diff --git a/.github/dependabot.yml b/.github/dependabot.yml
new file mode 100644
index 0000000..16d702c
--- /dev/null
+++ b/.github/dependabot.yml
@@ -0,0 +1,12 @@
+version: 2
+updates:
+  - package-ecosystem: npm
+    directory: /
+    open-pull-requests-limit: 10
+    schedule:
+      interval: weekly
+  - package-ecosystem: github-actions
+    directory: /.github/workflows
+    open-pull-requests-limit: 10
+    schedule:
+      interval: weekly
diff --git a/.github/workflows/json-ci.yml b/.github/workflows/json-ci.yml
new file mode 100644
index 0000000..2b0aa43
--- /dev/null
+++ b/.github/workflows/json-ci.yml
@@ -0,0 +1,25 @@
+name: JSON CI
+
+on: pull_request
+
+jobs:
+  lint-and-validate:
+    name: JSON Lint & OpenAPI Validate
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      statuses: write
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@v6.0.2
+        with:
+          fetch-depth: 0
+      - name: Run Super-Linter
+        uses: super-linter/super-linter@v8.5.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          VALIDATE_ALL_CODEBASE: true
+          VALIDATE_JSON: true
+          VALIDATE_OPENAPI: true
+          ENABLE_GITHUB_PULL_REQUEST_SUMMARY_COMMENT: true
diff --git a/expressServer.js b/expressServer.js
index 92aea43..9500c7b 100644
--- a/expressServer.js
+++ b/expressServer.js
@@ -3,7 +3,6 @@ const fs = require("node:fs");
 const path = require("node:path");
 const express = require("express");
 const cors = require("cors");
-const cookieParser = require("cookie-parser");
 const bodyParser = require("body-parser");
 const OpenApiValidator = require("express-openapi-validator");
 const logger = require("./logger");
@@ -134,7 +133,6 @@ class ExpressServer {
     this.app.use(bodyParser.json({ limit: "14MB" }));
     this.app.use(express.json());
     this.app.use(express.urlencoded({ extended: false }));
-    this.app.use(cookieParser());
     this.app.use((_req, res, next) => {
       res.set("API-Version", this.schema.info.version);
       next();
diff --git a/index.js b/index.js
index b8a28ff..4f1f314 100644
--- a/index.js
+++ b/index.js
@@ -1,15 +1,33 @@
+const fs = require("node:fs");
+const path = require("node:path");
+
+const loadLocalEnvFile = () => {
+  if (typeof process.loadEnvFile !== "function") {
+    return;
+  }
+  const envPath = path.join(__dirname, ".env");
+  if (!fs.existsSync(envPath)) {
+    return;
+  }
+  process.loadEnvFile(envPath);
+};
+
+loadLocalEnvFile();
+
 const config = require("./config");
 const logger = require("./logger");
 const ExpressServer = require("./expressServer");
 
+let expressServer;
+
 const launchServer = async () => {
   try {
-    this.expressServer = new ExpressServer(config.URL_PORT, config.OPENAPI_JSON);
-    this.expressServer.launch();
+    expressServer = new ExpressServer(config.URL_PORT, config.OPENAPI_JSON);
+    expressServer.launch();
     logger.info("Express server running");
   } catch (error) {
     logger.error("Express Server failure", error.message);
-    await this.close();
+    await expressServer?.close?.();
   }
 };
 
diff --git a/package-lock.json b/package-lock.json
index 0d2c24d..a7da454 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -9,25 +9,24 @@
       "version": "1.0.0",
       "license": "Unlicense",
       "dependencies": {
-        "@redocly/cli": "^2.11.0",
+        "@apiture/openapi-down-convert": "^0.14.2",
+        "@redocly/cli": "^2.20.5",
+        "@scalar/openapi-upgrader": "^0.1.8",
         "@stoplight/spectral-parsers": "^1.0.5",
         "@stoplight/spectral-rulesets": "^1.22.0",
         "@stoplight/spectral-runtime": "^1.1.4",
         "body-parser": "^2.2.0",
         "case-anything": "^3.1.2",
-        "cookie-parser": "^1.4.7",
         "cors": "^2.8.5",
         "express": "^5.1.0",
-        "express-openapi-validator": "^5.6.0",
+        "express-openapi-validator": "^5.6.2",
         "js-yaml": "^4.1.0",
         "jszip": "^3.10.1",
         "openapi-to-postmanv2": "^5.3.4",
         "winston": "^3.18.3"
