Convert JSON data to CSV format with nested object flattening. Free, private, runs in your browser.
100% private — your files never leave your browser. All processing happens locally on your device.
JSON (JavaScript Object Notation) is the standard data format for APIs, web applications, and configuration files. CSV (Comma-Separated Values) is the universal format for spreadsheets, databases, and data analysis tools. Converting JSON to CSV lets you open API responses in Excel, import web data into Google Sheets, or prepare datasets for tools like Tableau, Power BI, or pandas. The conversion flattens JSON's hierarchical structure into a flat, tabular format with rows and columns.
Many business tools and workflows require tabular data. When you receive data from an API, export from a NoSQL database, or download analytics data in JSON format, you often need to view, filter, or chart it in a spreadsheet. CSV bridges this gap — it's readable by Excel, Google Sheets, LibreOffice, database import tools, and virtually every data analysis platform. Converting JSON to CSV also makes data easier for non-technical stakeholders to review and understand.
Paste or upload your JSON data and the tool automatically detects the structure. Nested objects are flattened using dot notation — for example, an address object with a city field becomes 'address.city' as a column header. Arrays are joined into comma-separated strings within cells. You can configure the delimiter (comma, tab, semicolon, pipe), toggle header rows, and preview the output as a table before downloading. The conversion uses PapaParse, the industry-standard CSV library.
Completely. Your JSON data is processed entirely in your browser. Nothing is uploaded to any server. This is especially important for API responses, user data, and configuration files that may contain sensitive information. Close the page and all data is gone.
Nested objects are flattened using dot notation. For example, {"user":{"name":"Alice"}} becomes a column called 'user.name' with value 'Alice'.
Comma, tab, semicolon, and pipe. Choose the delimiter that matches your target application.
Yes. The tool shows a table preview of the first 20 rows before you download, so you can verify the output looks correct.
The tool processes everything in your browser, so it handles most JSON files easily. Very large files (10MB+) may take a few seconds.