Convert JSON to CSV Online For Free

Paste JSON or upload a file and convert it to CSV instantly. No upload needed — runs in your browser.

JSON Input Upload .json file

Options

Delimiter

*All processing happens in your browser. No files are uploaded to any server.

How to Convert JSON to CSV

Paste your JSON data into the text area or upload a .json file.
Choose your preferred delimiter: comma, semicolon, or tab.
Click "Convert to CSV" to process the data.
Preview the first few rows to verify the output.
Download your CSV file using the download button.

Why Use Our JSON to CSV Converter?

A simple, private, and fast way to transform JSON data into spreadsheet-ready CSV files.

100% Private

Your data never leaves your device. All conversion happens locally in your browser — nothing is uploaded to any server.

Nested Object Support

Handles nested JSON objects by flattening them with dot notation. Complex structures become clean, readable columns.

Custom Delimiters

Choose between comma, semicolon, or tab delimiters to match your regional format or application requirements.

Instant Preview

See a preview of your converted data before downloading. Verify the output looks correct with a quick glance.

Instant Processing

No waiting for server-side processing. Conversion starts immediately in your browser and finishes in milliseconds.

No Signup Required

Use the converter right away — no account, no email, no signup. Completely free with unlimited conversions.

Why Convert JSON to CSV?

JSON (JavaScript Object Notation) is the standard data format for APIs and web applications, but it is not ideal for spreadsheet analysis or data reporting. CSV (Comma-Separated Values) is the universal format for spreadsheets, databases, and data analysis tools like Excel, Google Sheets, and Tableau.

Converting JSON to CSV allows you to quickly analyze API responses, export database records, or prepare data for import into business intelligence tools. Our converter handles nested objects by flattening them with dot notation, so complex JSON structures become clean, tabular data.

This tool processes everything in your browser — your data never leaves your device. This makes it safe for sensitive business data, personal information, or any JSON payload you need to transform into a spreadsheet-friendly format.

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JSON to CSV Converter FAQs

Common questions about converting JSON to CSV

What JSON structures are supported?

This tool works best with JSON arrays of objects (e.g., [{...}, {...}]). Each object in the array becomes a row in the CSV, and the object keys become column headers. Single objects are also supported and will produce a one-row CSV.

How are nested objects handled?

Nested objects are flattened using dot notation. For example, {"address": {"city": "NYC", "zip": "10001"}} becomes two columns: "address.city" and "address.zip". This works for multiple levels of nesting.

What happens if objects have different keys?

The converter collects all unique keys across every object in the array. If an object is missing a key, that cell will be empty in the CSV output. This ensures no data is lost.

Can I convert large JSON files?

Yes, since processing happens in your browser, it can handle reasonably large files. Performance depends on your device, but files up to 10-20MB typically convert smoothly. For very large datasets, consider splitting them first.

What delimiter should I choose?

Comma is the standard CSV delimiter and works with most applications. Use semicolon if your data contains commas or if your locale uses commas as decimal separators (common in Europe). Tab-delimited files work well for pasting into spreadsheets.

How are special characters handled?

Values containing the delimiter character, double quotes, or newlines are automatically wrapped in double quotes following the RFC 4180 CSV standard. Double quotes within values are escaped by doubling them.

Can I upload a .json file instead of pasting?

Yes! Click the "Upload .json file" link above the text area to select a file from your device. The file contents will be loaded into the editor where you can review them before converting.

Are my data uploaded to a server?

No. All conversion happens 100% in your browser using JavaScript. Your data never leaves your device, making this tool completely private and secure. There are no uploads, no cloud processing, and no data collection.

How do arrays within objects get handled?

Array values are converted to a string representation joined by a pipe character (|). For example, {"tags": ["html", "css"]} becomes "html|css" in the CSV cell.

Which browsers support this converter?

This tool works in all modern browsers including Chrome, Firefox, Safari, and Edge. It uses standard JavaScript APIs with no external dependencies.

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