       },
       "devDependencies": {
-        "@biomejs/biome": "^2.3.4",
-        "chai": "^6.2.0",
-        "chai-as-promised": "^8.0.2"
+        "@biomejs/biome": "^2.3.4"
       }
     },
     "node_modules/@apidevtools/json-schema-ref-parser": {
@@ -48,6 +47,29 @@
         "@types/json-schema": "^7.0.15"
       }
     },
+    "node_modules/@apiture/openapi-down-convert": {
+      "version": "0.14.2",
+      "resolved": "https://registry.npmjs.org/@apiture/openapi-down-convert/-/openapi-down-convert-0.14.2.tgz",
+      "integrity": "sha512-vT3eqOEmJ4KZ2qojycEV0zzFBPDrkwntyfnWi8/WMaag8jvGN4osIdVRuwxWcK6AvQr32ohrpcLGqEZ+ZHVNcw==",
+      "license": "ISC",
+      "dependencies": {
+        "commander": "^9.4.1",
+        "js-yaml": "^4.1.0",
+        "typescript": "^4.8.4"
+      },
+      "bin": {
+        "openapi-down-convert": "lib/src/cli.js"
+      }
+    },
+    "node_modules/@apiture/openapi-down-convert/node_modules/commander": {
+      "version": "9.5.0",
+      "resolved": "https://registry.npmjs.org/commander/-/commander-9.5.0.tgz",
+      "integrity": "sha512-KRs7WVDKg86PWiuAqhDrAQnTXZKraVcCc6vFdL14qrZ/DcWwuRo7VoiYXalXO7S5GKpqYiVEwCbgFDfxNHKJBQ==",
+      "license": "MIT",
+      "engines": {
+        "node": "^12.20.0 || >=14"
+      }
+    },
     "node_modules/@asyncapi/specs": {
       "version": "6.10.0",
       "resolved": "https://registry.npmjs.org/@asyncapi/specs/-/specs-6.10.0.tgz",
@@ -58,12 +80,12 @@
       }
     },
     "node_modules/@babel/code-frame": {
-      "version": "7.27.1",
-      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.27.1.tgz",
-      "integrity": "sha512-cjQ7ZlQ0Mv3b47hABuTevyTuYN4i+loJKGeV9flcCgIK37cCXRh+L1bd3iBHlynerhQ7BhCkn2BPbQUL+rGqFg==",
+      "version": "7.29.0",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.29.0.tgz",
+      "integrity": "sha512-9NhCeYjq9+3uxgdtp20LSiJXJvN0FeCtNGpJxuMFZ1Kv3cWUNb6DOhJwUvcVCzKGR66cw4njwM6hrJLqgOwbcw==",
       "license": "MIT",
       "dependencies": {
-        "@babel/helper-validator-identifier": "^7.27.1",
+        "@babel/helper-validator-identifier": "^7.28.5",
         "js-tokens": "^4.0.0",
         "picocolors": "^1.1.1"
       },
@@ -273,24 +295,24 @@
       }
     },
     "node_modules/@emotion/is-prop-valid": {
-      "version": "1.2.2",
-      "resolved": "https://registry.npmjs.org/@emotion/is-prop-valid/-/is-prop-valid-1.2.2.tgz",
-      "integrity": "sha512-uNsoYd37AFmaCdXlg6EYD1KaPOaRWRByMCYzbKUX4+hhMfrxdVSelShywL4JVaAeM/eHUOSprYBQls+/neX3pw==",
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/@emotion/is-prop-valid/-/is-prop-valid-1.4.0.tgz",
+      "integrity": "sha512-QgD4fyscGcbbKwJmqNvUMSE02OsHUa+lAWKdEUIJKgqe5IwRSKd7+KhibEWdaKwgjLj0DRSHA9biAIqGBk05lw==",
       "license": "MIT",
       "dependencies": {
-        "@emotion/memoize": "^0.8.1"
+        "@emotion/memoize": "^0.9.0"
       }
     },
     "node_modules/@emotion/memoize": {
-      "version": "0.8.1",
-      "resolved": "https://registry.npmjs.org/@emotion/memoize/-/memoize-0.8.1.tgz",
-      "integrity": "sha512-W2P2c/VRW1/1tLox0mVUalvnWXxavmv/Oum2aPsRcoDJuob75FC3Y8FbpfLwUegRcxINtGUMPq0tFCvYNTBXNA==",
+      "version": "0.9.0",
+      "resolved": "https://registry.npmjs.org/@emotion/memoize/-/memoize-0.9.0.tgz",
+      "integrity": "sha512-30FAj7/EoJ5mwVPOWhAyCX+FPfMDrVecJAM+Iw9NRoSl4BBAQeqj4cApHHUXOVvIPgLVDsCFoz/hGD+5QQD1GQ==",
       "license": "MIT"
     },
     "node_modules/@emotion/unitless": {
-      "version": "0.8.1",
-      "resolved": "https://registry.npmjs.org/@emotion/unitless/-/unitless-0.8.1.tgz",
-      "integrity": "sha512-KOEGMu6dmJZtpadb476IsZBclKvILjopjUii3V+7MnXIQCYh8W3NgNcgwo21n9LXZX6EDIKvqfjYxXebDwxKmQ==",
+      "version": "0.10.0",
+      "resolved": "https://registry.npmjs.org/@emotion/unitless/-/unitless-0.10.0.tgz",
+      "integrity": "sha512-dFoMUuQA20zvtVTuxZww6OHoJYgrzfKM1t52mVySDJnMSEa08ruEvdYQbhvyu6soU+NeLVd3yKfTfT0NeV6qGg==",
       "license": "MIT"
     },
     "node_modules/@exodus/schemasafe": {
@@ -315,123 +337,6 @@
         "node": ">=10.10.0"
