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NDJSON to CSV
Combine strict flat JSONL object records into one CSV while preserving original numeric token text.
Pasted NDJSON, One UTF-8 NDJSON file
records.csv, ndjson-csv-report.json
Browser only
Runs locally in your browser. Your files, pasted content and generated output are not uploaded. Reset clears this tool’s working data.
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How to use this tool
- Enter the admitted input and explicit options described below.
- Select Convert NDJSON to CSV and inspect the stated conventions.
- Download the complete result and any companion report.
Examples
A number larger than 9007199254740991 keeps its exact original digits in the CSV text.
Limitations
- At most 1 MiB UTF-8, 10000flat object records, 200 columns, 200000 cells including headers and 200000cumulative JSON nodes, depth 40; 20 MiB combined output and 30 seconds.
- Require finalLF; CRLF and one initial BOM are admitted. Blank records, bareCR, record-prefix BOM, duplicate keys, nested arrays/objects and empty header names are refused.
- Missing and null values both become empty CSV text and are counted separately in the report. CSV does not preserve JSON types or the null/missing distinction. Spreadsheet formula protection is on by default.
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