diff --git a/package-lock.json b/package-lock.json
index 9297a5d629..3eac0f3988 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,18 +9,22 @@
       "version": "1.21.1",
       "license": "GPL-3.0-only",
       "dependencies": {
+        "@koa/multer": "^3.0.0",
+        "@koa/router": "^10.1.1",
         "big-integer": "1.6.48",
         "browser-hrtime": "^1.1.8",
         "chalk": "^4.1.1",
         "commander": "7.2.0",
-        "express": "^4.17.1",
         "form-data": "4.0.0",
         "https-proxy-agent": "5.0.0",
         "inquirer": "8.0.0",
         "jsdom": "^16.5.3",
+        "koa": "^2.13.4",
+        "koa-bodyparser": "^4.3.0",
+        "koa-json": "^2.0.2",
         "lowdb": "1.0.0",
         "lunr": "^2.3.9",
-        "multer": "^1.4.3",
+        "multer": "^1.4.4",
         "node-fetch": "^2.6.1",
         "node-forge": "0.10.0",
         "open": "^8.0.8",
@@ -35,13 +39,16 @@
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-        "@types/express": "^4.17.13",
         "@types/inquirer": "^7.3.1",
         "@types/jasmine": "^3.7.0",
         "@types/jsdom": "^16.2.10",
+        "@types/koa": "^2.13.4",
+        "@types/koa__multer": "^2.0.4",
+        "@types/koa__router": "^8.0.11",
+        "@types/koa-bodyparser": "^4.3.5",
+        "@types/koa-json": "^2.0.20",
         "@types/lowdb": "^1.0.10",
         "@types/lunr": "^2.3.3",
-        "@types/multer": "^1.4.7",
         "@types/node": "^16.11.12",
         "@types/node-fetch": "^2.5.10",
         "@types/node-forge": "^0.9.7",
@@ -243,6 +250,37 @@
         "url": "https://opencollective.com/substitute-js#section-contribute"
       }
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+    "node_modules/@koa/multer": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/@koa/multer/-/multer-3.0.0.tgz",
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+      "engines": {
+        "node": ">= 8"
+      },
+      "peerDependencies": {
+        "multer": "*"
+      }
+    },
+    "node_modules/@koa/router": {
+      "version": "10.1.1",
+      "resolved": "https://registry.npmjs.org/@koa/router/-/router-10.1.1.tgz",
+      "integrity": "sha512-ORNjq5z4EmQPriKbR0ER3k4Gh7YGNhWDL7JBW+8wXDrHLbWYKYSJaOJ9aN06npF5tbTxe2JBOsurpJDAvjiXKw==",
+      "dependencies": {
+        "debug": "^4.1.1",
+        "http-errors": "^1.7.3",
+        "koa-compose": "^4.1.0",
+        "methods": "^1.1.2",
+        "path-to-regexp": "^6.1.0"
+      },
+      "engines": {
+        "node": ">= 8.0.0"
+      }
+    },
+    "node_modules/@koa/router/node_modules/path-to-regexp": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/path-to-regexp/-/path-to-regexp-6.2.0.tgz",
+      "integrity": "sha512-f66KywYG6+43afgE/8j/GoiNyygk/bnoCbps++3ErRKsIYkGGupyv07R2Ok5m9i67Iqc+T2g1eAUGUPzWhYTyg=="
+    },
     "node_modules/@nodelib/fs.scandir": {
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       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -310,6 +348,15 @@
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       "dev": true
     },
+    "node_modules/@types/accepts": {
+      "version": "1.3.5",
+      "resolved": "https://registry.npmjs.org/@types/accepts/-/accepts-1.3.5.tgz",
+      "integrity": "sha512-jOdnI/3qTpHABjM5cx1Hc0sKsPoYCp+DP/GJRGtDlPd7fiV9oXGGIcjW/ZOxLIvjGz8MA+uMZI9metHlgqbgwQ==",
+      "dev": true,
+      "dependencies": {
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+      }
+    },
