How to Convert Excel Files to CSV and JSON Programmatically

Excel files are everywhere. But most programs work better with CSV or JSON. Here's how to bridge the gap.

Method 1: CLI (Fastest)

npm install -g csv-toolkit-pro

# Excel to CSV
csv-toolkit-pro convert input.xlsx -o output.csv

# Excel to JSON (via CSV)
csv-toolkit-pro convert input.xlsx -o temp.csv
csv-toolkit-pro convert temp.csv -o output.json

Method 2: REST API

npm install -g csv-api
csv-api --port 3000 &

curl -X POST http://localhost:3000/convert   -F "file=@report.xlsx"   -F "format=csv"

Method 3: Programmatic

const csvToolkit = require('csv-toolkit');

// Convert Excel to CSV
csvToolkit.convert('report.xlsx', 'report.csv');

One-Liner Conversion

# Convert all Excel files in a folder
csv-toolkit-pro convert ./excel_files/*.xlsx -o ./csv_files/

Supported Formats

csv-toolkit supports:

• .xlsx (Excel 2007+)
• .xls (Excel 97-2003)
• .csv
• .tsv
• .json

Install

npm install -g csv-toolkit-pro

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