       }
     },
-    "node_modules/@isaacs/balanced-match": {
-      "version": "4.0.1",
-      "resolved": "https://registry.npmjs.org/@isaacs/balanced-match/-/balanced-match-4.0.1.tgz",
-      "integrity": "sha512-yzMTt9lEb8Gv7zRioUilSglI0c0smZ9k5D65677DLWLtWJaXIS3CqcGyUFByYKlnUj6TkjLVs54fBl6+TiGQDQ==",
-      "license": "MIT",
-      "engines": {
-        "node": "20 || >=22"
-      }
-    },
-    "node_modules/@isaacs/brace-expansion": {
-      "version": "5.0.0",
-      "resolved": "https://registry.npmjs.org/@isaacs/brace-expansion/-/brace-expansion-5.0.0.tgz",
-      "integrity": "sha512-ZT55BDLV0yv0RBm2czMiZ+SqCGO7AvmOM3G/w2xhVPH+te0aKgFjmBvGlL1dH+ql2tgGO3MVrbb3jCKyvpgnxA==",
-      "license": "MIT",
-      "dependencies": {
-        "@isaacs/balanced-match": "^4.0.1"
-      },
-      "engines": {
-        "node": "20 || >=22"
-      }
-    },
-    "node_modules/@isaacs/cliui": {
-      "version": "8.0.2",
-      "resolved": "https://registry.npmjs.org/@isaacs/cliui/-/cliui-8.0.2.tgz",
-      "integrity": "sha512-O8jcjabXaleOG9DQ0+ARXWZBTfnP4WNAqzuiJK7ll44AmxGKv/J2M4TPjxjY3znBCfvBXFzucm1twdyFybFqEA==",
-      "license": "ISC",
-      "dependencies": {
-        "string-width": "^5.1.2",
-        "string-width-cjs": "npm:string-width@^4.2.0",
-        "strip-ansi": "^7.0.1",
-        "strip-ansi-cjs": "npm:strip-ansi@^6.0.1",
-        "wrap-ansi": "^8.1.0",
-        "wrap-ansi-cjs": "npm:wrap-ansi@^7.0.0"
-      },
-      "engines": {
-        "node": ">=12"
-      }
-    },
-    "node_modules/@isaacs/cliui/node_modules/ansi-regex": {
-      "version": "6.2.2",
-      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-6.2.2.tgz",
-      "integrity": "sha512-Bq3SmSpyFHaWjPk8If9yc6svM8c56dB5BAtW4Qbw5jHTwwXXcTLoRMkpDJp6VL0XzlWaCHTXrkFURMYmD0sLqg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/ansi-regex?sponsor=1"
-      }
-    },
-    "node_modules/@isaacs/cliui/node_modules/ansi-styles": {
-      "version": "6.2.3",
-      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-6.2.3.tgz",
-      "integrity": "sha512-4Dj6M28JB+oAH8kFkTLUo+a2jwOFkuqb3yucU0CANcRRUbxS0cP0nZYCGjcc3BNXwRIsUVmDGgzawme7zvJHvg==",
-      "license": "MIT",
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
-      }
-    },
-    "node_modules/@isaacs/cliui/node_modules/emoji-regex": {
-      "version": "9.2.2",
-      "resolved": "https://registry.npmjs.org/emoji-regex/-/emoji-regex-9.2.2.tgz",
-      "integrity": "sha512-L18DaJsXSUk2+42pv8mLs5jJT2hqFkFE4j21wOmgbUqsZ2hL72NsUU785g9RXgo3s0ZNgVl42TiHp3ZtOv/Vyg==",
-      "license": "MIT"
-    },
-    "node_modules/@isaacs/cliui/node_modules/string-width": {
-      "version": "5.1.2",
-      "resolved": "https://registry.npmjs.org/string-width/-/string-width-5.1.2.tgz",
-      "integrity": "sha512-HnLOCR3vjcY8beoNLtcjZ5/nxn2afmME6lhrDrebokqMap+XbeW8n9TXpPDOqdGK5qcI3oT0GKTW6wC7EMiVqA==",
-      "license": "MIT",
-      "dependencies": {
-        "eastasianwidth": "^0.2.0",
-        "emoji-regex": "^9.2.2",
-        "strip-ansi": "^7.0.1"
-      },
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/sponsors/sindresorhus"
-      }
-    },
-    "node_modules/@isaacs/cliui/node_modules/strip-ansi": {
-      "version": "7.1.2",
-      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-7.1.2.tgz",
-      "integrity": "sha512-gmBGslpoQJtgnMAvOVqGZpEz9dyoKTCzy2nfz/n8aIFhN/jCE/rCmcxabB6jOOHV+0WNnylOxaxBQPSvcWklhA==",
-      "license": "MIT",
-      "dependencies": {
-        "ansi-regex": "^6.0.1"
-      },
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/strip-ansi?sponsor=1"
-      }
-    },
-    "node_modules/@isaacs/cliui/node_modules/wrap-ansi": {
-      "version": "8.1.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-8.1.0.tgz",
-      "integrity": "sha512-si7QWI6zUMq56bESFvagtmzMdGOtoxfR+Sez11Mobfc7tm+VkUckk9bW2UeffTGVUbOksxmSw0AA2gs8g71NCQ==",
-      "license": "MIT",
-      "dependencies": {
-        "ansi-styles": "^6.1.0",
-        "string-width": "^5.0.1",
-        "strip-ansi": "^7.0.1"
-      },