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@@ -329,6 +376,24 @@
         "@types/node": "*"
       }
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+    "node_modules/@types/content-disposition": {
+      "version": "0.5.4",
+      "resolved": "https://registry.npmjs.org/@types/content-disposition/-/content-disposition-0.5.4.tgz",
+      "integrity": "sha512-0mPF08jn9zYI0n0Q/Pnz7C4kThdSt+6LD4amsrYDDpgBfrVWa3TcCOxKX1zkGgYniGagRv8heN2cbh+CAn+uuQ==",
+      "dev": true
+    },
+    "node_modules/@types/cookies": {
+      "version": "0.7.7",
+      "resolved": "https://registry.npmjs.org/@types/cookies/-/cookies-0.7.7.tgz",
+      "integrity": "sha512-h7BcvPUogWbKCzBR2lY4oqaZbO3jXZksexYJVFvkrFeLgbZjQkU4x8pRq6eg2MHXQhY0McQdqmmsxRWlVAHooA==",
+      "dev": true,
+      "dependencies": {
+        "@types/connect": "*",
+        "@types/express": "*",
+        "@types/keygrip": "*",
+        "@types/node": "*"
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     "node_modules/@types/eslint": {
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       "resolved": "https://registry.npmjs.org/@types/eslint/-/eslint-8.2.1.tgz",
@@ -388,6 +453,18 @@
         "@types/node": "*"
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+      "version": "1.5.3",
+      "resolved": "https://registry.npmjs.org/@types/http-assert/-/http-assert-1.5.3.tgz",
+      "integrity": "sha512-FyAOrDuQmBi8/or3ns4rwPno7/9tJTijVW6aQQjK02+kOQ8zmoNg2XJtAuQhvQcy1ASJq38wirX5//9J1EqoUA==",
+      "dev": true
+    },
+    "node_modules/@types/http-errors": {
+      "version": "1.8.2",
+      "resolved": "https://registry.npmjs.org/@types/http-errors/-/http-errors-1.8.2.tgz",
+      "integrity": "sha512-EqX+YQxINb+MeXaIqYDASb6U6FCHbWjkj4a1CKDBks3d/QiB2+PqBLyO72vLDgAO1wUI4O+9gweRcQK11bTL/w==",
+      "dev": true
+    },
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@@ -427,6 +504,73 @@
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+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/@types/keygrip/-/keygrip-1.0.2.tgz",
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+      "dev": true
+    },
+    "node_modules/@types/koa": {
+      "version": "2.13.4",
+      "resolved": "https://registry.npmjs.org/@types/koa/-/koa-2.13.4.tgz",
+      "integrity": "sha512-dfHYMfU+z/vKtQB7NUrthdAEiSvnLebvBjwHtfFmpZmB7em2N3WVQdHgnFq+xvyVgxW5jKDmjWfLD3lw4g4uTw==",
+      "dev": true,
+      "dependencies": {
+        "@types/accepts": "*",
+        "@types/content-disposition": "*",
+        "@types/cookies": "*",
+        "@types/http-assert": "*",
+        "@types/http-errors": "*",
+        "@types/keygrip": "*",
+        "@types/koa-compose": "*",
+        "@types/node": "*"
+      }
+    },
+    "node_modules/@types/koa__multer": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/@types/koa__multer/-/koa__multer-2.0.4.tgz",
+      "integrity": "sha512-WRkshXhE5rpYFUbbtAjyMhdOOSdbu1XX+2AQlRNM6AZtgxd0/WXMU4lrP7e9tk5HWVTWbx8DOOsVBmfHjSGJ4w==",
+      "dev": true,
+      "dependencies": {
+        "@types/koa": "*"
+      }
+    },
+    "node_modules/@types/koa__router": {
+      "version": "8.0.11",
+      "resolved": "https://registry.npmjs.org/@types/koa__router/-/koa__router-8.0.11.tgz",
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+      "dev": true,
+      "dependencies": {
+        "@types/koa": "*"
+      }
+    },
+    "node_modules/@types/koa-bodyparser": {
+      "version": "4.3.5",
+      "resolved": "https://registry.npmjs.org/@types/koa-bodyparser/-/koa-bodyparser-4.3.5.tgz",
