One export instead of manual copying
Select files that represent the same kind of record, such as daily API exports, order batches or downloaded reports. Their rows are appended into one CSV.
- JSON arrays
- JSONL and NDJSON
- One shared CSV header
Multiple JSON files
Merge multiple JSON files into one CSV
Choose or drop several JSON files together. The converter combines their records, discovers columns across the batch and creates one CSV with a single header row.
Columns are discovered across files
If later files contain additional fields, those paths are included in the field picker. Missing values remain blank in rows that do not contain that field.
Files stay on your device
Every selected source file is read locally in the browser. The batch is not uploaded to an application server for conversion.
Common questions
Do all JSON files need exactly the same columns?
No. The converter discovers the union of fields across the selected files. For the cleanest result, the files should still represent the same general kind of record.
Can I combine JSONL or NDJSON files too?
Yes. You can select a mixture of supported JSON arrays, JSONL, NDJSON and common object-wrapped record files.
Will the CSV repeat the header for every file?
No. The combined download contains one header row followed by the records from each selected file.