JSON → NDJSON Converter
Convert JSON to NDJSON Online
Transform JSON arrays into NDJSON (newline-delimited JSON) format for streaming, logging, and data pipelines. Convert Buddy's streaming engine processes files of any size entirely in your browser with no uploads or limits.
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Streams JSON arrays to NDJSON
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Ideal for log processing
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Memory-efficient streaming
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Validates output per line
Start Converting JSON to NDJSON
No registration required. Files processed locally in your browser.
Command Center
Detect → schema → convert
Drop a file and watch Convert Buddy detect structure, preview fields, and convert instantly.
Drop a file to detect + convert
Supported formats: CSV, JSON, NDJSON, XML
Detection status
IdleFormat: json
Structure: Awaiting detection.
Fields: 0
Estimated records: —
Input: Awaiting file
Output format
Choose your destination format.
Performance telemetry
LiveThroughput
0.0 MB/s
Records/sec
0
Records processed
0
Elapsed
00:00
Bytes in/out
0.0 MB / 0.0 MB
Output
Output will appear here after conversion completes.
Format: json → ndjson
Output files are UTF-8 text. JSON output is intentionally minified for streaming performance, so it may open as a single line until you run your editor's format command.
Frequently Asked Questions
Why convert JSON to NDJSON?
NDJSON is optimized for streaming and append-only scenarios like log files, data pipelines, and incremental processing. Each line is a complete JSON object, making it easy to process line-by-line without parsing the entire file. It is widely used in data engineering and analytics.
How does JSON to NDJSON conversion work?
Convert Buddy parses your JSON file and writes each element (from arrays) or record as a separate line. Each line is a complete, valid JSON object. This allows downstream systems to process the file incrementally without loading everything into memory.
Can I convert large JSON files to NDJSON?
Yes. Convert Buddy uses a streaming parser that processes JSON arrays incrementally. Even if your JSON file is several GB, the conversion happens in chunks with real-time progress tracking. The output is streamed directly to your download.
Is NDJSON human-readable?
Yes. NDJSON is plain text where each line is a readable JSON object. You can open NDJSON files in any text editor. However, because there is one object per line (no array wrapper), it is more compact and easier to process programmatically than standard JSON arrays.
What tools consume NDJSON?
NDJSON is supported by many data tools including BigQuery, Elasticsearch, Apache Kafka, jq, and command-line tools like grep and awk. It is also the preferred format for streaming APIs and log aggregation systems.
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