+      "integrity": "sha512-NRqqoTtt7cfdDk/KNo+EwCIKRuzPAu/wsaZ7tgIvSIBtNfxuZHYueaLoWdxX3ZftWavQv07NE46TcpyoZGqpgQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/koa": "*"
+      }
+    },
+    "node_modules/@types/koa-compose": {
+      "version": "3.2.5",
+      "resolved": "https://registry.npmjs.org/@types/koa-compose/-/koa-compose-3.2.5.tgz",
+      "integrity": "sha512-B8nG/OoE1ORZqCkBVsup/AKcvjdgoHnfi4pZMn5UwAPCbhk/96xyv284eBYW8JlQbQ7zDmnpFr68I/40mFoIBQ==",
+      "dev": true,
+      "dependencies": {
+        "@types/koa": "*"
+      }
+    },
+    "node_modules/@types/koa-json": {
+      "version": "2.0.20",
+      "resolved": "https://registry.npmjs.org/@types/koa-json/-/koa-json-2.0.20.tgz",
+      "integrity": "sha512-RuQ1Vlpsm/EC5wo2oWCgNnwneixnSQ9aHQAE7nwnbSiCibgfUO2wwSQN6rn8SfF97cRdN9hKAtoc9KSIuiGP6Q==",
+      "dev": true,
+      "dependencies": {
+        "@types/koa": "*"
+      }
+    },
     "node_modules/@types/lodash": {
       "version": "4.14.170",
       "resolved": "https://registry.npmjs.org/@types/lodash/-/lodash-4.14.170.tgz",
@@ -460,15 +604,6 @@
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-    "node_modules/@types/multer": {
-      "version": "1.4.7",
-      "resolved": "https://registry.npmjs.org/@types/multer/-/multer-1.4.7.tgz",
-      "integrity": "sha512-/SNsDidUFCvqqcWDwxv2feww/yqhNeTRL5CVoL3jU4Goc4kKEL10T7Eye65ZqPNi4HRx8sAEX59pV1aEH7drNA==",
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-      "dependencies": {
-        "@types/express": "*"
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       "resolved": "https://registry.npmjs.org/@types/node/-/node-16.11.12.tgz",
@@ -1017,11 +1152,6 @@
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-      "resolved": "https://registry.npmjs.org/array-flatten/-/array-flatten-1.1.1.tgz",
-      "integrity": "sha1-ml9pkFGx5wczKPKgCJaLZOopVdI="
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@@ -1129,39 +1259,6 @@
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-        "content-type": "~1.0.4",
-        "debug": "2.6.9",
-        "depd": "~1.1.2",
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@@ -1296,6 +1393,18 @@
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       }
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+    "node_modules/cache-content-type": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/cache-content-type/-/cache-content-type-1.0.1.tgz",
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+      "dependencies": {
+        "mime-types": "^2.1.18",
+        "ylru": "^1.2.0"
+      },
+      "engines": {
+        "node": ">= 6.0.0"
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@@ -1481,6 +1590,26 @@
         "node": ">=6"
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+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/co/-/co-4.6.0.tgz",
+      "integrity": "sha1-bqa989hTrlTMuOR7+gvz+QMfsYQ=",
+      "engines": {
+        "iojs": ">= 1.0.0",
+        "node": ">= 0.12.0"
+      }
+    },
+    "node_modules/co-body": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/co-body/-/co-body-6.1.0.tgz",
+      "integrity": "sha512-m7pOT6CdLN7FuXUcpuz/8lfQ/L77x8SchHCF4G0RBTJO20Wzmhn5Sp4/5WsKy8OSpifBSUrmg83qEqaDHdyFuQ==",
+      "dependencies": {
+        "inflation": "^2.0.0",
+        "qs": "^6.5.2",
+        "raw-body": "^2.3.3",
+        "type-is": "^1.6.16"
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@@ -1603,18 +1732,30 @@
