JSONL to JSON Converter
Convert JSONL (JSON Lines) to a JSON array instantly. 100% client-side, your data never leaves your browser.
Input JSONL
Drop a .jsonl file here, or click to browse
Supports .jsonl, .ndjson, .json, .txt
Output JSON
Paste or drop JSONL content to convert
How to Convert JSONL to JSON
JSONL (JSON Lines) stores one JSON object per line. To convert it to standard JSON, each line is parsed individually and the results are combined into a single JSON array.
Our converter reads your JSONL file entirely in the browser. No data is uploaded to any server. Simply paste your JSONL text or drag and drop a file, and the converted JSON array appears instantly.
The output JSON array preserves the original order of lines. Invalid lines are skipped and reported separately so you can fix them.
What is JSONL to JSON Conversion?
JSONL to JSON conversion transforms a newline-delimited format (one JSON object per line) into a standard JSON array. This is useful when you need to use JSONL data with tools that only accept standard JSON, such as APIs, visualization tools, or database import utilities.
For example, a JSONL file with three objects becomes a JSON array containing those three objects, properly formatted with indentation for readability.
Common Use Cases
API Integration
Convert JSONL log files or data exports to JSON arrays for REST API consumption.
Data Analysis
Transform JSONL datasets into JSON for use with visualization libraries and analysis tools.
Database Import
Convert JSONL exports to JSON arrays for importing into MongoDB, PostgreSQL, or other databases.
ML Dataset Preparation
Convert machine learning datasets between JSONL and JSON formats for different training frameworks.
Frequently Asked Questions
Is my data safe when converting?
Yes. All conversion happens locally in your browser. No data is sent to any server. Your JSONL content never leaves your device.
What happens to invalid JSONL lines?
Invalid lines are skipped during conversion and listed separately with their error details. Valid lines are still converted normally.
Is there a file size limit?
There is no hard limit. The converter uses streaming to handle large files efficiently. Files up to several hundred megabytes can be converted smoothly.
Can I convert JSON back to JSONL?
Yes! Use our JSON to JSONL converter to transform JSON arrays back into JSONL format.