.jsonl vs .json Format?

What is .jsonl Format?

A .jsonl (JSON Lines) file is a format where each line is a separate JSON object. Unlike regular JSON (.json), which is a structured collection of key-value pairs enclosed in an array, .jsonl is a newline-delimited format that makes it easier to process large datasets efficiently.

Why Use .jsonl?

1. Streaming & Incremental Processing – Since each line is a standalone JSON object, you can read or write data line by line without loading the entire file into memory.
2. Better for Large Data – Ideal for handling massive datasets since it supports append-based operations.
3. Easier to Parse – Each line can be read as a separate record, reducing complexity compared to nested JSON structures.
4. Compatibility with Machine Learning Pipelines – Many AI/ML frameworks, including Hugging Face's datasets library, use .jsonl for dataset storage.

How is .jsonl Similar to JSON?

• Both use key-value pairs in JSON format.
• Both support nested structures within individual records.
• .jsonl is essentially a list of independent JSON objects, while .json typically represents structured collections like arrays or dictionaries.

Example of .jsonl Format

Each line represents a separate JSON object:

{"id": 1, "name": "Alice", "age": 25, "city": "New York"}
{"id": 2, "name": "Bob", "age": 30, "city": "San Francisco"}
{"id": 3, "name": "Charlie", "age": 28, "city": "Chicago"}
        

Example of .json Format (Traditional JSON)

[
  {"id": 1, "name": "Alice", "age": 25, "city": "New York"},
  {"id": 2, "name": "Bob", "age": 30, "city": "San Francisco"},
  {"id": 3, "name": "Charlie", "age": 28, "city": "Chicago"}
]
        

Key Difference

• .jsonl is line-by-line, making it easy to stream and process records individually.
• .json requires parsing the entire file before accessing specific records

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