JSONL to CSV Converter
Convert JSONL (JSON Lines) to CSV format instantly. Automatically extracts columns from JSON keys. 100% client-side.
Input JSONL
Drop a .jsonl file here, or click to browse
Supports .jsonl, .ndjson, .json, .txt
Output CSV
Paste or drop JSONL content to convert
How to Convert JSONL to CSV
JSONL to CSV conversion extracts all unique keys from your JSON objects and uses them as CSV column headers. Each JSON object becomes one row in the CSV output.
Nested objects are flattened using dot notation. For example, {"address":{"city":"NYC"}} becomes a column named "address.city". Arrays are serialized as JSON strings in the CSV cell.
Our converter handles mixed schemas gracefully. If different JSONL lines have different keys, all unique keys are collected as columns, and missing values are left empty.
What is JSONL to CSV Conversion?
JSONL to CSV conversion transforms newline-delimited JSON objects into a tabular format that spreadsheet applications like Excel and Google Sheets can open directly. Each JSON key becomes a column header, and each line becomes a row.
This conversion is essential for data analysts who work with JSONL data exports from APIs, databases, or machine learning pipelines and need to analyze the data in spreadsheet tools or import it into SQL databases.
Common Use Cases
Spreadsheet Analysis
Open JSONL data in Excel or Google Sheets for sorting, filtering, and creating charts.
Database Import
Convert JSONL exports to CSV for bulk import into SQL databases like PostgreSQL or MySQL.
Report Generation
Transform JSONL log data into CSV tables for business reports and dashboards.
Data Sharing
Convert JSONL datasets to CSV for sharing with non-technical stakeholders who prefer spreadsheets.
Frequently Asked Questions
How are nested JSON objects handled?
Nested objects are flattened with dot notation. For example, {"user":{"name":"Alice"}} becomes a column "user.name" with value "Alice". Arrays are kept as JSON strings.
What if JSONL lines have different keys?
All unique keys across all lines are collected as CSV columns. If a line is missing a key, the corresponding cell is left empty.
Is my data safe?
Yes. All conversion happens locally in your browser. No data is sent to any server. Your JSONL content never leaves your device.
Can I convert CSV back to JSONL?
Not yet with our tool, but you can convert CSV to JSON using most spreadsheet applications, then use our JSON to JSONL converter.