diff --git a/examples/schemas/biosamples-schema.json b/examples/schemas/biosamples-schema.json
index 0e2f312..2765180 100644
--- a/examples/schemas/biosamples-schema.json
+++ b/examples/schemas/biosamples-schema.json
@@ -1,5 +1,6 @@
 {
   "$schema": "http://json-schema.org/draft-07/schema#",
+  "$id": "test/biosamples/schema",
   "title": "Sample",
   "description": "A BioSamples sample.",
 
diff --git a/package-lock.json b/package-lock.json
index 6b157f0..25d0803 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -11,6 +11,7 @@
       "dependencies": {
         "ajv": "~7.2.1",
         "ajv-formats": "^1.5.1",
+        "canvas": "^2.8.0",
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         "glob": "^8.0.3",
         "npid": "^0.4.0",
@@ -27,6 +28,7 @@
         "bufferutil": "^4.0.2",
         "jest": "^26.6.0",
         "nodemon": "^2.0.6",
+        "supertest": "^6.3.3",
         "ts-node": "^9.1.0",
         "typescript": "^4.1.2",
         "utf-8-validate": "^5.0.3"
@@ -897,9 +899,6 @@
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-      "optional": true,
-      "peer": true,
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@@ -919,9 +918,6 @@
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-      "dev": true,
-      "optional": true,
-      "peer": true,
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@@ -936,9 +932,6 @@
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-      "dev": true,
-      "optional": true,
-      "peer": true,
       "dependencies": {
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@@ -1098,8 +1091,7 @@
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-      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
-      "dev": true
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="
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@@ -1167,7 +1159,6 @@
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-      "dev": true,
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@@ -1179,7 +1170,6 @@
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-      "dev": true,
       "dependencies": {
         "ms": "2.1.2"
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@@ -1195,8 +1185,7 @@
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-      "dev": true
+      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
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     "node_modules/ajv": {
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@@ -1302,18 +1291,12 @@
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-      "dev": true,
-      "optional": true,
-      "peer": true
+      "integrity": "sha512-lYe4Gx7QT+MKGbDsA+Z+he/Wtef0BiwDOlK/XkBrdfsh9J/jPPXbX0tE9x9cl27Tmu5gg3QUbUrQYa/y+KOHPQ=="
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     "node_modules/are-we-there-yet": {
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@@ -1326,9 +1309,6 @@
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-      "dev": true,
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         "string_decoder": "^1.1.1",
@@ -1394,6 +1374,12 @@
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       }
     },
+    "node_modules/asap": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/asap/-/asap-2.0.6.tgz",
+      "integrity": "sha512-BSHWgDSAiKs50o2Re8ppvp3seVHXSRM44cdSsT9FfNEUUZLOGWVCsiWaRPWM1Znn+mqZ1OfVZ3z3DWEzSp7hRA==",
+      "dev": true
+    },
     "node_modules/asn1": {
       "version": "0.2.3",
       "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz",
@@ -1666,7 +1652,6 @@
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-      "dev": true,
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         "concat-map": "0.0.1"
@@ -1743,6 +1728,19 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/call-bind": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.2.tgz",
+      "integrity": "sha512-7O+FbCihrB5WGbFYesctwmTKae6rOiIzmz1icreWJ+0aA7LJfuqhEso2T9ncpcFtzMQtzXf2QGGueWJGTYsqrA==",
+      "dev": true,
+      "dependencies": {
+        "function-bind": "^1.1.1",