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-      "resolved": "https://registry.npmjs.org/cookie/-/cookie-0.4.1.tgz",
-      "integrity": "sha512-ZwrFkGJxUR3EIoXtO+yVE69Eb7KlixbaeAWfBQB9vVsNn/o+Yw69gBWSSDK825hQNdN+wF8zELf3dFNl/kxkUA==",
+    "node_modules/cookies": {
+      "version": "0.8.0",
+      "resolved": "https://registry.npmjs.org/cookies/-/cookies-0.8.0.tgz",
+      "integrity": "sha512-8aPsApQfebXnuI+537McwYsDtjVxGm8gTIzQI3FDW6t5t/DAhERxtnbEPN/8RX+uZthoz4eCOgloXaE5cYyNow==",
+      "dependencies": {
+        "depd": "~2.0.0",
+        "keygrip": "~1.1.0"
+      },
       "engines": {
-        "node": ">= 0.6"
+        "node": ">= 0.8"
       }
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-    "node_modules/cookie-signature": {
-      "version": "1.0.6",
-      "resolved": "https://registry.npmjs.org/cookie-signature/-/cookie-signature-1.0.6.tgz",
-      "integrity": "sha1-4wOogrNCzD7oylE6eZmXNNqzriw="
+    "node_modules/cookies/node_modules/depd": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/depd/-/depd-2.0.0.tgz",
+      "integrity": "sha512-g7nH6P6dyDioJogAAGprGpCtVImJhpPk/roCzdb3fIh61/s/nPsfR6onyMwkCAR/OlC3yBC0lESvUoQEAssIrw==",
+      "engines": {
+        "node": ">= 0.8"
+      }
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+    "node_modules/copy-to": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/copy-to/-/copy-to-2.0.1.tgz",
+      "integrity": "sha1-JoD7uAaKSNCGVrYJgJK9r8kG9KU="
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@@ -1815,6 +1956,11 @@
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+    "node_modules/deep-equal": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/deep-equal/-/deep-equal-1.0.1.tgz",
+      "integrity": "sha1-9dJgKStmDghO/0zbyfCK0yR0SLU="
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@@ -1924,8 +2070,7 @@
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-      "dev": true
+      "integrity": "sha1-hMbhWbgZBP3KWaDvRM2HDTElD5o="
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@@ -2225,14 +2370,6 @@
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@@ -2274,59 +2411,6 @@
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-      "integrity": "sha512-oxlxJxcQlYwqPWKVJJtvQiwHgosH/LrLSPA+H4UxpyvSS6jC5aH+5MoHFM+KABgTOt0APue4w66Ha8jCUo9QGg==",
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+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/streaming-json-stringify/-/streaming-json-stringify-3.1.0.tgz",
+      "integrity": "sha1-gCAEN6mTzDnE/gAmO3s7kDrIevU=",
+      "requires": {
+        "json-stringify-safe": "5",
+        "readable-stream": "2"
+      },
+      "dependencies": {
+        "readable-stream": {
+          "version": "2.3.7",
+          "resolved": "https://registry.npmjs.org/readable-stream/-/readable-stream-2.3.7.tgz",
+          "integrity": "sha512-Ebho8K4jIbHAxnuxi7o42OrZgF/ZTNcsZj6nRKyUmkhLFq8CHItp/fy6hQZuZmP/n3yZ9VBUbp4zz/mX8hmYPw==",
+          "requires": {
+            "core-util-is": "~1.0.0",
+            "inherits": "~2.0.3",
+            "isarray": "~1.0.0",
+            "process-nextick-args": "~2.0.0",
+            "safe-buffer": "~5.1.1",
+            "string_decoder": "~1.1.1",
+            "util-deprecate": "~1.0.1"
+          }
+        },
+        "safe-buffer": {
+          "version": "5.1.2",
+          "resolved": "https://registry.npmjs.org/safe-buffer/-/safe-buffer-5.1.2.tgz",
