ApplicationText-based

`application/x-ndjson`

Newline-Delimited JSON

Reference for application/x-ndjson, the MIME type for newline-delimited JSON used in streaming and log processing.

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Expected extensions: .ndjson, .jsonl

HTTP Content-Type Header

HTTP Header

Content-Type: application/x-ndjson; charset=utf-8

Associated File Extensions

.ndjson.jsonl

Quick Facts

MIME Type	application/x-ndjson
Category	Application
Type	Text-based (human-readable)
Extensions	.ndjson, .jsonl

Common Usage

NDJSON (also called JSON Lines) stores one JSON object per line, making it ideal for streaming large datasets, log files, and data processing pipelines. Used by Elasticsearch bulk API, BigQuery imports, structured logging systems, and machine learning data pipelines.

Code Examples

HTML

<!-- Link or embed with explicit type -->
<link rel="stylesheet" href="file.ndjson" type="application/x-ndjson">

<!-- Or for script/media elements -->
<script type="application/x-ndjson" src="file.ndjson"></script>

Node.js

// Express.js
app.get('/file', (req, res) => {
  res.type('application/x-ndjson');
  res.send(data);
});

// Node.js http
res.writeHead(200, { 'Content-Type': 'application/x-ndjson' });

nginx

# nginx.conf — add to types block or use default
types {
    application/x-ndjson  ndjson jsonl;
}

# Or set for a specific location
location /api/ {
    default_type application/x-ndjson;
}