+        "get-intrinsic": "^1.0.2"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/callsites": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/callsites/-/callsites-3.1.0.tgz",
@@ -1756,10 +1754,7 @@
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-      "optional": true,
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@@ -1842,9 +1837,6 @@
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@@ -1962,9 +1954,6 @@
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-      "dev": true,
-      "optional": true,
-      "peer": true,
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@@ -2011,16 +2000,12 @@
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-      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
-      "dev": true
+      "integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s="
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     "node_modules/console-control-strings": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
-      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
-      "dev": true,
-      "optional": true,
-      "peer": true
+      "integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4="
     },
     "node_modules/content-disposition": {
       "version": "0.5.3",
@@ -2068,6 +2053,12 @@
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       "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
     },
+    "node_modules/cookiejar": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/cookiejar/-/cookiejar-2.1.4.tgz",
+      "integrity": "sha512-LDx6oHrK+PhzLKJU9j5S7/Y3jM/mUHvD/DeI1WQmJn652iPC5Y4TBzC9l+5OMOXlyTTA+SmVUPm0HQUwpD5Jqw==",
+      "dev": true
+    },
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       "resolved": "https://registry.npmjs.org/copy-descriptor/-/copy-descriptor-0.1.1.tgz",
@@ -2270,10 +2261,7 @@
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-      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o=",
-      "dev": true,
-      "optional": true,
-      "peer": true
+      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o="
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@@ -2292,9 +2280,6 @@
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       "bin": {
         "detect-libc": "bin/detect-libc.js"
       },
@@ -2311,6 +2296,16 @@
         "node": ">=8"
       }
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+    "node_modules/dezalgo": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/dezalgo/-/dezalgo-1.0.4.tgz",
+      "integrity": "sha512-rXSP0bf+5n0Qonsb+SVVfNfIsimO4HEtmnIpPHY8Q1UCzKlQrDMfdobr8nJOOsRgWCyMRqeSBQzmWUMq7zvVig==",
+      "dev": true,
+      "dependencies": {
+        "asap": "^2.0.0",
+        "wrappy": "1"
+      }
+    },
     "node_modules/diagnostics": {
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@@ -2786,9 +2781,9 @@
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+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/fast-safe-stringify/-/fast-safe-stringify-2.1.1.tgz",
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     "node_modules/fb-watchman": {
       "version": "2.0.1",
@@ -2871,6 +2866,36 @@
         "node": ">= 0.12"
       }
     },
+    "node_modules/formidable": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/formidable/-/formidable-2.1.2.tgz",
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+      "dev": true,
+      "dependencies": {
+        "dezalgo": "^1.0.4",
+        "hexoid": "^1.0.0",
+        "once": "^1.4.0",
+        "qs": "^6.11.0"
+      },
+      "funding": {
+        "url": "https://ko-fi.com/tunnckoCore/commissions"
+      }
+    },
+    "node_modules/formidable/node_modules/qs": {
+      "version": "6.11.0",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.11.0.tgz",
+      "integrity": "sha512-MvjoMCJwEarSbUYk5O+nmoSzSutSsTwF85zcHPQ9OrlFoZOYIjaqBAJIqIXjptyD5vThxGq52Xu/MaJzRkIk4Q==",
+      "dev": true,
+      "dependencies": {
+        "side-channel": "^1.0.4"
+      },
+      "engines": {
+        "node": ">=0.6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/forwarded": {