-      "engines": {
-        "node": ">=12"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
-      }
-    },
     "node_modules/@jsdevtools/ono": {
       "version": "7.1.3",
       "resolved": "https://registry.npmjs.org/@jsdevtools/ono/-/ono-7.1.3.tgz",
@@ -748,15 +653,15 @@
       "license": "BSD-3-Clause"
     },
     "node_modules/@redocly/ajv": {
-      "version": "8.11.4",
-      "resolved": "https://registry.npmjs.org/@redocly/ajv/-/ajv-8.11.4.tgz",
-      "integrity": "sha512-77MhyFgZ1zGMwtCpqsk532SJEc3IJmSOXKTCeWoMTAvPnQOkuOgxEip1n5pG5YX1IzCTJ4kCvPKr8xYyzWFdhg==",
+      "version": "8.18.0",
+      "resolved": "https://registry.npmjs.org/@redocly/ajv/-/ajv-8.18.0.tgz",
+      "integrity": "sha512-F+LMD2IDIXuHxgpLJh3nkLj9+tSaEzoUWd+7fONGq5pe2169FUDjpEkOfEpoGLz1sbZni/69p07OsecNfAOpqA==",
       "license": "MIT",
       "dependencies": {
-        "fast-deep-equal": "^3.1.1",
+        "fast-deep-equal": "^3.1.3",
+        "fast-uri": "^3.0.1",
         "json-schema-traverse": "^1.0.0",
-        "require-from-string": "^2.0.2",
-        "uri-js-replace": "^1.0.1"
+        "require-from-string": "^2.0.2"
       },
       "funding": {
         "type": "github",
@@ -764,36 +669,38 @@
       }
     },
     "node_modules/@redocly/cli": {
-      "version": "2.11.0",
-      "resolved": "https://registry.npmjs.org/@redocly/cli/-/cli-2.11.0.tgz",
-      "integrity": "sha512-Wr8me9M5tQ4pZT7Z0Llxojlo8L0GBBt45zceQ8iKyBmJUHWDbKYYdKubZBCH0XktQLEA8HitYBGN1unsxwx20g==",
+      "version": "2.21.1",
+      "resolved": "https://registry.npmjs.org/@redocly/cli/-/cli-2.21.1.tgz",
+      "integrity": "sha512-tqMvNzXB2dD9ThfNo3O69ZwNPfs1O41q04o1Fgc4iSNn1jpKUcE371u79qF4q/axRpbvQblZs7I6i7XwRN/zmg==",
       "license": "MIT",
       "dependencies": {
         "@opentelemetry/exporter-trace-otlp-http": "0.202.0",
         "@opentelemetry/resources": "2.0.1",
         "@opentelemetry/sdk-trace-node": "2.0.1",
         "@opentelemetry/semantic-conventions": "1.34.0",
-        "@redocly/openapi-core": "2.11.0",
-        "@redocly/respect-core": "2.11.0",
+        "@redocly/openapi-core": "2.21.1",
+        "@redocly/respect-core": "2.21.1",
         "abort-controller": "^3.0.0",
-        "chokidar": "^3.5.1",
+        "ajv": "npm:@redocly/ajv@8.18.0",
+        "ajv-formats": "^3.0.1",
         "colorette": "^1.2.0",
         "cookie": "^0.7.2",
         "dotenv": "16.4.7",
-        "form-data": "^4.0.4",
-        "glob": "^11.0.1",
+        "glob": "^13.0.5",
         "handlebars": "^4.7.6",
         "https-proxy-agent": "^7.0.5",
         "mobx": "^6.0.4",
+        "picomatch": "^4.0.3",
         "pluralize": "^8.0.0",
-        "react": "^17.0.0 || ^18.2.0 || ^19.0.0",
-        "react-dom": "^17.0.0 || ^18.2.0 || ^19.0.0",
+        "react": "^17.0.0 || ^18.2.0 || ^19.2.1",
+        "react-dom": "^17.0.0 || ^18.2.0 || ^19.2.1",
         "redoc": "2.5.1",
         "semver": "^7.5.2",
         "set-cookie-parser": "^2.3.5",
         "simple-websocket": "^9.0.0",
-        "styled-components": "^6.0.7",
-        "undici": "^6.21.3",
+        "styled-components": "6.3.9",
+        "ulid": "^3.0.1",
+        "undici": "^6.23.0",
         "yargs": "17.0.1"
       },
       "bin": {
@@ -805,6 +712,23 @@
         "npm": ">=10"
       }
     },
+    "node_modules/@redocly/cli/node_modules/ajv": {
+      "name": "@redocly/ajv",
+      "version": "8.18.0",
+      "resolved": "https://registry.npmjs.org/@redocly/ajv/-/ajv-8.18.0.tgz",
+      "integrity": "sha512-F+LMD2IDIXuHxgpLJh3nkLj9+tSaEzoUWd+7fONGq5pe2169FUDjpEkOfEpoGLz1sbZni/69p07OsecNfAOpqA==",
+      "license": "MIT",
+      "dependencies": {
+        "fast-deep-equal": "^3.1.3",
+        "fast-uri": "^3.0.1",
+        "json-schema-traverse": "^1.0.0",
+        "require-from-string": "^2.0.2"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/epoberezkin"
+      }
+    },
     "node_modules/@redocly/cli/node_modules/cliui": {
       "version": "7.0.4",
       "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.4.tgz",
