Can create sessions using Netlify Functions

.gitignore

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+# Local Netlify folder
+.netlify
+node_modules

functions/hello.js

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+exports.handler = async event => {
+  try {
+    return {
+      statusCode: 200,
+      body: JSON.stringify({ message: 'ok' })
+    }
+  } catch (err) {
+    console.error(err.String())
+    return { statusCode: 500, body: err.toString() }
+  }
+}

functions/session.js

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+const OpenTok = require('opentok')
+const OT = new OpenTok(process.env.VIDEO_KEY, process.env.VIDEO_SECRET)
+const MongoClient = require('mongodb').MongoClient
+const client = new MongoClient(process.env.MONGODB_URL, { useNewUrlParser: true, useUnifiedTopology: true })
+
+exports.handler = async event => {
+  try {
+    await client.connect()
+    const sessions = client.db('bat').collection('sessions')
+    let session = await sessions.findOne({ friendly: event.queryStringParameters.room })
+
+    if (!session) {
+      const newSession = { sessionId: await createSession(), friendly: event.queryStringParameters.room }
+      await sessions.insertOne(newSession)
+      session = newSession
+    }
+
+    return {
+      statusCode: 200,
+      body: JSON.stringify({
+        sessionId: session.sessionId,
+        apiKey: process.env.VIDEO_KEY,
+        token: OT.generateToken(session.sessionId, { role: 'publisher' })
+      })
+    }
+  } catch (err) {
+    console.error(String(err))
+    return { statusCode: 500, body: String(err) }
+  }
+}
+
+function createSession() {
+  return new Promise((resolve, reject) => {
+    OT.createSession((err, session) => {
+      if (err) reject(err)
+      resolve(session.sessionId)
+    })
+  })
+}

netlify.toml

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+[build]
+    functions = "functions"
+[[redirects]]
+    from = "/api/*"
+    to = "/.netlify/functions/:splat"
+    status = 200