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Bruno allows you to load any npm module or package for use in your scripting workflows.
Always turn on Developer Mode when using external libraries in Bruno.

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Prerequisites

Before you begin, ensure that you have the following:
  1. Node.js installed on your system.
  2. Bruno installed.

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Project structure

The folder structure for this example will look like this:
bruno-collection
external-lib
echo-api.bru
auth.bru
data.csv
package.json
bruno.json
.gitignore
node_modules

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Configuration

You need a package.json file at the root of your Bruno collection.
  1. Open your collection folder in Bruno or in an editor such as VS Code.
  2. Open the integrated terminal (in Bruno or your editor) and go to the collection root:
cd path/to/your/bruno-collection
  1. Initialize package.json:
npm init -y
  1. Install the package (run this in the same terminal, from the collection root):
npm install csv-parse
  1. Confirm csv-parse appears under dependencies in package.json, for example:
"dependencies": {
  "csv-parse": "^6.2.1"
}
Exact versions may differ; what matters is that the dependency is listed after a successful install.
  1. In Bruno, enable Developer Mode for the collection so require() can load packages from node_modules.

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Example: Parse CSV with csv-parse

This example uses csv-parse ↗ to turn CSV text into JavaScript objects, then sends the first row as JSON on the request. See the npm package page ↗ for options, streaming APIs, and more. Use a Pre Request script with Developer Mode on: 
const { parse } = require('csv-parse/sync');

const csvData = `name,email
Smith,smith@example.com
John,john@example.com`;

const records = parse(csvData, {
  columns: true,
  skip_empty_lines: true
});

req.setHeader('Content-Type', 'application/json');
req.setBody(records[0]);
Bruno Pre Request script using an external library (csv-parse) records[0] is the first data row as an object (for example { name: 'Smith', email: 'smith@example.com' }) because columns: true uses the first line as headers.

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Reading CSV from a file

You can also pass CSV from a file in your collection (path is relative to the collection root): 
const fs = require('fs');
const path = require('path');
const { parse } = require('csv-parse/sync');

const csvData = fs.readFileSync(path.join(__dirname, 'data.csv'), 'utf8');
const records = parse(csvData, {
  columns: true,
  skip_empty_lines: true
});

req.setHeader('Content-Type', 'application/json');
req.setBody(records[0]);
Adjust the path to match where you store your .csv file.