How to use this tool
- Paste NDJSON with exactly one complete JSON value on each nonblank line.
- Choose indentation and run Convert NDJSON to JSON array.
- Review the result and diagnostics before copying or downloading.
Private by default
NDJSON to JSON Array Converter
Turn JSON Lines records into a formatted array with line-specific invalid-input diagnostics.
Your data stays in this browser
UTF-8Ln 1, Col 1
UTF-8—
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Your data stays in this browserInstantNo server round trips
PrivateBrowser-side processing
AuditableDocumented semantics
PortableCorrectly typed downloads
Category
NDJSON to JSON: How to use this tool
Parse each nonblank NDJSON line as strict JSON and collect the values into one JSON array.
Turn JSON Lines records into a formatted array with line-specific invalid-input diagnostics.
Open guide and examples
Example to try
Input NDJSON
{"id":1,"event":"created"}
{"id":2,"event":"updated","active":true}Result
[
{
"id": 1,
"event": "created"
},
{
"id": 2,
"event": "updated",
"active": true
}
]Learn
Frequently asked questions
Is my data sent to a server?
No. The engine runs in your browser and applies local resource limits.
What happens with invalid input?
The tool reports a diagnostic and does not keep stale output.
What does NDJSON to JSON produce?
It emits a JSON array in the same record order and ignores blank lines.
What limitation applies to NDJSON to JSON?
A record cannot span physical lines; this bounded workspace does not claim streaming conversion.