+          "integrity": "sha512-Gd2UZBJDkXlY7GbJxfsE8/nvKkUEU1G38c1siN6QP6a9PT9MmHB8GnpscSmMJSoF8LOIrt8ud/wPtojys4G6+g=="
+        },
+        "string_decoder": {
+          "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": {
+            "safe-buffer": "~5.1.0"
+          }
+        }
+      }
+    },
     "streamsearch": {
       "version": "0.1.2",
       "resolved": "https://registry.npmjs.org/streamsearch/-/streamsearch-0.1.2.tgz",
@@ -10685,6 +10947,11 @@
         }
       }
     },
+    "tsscmp": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/tsscmp/-/tsscmp-1.0.6.tgz",
+      "integrity": "sha512-LxhtAkPDTkVCMQjt2h6eBVY28KCjikZqZfMcC15YBeNjkgUpdCfBu5HoiOTDu86v6smE8yOjyEktJ8hlbANHQA=="
+    },
     "tsutils": {
       "version": "2.29.0",
       "resolved": "https://registry.npmjs.org/tsutils/-/tsutils-2.29.0.tgz",
@@ -10783,11 +11050,6 @@
       "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
     },
-    "utils-merge": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
-      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM="
-    },
     "vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
@@ -11081,6 +11343,11 @@
       "integrity": "sha512-y11nGElTIV+CT3Zv9t7VKl+Q3hTQoT9a1Qzezhhl6Rp21gJ/IVTW7Z3y9EWXhuUBC2Shnf+DX0antecpAwSP8w==",
       "dev": true
     },
+    "ylru": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/ylru/-/ylru-1.2.1.tgz",
+      "integrity": "sha512-faQrqNMzcPCHGVC2aaOINk13K+aaBDUPjGWl0teOXywElLjyVAB6Oe2jj62jHYtwsU49jXhScYbvPENK+6zAvQ=="
+    },
     "yn": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yn/-/yn-3.1.1.tgz",
diff --git a/package.json b/package.json
index df20da75db..c70d66ba07 100644
--- a/package.json
+++ b/package.json
@@ -54,13 +54,16 @@
   },
   "devDependencies": {
     "@fluffy-spoon/substitute": "^1.208.0",
-    "@types/express": "^4.17.13",
     "@types/inquirer": "^7.3.1",
     "@types/jasmine": "^3.7.0",
     "@types/jsdom": "^16.2.10",
+    "@types/koa": "^2.13.4",
+    "@types/koa__multer": "^2.0.4",
+    "@types/koa__router": "^8.0.11",
+    "@types/koa-bodyparser": "^4.3.5",
+    "@types/koa-json": "^2.0.20",
     "@types/lowdb": "^1.0.10",
     "@types/lunr": "^2.3.3",
-    "@types/multer": "^1.4.7",
     "@types/node": "^16.11.12",
     "@types/node-fetch": "^2.5.10",
     "@types/node-forge": "^0.9.7",
@@ -93,18 +96,22 @@
     "webpack-node-externals": "^3.0.0"
   },
   "dependencies": {
+    "@koa/multer": "^3.0.0",
+    "@koa/router": "^10.1.1",
     "big-integer": "1.6.48",
     "browser-hrtime": "^1.1.8",
     "chalk": "^4.1.1",
     "commander": "7.2.0",
-    "express": "^4.17.1",
     "form-data": "4.0.0",
     "https-proxy-agent": "5.0.0",
     "inquirer": "8.0.0",
     "jsdom": "^16.5.3",
+    "koa": "^2.13.4",
+    "koa-bodyparser": "^4.3.0",
+    "koa-json": "^2.0.2",
     "lowdb": "1.0.0",
     "lunr": "^2.3.9",
-    "multer": "^1.4.3",
+    "multer": "^1.4.4",
     "node-fetch": "^2.6.1",
     "node-forge": "0.10.0",
     "open": "^8.0.8",
diff --git a/src/commands/serve.command.ts b/src/commands/serve.command.ts
index 93c4e31f75..8c8857e347 100644
--- a/src/commands/serve.command.ts
+++ b/src/commands/serve.command.ts
@@ -1,6 +1,9 @@
+import * as koaMulter from "@koa/multer";
+import * as koaRouter from "@koa/router";
 import * as program from "commander";
-import * as express from "express";
-import * as multer from "multer";
+import * as koa from "koa";
+import * as koaBodyParser from "koa-bodyparser";
+import * as koaJson from "koa-json";
 
