Withdata DataFileConverter converts JSON files to YAML locally — single file, batch, or merge multiple JSON files into one YAML. Object arrays, plain arrays and JSON Lines are all supported. 100% local, secure, and cross-platform.

JSON is a widely used structured data format.

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Why Choose Withdata JSON to YAML Converter?

🔒 100% Local & Secure

JSON files are read and converted on your own computer. Nothing is uploaded to any cloud server.

⚡ Fast Streaming Conversion

Large JSON files are processed in streaming mode with low memory usage — millions of rows within a minute.

📁 Batch & Merge

Batch convert many JSON files to YAML files, or merge multiple JSON files into one YAML.

🔄 Nested YAML → Dotted Columns

Nested mappings become address.city-style column names; sequences and block scalars are expanded automatically.

🖥 Windows, macOS, Linux

Native builds for Windows, macOS and Linux, with a step-by-step GUI wizard and a command line interface.

⏱ CLI & Scheduled Tasks

Save a conversion session and run it automatically from Windows Task Scheduler or crontab.

Full Feature Comparison

Feature	Supported details
Input source	Local JSON, batch JSON, merged JSON, URL / cloud JSON
Output format	YAML with configurable indent (default 2) and flow style
Conversion mode	Single file · merge many JSON files into one YAML · batch (one to one)
Running mode	GUI wizard · command line · scheduled tasks
Source options	Object array / JSON Lines mode, nested flattening, encoding
Output options	Column mapping, encoding, date format, empty value handling
Platform	Windows, macOS, Linux (native, 64-bit)

All JSON to YAML Conversions You Need

Single JSON file → YAML file, step by step in the GUI wizard
Batch convert multiple JSON files → multiple YAML files
Merge multiple JSON files into one YAML — merge tool
Convert JSON to YAML in the command line, and run it as a scheduled task
All JSON conversion tools and all YAML conversion tools

JSON to YAML Notes

A JSON object array, a plain array or JSON Lines (one object per line) can be read.
Nested objects and arrays are flattened into columns.
Deep nesting levels and UTF-8 files with BOM are handled.
The output indent can be set (2 spaces by default).
Flow style ({ } / [ ]) can be enabled or disabled.
Dotted column names can be written back as nested YAML mappings.

How to Convert JSON to YAML (4 Steps)

Open Withdata DataFileConverter and select JSON as the input type and YAML as the output type.
Load your JSON data — a single file, a folder / list of files for batch conversion, or several files to merge into one.
Check the preview table, then adjust the source options and the output options.
Click Convert — the YAML output is written in seconds. Save the session if you want to run it again from the command line.