JSON (JavaScript Object Notation) is an open standard file format and data interchange format that uses human-readable text to store and transmit data objects consisting of name-value pairs and arrays (or other serializable values).
Here are some JSON conversion tools, Convert data between JSON and other file types, between JSON and databases, Merge JSON files, Split JSON files.
Some conversion tools for JSON lines (JSONL), Newline Delimited JSON (NDJSON), Line-delimited JSON (LDJSON).