 import { Main } from "../bw";
 
@@ -28,6 +31,8 @@ import { SendRemovePasswordCommand } from "./send/removePassword.command";
 import { Response } from "jslib-node/cli/models/response";
 import { FileResponse } from "jslib-node/cli/models/response/fileResponse";
 
+import { KeySuffixOptions } from "jslib-common/enums/keySuffixOptions";
+
 export class ServeCommand {
   private listCommand: ListCommand;
   private getCommand: GetCommand;
@@ -144,158 +149,247 @@ export class ServeCommand {
 
   async run(options: program.OptionValues) {
     const port = options.port || 8087;
-    const server = express();
+    const server = new koa();
+    const router = new koaRouter();
     process.env.BW_SERVE = "true";
     process.env.BW_NOINTERACTION = "true";
 
-    server.use(express.json());
-    server.use((req, res, next) => {
-      const sessionHeader = req.get("Session");
-      if (sessionHeader != null && sessionHeader !== "") {
-        process.env.BW_SESSION = sessionHeader;
-      }
-      next();
+    server.use(koaBodyParser()).use(koaJson({ pretty: false, param: "pretty" }));
+
+    router.get("/generate", async (ctx, next) => {
+      const response = await this.generateCommand.run(ctx.request.query);
+      this.processResponse(ctx.response, response);
+      await next();
     });
 
-    server.get("/generate", async (req, res) => {
-      const response = await this.generateCommand.run(req.query);
-      this.processResponse(res, response);
-    });
-
-    server.get("/status", async (req, res) => {
+    router.get("/status", async (ctx, next) => {
       const response = await this.statusCommand.run();
-      this.processResponse(res, response);
+      this.processResponse(ctx.response, response);
+      await next();
     });
 
-    server.get("/list/:object", async (req, res) => {
-      let response: Response = null;
-      if (req.params.object === "send") {
-        response = await this.sendListCommand.run(req.query);
-      } else {
-        response = await this.listCommand.run(req.params.object, req.query);
+    router.get("/list/object/:object", async (ctx, next) => {
+      if (await this.errorIfLocked(ctx.response)) {
+        await next();
+        return;
       }
-      this.processResponse(res, response);
+      let response: Response = null;
+      if (ctx.params.object === "send") {
+        response = await this.sendListCommand.run(ctx.request.query);
+      } else {
+        response = await this.listCommand.run(ctx.params.object, ctx.request.query);
+      }
+      this.processResponse(ctx.response, response);
+      await next();
     });
 
-    server.get("/send/list", async (req, res) => {
-      const response = await this.sendListCommand.run(req.query);
-      this.processResponse(res, response);
+    router.get("/send/list", async (ctx, next) => {
+      if (await this.errorIfLocked(ctx.response)) {
+        await next();
+        return;
+      }
+      const response = await this.sendListCommand.run(ctx.request.query);
+      this.processResponse(ctx.response, response);
+      await next();
     });
 
-    server.post("/sync", async (req, res) => {
-      const response = await this.syncCommand.run(req.query);
-      this.processResponse(res, response);
+    router.post("/sync", async (ctx, next) => {
+      const response = await this.syncCommand.run(ctx.request.query);
+      this.processResponse(ctx.response, response);
+      await next();
     });
 
-    server.post("/lock", async (req, res) => {
+    router.post("/lock", async (ctx, next) => {
       const response = await this.lockCommand.run();
-      this.processResponse(res, response);
+      this.processResponse(ctx.response, response);
+      await next();
     });
 
-    server.post("/unlock", async (req, res) => {
+    router.post("/unlock", async (ctx, next) => {
       const response = await this.unlockCommand.run(
-        req.body == null ? null : (req.body.password as string),
-        req.query
+        ctx.request.body.password == null ? null : (ctx.request.body.password as string),
+        ctx.request.query
       );
-      this.processResponse(res, response);
+      this.processResponse(ctx.response, response);
+      await next();
     });
 
