Which delimiters does the tool support?

Comma, semicolon, tab, and pipe are all supported, along with an auto-detect mode that sniffs the delimiter from your pasted or uploaded data.

How does auto-cast type detection work?

When auto-cast is enabled, values like 42 or 3.14 are converted to JSON numbers, and true/false become JSON booleans, instead of being left as plain text strings.

CSV to JSON Converter – Free Online with Auto-Repair & Table Preview

Q: Is the CSV to JSON converter free to use?

Yes, completely free. There are no limits, no accounts, no watermarks, and no charges. Convert as many CSV files as you need.

Q: Does my CSV data get uploaded to a server?

No. Parsing and conversion happen entirely in your browser using JavaScript. Your CSV never leaves your device, so it stays completely private.

Q: Can I choose which columns appear in the output?

Yes. After converting, the Output Format tab lists every detected column with a checkbox, so you can select or deselect columns before exporting.

Q: What happens if my CSV has errors or malformed rows?

The converter attempts to auto-repair common issues such as mismatched quotes or inconsistent column counts, and shows an Auto-Repair Log explaining exactly what was fixed.

💡All conversion happens in your browser — your data never leaves your device.

⚠️

🔧 Auto-Repair Log

📂

Drop a .csv file or click to browse

Accepts .csv and .tsv files up to 50 MB

Samples: 👥 Users 🛍️ Products 📦 Orders ; Semicolon

Paste CSV above and click Convert

✅ Converted —

Converting…

Rows

—

Columns

—

JSON Size

—

Delimiter

—

JSON Array Output

⚙️ Options

Delimiter

Parsing

First row is header

Auto-cast numbers

Auto-cast booleans

Trim whitespace

Skip empty rows

Null / Empty values

📤 Output Format

JSON Format

Wrap in envelope

Wrap in object key

Column selection

Convert a CSV to see columns.

ℹ️ About

Supported Input

✅ Comma-separated — standard CSV

✅ Semicolon-separated — European CSV

✅ Tab-separated — TSV files

✅ Pipe-separated — log-style data

✅ Auto-detect — sniffs the delimiter automatically

Type Casting

With Auto-cast enabled, values like 42, 3.14 become JSON numbers and true / false become JSON booleans.

Quoted Fields

Fields wrapped in "double quotes" are handled correctly, including fields that contain commas, newlines, or escaped quotes.

// Features Why Use I7 Pixel's Free CSV to JSON Converter?

Whether you're prepping data for an API, debugging a spreadsheet export, or building a quick prototype, I7 Pixel's CSV to JSON converter handles the messy parts of CSV — delimiters, quoting, type casting — entirely in your browser, with no upload and no signup.

🔍

Auto-Detect Delimiter

Comma, semicolon, tab, or pipe-separated files are recognized automatically, or you can force a specific delimiter from the Options panel.

🔢

Smart Type Casting

Numeric strings like 42 or 3.14 become JSON numbers, and true/false become JSON booleans — toggle this on or off as needed.

📋

Header Row Toggle

Use the first row as your object keys, or turn the toggle off if your CSV has no header and every row is pure data.

🧩

Quoted Field Handling

Fields wrapped in double quotes — including ones containing commas, line breaks, or escaped quotes — are parsed correctly every time.

✅

Column Selection

After converting, the Output tab lists every detected column with a checkbox so you can include or exclude columns from the final JSON.

📦

Multiple Output Formats

Export as a plain array, pretty-printed JSON, minified JSON, or wrapped inside a named object key like {"data": [...]}.

📊

Searchable Table Preview

Switch to Table Preview to browse your converted rows in a filterable grid before you copy or download the result.

🔧

Auto-Repair for Malformed Rows

Mismatched quotes and inconsistent column counts are detected and fixed automatically, with a log explaining exactly what changed.

🔒

100% Private — No Upload

All parsing and conversion happens locally in your browser using JavaScript. Your CSV data is never transmitted to any server.

// Guide How to Convert CSV to JSON Online — Step by Step

Converting a CSV file to JSON takes just four steps.

Paste or Upload Your CSV

Paste CSV data into the text box, or switch to the Upload tab and choose a .csv or .tsv file (up to 50MB).

