CSV ↔ JSON Converter Convert CSV files to JSON and vice versa in seconds. Easily transform your data between formats with support for bulk uploads, headers, and nested data structures. Quick Start

Step 1: Paste or upload your CSV or JSON data into the input field Step 2: Select the conversion direction (CSV → JSON or JSON → CSV) Step 3: Click the "Convert Now" button to process your data Step 4: Copy, preview, or download your converted output

Features Free Features

Bidirectional Conversion: Convert CSV to JSON and JSON back to CSV seamlessly Smart Type Detection: Automatically detects and converts numbers, booleans, and null values Pretty Print JSON: Format JSON output with indentation for better readability Instant Processing: Fast conversion with real-time results Up to 50 Daily Conversions: Free tier includes 50 conversions per day

Pro Features

Bulk CSV Upload: Process hundreds or thousands of rows at once Unlimited Daily Conversions: No limits on how many times you can convert Export to Multiple Formats: Download results as CSV, JSON, or TXT Conversion History: Access your past conversions anytime Priority Processing: Faster processing times for bulk operations API Access (Ultimate tier): Integrate conversions into your applications

How to Use Single Conversion

Navigate to the main conversion form Choose your conversion direction from the dropdown Paste your CSV or JSON data into the text area Optionally enable "Pretty Print JSON" for formatted output Click "Convert Now" and view your results instantly Use the "Copy to Clipboard" button to copy the output

Bulk Upload (Pro Feature)

Go to the "Bulk Upload" tab Download the CSV template to see the required format Prepare your CSV file with columns: conversion_type and data_input Drag and drop your file or click to browse Click "Process Bulk Upload" to convert all rows Download results as CSV or JSON

CSV Format for Bulk Processing Your bulk upload CSV should have these columns:

conversion_type: Either "csv_to_json" or "json_to_csv" data_input: The data to convert (properly escaped)

Example: conversion_type,data_input csv_to_json,"name,age\nMario,41\nSue,40" json_to_csv,"[{\"name\":\"John\",\"city\":\"NY\"}]"

FAQ

Q: Does this support nested JSON?

A: Yes, nested JSON objects are automatically flattened when converting to CSV. For example, {"user": {"name": "John", "age": 30}} becomes columns user.name and user.age in the CSV output.

Q: Can I upload files?

A: Yes. You can upload CSV or JSON files directly through the file upload interface. The tool will automatically detect the file type and process it accordingly.

Q: What's the maximum file size?

A: Free users can process up to 100,000 characters per conversion. Pro users have increased limits for larger datasets.

Q: How are data types handled?

A: When converting CSV to JSON, the tool automatically detects and converts: - Numbers (integers and floats) - Booleans (true/false) - Null values - Strings (everything else)

Q: Can I convert JSON arrays with different structures?

A: Yes. When converting JSON to CSV, all unique keys across all objects are extracted as columns. Missing values are represented as empty cells.

Q: Is my data secure?

A: All conversions happen server-side with secure connections. We don't permanently store your data unless you're a Pro user with history enabled (which you can delete anytime).

Examples

Example 1: CSV → JSON

Input (CSV): name,city,age Mario,Montreal,41 Sue,Toronto,40 Output (JSON): json[ { "name": "Mario", "city": "Montreal", "age": 41 }, { "name": "Sue", "city": "Toronto", "age": 40 } ] Example 2: JSON → CSV Input (JSON): json[ {"name": "John", "country": "USA", "active": true}, {"name": "Jane", "country": "Canada", "active": false} ] Output (CSV): "name","country","active" "John","USA","true" "Jane","Canada","false" Example 3: Nested JSON → CSV Input (JSON): json[ {"user": {"name": "Alice", "email": "alice@example.com"}, "score": 95}, {"user": {"name": "Bob", "email": "bob@example.com"}, "score": 88} ] Output (CSV): "user.name","user.email","score" "Alice","alice@example.com","95" "Bob","bob@example.com","88" Troubleshooting Problem: "CSV must have valid headers" error Solution: Ensure your CSV has a header row as the first line. Headers cannot be empty.

Problem: "Invalid JSON" error Solution: Validate your JSON using a JSON validator. Common issues include missing quotes, trailing commas, or unescaped special characters.

Problem: Conversion result looks incorrect Solution: Check that your input data is properly formatted. For CSV, ensure proper comma separation and quote escaping. For JSON, ensure it's a valid JSON array of objects.

Problem: Daily limit reached Solution: Free users are limited to 50 conversions per day. Sign up for a Pro account for unlimited conversions.

Problem: Bulk upload fails Solution: Verify your CSV matches the template format. Ensure data is properly escaped, especially quotes and newlines within cells.

Need more help? Contact our support team or visit our documentation.