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       "resolved": "https://registry.npmjs.org/forwarded/-/forwarded-0.1.2.tgz",
@@ -2903,9 +2928,6 @@
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-      "dev": true,
-      "optional": true,
-      "peer": true,
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@@ -2942,9 +2964,6 @@
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-      "dev": true,
-      "optional": true,
-      "peer": true,
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         "color-support": "^1.1.2",
@@ -2977,6 +2996,20 @@
         "node": "6.* || 8.* || >= 10.*"
       }
     },
+    "node_modules/get-intrinsic": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/get-intrinsic/-/get-intrinsic-1.2.0.tgz",
+      "integrity": "sha512-L049y6nFOuom5wGyRc3/gdTLO94dySVKRACj1RmJZBQXlbTMhtNIgkWkUHq+jYmZvKf14EW1EoJnnjbmoHij0Q==",
+      "dev": true,
+      "dependencies": {
+        "function-bind": "^1.1.1",
+        "has": "^1.0.3",
+        "has-symbols": "^1.0.3"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/get-package-type": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/get-package-type/-/get-package-type-0.1.0.tgz",
@@ -3148,13 +3181,22 @@
         "node": ">=8"
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+    "node_modules/has-symbols": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/has-symbols/-/has-symbols-1.0.3.tgz",
+      "integrity": "sha512-l3LCuF6MgDNwTDKkdYGEihYjt5pRPbEg46rtlmnSPlUbgmB8LOIrKJbYYFBSbnPaJexMKtiPO8hmeRjRz2Td+A==",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
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-      "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk=",
-      "dev": true,
-      "optional": true,
-      "peer": true
+      "integrity": "sha1-4Ob+aijPUROIVeCG0Wkedx3iqLk="
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     "node_modules/has-value": {
       "version": "1.0.0",
@@ -3219,6 +3261,15 @@
         "node": ">=0.10.0"
       }
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+    "node_modules/hexoid": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/hexoid/-/hexoid-1.0.0.tgz",
+      "integrity": "sha512-QFLV0taWQOZtvIRIAdBChesmogZrtuXvVWsFHZTk2SU+anspqZ2vMnoLg7IE1+Uk16N19APic1BuF8bC8c2m5g==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/hosted-git-info": {
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@@ -3313,7 +3364,6 @@
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-      "dev": true,
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@@ -3326,7 +3376,6 @@
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-      "dev": true,
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@@ -3342,8 +3391,7 @@
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-      "dev": true
+      "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
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     "node_modules/human-signals": {
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@@ -5065,7 +5113,6 @@
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-      "dev": true,
-      "optional": true,
-      "peer": true,
       "requires": {
         "yallist": "^4.0.0"
       }
@@ -12403,9 +12558,6 @@
       "version": "2.1.2",
       "resolved": "https://registry.npmjs.org/minizlib/-/minizlib-2.1.2.tgz",
       "integrity": "sha512-bAxsR8BVfj60DWXHE3u30oHzfl4G7khkSuPW+qvpd7jFRHm7dLxOjUk1EHACJ/hxLY8phGJ0YhYHZo7jil7Qdg==",
-      "dev": true,
-      "optional": true,
-      "peer": true,
       "requires": {
         "minipass": "^3.0.0",
         "yallist": "^4.0.0"
@@ -12435,10 +12587,7 @@
     "mkdirp": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-1.0.4.tgz",
-      "integrity": "sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw==",
-      "dev": true,
-      "optional": true,
-      "peer": true
+      "integrity": "sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw=="
     },
     "moment": {
       "version": "2.29.4",
@@ -12453,10 +12602,7 @@
     "nan": {
       "version": "2.15.0",
       "resolved": "https://registry.npmjs.org/nan/-/nan-2.15.0.tgz",