@@ -856,23 +780,24 @@
       }
     },
     "node_modules/@redocly/config": {
-      "version": "0.37.0",
-      "resolved": "https://registry.npmjs.org/@redocly/config/-/config-0.37.0.tgz",
-      "integrity": "sha512-cYN+rTTCQIp5mVt1xumJsNqpZcaPVUf1x0ryD0QKXpVKsxKc+lHaMF2P1CqMgdQNY9B7i84z/kvxD0EhxzlxbQ==",
+      "version": "0.44.1",
+      "resolved": "https://registry.npmjs.org/@redocly/config/-/config-0.44.1.tgz",
+      "integrity": "sha512-l6/ZE+/RBfNDdhzltau6cbW8+k5PgJbJBMqaBrlQlZQlmGBHMxqGyDaon4dPLj0jdi37gsMQ3yf95JBY/vaDSg==",
       "license": "MIT",
       "dependencies": {
         "json-schema-to-ts": "2.7.2"
       }
     },
     "node_modules/@redocly/openapi-core": {
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+    },
     "node_modules/unbox-primitive": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/unbox-primitive/-/unbox-primitive-1.1.0.tgz",
@@ -6333,9 +5906,9 @@
       }
     },
     "node_modules/undici": {
-      "version": "6.22.0",
-      "resolved": "https://registry.npmjs.org/undici/-/undici-6.22.0.tgz",
-      "integrity": "sha512-hU/10obOIu62MGYjdskASR3CUAiYaFTtC9Pa6vHyf//mAipSvSQg6od2CnJswq7fvzNS3zJhxoRkgNVaHurWKw==",
+      "version": "6.23.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-6.23.0.tgz",
+      "integrity": "sha512-VfQPToRA5FZs/qJxLIinmU59u0r7LXqoJkCzinq3ckNJp3vKEh7jTWN589YQ5+aoAC/TGRLyJLCPKcLQbM8r9g==",
       "license": "MIT",
       "engines": {
         "node": ">=18.17"
@@ -6365,12 +5938,6 @@
         "punycode": "^2.1.0"
       }
     },
-    "node_modules/uri-js-replace": {
-      "version": "1.0.1",
-      "resolved": "https://registry.npmjs.org/uri-js-replace/-/uri-js-replace-1.0.1.tgz",
-      "integrity": "sha512-W+C9NWNLFOoBI2QWDp4UT9pv65r2w5Cx+3sTYFvtMdDBxkKt1syCqsUdSFAChbEe1uK5TfS04wt/nGwmaeIQ0g==",
-      "license": "MIT"
-    },
     "node_modules/urijs": {
       "version": "1.19.11",
       "resolved": "https://registry.npmjs.org/urijs/-/urijs-1.19.11.tgz",
@@ -6474,21 +6041,6 @@
         "webidl-conversions": "^3.0.0"
       }
     },
-    "node_modules/which": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
-      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
-      "license": "ISC",
-      "dependencies": {
-        "isexe": "^2.0.0"
-      },
-      "bin": {
-        "node-which": "bin/node-which"
-      },
-      "engines": {
-        "node": ">= 8"
-      }
-    },
     "node_modules/which-boxed-primitive": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/which-boxed-primitive/-/which-boxed-primitive-1.1.1.tgz",
@@ -6633,24 +6185,6 @@
         "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
       }
     },
-    "node_modules/wrap-ansi-cjs": {
-      "name": "wrap-ansi",
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-7.0.0.tgz",
-      "integrity": "sha512-YVGIj2kamLSTxw6NsZjoBxfSwsn0ycdesmc4p+Q21c5zPuZ1pl+NfxVdxPtdHvmNVOQ6XSYG4AUtyt/Fi7D16Q==",
-      "license": "MIT",
-      "dependencies": {
-        "ansi-styles": "^4.0.0",
-        "string-width": "^4.1.0",
-        "strip-ansi": "^6.0.0"
-      },
-      "engines": {
-        "node": ">=10"
-      },
-      "funding": {
-        "url": "https://github.com/chalk/wrap-ansi?sponsor=1"
-      }
-    },
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
@@ -6737,6 +6271,15 @@
       "engines": {
         "node": ">=12"
       }
+    },
+    "node_modules/zod": {
+      "version": "4.3.6",
+      "resolved": "https://registry.npmjs.org/zod/-/zod-4.3.6.tgz",
+      "integrity": "sha512-rftlrkhHZOcjDwkGlnUtZZkvaPHCsDATp4pGpuOOMDaTdDDXF91wuVDJoWoPsKX/3YPQ5fHuF3STjcYyKr+Qhg==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://github.com/sponsors/colinhacks"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 95dabf2..2f544f4 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,7 @@
     "prestart": "npm install",
     "start": "node index.js",
     "start-mock": "USE_MOCKS=true node index.js",
+    "test": "node --test",
     "lint": "biome lint .",
     "format": "biome format --write ."
