CSV to JSON

What this tool does

This tool converts CSV data into JSON, the format that code and web services speak. Paste your CSV or upload a file, and it turns your rows and columns into clean, formatted JSON you can copy straight into a project. It all runs in your browser, so your data is never uploaded.

How to use it

1. Paste your CSV into the box, or upload a .csv file.
2. Press Convert to generate the JSON.
3. Use Copy to grab the result. Reset clears the box to start over.

How it works

The tool parses your CSV with PapaParse, a well-established CSV library, and turns each line into an array of its values, then formats the whole thing as neatly indented JSON. The first array holds your header row, and each array after it is one row of data, so the structure mirrors the original table exactly. Everything happens on your device, with nothing sent to a server.

A worked example

Take this CSV:

name,age,city
Alice,30,London
Bob,25,Paris

The tool turns it into an array of rows, with your headers as the first row:

[
  [
    "name",
    "age",
    "city"
  ],
  [
    "Alice",
    "30",
    "London"
  ],
  [
    "Bob",
    "25",
    "Paris"
  ]
]

Each row becomes an array of values, which keeps the grid intact. If your project instead needs objects keyed by column name, like {"name": "Alice", "age": "30"}, that is a slightly different shape you can build by pairing each row against that first header array. Note too that values come through as text, so a number like 30 arrives as the string "30".

What JSON is, and when you need it

JSON, short for JavaScript Object Notation, is the common language of data on the web. It is lightweight, easy for both people and machines to read, and it is what most APIs return, what JavaScript and web apps work with naturally, what countless config files are written in, and what many modern databases store. If CSV is the format of spreadsheets, JSON is the format of code.

So you reach for this conversion whenever spreadsheet data needs to become something a program can use: feeding a list of records into a web app, preparing data to send to or mock an API, seeding a database, or turning an export from a tool into structured input for a script. It is the bridge from the world of rows and columns to the world of software. To target a different format, the CSV to XML tool produces XML, and CSV to Excel builds a spreadsheet.

Questions people ask