-      "integrity": "sha512-8ZtvEnA2c5aYCZYd1cvgdnU6cqwixRoYg70xPLWUws5ORTa/lnw+u4amixRS/Ac5U5mQVgp9pnlSUnbNWFaWZQ==",
-      "dev": true,
-      "optional": true,
-      "peer": true
+      "integrity": "sha512-8ZtvEnA2c5aYCZYd1cvgdnU6cqwixRoYg70xPLWUws5ORTa/lnw+u4amixRS/Ac5U5mQVgp9pnlSUnbNWFaWZQ=="
     },
     "nanomatch": {
       "version": "1.2.13",
@@ -12498,9 +12644,6 @@
       "version": "2.6.7",
       "resolved": "https://registry.npmjs.org/node-fetch/-/node-fetch-2.6.7.tgz",
       "integrity": "sha512-ZjMPFEfVx5j+y2yF35Kzx5sF7kDzxuDj6ziH4FFbOp87zKDZNx8yExJIb05OGF4Nlt9IHFIMBkRl41VdvcNdbQ==",
-      "dev": true,
-      "optional": true,
-      "peer": true,
       "requires": {
         "whatwg-url": "^5.0.0"
       },
@@ -12508,26 +12651,17 @@
         "tr46": {
           "version": "0.0.3",
           "resolved": "https://registry.npmjs.org/tr46/-/tr46-0.0.3.tgz",
-          "integrity": "sha1-gYT9NH2snNwYWZLzpmIuFLnZq2o=",
-          "dev": true,
-          "optional": true,
-          "peer": true
+          "integrity": "sha1-gYT9NH2snNwYWZLzpmIuFLnZq2o="
         },
         "webidl-conversions": {
           "version": "3.0.1",
           "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-3.0.1.tgz",
-          "integrity": "sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE=",
-          "dev": true,
-          "optional": true,
-          "peer": true
+          "integrity": "sha1-JFNCdeKnvGvnvIZhHMFq4KVlSHE="
         },
         "whatwg-url": {
           "version": "5.0.0",
           "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-5.0.0.tgz",
           "integrity": "sha1-lmRU6HZUYuN2RNNib2dCzotwll0=",
-          "dev": true,
-          "optional": true,
-          "peer": true,
           "requires": {
             "tr46": "~0.0.3",
             "webidl-conversions": "^3.0.0"
@@ -12698,9 +12832,6 @@
       "version": "5.0.1",
       "resolved": "https://registry.npmjs.org/npmlog/-/npmlog-5.0.1.tgz",
       "integrity": "sha512-AqZtDUWOMKs1G/8lwylVjrdYgqA4d9nu8hc+0gzRxlDb1I10+FHBGMXs6aiQHFdCUUlqH99MUMuLfzWDNDtfxw==",
-      "dev": true,
-      "optional": true,
-      "peer": true,
       "requires": {
         "are-we-there-yet": "^2.0.0",
         "console-control-strings": "^1.1.0",
@@ -12722,10 +12853,7 @@
     "object-assign": {
       "version": "4.1.1",
       "resolved": "https://registry.npmjs.org/object-assign/-/object-assign-4.1.1.tgz",
-      "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM=",
-      "dev": true,
-      "optional": true,
-      "peer": true
+      "integrity": "sha1-IQmtx5ZYh8/AXLvUQsrIv7s2CGM="
     },
     "object-copy": {
       "version": "0.1.0",
@@ -12763,6 +12891,12 @@
       "resolved": "https://registry.npmjs.org/object-hash/-/object-hash-1.3.1.tgz",
       "integrity": "sha512-OSuu/pU4ENM9kmREg0BdNrUDIl1heYa4mBZacJc+vVWz4GtAwu7jO8s4AIt2aGRUTqxykpWzI3Oqnsm13tTMDA=="
     },
+    "object-inspect": {
+      "version": "1.12.3",
+      "resolved": "https://registry.npmjs.org/object-inspect/-/object-inspect-1.12.3.tgz",
+      "integrity": "sha512-geUvdk7c+eizMNUDkRpW1wJwgfOiOeHbxBR/hLXK1aT6zmVSO0jsQcs7fj6MGw89jC/cjGfLcNOrtMYtGqm81g==",
+      "dev": true
+    },
     "object-visit": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/object-visit/-/object-visit-1.0.1.tgz",
@@ -12869,8 +13003,7 @@
     "path-is-absolute": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/path-is-absolute/-/path-is-absolute-1.0.1.tgz",
-      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18=",
-      "dev": true
+      "integrity": "sha1-F0uSaHNVNP+8es5r9TpanhtcX18="
     },
     "path-key": {
       "version": "2.0.1",
@@ -13337,7 +13470,6 @@
       "version": "3.0.2",
       "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
       "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
-      "dev": true,
       "requires": {
         "glob": "^7.1.3"
       },
@@ -13346,7 +13478,6 @@
           "version": "7.2.3",
           "resolved": "https://registry.npmjs.org/glob/-/glob-7.2.3.tgz",
           "integrity": "sha512-nFR0zLpU2YCaRxwoCJvL6UvCH2JFyFVIvwTLsIf21AuHlMskA1hhTdk+LlYJtOlYt9v6dvszD2BGRqBL+iQK9Q==",
