Is my JSON data uploaded to a server?

No. Everything runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.

What input is expected?

A JSON array. Each element is serialized compactly on its own line — the NDJSON / JSON Lines format used by streaming pipelines, BigQuery, jq and log tooling.

100% local — your data never leaves your browser

JSON to NDJSON Converter — Free Online Tool

Convert a JSON array to newline-delimited JSON (JSON Lines) instantly in your browser. Free and private: your data never leaves your device.

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Swap: NDJSON → JSON

JSON input

NDJSON output

Why convert JSON to NDJSON?

Streaming pipelines, log processors and bulk-import APIs (BigQuery, Elasticsearch) consume newline-delimited JSON rather than a single big array. Paste a JSON array above to get one compact record per line.

How it works

The converter parses your JSON locally, checks the root is an array, and emits each element with JSON.stringify on its own line. Nested structure is preserved — only the top-level array brackets and commas disappear.

Frequently asked questions

Is my JSON data uploaded to a server?: No. Everything runs entirely in your browser with JavaScript. Nothing is sent over the network, which makes the tool safe for sensitive data.
What input is expected?: A JSON array. Each element is serialized compactly on its own line — the NDJSON / JSON Lines format used by streaming pipelines, BigQuery, jq and log tooling.