How do I convert JSON to CSV format?

Simply paste your JSON data into the input field and click 'Convert to CSV'. The tool automatically parses your JSON structure and generates a CSV file with headers from your JSON keys. For nested objects, the converter flattens the structure using dot notation (e.g., 'user.address.city'). Arrays are also flattened or expanded into separate columns depending on the conversion settings. You can then download the CSV file for use in Excel, Google Sheets, or any spreadsheet application.

Can this tool handle nested JSON structures?

Yes! Our converter intelligently handles nested JSON objects and arrays. When converting to CSV, nested objects are flattened using dot notation, so a JSON structure like {user: {name: 'John', age: 30}} becomes columns 'user.name' and 'user.age' in the CSV. Arrays can be handled in multiple ways: flattened into indexed columns (item.0, item.1), joined as comma-separated values, or expanded into multiple rows. This flexibility ensures your complex data structures convert cleanly.

What CSV delimiters are supported?

The tool supports all common CSV delimiters including comma (,), semicolon (;), tab, and pipe (|). You can also specify custom delimiters for specialized use cases. Comma is the default and most widely compatible delimiter for tools like Excel and Google Sheets. Semicolon is common in European locales where comma is used as the decimal separator. Tab-delimited files (TSV) are useful for data with many commas in the text content.

How do I convert CSV back to JSON?

Paste your CSV data into the input field and select 'Convert to JSON'. The converter reads the first row as headers (column names) and creates JSON objects where each header becomes a key. You can choose between array of objects format (most common) or object of objects format. The tool automatically detects data types and converts numeric strings to numbers and 'true'/'false' strings to booleans. For flattened data with dot notation, you can optionally reconstruct the nested structure.

Are my data files secure when using this converter?

Absolutely! All conversion happens entirely in your browser using JavaScript. Your CSV and JSON files are never uploaded to any server, transmitted over the internet, or stored anywhere except temporarily in your browser's memory. This makes it completely safe to convert sensitive business data, customer information, or proprietary datasets. Once you close the browser tab, all data is immediately cleared from memory. No server logs, no data retention.

What's the maximum file size I can convert?

Since the conversion runs in your browser, the limit depends on your device's available memory. Most modern browsers can handle files up to 50-100MB (hundreds of thousands of rows) without issues. For extremely large datasets (1GB+), you might experience slower performance or need to use command-line tools. The browser-based approach provides instant conversion for typical use cases while ensuring your data privacy and avoiding upload times.

How does the tool handle data type conversion?

When converting CSV to JSON, the tool attempts to preserve data types intelligently. Numeric values like '123' or '45.67' are converted to JSON numbers, not strings. Boolean values 'true' and 'false' become actual booleans. Empty values can be treated as null, empty strings, or omitted entirely based on your settings. When converting JSON to CSV, all values are converted to strings as per CSV format, but the original types are preserved through formatting (e.g., numbers without quotes).

What are common use cases for JSON-CSV conversion?

Converting API responses (JSON) to CSV for analysis in Excel or Google Sheets is extremely common. Data analysts convert CSV exports from databases to JSON for web application consumption. Migrating data between systems often requires format conversion. Developers use it to create test fixtures by converting spreadsheet data to JSON. Business users convert JSON logs or reports to CSV for sharing with non-technical stakeholders. ETL (Extract, Transform, Load) pipelines frequently need bidirectional JSON-CSV conversion.

How do I handle CSV files with quotes and special characters?

The converter properly handles CSV quoting and escaping according to RFC 4180 standards. Fields containing delimiters, line breaks, or quotes are automatically wrapped in double quotes. Embedded quotes are escaped by doubling them (e.g., 'He said "Hello"' becomes '"He said ""Hello""'). This ensures data integrity when converting to JSON and back. The tool also handles UTF-8 encoding, so international characters, emoji, and special symbols are preserved correctly.

Can I customize the JSON output structure?

Yes! You can choose between several JSON output formats: array of objects (most common for APIs), object of objects (keyed by an ID column), or an object with separate keys for headers and data rows. You can also control whether to reconstruct nested objects from dot notation (e.g., 'user.name' becomes {user: {name: value}}), whether empty values should be null or omitted, and whether to preserve numeric precision for financial data. These options make the tool flexible for any integration scenario.

JSON to CSV Converter

Convert between JSON and CSV formats instantly. Support for nested structures, arrays, and custom delimiters. Perfect for data analysis and API integration.

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