CSV to JSON/Excel Converter

Convert CSV data to JSON or download it as an Excel spreadsheet. Paste content directly or upload a CSV file.

Paste CSV Content

Upload CSV File

What Is CSV?

CSV (Comma-Separated Values) is one of the oldest and most widely supported data exchange formats. Each line represents a record, and fields within a record are separated by commas. Despite its simplicity, CSV is described in RFC 4180 which defines rules for quoting, escaping, and header rows.

CSV files can be opened in virtually every spreadsheet application (Excel, Google Sheets, LibreOffice Calc), imported into databases, and parsed by every major programming language. This universality makes CSV the go-to format for data export, migration, and interchange between systems that don't share a common API.

Why Convert CSV?

CSV → JSON: Transform tabular data into structured JSON for REST APIs, NoSQL databases, or front-end applications.
CSV → Excel: Create properly formatted .xlsx files with column types, filtering, and formatting that raw CSV lacks.
Data Migration: Export data from one system as CSV, convert it, and import it into another system in the required format.
Reporting: Convert API response data (JSON) back to CSV for stakeholders who prefer spreadsheets.

How to Use This Tool

Paste CSV: Copy your CSV data into the text area on the left.
Check "First row is header" if the first line contains column names (this creates named JSON keys instead of array indices).
Click Convert to JSON to see the output, or Download as Excel to get an .xlsx file.
Alternatively, upload a CSV file using the file upload card and choose your output format.

CSV Format Rules

Rule	Example
Fields separated by commas	`Alice,30,Engineer`
Text fields with commas must be quoted	`"Smith, John",42,Manager`
Quotes inside quoted fields are doubled	`"She said ""hello""",1`
Each record is one line (CRLF or LF)	One row per `\n`
Optional header row	`Name,Age,Role`
Empty fields are valid	`Alice,,Engineer`

CSV vs JSON vs Excel

Feature	CSV	JSON	Excel (.xlsx)
Structure	Flat (rows & columns)	Nested (objects & arrays)	Flat with sheets
Data Types	Everything is text	String, number, boolean, null	Rich types + formatting
File Size	Very small	Small–medium	Larger (compressed XML)
Human Readable	Yes	Yes	Requires Excel/viewer
Formulas/Charts	No	No	Yes
Universal Support	Excellent	Excellent	Good (needs Office/lib)

Why Use This Tool?

Convert CSV to JSON, XML, or other formats instantly.
Handles complex CSV with quoted fields and delimiters.
Perfect for data migration and API integration.
All processing happens in your browser.

Frequently Asked Questions

No. CSV is inherently flat — each row has the same number of fields. To represent nested data, you must either flatten it (repeating parent values on each child row) or switch to a format like JSON or XML that supports nesting natively. This tool converts flat CSV to a JSON array of objects, one per row.

Many European locales use semicolons (;) as the delimiter because commas are used as decimal separators. This tool currently expects comma-delimited input. If your CSV uses semicolons, do a find-and-replace to convert semicolons to commas before pasting, or check that your export settings use commas.

Ensure your CSV file is saved with UTF-8 encoding. Many spreadsheet applications default to locale-specific encodings (e.g., Windows-1252) which can corrupt non-Latin characters. In Excel, use "Save As → CSV UTF-8 (Comma delimited)". For character encoding tools, try our Unicode Converter.