://registry.npmjs.org/has-color/-/has-color-0.1.7.tgz",
+      "integrity": "sha1-ZxRKUmDDT8PMpnfQQdr1L+e3iy8="
+    },
+    "has-flag": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/has-flag/-/has-flag-3.0.0.tgz",
+      "integrity": "sha1-tdRU3CGZriJWmfNGfloH87lVuv0="
+    },
     "http-errors": {
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-1.7.2.tgz",
@@ -204,6 +295,11 @@
         "safer-buffer": ">= 2.1.2 < 3"
       }
     },
+    "ieee754": {
+      "version": "1.1.13",
+      "resolved": "https://registry.npmjs.org/ieee754/-/ieee754-1.1.13.tgz",
+      "integrity": "sha512-4vf7I2LYV/HaWerSo3XmlMkp5eZ83i+/CDluXi/IGTs/O1sejBNhTtnxzmRZfvOUqj7lZjqHkeTvpgSFDlWZTg=="
+    },
     "inherits": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
@@ -214,6 +310,30 @@
       "resolved": "https://registry.npmjs.org/ipaddr.js/-/ipaddr.js-1.9.0.tgz",
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     },
+    "is-buffer": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/is-buffer/-/is-buffer-2.0.4.tgz",
+      "integrity": "sha512-Kq1rokWXOPXWuaMAqZiJW4XxsmD9zGx9q4aePabbn3qCRGedtH7Cm+zV8WETitMfu1wdh+Rvd6w5egwSngUX2A=="
+    },
+    "is-fullwidth-code-point": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/is-fullwidth-code-point/-/is-fullwidth-code-point-2.0.0.tgz",
+      "integrity": "sha1-o7MKXE8ZkYMWeqq5O+764937ZU8="
+    },
+    "isarray": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/isarray/-/isarray-1.0.0.tgz",
+      "integrity": "sha1-u5NdSFgsuhaMBoNJV6VKPgcSTxE="
+    },
+    "jsonlint-lines": {
+      "version": "1.7.1",
+      "resolved": "https://registry.npmjs.org/jsonlint-lines/-/jsonlint-lines-1.7.1.tgz",
+      "integrity": "sha1-UH3mgNP7jEvhZBzFfW9nnynxeP8=",
+      "requires": {
+        "JSV": ">= 4.0.x",
+        "nomnom": ">= 1.5.x"
+      }
+    },
     "media-typer": {
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       "resolved": "https://registry.npmjs.org/media-typer/-/media-typer-0.3.0.tgz",
@@ -247,6 +367,11 @@
         "mime-db": "1.42.0"
       }
     },
+    "minimist": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
+      "integrity": "sha1-o1AIsg9BOD7sH7kU9M1d95omQoQ="
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@@ -257,6 +382,20 @@
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     },
+    "node-fetch": {
+      "version": "2.6.1",
+      "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.1.tgz",
+      "integrity": "sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw=="
+    },
+    "nomnom": {
+      "version": "1.8.1",
+      "resolved": "https://registry.npmjs.org/nomnom/-/nomnom-1.8.1.tgz",
+      "integrity": "sha1-IVH3Ikcrp55Qp2/BJbuMjy5Nwqc=",
+      "requires": {
+        "chalk": "~0.4.0",
+        "underscore": "~1.6.0"
+      }
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     "object-assign": {
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       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
@@ -280,6 +419,25 @@
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       "integrity": "sha1-32BBeABfUi8V60SQ5yR6G/qmf4w="
     },
+    "pbf": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/pbf/-/pbf-3.2.1.tgz",
+      "integrity": "sha512-ClrV7pNOn7rtmoQVF4TS1vyU0WhYRnP92fzbfF75jAIwpnzdJXf8iTd4CMEqO4yUenH6NDqLiwjqlh6QgZzgLQ==",
+      "requires": {
+        "ieee754": "^1.1.12",
+        "resolve-protobuf-schema": "^2.1.0"
+      }
+    },
+    "process-nextick-args": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/process-nextick-args/-/process-nextick-args-2.0.1.tgz",
+      "integrity": "sha512-3ouUOpQhtgrbOa17J7+uxOTpITYWaGP7/AhoR3+A+/1e9skrzelGi/dXzEYyvbxubEF6Wn2ypscTKiKJFFn1ag=="
+    },
+    "protocol-buffers-schema": {
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/protocol-buffers-schema/-/protocol-buffers-schema-3.4.0.tgz",
+      "integrity": "sha512-G/2kcamPF2S49W5yaMGdIpkG6+5wZF0fzBteLKgEHjbNzqjZQ85aAs1iJGto31EJaSTkNvHs5IXuHSaTLWBAiA=="
+    },
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@@ -310,6 +468,38 @@
         "unpipe": "1.0.0"
       }
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+      "version": "2.3.7",
+      "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
+      "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
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+        "inherits": "~2.0.3",
+        "isarray": "~1.0.0",