-    server.post("/confirm/:object/:id", async (req, res) => {
-      const response = await this.confirmCommand.run(req.params.object, req.params.id, req.query);
-      this.processResponse(res, response);
-    });
-
-    server.post("/restore/:object/:id", async (req, res) => {
-      const response = await this.restoreCommand.run(req.params.object, req.params.id);
-      this.processResponse(res, response);
-    });
-
-    server.post("/move/:id/:organizationId", async (req, res) => {
-      const response = await this.shareCommand.run(
-        req.params.id,
-        req.params.organizationId,
-        req.body
-      );
-      this.processResponse(res, response);
-    });
-
-    server.post("/attachment", multer().single("file"), async (req, res) => {
-      const response = await this.createCommand.run("attachment", req.body, req.query, {
-        fileBuffer: req.file.buffer,
-        fileName: req.file.originalname,
-      });
-      this.processResponse(res, response);
-    });
-
-    server.post("/send/:id/remove-password", async (req, res) => {
-      const response = await this.sendRemovePasswordCommand.run(req.params.id);
-      this.processResponse(res, response);
-    });
-
-    server.post("/:object", async (req, res) => {
-      let response: Response = null;
-      if (req.params.object === "send") {
-        response = await this.sendCreateCommand.run(req.body, req.query);
-      } else {
-        response = await this.createCommand.run(req.params.object, req.body, req.query);
+    router.post("/confirm/:object/:id", async (ctx, next) => {
+      if (await this.errorIfLocked(ctx.response)) {
+        await next();
+        return;
       }
-      this.processResponse(res, response);
+      const response = await this.confirmCommand.run(
+        ctx.params.object,
+        ctx.params.id,
+        ctx.request.query
+      );
+      this.processResponse(ctx.response, response);
+      await next();
     });
 
-    server.put("/:object/:id", async (req, res) => {
+    router.post("/restore/:object/:id", async (ctx, next) => {
+      if (await this.errorIfLocked(ctx.response)) {
+        await next();
+        return;
+      }
+      const response = await this.restoreCommand.run(ctx.params.object, ctx.params.id);
+      this.processResponse(ctx.response, response);
+      await next();
+    });
+
+    router.post("/move/:id/:organizationId", async (ctx, next) => {
+      if (await this.errorIfLocked(ctx.response)) {
+        await next();
+        return;
+      }
+      const response = await this.shareCommand.run(
+        ctx.params.id,
+        ctx.params.organizationId,
+        ctx.request.body // TODO: Check the format of this body for an array of collection ids
+      );
+      this.processResponse(ctx.response, response);
+      await next();
+    });
+
+    router.post("/attachment", koaMulter().single("file"), async (ctx, next) => {
+      if (await this.errorIfLocked(ctx.response)) {
+        await next();
+        return;
+      }
+      const response = await this.createCommand.run(
+        "attachment",
+        ctx.request.body,
+        ctx.request.query,
+        {
+          fileBuffer: ctx.request.file.buffer,
+          fileName: ctx.request.file.originalname,
+        }
+      );
+      this.processResponse(ctx.response, response);
+      await next();
+    });
+
+    router.post("/send/:id/remove-password", async (ctx, next) => {
+      if (await this.errorIfLocked(ctx.response)) {
+        await next();
+        return;
+      }
+      const response = await this.sendRemovePasswordCommand.run(ctx.params.id);
+      this.processResponse(ctx.response, response);
+      await next();
+    });
+
+    router.post("/object/:object", async (ctx, next) => {
+      if (await this.errorIfLocked(ctx.response)) {
+        await next();
+        return;
+      }
       let response: Response = null;
-      if (req.params.object === "send") {
-        req.body.id = req.params.id;
-        response = await this.sendEditCommand.run(req.body, req.query);
+      if (ctx.params.object === "send") {
+        response = await this.sendCreateCommand.run(ctx.request.body, ctx.request.query);
       } else {
-        response = await this.editCommand.run(
-          req.params.object,
-          req.params.id,
-          req.body,
-          req.query
+        response = await this.createCommand.run(
+          ctx.params.object,
+          ctx.request.body,
+          ctx.request.query
         );
       }
-      this.processResponse(res, response);
+      this.processResponse(ctx.response, response);
+      await next();
     });
 
