Step 1 / source
Choose the source
Drop one file here
Choose the json object or array you want to turn into readable yaml document.
Checking publication status...LOCAL DATA CONVERTER / JSON TO YAML
JSON to YAML
Convert one bounded JSON object or array into readable YAML while preserving nested values, ordering, and scalar types.
Processed in this browserOne UTF-8 .json file up to 5 MB and 20 MB output. The root must be an object or array; nesting is limited to 100 levels and 1,000,000 visited values.
JSON - object or array
No file upload
This operation runs with browser APIs. Nirmion receives catalogue requests, not the selected source bytes.
Original stays unchanged
The converter creates a separately named output. It never writes back into the source file.
Bounded work
One UTF-8 .json file up to 5 MB and 20 MB output. The root must be an object or array; nesting is limited to 100 levels and 1,000,000 visited values.
Plain-language method
How JSON to YAML works
Nirmion parses exactly one JSON value, requires an object or array root, checks depth and node limits, and serializes the same strings, numbers, booleans, nulls, arrays, and objects as one YAML document. It never evaluates values as code.
- 01Choose a valid source
Use valid JSON with quoted property names and no comments. A lone string, number, boolean, or null is rejected because it rarely represents a useful configuration document.
- 02Review the conversion choices
Two spaces is common in YAML. Four spaces improves visual nesting but increases output size.
- 03Inspect the separate result
The download ends in _nirmion_tools.yaml. Property order follows parsed JSON insertion order, although downstream YAML software may reorder mappings.
Useful when
Practical jobs this tool handles
- Prepare reviewed JSON configuration for a YAML-based service.
- Make nested fixture data easier to read.
- Create a YAML handoff without installing a converter.
Before converting
Check the source and destination rules
- Validate the JSON first.
- Confirm the receiving tool supports ordinary YAML mappings and sequences.
- Review strings that resemble dates or numbers after import.
Know the boundary
Know what the destination format cannot keep
Comments do not exist in JSON and therefore cannot appear in the YAML. YAML anchors, aliases, tags, and custom types are not invented.
Quick answers
Questions before you convert
The conversion contract is deliberately explicit.
Are JSON data types preserved?
Strings, numbers, booleans, nulls, arrays, and objects keep their data meaning.
Will it add YAML anchors?
No. The output is straightforward expanded YAML.
Does it support JSON comments?
No. Comments are not part of valid JSON.