What is JSON / NDJSON Converter?
JSON and NDJSON Converter is designed for logs, bulk imports, and event streams. A root array becomes one compact JSON value per line, while NDJSON is parsed line by line into an array with an exact failing line number when a record is malformed. Common workflows include the following. Create JSON Lines for event logs or bulk imports. Combine line-oriented API output into a reviewable JSON array. Locate the exact damaged record in an NDJSON batch. The page also documents input boundaries, output behavior, and practical cautions so you can review the result before putting it into an application, configuration, test, or production workflow.
When to use it
- Create JSON Lines for event logs or bulk imports.
- Combine line-oriented API output into a reviewable JSON array.
- Locate the exact damaged record in an NDJSON batch.
How to use it
- Prepare a root array for JSON conversion.
- Ensure every non-blank NDJSON line contains one JSON value.
- Run and repair any reported line.
- Compare line and array-item counts before copying.
- Load one of the realistic examples first to verify the selected options and processing direction before replacing it with your own data.
- Review the output, status message, and documented limits; copy, download, or continue only after the result matches your expectation.
Runnable examples
The “Example 1” and “Example 2” buttons load the matching inputs. They cover different structures, directions, or boundaries and can be run directly in the workspace.
Example 1
[{"id":1,"event":"deploy","status":"ready"},{"id":2,"event":"verify","checks":["unit","e2e"]}]Example 2
{"id":101,"event":"tool release","ok":true}
{"id":102,"event":"production verification","ok":true}Input rules
- JSON to NDJSON requires a root array.
- Every non-blank NDJSON line must contain one complete JSON value.
- A single JSON value cannot span several lines.
- Text input is counted before processing and is limited to 1,000,000 characters on this page; file modes apply the separate file limit shown in the workspace.
- JSON to NDJSON requires a root array.
Output rules
- Array items keep their order and occupy one line each.
- Blank lines are ignored during import.
- Imported output is a formatted JSON array.
- Output reflects only the current input, direction, and options; rerun after changing a mode or value instead of treating an earlier result as current.
- Blank lines are ignored and every other line must be complete JSON.
Limitations and cautions
- JSON to NDJSON requires a root array.
- Blank lines are ignored and every other line must be complete JSON.
- One JSON document cannot span several lines.
How your data is handled
All parsing, conversion, binary encoding, and intermediate data remain in the current browser tab. JSONLane does not upload the input or retain it after refresh or close.