Configure Conversion Options

Pick a delimiter, toggle header detection, enable auto-cast for numbers and booleans, and choose how empty values appear.

Click Convert to JSON

Press Convert to instantly generate a JSON array, with live stats on rows, columns, output size, and detected delimiter.

Copy, Download, or Preview

Use the JSON Output, Table Preview, or Pretty Print tabs to review the result, then copy it or download a .json file.

// Deep Dive Understanding CSV to JSON Conversion

A few key concepts help you get clean, predictable JSON output every time.

🗂️

From Rows and Columns to Objects and Keys

A CSV file is just rows of values separated by a delimiter. When "First row is header" is enabled, that row supplies the property names, and every following row becomes a JSON object — so a row like Alice,30,London under headers name,age,city becomes {"name":"Alice","age":30,"city":"London"}. The whole file becomes an array of these objects.

🧭

Choosing the Right Delimiter

Comma-separated is the most common format for English-locale exports, but spreadsheet tools in many European regions use semicolons so commas can be used as decimal points. Tab-separated (TSV) files are common for copy-pasting from spreadsheets, and pipe-separated data often comes from log files or legacy database exports. Auto-detect sniffs your data and picks the right one, but you can always force a specific delimiter if detection guesses wrong.

🔢

Type Casting — When to Leave Numbers as Text

Auto-cast turns numeric-looking strings into real JSON numbers and "true"/"false" into booleans, which is usually what APIs expect. But some values that look numeric — zip codes, phone numbers, account or ID numbers with leading zeros — lose meaning if cast to a number (a leading zero disappears). If your data includes these, turn auto-cast off, or deselect those columns before exporting.

// Reference JSON Output Format Comparison

Quick reference for choosing the right JSON output format for your use case.

Format	Example	Best Used For
Array of Objects Popular	[{"name":"Alice"}, {"name":"Bob"}]	APIs, databases, and most programmatic consumers — the default and most portable shape
Pretty-Printed Popular	Indented JSON with line breaks	Human review, documentation, debugging, and sharing readable output
Minified	Compact single-line JSON	Production payloads, smaller file size, copy-pasting into config files
Wrapped in Object	{"data": [...]}	APIs or tools that expect a named root key instead of a bare array

// Use Cases Who Converts CSV to JSON?

Turning spreadsheet exports into JSON is a routine task across development, data, and operations workflows.

💻

Web Developers

Convert spreadsheet exports into JSON fixtures for testing API endpoints, seeding databases, or mocking responses during development.

📊

Data Analysts

Turn CSV exports from BI tools or spreadsheets into JSON for use in scripts, notebooks, or dashboards that expect structured data.

🤖

No-Code Builders

Prepare JSON payloads from spreadsheet data to feed into automations in tools like Zapier, Make, or Airtable.

🧪

QA & Testers

Generate realistic mock JSON test data from spreadsheet-style records without writing conversion scripts.

🎓

Students & Researchers

Convert survey results or dataset exports from CSV into JSON for analysis tools and visualization libraries.

🛒

E-commerce Sellers

Convert product catalog spreadsheets into JSON for import scripts, storefront platforms, or marketplace integrations.

// FAQ Frequently Asked Questions

Answers to the most common questions about the CSV to JSON converter.

Yes — completely free. There are no limits, no accounts, no watermarks, and no charges. Convert as many CSV files as you need.

No — never. Parsing and conversion run entirely in your browser using JavaScript. Your CSV never leaves your device, so it stays completely private.

The converter supports comma, semicolon, tab, and pipe delimiters, plus an auto-detect mode that sniffs the delimiter from your pasted or uploaded data.

With auto-cast numbers and auto-cast booleans enabled, values like 42 or 3.14 become JSON numbers and true/false become JSON booleans instead of plain text strings.

Yes. After converting, the Output Format tab lists every detected column with a checkbox, so you can select or deselect columns before copying or downloading the JSON.

The converter attempts to auto-repair common issues like mismatched quotes or inconsistent column counts, and shows an Auto-Repair Log explaining exactly what was fixed.

// Reviews User Ratings & Feedback

Tried the tool? Leave a quick rating and help others find it.

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