+        "process-nextick-args": "~2.0.0",
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+        "util-deprecate": "~1.0.1"
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+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/repeat-string/-/repeat-string-1.6.1.tgz",
+      "integrity": "sha1-jcrkcOHIirwtYA//Sndihtp15jc="
+    },
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+      "resolved": "https://registry.npmjs.org/replace-ext/-/replace-ext-1.0.0.tgz",
+      "integrity": "sha1-3mMSg3P8v3w8z6TeWkgMRaZ5WOs="
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+      "resolved": "https://registry.npmjs.org/resolve-protobuf-schema/-/resolve-protobuf-schema-2.1.0.tgz",
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@@ -368,6 +558,46 @@
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       "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow="
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+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-2.1.1.tgz",
+      "integrity": "sha512-nOqH59deCq9SRHlxq1Aw85Jnt4w6KvLKqWVik6oA9ZklXLNIOlqg4F2yrT1MVaTjAqvVwdfeZ7w7aCvJD7ugkw==",
+      "requires": {
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+          "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-4.0.0.tgz",
+          "integrity": "sha1-qEeQIusaw2iocTibY1JixQXuNo8=",
+          "requires": {
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+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
+      "requires": {
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+    "strip-ansi": {
+      "version": "0.1.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-0.1.1.tgz",
+      "integrity": "sha1-OeipjQRNFQZgq+SmgIrPcLt7yZE="
+    },
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+      "version": "5.5.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-5.5.0.tgz",
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@@ -387,11 +617,34 @@
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+      "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
+      "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
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+      "integrity": "sha1-izixDKze9jM3uLJOT/htRa6lKag="
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       "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw="
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+      "resolved": "https://registry.npmjs.org/vfile-sort/-/vfile-sort-2.2.2.tgz",
+      "integrity": "sha512-tAyUqD2R1l/7Rn7ixdGkhXLD3zsg+XLAeUDUhXearjfIcpL1Hcsj5hHpCoy/gvfK/Ws61+e972fm0F7up7hfYA=="
+    },
+    "vfile-statistics": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/vfile-statistics/-/vfile-statistics-1.1.4.tgz",
+      "integrity": "sha512-lXhElVO0Rq3frgPvFBwahmed3X03vjPF8OcjKMy8+F1xU/3Q3QU3tKEDp743SFtb74PdF0UWpxPvtOP0GCLheA=="
+    },
+    "vt-pbf": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/vt-pbf/-/vt-pbf-3.1.1.tgz",
+      "integrity": "sha512-pHjWdrIoxurpmTcbfBWXaPwSmtPAHS105253P1qyEfSTV2HJddqjM+kIHquaT/L6lVJIk9ltTGc0IxR/G47hYA==",
+      "requires": {
+        "@mapbox/point-geometry": "0.1.0",
+        "@mapbox/vector-tile": "^1.3.1",
+        "pbf": "^3.0.5"
+      }
     }
   }
 }
diff --git a/cli/package.json b/cli/package.json
index 83f3739..ea03d66 100644
--- a/cli/package.json
+++ b/cli/package.json
@@ -13,7 +13,7 @@
     "express": "^4.17.1",
     "geojson-vt": "^3.2.1",
     "get-port": "^5.0.0",
-    "node-fetch": "^2.6.0",
+    "node-fetch": "^2.6.1",
     "vt-pbf": "^3.1.1"
   }
 }
diff --git a/cli/yarn.lock b/cli/yarn.lock
index 375a182..d6ff3a1 100644
--- a/cli/yarn.lock
+++ b/cli/yarn.lock
@@ -385,10 +385,10 @@ negotiator@0.6.2:
   resolved "https://registry.yarnpkg.com/negotiator/-/negotiator-0.6.2.tgz#feacf7ccf525a77ae9634436a64883ffeca346fb"
   integrity sha512-hZXc7K2e+PgeI1eDBe/10Ard4ekbfrrqG8Ep+8Jmf4JID2bNg7NvCPOZN+kfF574pFQI7mum2AUqDidoKqcTOw==
 
-node-fetch@^2.6.0:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.6.0.tgz#e633456386d4aa55863f676a7ab0daa8fdecb0fd"
-  integrity sha512-8dG4H5ujfvFiqDmVu9fQ5bOHUC15JMjMY/Zumv26oOvvVJjM67KF8koCWIabKQ1GJIa9r2mMZscBq/TbdOcmNA==
+node-fetch@^2.6.1:
+  version "2.6.1"
+  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.6.1.tgz#045bd323631f76ed2e2b55573394416b639a0052"
+  integrity sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw==
 
 "nomnom@>= 1.5.x":
   version "1.8.1"