init

.gitignore

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+node_modules

index.mjs

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+import Fastify from 'fastify';
+import Prism from 'prismjs';
+import loadLanguages from 'prismjs/components/index.js';
+
+loadLanguages();
+
+const fastify = Fastify({
+  logger: true
+})
+// Declare a route
+fastify.post('/', function (request, reply) {
+  const data = request.body
+  if(!data.startsWith('```')) {
+      return reply.send(request.body)
+  }
+  const regex = data.match(/^```([a-zA-Z]*)$/m)
+  const lang = regex[1]
+  if(!lang) {
+    return reply.send(request.body)
+  }
+  return Prism.highlight(data, Prism.languages[lang], lang)
+})
+
+// Run the server!
+fastify.listen(process.env.PORT || 3000, function (err, address) {
+  if (err) {
+    fastify.log.error(err)
+    process.exit(1)
+  }
+  console.log(`Server is now listening on ${address}`)
+})

package.json

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+{
+  "name": "prismasaservice",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.mjs",
+  "scripts": {
+    "start": "node ./index.mjs"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "fastify": "^3.27.4",
+    "fastify-cli": "^2.15.0",
+    "prismjs": "^1.27.0"
+  }
+}