   },
@@ -17,24 +18,23 @@
   "license": "Unlicense",
   "private": true,
   "dependencies": {
-    "@redocly/cli": "^2.11.0",
+    "@apiture/openapi-down-convert": "^0.14.2",
+    "@redocly/cli": "^2.20.5",
+    "@scalar/openapi-upgrader": "^0.1.8",
     "@stoplight/spectral-parsers": "^1.0.5",
     "@stoplight/spectral-rulesets": "^1.22.0",
     "@stoplight/spectral-runtime": "^1.1.4",
     "body-parser": "^2.2.0",
     "case-anything": "^3.1.2",
-    "cookie-parser": "^1.4.7",
     "cors": "^2.8.5",
     "express": "^5.1.0",
-    "express-openapi-validator": "^5.6.0",
+    "express-openapi-validator": "^5.6.2",
     "js-yaml": "^4.1.0",
     "jszip": "^3.10.1",
     "openapi-to-postmanv2": "^5.3.4",
     "winston": "^3.18.3"
   },
   "devDependencies": {
-    "@biomejs/biome": "^2.3.4",
-    "chai": "^6.2.0",
-    "chai-as-promised": "^8.0.2"
+    "@biomejs/biome": "^2.3.4"
   }
 }
diff --git a/services/OasConversionService.js b/services/OasConversionService.js
index 4152608..d851085 100644
--- a/services/OasConversionService.js
+++ b/services/OasConversionService.js
@@ -1,9 +1,10 @@
+const { Converter } = require("@apiture/openapi-down-convert");
+const { upgrade: scalarUpgrade } = require("@scalar/openapi-upgrader");
 const jsYaml = require("js-yaml");
 const Service = require("./Service");
 const { resolveOasInput } = require("./OasInputService");
 const logger = require("../logger");
 
-const JSON_SCHEMA_DIALECT_BASE = "https://spec.openapis.org/oas/3.1/dialect/base";
 const DEFAULT_TARGET_VERSION = "3.1.0";
 
 const EMPTY_BODY_ERROR = "Body ontbreekt of ongeldig: gebruik oasUrl of oasBody";
@@ -35,131 +36,13 @@ const parseSpecification = (contents) => {
   }
 };
 
-const mergeTypeWithNull = (target) => {
-  const current = target.type;
-  if (Array.isArray(current)) {
-    const hasNull = current.some((value) => value === "null");
-    target.type = hasNull ? current : [...current, "null"];
-    return;
-  }
-  if (typeof current === "string" && current.length > 0) {
-    target.type = [current, "null"];
-    return;
-  }
-  target.type = ["null"];
-};
-
-const convertSchemas30To31 = (node) => {
-  if (Array.isArray(node)) {
-    for (const item of node) {
-      convertSchemas30To31(item);
-    }
-    return;
-  }
-  if (!node || typeof node !== "object") {
-    return;
-  }
-  Object.entries(node).forEach(([key, value]) => {
-    convertSchemas30To31(value);
-    node[key] = value;
-  });
-  if (node.nullable === true) {
-    mergeTypeWithNull(node);
-    delete node.nullable;
-  }
-};
-
-const normalizeTypeArray = (target) => {
-  const currentType = target.type;
-  if (!Array.isArray(currentType)) {
-    return;
-  }
-  const filtered = [];
-  let hasNull = false;
-  currentType.forEach((item) => {
-    if (item === null || item === undefined) {
-      return;
-    }
-    if (typeof item === "string" && item === "null") {
-      hasNull = true;
-      return;
-    }
-    filtered.push(item);
-  });
-  if (hasNull) {
-    target.nullable = true;
-  }
-  if (filtered.length === 0) {
-    delete target.type;
-  } else if (filtered.length === 1) {
-    [target.type] = filtered;
-  } else {
-    target.type = filtered;
-  }
-};
-
-const normalizeEnumNull = (target) => {
-  const { enum: enumValues } = target;
-  if (!Array.isArray(enumValues)) {
-    return;
-  }
-  const filtered = [];
-  let hasNull = false;
-  enumValues.forEach((value) => {
-    if (value === null) {
-      hasNull = true;
-      return;
-    }
-    filtered.push(value);
-  });
-  if (hasNull) {
-    target.nullable = true;
-  }
-  if (filtered.length === 0) {
-    delete target.enum;
-    return;
-  }
-  if (filtered.length !== enumValues.length) {
-    target.enum = filtered;
-  }
-};
-
-const convertSchemas31To30 = (node) => {
-  if (Array.isArray(node)) {
-    for (const item of node) {
-      convertSchemas31To30(item);
-    }
-    return;
-  }
-  if (!node || typeof node !== "object") {
-    return;
-  }
-  Object.entries(node).forEach(([key, value]) => {
-    convertSchemas31To30(value);
-    node[key] = value;
-  });
-  if (Object.hasOwn(node, "const")) {
-    if (!Object.hasOwn(node, "enum")) {
-      node.enum = [node.const];
-    }
-    delete node.const;
-  }
-  normalizeTypeArray(node);
-  normalizeEnumNull(node);
-};
-
-const normalizeVersionInput = (value) => {
-  if (typeof value === "number" && Number.isFinite(value)) {
-    return value.toString();
-  }
-  if (typeof value === "string") {
-    return value.trim();
-  }
-  return "";
-};
-
 const resolveVersionDescriptor = (value) => {
-  const raw = normalizeVersionInput(value);
+  const raw =
+    typeof value === "number" && Number.isFinite(value)
+      ? value.toString()
+      : typeof value === "string"
+        ? value.trim()
+        : "";
   if (!raw) {
     return null;
   }
@@ -191,10 +74,16 @@ const normalizeTargetVersion = (value) => {
   return descriptor.canonical;
 };
 
-const convertSpec = (spec, targetVersion) => {
+const ensureObjectSpec = (value, errorMessage) => {
+  if (!value || typeof value !== "object" || Array.isArray(value)) {
+    throw new Error(errorMessage);
+  }
+  return value;
+};
+
+const convertSpec = async (spec, targetVersion, options = {}) => {
   const sourceDescriptor = resolveVersionDescriptor(spec.openapi);
