Can a JSON Lines file contain empty lines?

Standard NDJSON parsers skip empty lines, though strict specifications recommend avoiding trailing blank lines in production pipelines.

JSON Lines Tool

Format and validate JSON Lines (NDJSON) line by line, or convert between JSON arrays and newline-delimited JSON.

Parsing and conversions execute entirely within your browser runtime. Server logs remain private.

Input

All lines are valid JSON.

Result

{
  "name": "Alice",
  "age": 30
}
{
  "name": "Bob",
  "age": 25
}

What is JSON Lines Tool?

JSON Lines Tool is a dedicated utility for working with Newline Delimited JSON (NDJSON / JSONL). Widely used in big data processing, Elasticsearch pipelines, and streaming server logs, each line in JSONL is a standalone valid JSON value. This tool validates line-by-line syntax, pretty-prints records, and converts seamlessly between JSON arrays and JSONL format.

How to use JSON Lines Tool

1Select your desired mode: Format & validate, JSONL → Array, or Array → JSONL.
2Paste your JSON Lines or JSON array data into the input box.
3View the validated or converted output in the result panel and copy with one click.

Key features

Line-by-Line Error Detection

Validates every line individually and flags exact line numbers containing invalid JSON.

Bidirectional Conversion

Converts Newline Delimited JSON into standard JSON arrays, or flattens JSON arrays into JSONL.

Pretty-Print Formatting

Formats each JSONL record for clean visual inspection during log analysis.

100% Client-Side Log Privacy

Parses streaming logs and analytics data locally in memory without transmitting anything over the wire.

Examples & use cases

JSONL to Array Conversion

Converting two JSON Lines into a single JSON array

Input:

{"user":"Aarav","event":"login"}
{"user":"Diya","event":"logout"}

Result:

[
  {
    "user": "Aarav",
    "event": "login"
  },
  {
    "user": "Diya",
    "event": "logout"
  }
]

Frequently asked questions

Standard JSON represents a single root data structure (object or array). JSON Lines stores multiple JSON records separated by newline characters (\n), allowing tools to stream and process files line by line without reading the entire document into memory.