NDJSON to CSV Converter - Transform Newline Delimited JSON into CSV Format
Free online NDJSON to CSV converter for transforming Newline Delimited JSON data into CSV format. Automatically detects column headers from JSON keys, handles nested objects, and produces properly escaped CSV output for spreadsheets and databases.
Convert NDJSON format data into CSV (RFC 4180) for use with Excel, Google Sheets, SQL databases, and data analysis tools. Transform JSON Lines output into tabular comma-separated values.
How to Convert NDJSON to CSV
Transform Newline Delimited JSON into CSV for spreadsheets and data analysis
Input Your NDJSON Data
Paste your NDJSON data where each line is a JSON object. The converter will extract all unique keys as CSV column headers.
Example: NDJSON Input (Server Access Logs)
Each line is a JSON object representing an HTTP request log entry:
{"timestamp":"2024-01-15T10:30:00Z","method":"GET","path":"/api/users","status":200,"duration_ms":45} {"timestamp":"2024-01-15T10:30:05Z","method":"POST","path":"/api/orders","status":201,"duration_ms":120} {"timestamp":"2024-01-15T10:30:10Z","method":"GET","path":"/api/products","status":200,"duration_ms":38} {"timestamp":"2024-01-15T10:30:15Z","method":"DELETE","path":"/api/sessions/abc","status":204,"duration_ms":15}
Automatic CSV Generation
The converter automatically extracts headers and builds CSV rows following the CSV specification (RFC 4180):
Example: CSV Output
JSON keys become column headers, values become rows:
timestamp,method,path,status,duration_ms 2024-01-15T10:30:00Z,GET,/api/users,200,45 2024-01-15T10:30:05Z,POST,/api/orders,201,120 2024-01-15T10:30:10Z,GET,/api/products,200,38 2024-01-15T10:30:15Z,DELETE,/api/sessions/abc,204,15
Export Your CSV
Get the CSV data ready for your spreadsheet or database:
What is NDJSON to CSV Conversion?
NDJSON to CSV conversion transforms Newline Delimited JSON data into CSV (Comma-Separated Values) format. This is essential when you need to analyze streaming data, log files, or data pipeline output in spreadsheet applications like Microsoft Excel or Google Sheets.
The conversion process reads each JSON Lines record, extracts all unique keys as column headers, and maps values to their respective columns. This flattening process makes hierarchical JSON data accessible in tabular format for data analysis, reporting, and database import operations.
NDJSON data from tools like the Elasticsearch Bulk API, Google BigQuery exports, and structured logging systems can be easily converted to CSV for use with SQL databases, business intelligence tools, and data visualization platforms.
Common NDJSON to CSV Use Cases
Converting NDJSON to CSV bridges the gap between streaming data formats and traditional data analysis tools:
Log Analysis
Convert structured JSON log files from applications and servers into CSV for analysis in Excel or Google Sheets. Filter, sort, and chart your log data visually.
Best for: Server logs, application monitoring, error tracking
Database Import
Transform NDJSON exports from MongoDB, Elasticsearch, or BigQuery into CSV for importing into SQL databases like PostgreSQL, MySQL, or SQLite.
Best for: Data migration, ETL pipelines, reporting databases
Frequently Asked Questions
How are CSV headers determined?
Headers are automatically extracted from all unique JSON keys across all NDJSON lines, following the CSV specification (RFC 4180). If one object has keys that others don't, those columns will be empty for the other rows.
How are nested objects handled?
Nested objects and arrays are serialized as JSON strings in the CSV cell. This preserves all data while keeping the CSV structure flat and compatible with spreadsheet applications. For a visual view, try our NDJSON to Table converter.
Can I open the CSV in Excel?
Yes! Download the .csv file and open it directly in Microsoft Excel, Google Sheets, LibreOffice Calc, or any other spreadsheet application. The CSV format is universally supported.
What happens to invalid NDJSON lines?
Invalid lines and non-object values (like arrays or primitives) are skipped during conversion. The error count is displayed so you can review and fix any issues. Use our NDJSON Validator to identify problems.
What is the difference between NDJSON and JSON?
Standard JSON wraps multiple objects in an array with commas between them. NDJSON places each JSON object on its own line with no commas between lines. Use our JSON to NDJSON converter to transform between the two formats.
Can I convert NDJSON to other formats?
Yes! Besides CSV, you can convert NDJSON to a standard JSON array, view it as a sortable table, or inspect it with our NDJSON Viewer.
Is this converter free?
Yes, completely free with no limits. All processing happens in your browser — your data never leaves your device.
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