-          "dev": true,
           "requires": {
             "fs.realpath": "^1.0.0",
             "inflight": "^1.0.4",
@@ -13580,8 +13711,7 @@
     "set-blocking": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
-      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc=",
-      "dev": true
+      "integrity": "sha1-BF+XgtARrppoA93TgrJDkrPYkPc="
     },
     "set-value": {
       "version": "2.0.1",
@@ -13633,27 +13763,31 @@
       "dev": true,
       "optional": true
     },
+    "side-channel": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.0.4.tgz",
+      "integrity": "sha512-q5XPytqFEIKHkGdiMIrY10mvLRvnQh42/+GoBlFW3b2LXLE2xxJpZFdm94we0BaoV3RwJyGqg5wS7epxTv0Zvw==",
+      "dev": true,
+      "requires": {
+        "call-bind": "^1.0.0",
+        "get-intrinsic": "^1.0.2",
+        "object-inspect": "^1.9.0"
+      }
+    },
     "signal-exit": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.3.tgz",
-      "integrity": "sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA==",
-      "dev": true
+      "integrity": "sha512-VUJ49FC8U1OxwZLxIbTTrDvLnf/6TDgxZcK8wxR8zs13xpx7xbG60ndBlhNrFi2EMuFRoeDoJO7wthSLq42EjA=="
     },
     "simple-concat": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.1.tgz",
-      "integrity": "sha512-cSFtAPtRhljv69IK0hTVZQ+OfE9nePi/rtJmw5UjHeVyVroEqJXP1sFztKUy1qU+xvz3u/sfYJLa947b7nAN2Q==",
-      "dev": true,
-      "optional": true,
-      "peer": true
+      "integrity": "sha512-cSFtAPtRhljv69IK0hTVZQ+OfE9nePi/rtJmw5UjHeVyVroEqJXP1sFztKUy1qU+xvz3u/sfYJLa947b7nAN2Q=="
     },
     "simple-get": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/simple-get/-/simple-get-3.1.1.tgz",
       "integrity": "sha512-CQ5LTKGfCpvE1K0n2us+kuMPbk/q0EKl82s4aheV9oXjFEz6W/Y7oQFVJuU6QG77hRT4Ghb5RURteF5vnWjupA==",
-      "dev": true,
-      "optional": true,
-      "peer": true,
       "requires": {
         "decompress-response": "^4.2.0",
         "once": "^1.3.1",
@@ -13664,9 +13798,6 @@
           "version": "4.2.1",
           "resolved": "https://registry.npmjs.org/decompress-response/-/decompress-response-4.2.1.tgz",
           "integrity": "sha512-jOSne2qbyE+/r8G1VU+G/82LBs2Fs4LAsTiLSHOCOMZQl2OKZ6i8i4IyHemTe+/yIXOtTcRQMzPcgyhoFlqPkw==",
-          "dev": true,
-          "optional": true,
-          "peer": true,
           "requires": {
             "mimic-response": "^2.0.0"
           }
@@ -13674,10 +13805,7 @@
         "mimic-response": {
           "version": "2.1.0",
           "resolved": "https://registry.npmjs.org/mimic-response/-/mimic-response-2.1.0.tgz",
-          "integrity": "sha512-wXqjST+SLt7R009ySCglWBCFpjUygmCIfD790/kVbiGmUgfYGuB14PiTd5DwVxSV4NcYHjzMkoj5LjQZwTQLEA==",
-          "dev": true,
-          "optional": true,
-          "peer": true
+          "integrity": "sha512-wXqjST+SLt7R009ySCglWBCFpjUygmCIfD790/kVbiGmUgfYGuB14PiTd5DwVxSV4NcYHjzMkoj5LjQZwTQLEA=="
         }
       }
     },
@@ -14049,6 +14177,95 @@
       "integrity": "sha512-BrpvfNAE3dcvq7ll3xVumzjKjZQ5tI1sEUIKr3Uoks0XUl45St3FlatVqef9prk4jRDzhW6WZg+3bk93y6pLjA==",
       "dev": true
     },
+    "superagent": {
+      "version": "8.0.9",
+      "resolved": "https://registry.npmjs.org/superagent/-/superagent-8.0.9.tgz",
+      "integrity": "sha512-4C7Bh5pyHTvU33KpZgwrNKh/VQnvgtCSqPRfJAUdmrtSYePVzVg4E4OzsrbkhJj9O7SO6Bnv75K/F8XVZT8YHA==",
+      "dev": true,
+      "requires": {
+        "component-emitter": "^1.3.0",
+        "cookiejar": "^2.1.4",
+        "debug": "^4.3.4",
+        "fast-safe-stringify": "^2.1.1",
+        "form-data": "^4.0.0",
+        "formidable": "^2.1.2",
+        "methods": "^1.1.2",
+        "mime": "2.6.0",
+        "qs": "^6.11.0",
+        "semver": "^7.3.8"
+      },
+      "dependencies": {
+        "combined-stream": {
+          "version": "1.0.8",
+          "resolved": "https://registry.npmjs.org/combined-stream/-/combined-stream-1.0.8.tgz",
+          "integrity": "sha512-FQN4MRfuJeHf7cBbBMJFXhKSDq+2kAArBlmRBvcvFE5BB1HZKXtSFASDhdlz9zOYwxh8lDdnvmMOe/+5cdoEdg==",
+          "dev": true,
+          "requires": {