-  const openapiValue = spec.openapi;
-  const rawVersion = openapiValue === undefined || openapiValue === null ? "" : String(openapiValue).trim();
+  const rawVersion = spec.openapi == null ? "" : String(spec.openapi).trim();
   if (rawVersion.length === 0 || !sourceDescriptor) {
     throw Service.rejectResponse({ message: VERSION_MISSING_ERROR }, 400);
   }
@@ -205,55 +94,33 @@ const convertSpec = (spec, targetVersion) => {
   }
 
   if (sourceDescriptor.major === targetDescriptor.major) {
-    spec.openapi = targetDescriptor.canonical;
-    if (targetDescriptor.major === "3.1") {
-      if (!Object.hasOwn(spec, "jsonSchemaDialect")) {
-        spec.jsonSchemaDialect = JSON_SCHEMA_DIALECT_BASE;
-      }
-      if (Object.hasOwn(spec, "x-webhooks")) {
-        if (!Object.hasOwn(spec, "webhooks")) {
-          spec.webhooks = spec["x-webhooks"];
-        }
-        delete spec["x-webhooks"];
-      }
-    } else {
-      delete spec.jsonSchemaDialect;
-      if (Object.hasOwn(spec, "webhooks")) {
-        if (!Object.hasOwn(spec, "x-webhooks")) {
-          spec["x-webhooks"] = spec.webhooks;
-        }
-        delete spec.webhooks;
-      }
+    if (options.preserveSourceVersion && sourceDescriptor.major === "3.1") {
+      spec.openapi = rawVersion;
+      return { spec, resolvedVersion: rawVersion };
     }
-    return targetDescriptor.canonical;
+    spec.openapi = targetDescriptor.canonical;
+    return { spec, resolvedVersion: targetDescriptor.canonical };
   }
 
   if (sourceDescriptor.major === "3.0" && targetDescriptor.major === "3.1") {
-    convertSchemas30To31(spec);
-    if (!Object.hasOwn(spec, "jsonSchemaDialect")) {
-      spec.jsonSchemaDialect = JSON_SCHEMA_DIALECT_BASE;
-    }
-    if (Object.hasOwn(spec, "x-webhooks")) {
-      if (!Object.hasOwn(spec, "webhooks")) {
-        spec.webhooks = spec["x-webhooks"];
-      }
-      delete spec["x-webhooks"];
-    }
-    spec.openapi = targetDescriptor.canonical;
-    return targetDescriptor.canonical;
+    const upgraded = ensureObjectSpec(
+      scalarUpgrade(spec, "3.1"),
+      "Scalar OpenAPI upgrader retourneerde een ongeldig document.",
+    );
+    upgraded.openapi = targetDescriptor.canonical;
+    return { spec: upgraded, resolvedVersion: targetDescriptor.canonical };
   }
+
   if (sourceDescriptor.major === "3.1" && targetDescriptor.major === "3.0") {
-    convertSchemas31To30(spec);
-    delete spec.jsonSchemaDialect;
-    if (Object.hasOwn(spec, "webhooks")) {
-      if (!Object.hasOwn(spec, "x-webhooks")) {
-        spec["x-webhooks"] = spec.webhooks;
-      }
-      delete spec.webhooks;
-    }
-    spec.openapi = targetDescriptor.canonical;
-    return targetDescriptor.canonical;
+    const downConverter = new Converter(spec);
+    const downgraded = ensureObjectSpec(
+      downConverter.convert(),
+      "OpenAPI down converter retourneerde een ongeldig document.",
+    );
+    downgraded.openapi = targetDescriptor.canonical;
+    return { spec: downgraded, resolvedVersion: targetDescriptor.canonical };
   }
+
   throw Service.rejectResponse({ message: UNSUPPORTED_VERSION_ERROR }, 400);
 };
 
@@ -275,62 +142,44 @@ const serializeSpecification = (spec, format, targetVersion) => {
   };
 };
 
-const extractTargetVersion = (input) => {
-  if (input && typeof input === "object" && !Array.isArray(input) && typeof input.targetVersion === "string") {
-    return input.targetVersion;
-  }
-  return undefined;
-};
-
 const convert = async (input) => {
-  const targetVersion = normalizeTargetVersion(extractTargetVersion(input));
+  const requestedTargetVersion = typeof input?.targetVersion === "string" ? input.targetVersion : undefined;
+  const targetVersion = normalizeTargetVersion(requestedTargetVersion);
+  const hasExplicitTargetVersion =
+    typeof requestedTargetVersion === "string" && requestedTargetVersion.trim().length > 0;
   const { contents } = await resolveOasInput(input);
   let parsed;
   try {
     parsed = parseSpecification(contents);
   } catch (error) {
-    logger.error(
-      `[OasConversionService] parseSpecification failed: ${error?.message || "unknown"}${
-        error?.stack ? ` stack=${error.stack}` : ""
-      }`,
-    );
-    if (Service.isErrorResponse(error)) {
-      throw error;
-    }
-    throw Service.rejectResponse(
-      {
-        message: error.message,
-      },
-      500,
-    );
+    if (Service.isErrorResponse(error)) throw error;
+    logger.error(`[OasConversionService] parseSpecification failed: ${error?.message}`);
+    throw Service.rejectResponse({ message: error.message }, 500);
   }
+
   const { spec, format } = parsed;
+  let convertedSpec, resolvedVersion;
   try {
-    const resolvedVersion = convertSpec(spec, targetVersion);
-    const { buffer, contentType, filename } = serializeSpecification(spec, format, resolvedVersion);
-    return {
-      headers: {
-        "Content-Type": contentType,
-        "Content-Disposition": `attachment; filename="${filename}"`,
-      },
-      rawBody: buffer,
-    };
+    ({ spec: convertedSpec, resolvedVersion } = await convertSpec(spec, targetVersion, {
+      preserveSourceVersion: !hasExplicitTargetVersion,
+    }));
   } catch (error) {
-    logger.error(
-      `[OasConversionService] convertSpec failed: ${error?.message || "unknown"}${
