Example for MongoDB

.github/workflows/mongodb-service.yml

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+name: Mongodb Service Example
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+
+defaults:
+  run:
+    working-directory: ./mongodb
+
+jobs:
+  container-job:
+    runs-on: ubuntu-latest
+
+    # runs all of the steps inside the specified container rather than on the VM host.  
+    # Because of this the network configuration changes from host based network to a container network.
+    container:
+      image:  node:10.16-jessie
+
+    services:
+      mongodb:
+        image: mongo
+        ports:
+        - 27017:27017
+
+    steps:
+    - uses: actions/checkout@v1     
+    - run: npm ci
+    - run: node client.js
+      env:
+        # use mongodb for the host here because we have specified a container for the job.
+        # If we were running the job on the VM this would be localhost
+        MONGODB_HOST: mongodb
+        MONGODB_PORT: ${{ job.services.mongodb.ports[27017] }}
+
+# Runs all steps on the VM
+# The service containers will use host port binding instead of container networking so you access them via localhost rather than the service name
+  vm-job:
+    runs-on: ubuntu-latest
+
+    services:
+      mongodb:
+        image: mongo
+        ports:
+        # will assign a random free host port
+        - 27017/tcp
+
+    steps:
+    - uses: actions/checkout@v1     
+    - run: npm ci
+    - run: node client.js
+      env:
+        # use localhost for the host here because we are running the job on the VM.
+        # If we were running the job on in a container this would be mongodb
+        MONGODB_HOST: localhost
+        MONGODB_PORT: ${{ job.services.mongodb.ports[27017] }} # get randomly assigned published port

mongodb/client.js

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+const { MongoClient } = require("mongodb");
+const PORT = process.env.MONGODB_PORT || 27017;
+const HOST = process.env.MONGODB_HOST || "localhost";
+
+async function main() {
+  const client = new MongoClient(`mongodb://${HOST}:${PORT}/dbName`, {
+    useUnifiedTopology: true
+  });
+  try {
+    await client.connect();
+    await client
+      .db()
+      .collection("exampleCollection")
+      .insertOne({
+        someKey: "someVal"
+      });
+    const result = await client
+      .db()
+      .collection("exampleCollection")
+      .findOne({});
+    console.log(JSON.stringify(result));
+  } catch (e) {
+    console.error(e);
+  } finally {
+    await client.close();
+  }
+}
+
+main().catch(console.error);

mongodb/package.json

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+{
+  "dependencies": {
+    "mongodb": "^3.5.2"
+  }
+}