NDJSON to JSON Array Converter

About this calculator

NDJSON (Newline Delimited JSON, also called JSON Lines or .jsonl) stores one complete, self-contained JSON object per line instead of wrapping everything in a single top-level array. This format is popular for streaming and append-only data because a producer can write one record at a time without ever needing to rewrite the whole file, and a consumer can process it line by line without loading the entire dataset into memory.

Tools like Elasticsearch's bulk API, Fluentd and other log shippers, Spark and BigQuery data loaders, and many machine-learning dataset formats all emit or expect NDJSON. This converter parses each line as an independent JSON value and combines them into a single pretty-printed JSON array, which is the format most general-purpose JSON viewers, `jq` pipelines, and REST APIs expect when NDJSON isn't directly supported.