Data Format Converters

These converters handle the data formats you deal with every day: CSV, JSON, XML, YAML, and Excel. Everything runs in your browser tab with JavaScript, so your data stays on your machine. No server involved.

When you actually need these

You pulled an API response in JSON and someone on the team needs it in a spreadsheet. Or you exported a CSV from a database and now the frontend wants JSON. Maybe you are migrating config files from XML to YAML because your new CI pipeline expects it. These are the kinds of things that come up constantly, and writing a quick script every time gets old.

The data format converters handle each of these. Drop a file or paste the content directly, and you get the output in the target format. For Excel files, we use SheetJS to read and write the Office Open XML format entirely client side.

Quick format rundown

CSV is the universal export. Every database, spreadsheet app, and reporting tool can produce one. JSON is what APIs speak. If you are building anything for the web, you are working with JSON. XML still shows up in enterprise integrations, SOAP services, and Android resource files more than people expect. YAML is everywhere in DevOps: Docker Compose files, Kubernetes manifests, GitHub Actions workflows. And XLSX is what you send to people who live in Excel, which honestly is most of the business side.

Popular conversions

• CSV to JSON for getting spreadsheet exports into web apps
• JSON to CSV when you need API data in Excel
• YAML to JSON for parsing config files programmatically
• JSON to YAML to make structured data readable for config files
• XLSX to CSV to pull data out of Excel into something portable
• XML to JSON for feeding legacy system output into modern code

A note on privacy

Data files tend to contain real records. Customer emails, financial figures, API keys sitting in config files. Most online converters upload your file to their servers for processing. Here, parsing and serialization happen in your browser tab with JavaScript. You can open the Network tab in DevTools during a conversion and you will see zero outbound requests. Worth doing once if you are evaluating this for work.