100% Private & Secure

CSV ↔ JSON
Converter

Convert CSV to JSON or JSON to CSV instantly. Paste your data, tweak delimiters, and get the result in one click — all processing happens on your device.

Bi-directional conversionCustom delimitersCopy or downloadNo upload required
Overview

What Is CSV ↔ JSON Conversion?

CSV (Comma-Separated Values) and JSON (JavaScript Object Notation) are two of the most common data interchange formats. CSV is tabular — rows and columns separated by a delimiter — while JSON is hierarchical, storing data as key-value pairs inside objects and arrays. Converting between them is a daily task for developers, analysts, and anyone moving data between spreadsheets, APIs, databases, and web applications.

Our CSV ↔ JSON Converter handles both directions instantly in your browser. Paste or upload your data, pick the delimiter, and get a clean result you can copy or download. The tool correctly handles quoted values with embedded commas, newlines, and escaped quotes following the RFC 4180 standard.

In CSV → JSON mode, the first row is treated as headers by default (toggleable), and each subsequent row becomes a JSON object. In JSON → CSV mode, the tool extracts all unique keys from every object in the array and uses them as column headers, so even inconsistent objects produce a complete table.

Everything runs on your device — no server upload, no data collection, no account required. Close the tab and nothing remains. The tool is free, works on desktop and mobile, and supports comma, semicolon, tab, and pipe delimiters for maximum flexibility.

Features

Discover Features

Bi-directional conversion, custom delimiters, drag-and-drop upload, and full privacy — all on your device

Bi-Directional Conversion

Switch between CSV → JSON and JSON → CSV with a single tab click. Both directions support custom delimiters, header options, and instant preview so you never have to leave the page.

Custom Delimiters

Choose from comma, semicolon, tab, or pipe as the CSV delimiter. This lets you work with international CSVs that use semicolons, tab-separated files, and pipe-delimited logs.

Privacy-First

Every conversion runs entirely in your browser. Your data is never sent to any server. Close the tab and nothing remains — ideal for sensitive or proprietary datasets.

Copy & Download

One-click copy to clipboard with visual feedback, plus a Download button that saves .json or .csv directly. No email, no sign-up, no waiting — the result is ready instantly.

File Upload & Drag-and-Drop

Paste text directly or drag and drop a .csv, .tsv, or .json file onto the input area. The tool reads the file locally and populates the input so you can convert immediately.

Input & Output Stats

See row count, column count, and object count before and after conversion. Output size is shown in KB so you know exactly what you are copying or downloading.

How to Convert

Four steps: paste or upload, choose options, convert, and copy or download

01
01

Paste or upload your data

Paste CSV or JSON text into the input area, or drag-and-drop a file. The tool auto-detects file type based on the active mode tab.

02
02

Choose direction & options

Pick CSV → JSON or JSON → CSV. Set the delimiter (comma, semicolon, tab, pipe), toggle "First row as headers" for CSV, or "Include headers" for JSON output.

03
03

Click Convert

Hit the Convert button. The tool parses your input, handles quoted values, and produces formatted output instantly — with error messages if something is wrong.

04
04

Copy or download the result

Review the output in the read-only preview. Click "Copy to Clipboard" for quick pasting, or "Download" to save as a .json or .csv file.

Use Cases

Common scenarios where CSV ↔ JSON conversion saves time and solves data compatibility issues

Database Import / Export

Export query results as CSV, convert to JSON for REST APIs or NoSQL imports. Or convert JSON API responses back to CSV for database bulk inserts.

Data Analysis & Spreadsheets

Convert JSON datasets from APIs into CSV to open in Excel, Google Sheets, or R. Quickly go from structured JSON to a tabular format for pivot tables and charts.

Web Development

Turn CSV config files or spreadsheet exports into JSON for use in JavaScript, React, or Node.js. Or convert JSON mock data to CSV for testing and seeding.

CRM & Marketing

Export contacts from CRM as JSON, convert to CSV for email campaign tools like Mailchimp. Or import CSV subscriber lists into systems expecting JSON payloads.

Log & Report Processing

Convert pipe-delimited or tab-separated log files to JSON for ingestion by monitoring tools. Or flatten JSON logs to CSV for human-readable reports.

Education & Research

Students and researchers can convert survey data or experiment results between CSV and JSON to match the format required by analysis tools, notebooks, or publications.

Compare Plans

Free vs Paid — CSV to JSON Converter

Get started free, upgrade when you need more power.

Feature
Free
Paid
Daily usage
5 uses/day
Unlimited
File size limit
10 MB
Up to 500 MB
All core features
No software installation
Works on any device
Files stay on your device
Batch processing
Priority support
Upgrade — starting at $4.99/mo
Upgrade to Full Version

Unlock the Full Power of CSV to JSON Converter

Remove daily limits, process larger files up to 500 MB, enable batch processing, and get priority support.

Buy Full Version — $4.99/moor $200 enterprise

Developer Tools includes:

  • 13 developer & utility tools
  • Unlimited daily uses
  • No file size limits
  • All output formats

Also available in the All Tools Bundle

FAQ

FAQ

Frequently asked questions about the CSV ↔ JSON Converter

Q1. What is CSV to JSON conversion?
CSV to JSON conversion takes a comma-separated (or other delimiter) text file and turns each row into a JSON object, using the header row as keys. The result is a JSON array of objects that can be used by APIs, databases, and web applications.
Q2. Is my data safe?
Yes. All conversion happens entirely in your browser using JavaScript. Nothing is sent to any server. Your data never leaves your device — close the tab and it is gone.
Q3. Can I use a semicolon or tab as the delimiter?
Yes. The delimiter selector supports comma, semicolon, tab, and pipe. Choose the one that matches your CSV format before converting. This works in both CSV → JSON and JSON → CSV directions.
Q4. What if my CSV has commas inside quoted values?
The parser handles RFC 4180-style quoting. Values wrapped in double quotes can contain commas, newlines, and escaped quotes (doubled ""). The parser strips the outer quotes and processes the value correctly.
Q5. Does JSON → CSV preserve nested objects?
The converter expects a flat array of objects (each value is a string, number, boolean, or null). Nested objects or arrays will be stringified as [object Object]. For nested JSON, flatten your data first before converting.
Q6. What happens if JSON objects have different keys?
The converter collects all unique keys from every object in the array and uses them as CSV column headers. If an object is missing a key, the corresponding cell is left empty.
Q7. Is there a file size limit?
There is no hard limit, but very large files (tens of megabytes) may slow your browser. For best performance, keep files under 10 MB. The tool processes everything on your device, so speed depends on your hardware.
Q8. Can I upload a file instead of pasting?
Yes. Click the "Upload file" link or drag-and-drop a .csv, .tsv, or .json file onto the input area. The file is read locally and populates the text area for conversion.
More tools

Related Tools

Convert data formats, then try these other utility tools

Excel ConverterImage ConverterPDF to TextPDF to ExcelAudio Converter