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Bun

Bun

Running Bun scripts within Latenode for extended functionality.

Node Description

Notion image

The Bun runtime executes JavaScript code inside automation scenarios.

It is largely compatible with Node.js, but provides higher performance and additional built-in features such as SQLite, a fast package manager, and improved APIs.

In the low-code environment Bun works the same way as Node.js — through the JavaScript node, with a runtime switch available in settings.

Adding Code to a Scenario

To add Bun code:

  1. Add a JavaScript node to your scenario.
  1. In the node settings, switch the runtime to Bun.
  1. Edit the code template manually or with AI assistance.

Data Exchange Between Nodes

Using Data from Previous Nodes

You can access output data from previous nodes via the data object:

export default async function run({ data }) {
  const username = data["{{1.body.user}}"];
  return { user: username };
}

Passing Processed Data to Subsequent Nodes

Bun node can return strings, numbers, JSON objects or arrays.

export default async function run() {
  return {
    status: "ok",
    count: 42
  };
}

Using NPM Packages

Bun supports importing npm libraries with the import statement.

Dependencies are installed automatically after saving the scenario.

import axios from "axios";

export default async function run() {
  const response = await axios.get("https://api.github.com/repositories");
  return { total: response.data.length };
}
⚠️
Some libraries may behave differently in Bun than in Node.js. Always check compatibility.

Bun-Specific Features

SQLite Support

Bun provides a built-in bun:sqlite module:

import { Database } from "bun:sqlite";

export default async function run() {
  const db = new Database(":memory:");
  db.run("CREATE TABLE users (id INTEGER, name TEXT)");
  db.run("INSERT INTO users VALUES (?, ?)", [1, "Alice"]);

  const row = db.query("SELECT * FROM users").get();
  return { user: row };
}

Logging

Use console.log for debugging. Output will appear in the Log tab.

Limitations in Low-Code Environment

💡
The environment is isolated: listening to ports, running HTTP/WebSocket servers, or background daemons is not possible.
  • Maximum execution time: 2 minutes.
  • Only JavaScript is supported. TypeScript/JSX syntax (: type, interfaces, generics) is not available.
  • Use import instead of require.
  • Some Node.js core modules are not supported.
  • Not all npm packages are guaranteed to work.
  • Bun.serve and any server creation are not supported.
💡
You can chain multiple Bun nodes for more complex workflows, focusing on computations, API requests, and data transformations.
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Node.js Code examples