How do I convert a CSV file to JSON online?

Paste or upload your CSV, confirm the detected delimiter, preview the JSON output, then copy or download it.

How does CSV to JSON conversion work?

The converter reads the first row as keys (unless you turn headers off) and turns every following row into a JSON object with those keys. The result is an array of objects, which is the shape most APIs and JavaScript code expect.

Does it handle commas inside values?

Yes. The parser follows standard CSV quoting rules, so a value wrapped in double quotes can contain commas, line breaks and even quotes (escaped by doubling them, ""), and it still lands in a single JSON field.

What if my file uses semicolons or tabs?

Many European Excel exports use semicolons, and data dumps often use tabs. Set the delimiter manually, or leave it on auto and the converter will detect the most likely delimiter from the first rows of your data.

Are numbers converted to JSON numbers?

Values that look like plain numbers are converted to JSON numbers, and true/false become booleans. Values with leading zeros, like ZIP codes or product codes, are kept as strings so no information is lost.

What happens with rows that have too few or too many fields?

Short rows are padded with empty values and the converter tells you which rows were affected. Extra fields are kept under generated keys so nothing is dropped silently.

DEVELOPER TOOLS · FREE ONLINE TOOL

CSV to JSON Converter

Turn CSV spreadsheets into JSON arrays instantlySpreadsheets and web applications speak different dialects of the same data: a CSV is rows and commas, a JavaScript app wants an array of objects. This converter bridges the two in one step: paste your CSV, get back JSON.

✓ Free to use✓ No sign-up✓ Ready in your browser

// CSV TO JSON CONVERTER · GET STARTED

Use CSV to JSON Converter

Turn CSV spreadsheets into JSON arrays instantly

CSV input

Or upload a .csv file (up to 10 MB)

DelimiterFirst row is headersConvert numbers and booleans

// CSV TO JSON CONVERTER · AT A GLANCE

CSV to JSON Converter: what to know first.

Turn CSV spreadsheets into JSON arrays instantly

01
CSV is how data leaves spreadsheets and legacy systems, but modern apps, APIs and JavaScript speak JSON. The CSV to JSON Converter makes the hop properly: a real CSV parser that respects quoted fields, embedded commas and line breaks inside values, escaped quotes and Windows or Unix line endings, instead of the naive split-on-comma approach that corrupts real files.
02
You control the details that usually break conversions: the delimiter (comma, semicolon, tab, pipe or auto-detect), whether the first row is a header, and sensible type handling that turns clean numbers and booleans into real JSON types while protecting values like leading-zero codes. Everything runs in your browser, so customer lists and internal exports never leave your machine.

// CSV TO JSON CONVERTER · HOW IT WORKS

How to use the CSV to JSON Converter

Add your CSV

Paste CSV data or upload a .csv file.

Check the settings

Confirm the delimiter and header settings.

Copy or download JSON

Copy the JSON array or download it as a .json file.

// CSV TO JSON CONVERTER · ABOUT THIS TOOL

About the CSV to JSON Converter

CSV is how data leaves spreadsheets and legacy systems, but modern apps speak JSON. This converter uses a real CSV parser that respects quoted fields, embedded commas, and line breaks.

You control the delimiter, header row, and type handling, and everything runs in your browser, so your data never leaves your machine.

Where it helps most

Where tabular data needs to enter code.

Database seed data

A product list exported from Excel becomes seed data for a storefront database in one step.

Mock APIs

A Google Sheets export turns into mock API responses for a prototype, so frontend work starts before the backend exists.

Survey results

Survey exports land in a format that charting libraries and analytics scripts accept directly, ready to visualize.

Legacy system imports

Generating a CSV import file for a legacy system that predates JSON entirely, no custom script needed.

Parsing done right

The details proper CSV parsing demands.

Quoted fields

Cells wrapped in quotes keep internal commas and line breaks as part of the value instead of splitting apart.

Stable columns

Empty cells become empty strings or nulls rather than shifting the columns that follow out of alignment.

Clean output tips

Delete trailing blank lines before converting, and remember CSV values start life as text, protecting zip codes and leading zeros.

CSV to JSON Converter: private by design

Conversion runs entirely in your browser. Your data never leaves your device, no signup needed.

// CSV TO JSON CONVERTER · COMMON QUESTIONS

CSV to JSON Converter FAQs

How does the converter decide the JSON property names?

The first row of your CSV becomes the keys. Each cell in that header row turns into a property name, and every data row below becomes an object using those names. Make sure the header row is clean and descriptive, since those names will appear throughout your code.

What happens when a cell contains a comma?

Why is there an empty object at the end of my JSON?

Will numbers and dates stay usable in the output?

Is my spreadsheet data uploaded to a server?

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