FileConvert

Data converter

NDJSON to JSON Converter

Turn NDJSON files into JSON without installing anything. The target format on this page is already set to JSON, so a single file or a whole folder is one press of Convert away.

  • Whole batches at once
  • Quality you control
  • Removed once it is done

NDJSON JSON

or drop files here

Files travel over TLS and are deleted from the server as soon as the conversion finishes.

NDJSON and JSON: what actually changes

NDJSON is one JSON object per line, so a huge file can be streamed rather than parsed whole. JSON is nested key/value data, the lingua franca of web APIs.

Records are read out of the NDJSON with their structure intact and written as JSON, so this is a real parse rather than a text substitution — quoting, escaping and character encoding are all handled for you. The JSON you get back keeps nesting, arrays, numbers, booleans and nulls, and gives up comments and column ordering guarantees. The thing to check before you rely on the output is typing: dates, leading zeros and very large integers are where formats disagree.

How it goes3 steps

  1. Add your NDJSON files
    Drop them onto the box above or click Select File. Add as many .ndjson files as you like — the whole batch converts in one go, and duplicates are ignored.
  2. Confirm JSON as the output
    JSON is already selected as the target format on this page. Check the delimiter and encoding options if your data is unusual.
  3. Download your JSON
    Hit Convert and grab the finished JSON files individually or as a single ZIP. Everything is deleted from the server once you have them.

Format facts

What each side of this conversion is good at, so you know what you are trading away.

Source .ndjson

NDJSON

One JSON object per line, so a huge file can be streamed rather than parsed whole.

Compression
Lossless
Transparency
Not supported
Keeps
Record structure while staying line-addressable
Gives up
The enclosing array — each line stands alone

Result .json

JSON

Nested key/value data, the lingua franca of web APIs.

Compression
Lossless
Transparency
Not supported
Keeps
Nesting, arrays, numbers, booleans and nulls
Gives up
Comments and column ordering guarantees

Send NDJSON somewhere else

Every other format a NDJSON file can leave as.

From .ndjson 5 targets

csv tsv parquet yaml xml

Related converters

Other routes in and out of these formats.

XLSX JSON XLSX to JSON XLS JSON XLS to JSON ODS JSON ODS to JSON CSV JSON CSV to JSON TSV JSON TSV to JSON PARQUET JSON Parquet to JSON YAML JSON YAML to JSON XML JSON XML to JSON TOML JSON TOML to JSON

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