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Version: 2.5.1

JavaScript quick start

At the end of this guide, you will have created a simple JavaScript Hello, World! program that connects to the Memgraph database and executes simple queries.

note

Running queries directly from a web browser is not recommended because of additional requirements and possible performance issues. In other words, we encourage you to use server-side libraries and clients for top performance whenever possible.

Prerequisites​

To follow this guide, you will need:

  • A running Memgraph instance. If you need to set up Memgraph, take a look at the Installation guide.
  • A basic understanding of graph databases and the property graph model.

Basic Setup​

Let's jump in and connect a simple program to Memgraph.

1. Create a new directory for your application, for example /MyApp and position yourself in it.

2. To make the actual program, create a program.html file and add the following code:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>Javascript Browser Example | Memgraph</title>
    <script src="https://cdn.jsdelivr.net/npm/neo4j-driver"></script>
  </head>
  <body>
    <p>Check console for Cypher query outputs...</p>
    <script>
      const driver = neo4j.driver(
        "bolt://localhost:7687",
        neo4j.auth.basic("", "")
      );

      (async function main() {
        const session = driver.session();

        try {
          await session.run("MATCH (n) DETACH DELETE n;");
          console.log("Database cleared.");

          await session.run("CREATE (alice:Person {name: 'Alice', age: 22});");
          console.log("Record created.");

          const result = await session.run("MATCH (n) RETURN n;");

          console.log("Record matched.");
          const alice = result.records[0].get("n");
          const label = alice.labels[0];
          const name = alice.properties["name"];
          const age = alice.properties["age"];

          if (label != "Person" || name != "Alice" || age != 22) {
            console.error("Data doesn't match.");
          }

          console.log("Label: " + label);
          console.log("Name: " + name);
          console.log("Age: " + age);
        } catch (error) {
          console.error(error);
        } finally {
          session.close();
        }

        driver.close();
      })();
    </script>
  </body>
</html>

3. Open the program.html file in your browser and look for the output in the console.

You should see an output similar to the following:

Database cleared.
Record created.
Record matched.
Label: Person
Name: Alice
Age: 22

Where to next?​

For real-world examples of how to use Memgraph, we suggest you take a look at the Tutorials page. You can also browse through the How-to guides section to get an overview of all the functionalities Memgraph offers.