JSON to CSV Smart Mapper
Convert JSON to CSV online for free. Automatically flatten nested JSON objects using dot notation and download clean spreadsheets. No signup, instant download.
> Paste nested JSON. We will automatically flatten nested objects using dot notation (e.g. user.name) and convert arrays to semicolon-separated strings.
What is the JSON to CSV Smart Mapper?
Upload nested JSON, automatically flatten objects using dot notation, and export clean CSVs. Built for optimal performance, this tool executes client-side directly in your browser without uploading your sensitive data to external servers.
How to use the JSON to CSV Smart Mapper
- Paste your complex JSON payload into the input editor.
- Inspect the auto-extracted key hierarchy; map JSON property paths to custom CSV column headers.
- Choose flattening rules for nested objects and arrays.
- Download your customized, cleanly formatted CSV spreadsheet.
Example: Mapping Nested User Records to Flat CSV Columns
[{"id":1,"user":{"firstName":"Jane","lastName":"Doe"},"orders":[{"sku":"A1"}]}]id,first_name,last_name,order_count 1,Jane,Doe,1
Converts hierarchical JSON structures into flat tabular rows tailored for Excel or Google Sheets.
Technical Guide & Privacy Assurance
Use dot notation (e.g. `user.profile.avatar`) to extract deeply nested keys without writing custom transformation scripts.
Frequently Asked Questions
Can this tool handle nested JSON objects?+
Yes — nested objects are flattened using dot notation (e.g. user.address.city becomes a single column).
What's the maximum JSON file size supported?+
The tool runs entirely in your browser and can handle JSON files up to several MB without any upload limits.