-    server.get("/:object/:id", async (req, res) => {
-      let response: Response = null;
-      if (req.params.object === "send") {
-        response = await this.sendGetCommand.run(req.params.id, null);
-      } else {
-        response = await this.getCommand.run(req.params.object, req.params.id, req.query);
+    router.put("/object/:object/:id", async (ctx, next) => {
+      if (await this.errorIfLocked(ctx.response)) {
+        await next();
+        return;
       }
-      this.processResponse(res, response);
-    });
-
-    server.delete("/:object/:id", async (req, res) => {
       let response: Response = null;
-      if (req.params.object === "send") {
-        response = await this.sendDeleteCommand.run(req.params.id);
+      if (ctx.params.object === "send") {
+        ctx.request.body.id = ctx.params.id;
+        response = await this.sendEditCommand.run(ctx.request.body, ctx.request.query);
       } else {
-        response = await this.deleteCommand.run(req.params.object, req.params.id, req.query);
+        response = await this.editCommand.run(
+          ctx.params.object,
+          ctx.params.id,
+          ctx.request.body,
+          ctx.request.query
+        );
       }
-      this.processResponse(res, response);
+      this.processResponse(ctx.response, response);
+      await next();
     });
 
-    server.listen(port, () => {
-      this.main.logService.info("Listening on port " + port);
+    router.get("/object/:object/:id", async (ctx, next) => {
+      if (await this.errorIfLocked(ctx.response)) {
+        await next();
+        return;
+      }
+      let response: Response = null;
+      if (ctx.params.object === "send") {
+        response = await this.sendGetCommand.run(ctx.params.id, null);
+      } else {
+        response = await this.getCommand.run(ctx.params.object, ctx.params.id, ctx.request.query);
+      }
+      this.processResponse(ctx.response, response);
+      await next();
     });
+
+    router.delete("/object/:object/:id", async (ctx, next) => {
+      if (await this.errorIfLocked(ctx.response)) {
+        await next();
+        return;
+      }
+      let response: Response = null;
+      if (ctx.params.object === "send") {
+        response = await this.sendDeleteCommand.run(ctx.params.id);
+      } else {
+        response = await this.deleteCommand.run(
+          ctx.params.object,
+          ctx.params.id,
+          ctx.request.query
+        );
+      }
+      this.processResponse(ctx.response, response);
+      await next();
+    });
+
+    server
+      .use(router.routes())
+      .use(router.allowedMethods())
+      .listen(port, () => {
+        this.main.logService.info("Listening on port " + port);
+      });
   }
 
-  private processResponse(res: any, commandResponse: Response) {
+  private processResponse(res: koa.Response, commandResponse: Response) {
     if (!commandResponse.success) {
-      res.statusCode = 400;
+      res.status = 400;
     }
     if (commandResponse.data instanceof FileResponse) {
-      res.writeHead(200, {
-        "Content-Type": "application/octet-stream",
-        "Content-Disposition": "attachment;filename=" + commandResponse.data.fileName,
-        "Content-Length": commandResponse.data.data.length,
-      });
-      res.end(commandResponse.data.data);
+      res.body = commandResponse.data.data;
+      res.attachment(commandResponse.data.fileName);
+      res.set("Content-Type", "application/octet-stream");
+      res.set("Content-Length", commandResponse.data.data.length.toString());
     } else {
-      res.json(commandResponse);
+      res.body = commandResponse;
     }
   }
+
+  private async errorIfLocked(res: koa.Response) {
+    const authed = await this.main.stateService.getIsAuthenticated();
+    if (!authed) {
+      this.processResponse(res, Response.error("You are not logged in."));
+      return true;
+    }
+    if (await this.main.cryptoService.hasKeyInMemory()) {
+      return false;
+    } else if (await this.main.cryptoService.hasKeyStored(KeySuffixOptions.Auto)) {
+      // load key into memory
+      await this.main.cryptoService.getKey();
+      return false;
+    }
+    this.processResponse(res, Response.error("Vault is locked."));
+    return true;
+  }
 }