+            "delayed-stream": "~1.0.0"
+          }
+        },
+        "debug": {
+          "version": "4.3.4",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.4.tgz",
+          "integrity": "sha512-PRWFHuSU3eDtQJPvnNY7Jcket1j0t5OuOsFzPPzsekD52Zl8qUfFIPEiswXqIvHWGVHOgX+7G/vCNNhehwxfkQ==",
+          "dev": true,
+          "requires": {
+            "ms": "2.1.2"
+          }
+        },
+        "form-data": {
+          "version": "4.0.0",
+          "resolved": "https://registry.npmjs.org/form-data/-/form-data-4.0.0.tgz",
+          "integrity": "sha512-ETEklSGi5t0QMZuiXoA/Q6vcnxcLQP5vdugSpuAyi6SVGi2clPPp+xgEhuMaHC+zGgn31Kd235W35f7Hykkaww==",
+          "dev": true,
+          "requires": {
+            "asynckit": "^0.4.0",
+            "combined-stream": "^1.0.8",
+            "mime-types": "^2.1.12"
+          }
+        },
+        "mime": {
+          "version": "2.6.0",
+          "resolved": "https://registry.npmjs.org/mime/-/mime-2.6.0.tgz",
+          "integrity": "sha512-USPkMeET31rOMiarsBNIHZKLGgvKc/LrjofAnBlOttf5ajRvqiRA8QsenbcooctK6d6Ts6aqZXBA+XbkKthiQg==",
+          "dev": true
+        },
+        "ms": {
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
+        "qs": {
+          "version": "6.11.0",
+          "resolved": "https://registry.npmjs.org/qs/-/qs-6.11.0.tgz",
+          "integrity": "sha512-MvjoMCJwEarSbUYk5O+nmoSzSutSsTwF85zcHPQ9OrlFoZOYIjaqBAJIqIXjptyD5vThxGq52Xu/MaJzRkIk4Q==",
+          "dev": true,
+          "requires": {
+            "side-channel": "^1.0.4"
+          }
+        },
+        "semver": {
+          "version": "7.3.8",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-7.3.8.tgz",
+          "integrity": "sha512-NB1ctGL5rlHrPJtFDVIVzTyQylMLu9N9VICA6HSFJo8MCGVTMW6gfpicwKmmK/dAjTOrqu5l63JJOpDSrAis3A==",
+          "dev": true,
+          "requires": {
+            "lru-cache": "^6.0.0"
+          }
+        }
+      }
+    },
+    "supertest": {
+      "version": "6.3.3",
+      "resolved": "https://registry.npmjs.org/supertest/-/supertest-6.3.3.tgz",
+      "integrity": "sha512-EMCG6G8gDu5qEqRQ3JjjPs6+FYT1a7Hv5ApHvtSghmOFJYtsU5S+pSb6Y2EUeCEY3CmEL3mmQ8YWlPOzQomabA==",
+      "dev": true,
+      "requires": {
+        "methods": "^1.1.2",
+        "superagent": "^8.0.5"
+      }
+    },
     "supports-color": {
       "version": "7.2.0",
       "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
@@ -14078,9 +14295,6 @@
       "version": "6.1.11",
       "resolved": "https://registry.npmjs.org/tar/-/tar-6.1.11.tgz",
       "integrity": "sha512-an/KZQzQUkZCkuoAA64hM92X0Urb6VpRhAFllDzz44U2mcD5scmT3zBc4VgVpkugF580+DQn8eAFSyoQt0tznA==",
-      "dev": true,
-      "optional": true,
-      "peer": true,
       "requires": {
         "chownr": "^2.0.0",
         "fs-minipass": "^2.0.0",
@@ -14561,9 +14775,6 @@
       "version": "1.1.5",
       "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.5.tgz",
       "integrity": "sha512-eDMORYaPNZ4sQIuuYPDHdQvf4gyCF9rEEV/yPxGfwPkRodwEgiMUUXTx/dex+Me0wxx53S+NgUHaP7y3MGlDmg==",
-      "dev": true,
-      "optional": true,
-      "peer": true,
       "requires": {
         "string-width": "^1.0.2 || 2 || 3 || 4"
       }
@@ -14714,8 +14925,7 @@
     "yallist": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
-      "dev": true
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
     },
     "yargs": {
       "version": "16.2.0",
diff --git a/package.json b/package.json
index 09987c5..6642e73 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
     "bufferutil": "^4.0.2",
     "jest": "^26.6.0",
     "nodemon": "^2.0.6",
+    "supertest": "^6.3.3",
     "ts-node": "^9.1.0",
     "typescript": "^4.1.2",
     "utf-8-validate": "^5.0.3"
diff --git a/src/core/biovalidator-core.js b/src/core/biovalidator-core.js
index 3aafff5..6238da6 100644
--- a/src/core/biovalidator-core.js
+++ b/src/core/biovalidator-core.js
@@ -51,7 +51,10 @@ class BioValidator {
     }
 
     getCachedSchema() {
-        this.ajvInstance.getSchema("");
+        return {
+            "cachedSchema": Object.keys(this.validatorCache),
