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How to Convert NDJSON to JSON

Transform Newline Delimited JSON (NDJSON/JSON Lines) into standard JSON arrays

Step 1

Input Your NDJSON Data

Paste your NDJSON data into the input editor. Each line should be a complete, valid JSON value. You can also upload .ndjson, .jsonl, or .txt files directly.

•
Paste directly: Copy NDJSON output from your logs, APIs, or data pipelines
•
Upload a file: Click "Upload" to select a .ndjson, .jsonl, or .txt file
•
Try the sample: Click "Sample" to load example NDJSON data

Example: NDJSON Input (Analytics Events)

One JSON object per line — tracking user activity events:

{"event":"page_view","user_id":"u_123","page":"/products","duration_sec":12}
{"event":"add_to_cart","user_id":"u_123","page":"/products/widget","item_id":"p_456"}
{"event":"checkout","user_id":"u_123","page":"/checkout","total":49.99}
{"event":"page_view","user_id":"u_789","page":"/blog","duration_sec":45}
Step 2

Automatic Conversion to JSON Array

The converter automatically parses each NDJSON line and combines them into a standard JSON array:

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Line-by-line parsing: Each NDJSON line is independently validated and parsed
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Array wrapping: Valid JSON objects are combined into a properly formatted JSON array
•
Error reporting: Invalid lines are flagged so you can fix them

Example: JSON Array Output

The NDJSON lines wrapped in a standard JSON array:

[
  {
    "event": "page_view",
    "user_id": "u_123",
    "page": "/products",
    "duration_sec": 12
  },
  {
    "event": "add_to_cart",
    "user_id": "u_123",
    "page": "/products/widget",
    "item_id": "p_456"
  },
  ...
]
Step 3

Export Your JSON

Get the converted JSON array ready for your projects:

•
Copy to clipboard: One-click copying of the formatted JSON array
•
Download as file: Save as a .json file for APIs, databases, or further processing
•
Use anywhere: The standard JSON array works with any tool that accepts JSON

What is NDJSON to JSON Conversion?

NDJSON to JSON conversion combines individual NDJSON lines into a standard JSON array. While NDJSON stores one record per line for efficient streaming and processing, many applications and APIs expect data in standard JSON array format as defined in RFC 8259.

This conversion is commonly needed when working with data exports from the Elasticsearch Bulk API, Google BigQuery, MongoDB, and structured logging systems. These tools output data in NDJSON format, but downstream applications often require a standard JSON array.

The converter reads each line, validates it using JSON.parse(), and wraps all valid objects into a properly formatted JSON array. Invalid lines are skipped with error reporting, ensuring reliable conversion even with imperfect data.

When to Convert NDJSON to JSON

Understanding when to convert between these formats helps you work efficiently with different tools and systems:

API Integration

Most REST APIs expect JSON arrays for batch data. Convert NDJSON exports to JSON before sending to APIs that don't support streaming formats.

JSON ValidatorJSON Formatter

Best for: REST APIs, webhook payloads, frontend rendering

Data Visualization

Charting libraries and frontend frameworks typically consume JSON arrays. Convert NDJSON log data or analytics exports to JSON for visualization.

JSON ViewerNDJSON to Table

Best for: Dashboards, charts, data tables, frontend apps

Frequently Asked Questions

Why convert NDJSON to JSON?

Many tools and APIs expect standard JSON arrays rather than NDJSON format. Converting NDJSON to JSON makes your data compatible with JSON viewers, validators, databases, and frontend applications that don't support NDJSON natively.

What happens to invalid NDJSON lines?

Invalid lines are skipped during conversion, and the error count is displayed in the output header. Only valid JSON lines are included in the final JSON array. Use our NDJSON Validator to identify and fix problematic lines.

Can I convert JSON back to NDJSON?

Yes! Use our JSON to NDJSON converter to transform a JSON array back into NDJSON format with one object per line.

What services output NDJSON data?

NDJSON is commonly output by the Elasticsearch Bulk API, Google BigQuery exports, MongoDB's mongoexport tool, Apache Kafka streams, AWS Kinesis, and structured logging libraries like Pino and Bunyan.

Can I also convert NDJSON to CSV or a table?

Yes! You can convert NDJSON to CSV format for spreadsheets and databases, or view it as a sortable table for quick data inspection.

Does this handle empty lines in NDJSON?

Yes, empty lines are automatically skipped during parsing as per the NDJSON specification. Only non-empty lines are processed and included in the output JSON array.

Is this converter free to use?

Yes, completely free with no file size limits, usage restrictions, or registration required. All processing happens in your browser — your data never leaves your device.

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