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JSON to JSONLines Converter

Transform JSON to JSONLines/NDJSON format

JSON Input

JSONLines Output

About JSON to JSONLines Converter

Convert JSON arrays to JSONLines (also known as JSONL or NDJSON - Newline Delimited JSON) format. Each JSON object becomes a single line, perfect for streaming and big data processing.

Key Features

  • Array Processing: Converts JSON arrays to one object per line
  • Compact Mode: Optional minified output for smaller file sizes
  • Sort Keys: Alphabetically sort object keys for consistency
  • Statistics: View line count and size metrics
  • File Upload: Upload JSON files directly or paste data
  • Instant Preview: Real-time conversion as you type

How to Use

  1. Input JSON Data: Paste your JSON array or upload a .json file
  2. Configure Options: Choose compact mode and sorting preferences
  3. Review Output: The JSONLines output updates automatically
  4. Copy or Download: Save as .jsonl file for use in data pipelines

Example Conversion

JSON Input:

[
  {"id": 1, "name": "John", "age": 28},
  {"id": 2, "name": "Jane", "age": 34}
]

JSONLines Output (Compact):

{"id":1,"name":"John","age":28}
{"id":2,"name":"Jane","age":34}

Common Use Cases

  • Big Data: Process large datasets line-by-line in Hadoop, Spark, or similar tools
  • Streaming: Stream JSON data without loading entire arrays into memory
  • Log Files: Convert JSON logs to JSONL format for easier parsing
  • Database Import: Import data into databases that support JSONL
  • API Responses: Transform API responses for batch processing

What is JSONLines?

JSONLines (JSONL/NDJSON) is a text format where:

  • Each line is a valid JSON value (usually an object)
  • Lines are separated by newline characters (\n)
  • Files can be processed line-by-line without loading everything into memory
  • Perfect for streaming and big data applications

Format Specifications

  • Line Separator: Unix-style newline (\n)
  • Encoding: UTF-8
  • File Extension: .jsonl or .ndjson
  • MIME Type: application/x-ndjson

Privacy & Security

All conversions happen locally in your browser. Your JSON data is never uploaded to any server, ensuring complete privacy and security.