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How to Convert NDJSON to YAML

Transform Newline Delimited JSON into human-readable YAML format for configuration files and documentation

Step 1

Input Your NDJSON Data

Paste your NDJSON data where each line is a valid JSON value. The converter transforms each line into a YAML list entry, making streaming data instantly usable in configuration systems.

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Paste directly: Copy NDJSON from log files, streaming APIs, or data exports
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Upload a file: Click "Upload" to select a .ndjson, .jsonl, or .txt file
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Try the sample: Click "Sample" to see a working conversion example

Example: NDJSON Input (Microservice Config)

Each line is a JSON object representing a service configuration record:

{"name":"api-service","port":8080,"replicas":3,"env":"production","enabled":true}
{"name":"worker-service","port":8081,"replicas":2,"env":"production","enabled":true}
{"name":"scheduler","port":8082,"replicas":1,"env":"production","enabled":false}
Step 2

Automatic YAML Conversion

The converter processes each JSON Lines entry and produces clean, standards-compliant YAML 1.2:

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YAML list format: Multiple NDJSON lines become a YAML sequence with dash (-) prefixes
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Nested support: Objects and arrays are properly indented as YAML mappings and sequences
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Type preservation: Numbers, booleans, strings, and null are correctly represented in YAML
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Special character handling: Strings with colons, quotes, or brackets are automatically quoted

Example: YAML Output

Each NDJSON line becomes a YAML list item with proper indentation — ready for Kubernetes or Ansible:

- name: api-service
  port: 8080
  replicas: 3
  env: production
  enabled: true
- name: worker-service
  port: 8081
  replicas: 2
  env: production
  enabled: true
- name: scheduler
  port: 8082
  replicas: 1
  env: production
  enabled: false
Step 3

Export Your YAML

Get the YAML output ready for your configuration files, documentation, or orchestration tools:

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Copy to clipboard: Paste directly into config files, documentation, or YAML editors
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Download as .yaml: Save as a YAML file for Kubernetes, Docker Compose, Ansible, and CI/CD pipelines
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Human-readable output: YAML is far easier to read and edit than JSON for configuration and documentation purposes

What is NDJSON to YAML Conversion?

NDJSON to YAML conversion transforms Newline Delimited JSON records into YAML (YAML Ain't Markup Language) — a human-friendly data serialization format widely used for configuration files. Each JSON Lines record becomes a YAML list item.

This conversion is especially useful when working with data from streaming systems that output JSON (RFC 8259) and you need to feed that data into configuration-driven tools. Kubernetes, Ansible, and Docker Compose all rely heavily on YAML, making this conversion a key step in many DevOps workflows.

The converter reads each NDJSON line, parses the JSON value, and outputs a properly structured YAML document. Nested objects become YAML mappings, arrays become YAML sequences, and all primitive types (strings, numbers, booleans, null) are represented according to YAML 1.2 specification.

Frequently Asked Questions

How are multiple NDJSON lines represented in YAML?

Each NDJSON line becomes an item in a YAML sequence (list). If you have 5 NDJSON lines with JSON objects, the output will be a YAML list of 5 mappings, each prefixed with a dash (-). This matches the structure expected by tools like Kubernetes.

Does this handle nested JSON objects?

Yes. Nested objects and arrays in NDJSON are converted to properly indented YAML structures. Objects become YAML mappings and arrays become YAML sequences with correct indentation at every level.

What happens to special characters in strings?

Strings containing special YAML characters (colons, brackets, quotes, hash marks, etc.) are automatically quoted with double quotes to prevent parsing issues. Plain strings without special characters remain unquoted for maximum readability.

Can I convert the YAML back to NDJSON?

For the reverse direction, use our NDJSON Viewer or NDJSON to JSON converter. You can also convert your data to CSV format for spreadsheet analysis.

What NDJSON sources commonly need YAML conversion?

Data exports from the Elasticsearch Bulk API, Google BigQuery JSON exports, MongoDB mongoexport output, and structured logging libraries (Pino, Bunyan, Winston) frequently need YAML conversion for infrastructure tooling.

Is YAML better than JSON for configuration files?

YAML is generally preferred for human-edited configuration files because it is more readable — no curly braces, less punctuation, and support for comments. JSON is better for machine-to-machine data exchange. Tools like Kubernetes and Ansible use YAML natively for this reason.

Is this converter free?

Yes, completely free with no limits. All processing happens in your browser — your data never leaves your device.

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