Convert API and structured JSON data into spreadsheet-friendly CSV.
Local developer data tool
Turn arrays of objects into CSV, flatten nested fields with dot notation, and download with selected inputs processed locally in your browser.
Rows: 0 · Fields: 0 · Input size: 0 B
Turn arrays of objects into CSV, flatten nested fields with dot notation, and download with selected inputs processed locally in your browser.
Selected file contents are processed locally in your browser for supported workflows. This privacy build does not intentionally load ads, analytics, remote fonts, or third-party runtime scripts.
Use the controls on this page, review the output in your browser, then copy or download the result.
JSON is common in APIs and developer tools, while CSV is easier to inspect in spreadsheet apps and data-cleaning workflows.
This converter supports JSON objects and arrays of objects. Nested objects are flattened with dot notation so nested data is visible instead of silently discarded.
Yes. You can paste, convert, copy, and download CSV without signup.
No. JSON files are read and converted locally in your browser.
Arrays of objects work best. A single object is converted into one CSV row.
Nested keys are flattened with dot notation, such as profile.name.
Yes. UTF-8 text, accents, Asian scripts, and emojis are preserved in CSV output.
Privacy build: This build removes ads, analytics, remote fonts, runtime CDN scripts, and file-operation telemetry. Selected files are processed in the browser using local JavaScript and browser APIs.
ConvertUnlimited does not provide a server-side upload endpoint for this JSON to CSV conversion flow. Selected JSON files are processed locally in your browser.
ConvertUnlimited is provided as is. Review generated CSV before using it in production systems.
Files are processed locally where supported. Review the Trust Center for the processing model and the Privacy Policy for public-site privacy boundaries.