+            "referencedSchema": Object.keys(this.referencedSchemaCache)
+        };
     }
 
     clearCachedSchema() {
diff --git a/src/core/server.js b/src/core/server.js
index bfe7249..c55c194 100644
--- a/src/core/server.js
+++ b/src/core/server.js
@@ -101,10 +101,8 @@ class BioValidatorServer {
     });
 
     this.router.get("/cache", (req, res) => {
-      let cachedSchema = this.biovalidator.getCachedSchema(); // todo fill in the logic to get cached schema
-      res.send({
-        "message": "This endpoint is not implemented yet"
-      });
+      let cachedSchema = this.biovalidator.getCachedSchema();
+      res.send(cachedSchema);
     });
 
     this.router.delete("/cache", (req, res) => {
@@ -118,7 +116,7 @@ class BioValidatorServer {
   }
 
   _startServer() {
-    this.app.listen(this.port, () => {
+    this.expressServer = this.app.listen(this.port, () => {
       logger.info(`---------------------------------------------`);
       logger.info(`------------ ELIXIR biovalidator ------------`);
       logger.info(`---------------------------------------------`);
diff --git a/src/keywords/graphRestriction.js b/src/keywords/graphRestriction.js
index 037c838..fc72175 100644
--- a/src/keywords/graphRestriction.js
+++ b/src/keywords/graphRestriction.js
@@ -87,6 +87,7 @@ class GraphRestriction {
                             let olsResponsePromise;
                             if(cachedOlsResponses[url]) {
                                 olsResponsePromise = Promise.resolve(cachedOlsResponses[url]);
+                                logger.debug("Returning cached response for OLS request: " + url)
                             }
                             else {
                                 olsResponsePromise = request({
diff --git a/test/biovalidatorServer.test.js b/test/biovalidatorServer.test.js
new file mode 100644
index 0000000..bd0e274
--- /dev/null
+++ b/test/biovalidatorServer.test.js
@@ -0,0 +1,59 @@
+const fs = require("fs");
+const npid = require("npid");
+
+const BioValidatorServer = require('../src/core/server');
+const supertest = require('supertest');
+const server = new BioValidatorServer("3020", "");
+server.start()
+const requestWithSupertest = supertest(server.app);
+
+describe('biovalidator server endpoints', () => {
+  afterAll(done => {
+    server.expressServer.close();
+    npid.remove(server.pidPath);
+    done();
+  });
+
+  it('GET /cache should initially return empty cache', async () => {
+    const res = await requestWithSupertest.get('/cache');
+    expect(res.status).toEqual(200);
+    expect(res.type).toEqual(expect.stringContaining('json'));
+    expect(res.body).toHaveProperty('cachedSchema');
+    expect(res.body).toEqual({"cachedSchema": [], "referencedSchema": []})
+  });
+
+  it('GET /cache contains object after one hit', async () => {
+
+    let inputSchema = JSON.parse(fs.readFileSync("examples/schemas/biosamples-schema.json", "utf-8"));
+    let inputData = JSON.parse(fs.readFileSync("examples/objects/faang-organism-sample.json", "utf-8"));
+
+    let res = await requestWithSupertest.post('/validate')
+        .send({
+          "schema": inputSchema,
+          "data": inputData
+        });
+
+    expect(res.status).toEqual(200);
+    expect(res.type).toEqual(expect.stringContaining('json'));
+    expect(res.body).toEqual([])
+
+
+    res = await requestWithSupertest.get('/cache');
+    expect(res.status).toEqual(200);
+    expect(res.type).toEqual(expect.stringContaining('json'));
+    expect(res.body).toHaveProperty('cachedSchema');
+    expect(res.body).toEqual({"cachedSchema": ["test/biosamples/schema"], "referencedSchema": []})
+  });
+
+  it('GET /cache should be empty after cache clear', async () => {
+    let res = await requestWithSupertest.delete('/cache');
+    expect(res.status).toEqual(200);
+
+    res = await requestWithSupertest.get('/cache');
+    expect(res.status).toEqual(200);
+    expect(res.type).toEqual(expect.stringContaining('json'));
+    expect(res.body).toHaveProperty('cachedSchema');
+    expect(res.body).toEqual({"cachedSchema": [], "referencedSchema": []})
+  });
+
+});