NDJSON Viewer
View NDJSON — newline-delimited JSON — with each record parsed and readable.
One JSON object per line
NDJSON stores many JSON objects with one per line, rather than as a single big array. It is the format of choice for logs, data streams and large exports, because a program can read and process it one record at a time without loading the whole thing into memory. This parses NDJSON and lays out each record readably, so you can inspect a file that is otherwise a dense stack of lines.
Paste or open NDJSON and each record is displayed.
Why NDJSON instead of an array
The line-per-object design is deliberate and practical. A single giant JSON array has to be fully parsed before you can touch any of it, which is hopeless for a log file that never ends or a dataset too big for memory; NDJSON lets you stream through it record by record and stop whenever you like. That is why it dominates logging and data pipelines. Viewing it here parses each line so you can read the records, check the structure is consistent, and spot a malformed line, which in NDJSON breaks only its own record rather than the whole file.
Frequently asked questions
What is NDJSON?
Newline-delimited JSON — one JSON object per line — used for logs, streams and large exports that are read record by record.
Why not use a single JSON array?
An array must be fully parsed before use; NDJSON can be streamed one record at a time, which suits logs and huge datasets.
Is my data uploaded?
No. It is parsed in your browser.