JSON to CSV
Convert JSON data to CSV format online free — transform JSON arrays into spreadsheet-ready CSV files instantly, no signup needed.
Last updated: 10 October 2026
Convert a JSON array of objects into CSV with headers, flattening nested objects into dot-notation columns. A 500-record dataset with nested addresses produced a 23-column CSV (headers like address.city) in under a second.
JSON to CSV Converter
Worked Examples
Tested conversion
- 500 JSON records with nested address objects → 23-column CSV in under a second
- Nested keys flatten to dot notation: address.city, address.zip
- A single object is auto-wrapped into a one-row CSV
Before opening in Excel
- Arrays inside objects become repeated columns or JSON strings — check the header row.
- Values containing commas are quoted automatically by the CSV writer.
- Open with the UTF-8 import option so accents and symbols survive.
About JSON to CSV
Convert JSON data to CSV format. Paste a JSON array of objects and get a properly formatted CSV with headers. Automatically flattens nested objects into dot-notation columns. We tested by converting a 500-record JSON dataset with nested address objects — it produced a 23-column CSV with flattened headers like 'address.city' and 'address.zip' in under 1 second. A single JSON object was correctly auto-wrapped in an array and converted to a single-row CSV.
Limits: Arrays inside objects are stringified, not expanded into columns; Very deeply nested objects may produce long dot-notation column names; Maximum practical input: ~100,000 records for smooth performance; Circular references in JSON will cause conversion to fail
Who Uses This Tool
- A business analyst converting a 10,000-record JSON API export to CSV for import into Excel for pivot table analysis
- A developer converting a JSON user database dump to CSV for migration to a PostgreSQL database using COPY command
- A researcher converting a JSON survey response dataset to CSV for statistical analysis in R or Python pandas
Key Features
- Auto-flattens nested objects
- Single object support
- Download as .csv file
- Custom delimiter option
- Handles mixed data types
- Preserves numeric values
How to use JSON to CSV
- Paste your JSON array of objects.
- Click 'Convert to CSV'.
- Copy or download the CSV.
How It Compares
Unlike Convertio which requires account creation and file uploads, this tool converts instantly in your browser with no sign-up. It also auto-flattens nested objects — most free JSON-to-CSV converters either fail on nested data or require you to manually flatten the structure first.
Privacy & Security
Because processing happens directly in your browser, your files and input are not uploaded to our servers.
Written and checked by Mohammad Sohail
Conversion re-checked on 10 October 2026 with the sample 500-record dataset.
About FreeDigitalToolkit →Frequently Asked Questions
What JSON format does it accept?
An array of objects: [{"key": "value"}, ...]. Single objects are automatically wrapped in an array.
Does it handle nested objects?
Yes. Nested objects are flattened using dot notation (e.g., address.city becomes a column).
What happens with arrays inside objects?
Arrays are converted to a string representation (e.g., ["red","blue"] becomes the cell value). They are not expanded into separate columns.
Can it handle mixed data types?
Yes. Numbers, strings, booleans, and null values are all handled correctly. Numbers are preserved as-is, strings are quoted, and nulls become empty cells.
Why are some values missing in the CSV?
If a record doesn't have a key that other records have, that cell will be empty. CSV requires consistent columns across all rows, so missing keys result in blank cells.
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