JSON CSV Converter
Bidirectional conversion between JSON and CSV formats with nested object flattening and custom delimiters
About JSON-CSV Converter
JSON (JavaScript Object Notation) and CSV (Comma-Separated Values) are two commonly used formats for data exchange and storage.
This converter allows you to easily convert between JSON and CSV formats. It can handle nested objects, arrays, and various data types, making data conversion quick and simple.
Key Features
Supported JSON Formats
Common Use Cases
Best Practices
Appropriately Flatten Nested Objects
Enable "Flatten Nested Objects" to convert nested JSON into flat CSV columns using dot notation (e.g., 'address.city'). For simple structures, disable this option to keep output cleaner.
Validate JSON Before Conversion
First use a JSON validator to ensure your JSON format is correct. Invalid JSON will cause difficult-to-diagnose conversion errors.
Handle Arrays in Values
Arrays as values will become JSON strings in CSV. If you need each array item on a row, preprocess JSON to flatten arrays first.
Use Appropriate Delimiter
If your data contains commas, use semicolon or tab delimiter. In European regions where commas are used as decimal separators, semicolons are preferred.
Troubleshooting
Why are some columns missing?
CSV uses the keys of the first object as headers. If subsequent objects have additional keys, these columns won't appear. Ensure all objects have consistent keys.
Why does [object Object] appear in CSV?
Unflattened nested objects become string representations. Enable "Flatten Nested Objects" or preprocess JSON to remove nesting.
Why does CSV to JSON produce empty array?
Check if your CSV has content and if the correct delimiter is selected. Empty lines or delimiter mismatches can cause silent parsing failures.
How to handle CSV with different data types?
CSV to JSON treats all values as strings by default. For numbers, booleans, or null values, you may need to post-process the JSON output.
Frequently Asked Questions
Is my data secure?
Yes, absolutely secure. The conversion process runs entirely in your browser using JavaScript. Your JSON and CSV data are never sent to our servers.
Can I convert nested JSON objects?
Yes. Enable the "Flatten Nested Objects" option to convert nested structures into flat CSV columns (e.g., 'user.address.city').
How to open CSV in Excel?
Simply click "Download" to get the .csv file, which can be opened directly in Microsoft Excel, Google Sheets, or Apple Numbers.
Can CSV be converted back to JSON?
Yes! Just switch to "CSV → JSON" mode, paste your CSV data, and click the convert button.
What delimiters are supported?
Comma (,), semicolon (;), tab, and pipe (
Is there a file size limit?
Since it runs in the browser, the limit depends on your computer's memory. Usually can easily handle files of several megabytes.