-        error?.stack ? ` stack=${error.stack}` : ""
-      }`,
-    );
-    if (Service.isErrorResponse(error)) {
-      throw error;
-    }
+    if (Service.isErrorResponse(error)) throw error;
+    logger.error(`[OasConversionService] convertSpec failed: ${error?.message}`);
     throw Service.rejectResponse(
-      {
-        message: error.message || "Er is een fout opgetreden tijdens het converteren.",
-      },
+      { message: error.message || "Er is een fout opgetreden tijdens het converteren." },
       500,
     );
   }
+
+  const { buffer, contentType, filename } = serializeSpecification(convertedSpec, format, resolvedVersion);
+  return {
+    headers: {
+      "Content-Type": contentType,
+      "Content-Disposition": `attachment; filename="${filename}"`,
+    },
+    rawBody: buffer,
+  };
 };
 
 module.exports = {
diff --git a/test/OasConversionService.test.js b/test/OasConversionService.test.js
new file mode 100644
index 0000000..fa8f1b5
--- /dev/null
+++ b/test/OasConversionService.test.js
@@ -0,0 +1,155 @@
+const assert = require("node:assert/strict");
+const test = require("node:test");
+const jsYaml = require("js-yaml");
+const OasConversionService = require("../services/OasConversionService");
+
+const toJson = (buffer) => JSON.parse(buffer.toString("utf8"));
+const toYaml = (buffer) => jsYaml.load(buffer.toString("utf8"));
+
+test("convert 3.0 -> 3.1 (JSON) upgrades key OpenAPI features", async () => {
+  const sourceSpec = {
+    openapi: "3.0.3",
+    info: {
+      title: "Test API",
+      version: "1.0.0",
+    },
+    paths: {},
+    "x-webhooks": {
+      onEvent: {
+        post: {
+          responses: {
+            200: {
+              description: "OK",
+            },
+          },
+        },
+      },
+    },
+    components: {
+      schemas: {
+        Pet: {
+          type: "object",
+          properties: {
+            nickname: {
+              type: "string",
+              nullable: true,
+            },
+          },
+        },
+      },
+    },
+  };
+
+  const result = await OasConversionService.convert({
+    oasBody: JSON.stringify(sourceSpec),
+    targetVersion: "3.1",
+  });
+
+  const converted = toJson(result.rawBody);
+
+  assert.equal(result.headers["Content-Type"], "application/json");
+  assert.equal(result.headers["Content-Disposition"], 'attachment; filename="openapi-3-1-0.json"');
+  assert.equal(converted.openapi, "3.1.0");
+  assert.ok(Object.hasOwn(converted, "webhooks"));
+  assert.ok(!Object.hasOwn(converted, "x-webhooks"));
+  assert.deepEqual(converted.components.schemas.Pet.properties.nickname.type, ["string", "null"]);
+});
+
+test("convert 3.1 -> 3.0 (JSON) downgrades key OpenAPI features", async () => {
+  const sourceSpec = {
+    openapi: "3.1.0",
+    info: {
+      title: "Test API",
+      version: "1.0.0",
+    },
+    paths: {},
+    webhooks: {
+      onEvent: {
+        post: {
+          responses: {
+            200: {
+              description: "OK",
+            },
+          },
+        },
+      },
+    },
+    components: {
+      schemas: {
+        Pet: {
+          type: "object",
+          properties: {
+            nickname: {
+              type: ["string", "null"],
+            },
+          },
+        },
+      },
+    },
+  };
+
+  const result = await OasConversionService.convert({
+    oasBody: JSON.stringify(sourceSpec),
+    targetVersion: "3.0",
+  });
+
+  const converted = toJson(result.rawBody);
+
+  assert.equal(result.headers["Content-Type"], "application/json");
+  assert.equal(result.headers["Content-Disposition"], 'attachment; filename="openapi-3-0-3.json"');
+  assert.equal(converted.openapi, "3.0.3");
+  assert.ok(!Object.hasOwn(converted, "webhooks"));
+  assert.equal(converted.components.schemas.Pet.properties.nickname.type, "string");
+  assert.equal(converted.components.schemas.Pet.properties.nickname.nullable, true);
+});
+
+test("convert preserves YAML format in response", async () => {
+  const sourceSpecYaml = `
+openapi: 3.0.3
+info:
+  title: Test API
+  version: 1.0.0
+paths: {}
+components:
+  schemas:
+    Item:
+      type: object
+      properties:
+        maybeText:
+          type: string
+          nullable: true
+`;
+
+  const result = await OasConversionService.convert({
+    oasBody: sourceSpecYaml,
+    targetVersion: "3.1",
+  });
+
+  const converted = toYaml(result.rawBody);
+
+  assert.equal(result.headers["Content-Type"], "application/yaml");
+  assert.equal(result.headers["Content-Disposition"], 'attachment; filename="openapi-3-1-0.yaml"');
+  assert.equal(converted.openapi, "3.1.0");
+  assert.deepEqual(converted.components.schemas.Item.properties.maybeText.type, ["string", "null"]);
+});
+
+test("convert without targetVersion keeps existing 3.1 patch version", async () => {
+  const sourceSpec = {
+    openapi: "3.1.2",
+    info: {
+      title: "Test API",
+      version: "1.0.0",
+    },
+    paths: {},
+  };
+
+  const result = await OasConversionService.convert({
+    oasBody: JSON.stringify(sourceSpec),
+  });
+
+  const converted = toJson(result.rawBody);
+
+  assert.equal(result.headers["Content-Type"], "application/json");
+  assert.equal(result.headers["Content-Disposition"], 'attachment; filename="openapi-3-1-2.json"');
+  assert.equal(converted.openapi, "3.1.2");
+});