Step 1 / source
Choose the source
Drop one file here
Choose the flat json properties object you want to turn into java-style properties file.
Checking publication status...LOCAL CONFIG CONVERTER / JSON TO PROPERTIES
JSON to Properties
Write one flat JSON object as escaped Java-style key-value properties with optional Unicode escape output.
Processed in this browserOne UTF-8 .json file up to 2 MB. The root must be a non-empty flat object of scalar values; output is limited to 20 MB.
JSON - flat properties object
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 2 MB. The root must be a non-empty flat object of scalar values; output is limited to 20 MB.
Plain-language method
How JSON to Properties works
Nirmion validates one flat object, converts scalar values to text, escapes separators, comment markers, backslashes, whitespace controls, and significant leading spaces, and optionally converts non-ASCII UTF-16 code units to \uXXXX sequences.
- 01Choose a valid source
Every value must be a string, number, boolean, or null. Null becomes an empty property value.
- 02Review the conversion choices
UTF-8 is readable in modern workflows. Escaped mode is useful for consumers expecting traditional ASCII-oriented properties.
- 03Inspect the separate result
The result ends in _nirmion_tools.properties. It uses one deterministic key=value assignment per line.
Useful when
Practical jobs this tool handles
- Prepare application resource settings from JSON.
- Generate deterministic test properties.
- Move reviewed flat configuration into a Java-oriented format.
Before converting
Check the source and destination rules
- Keep the JSON object flat.
- Choose the destination encoding contract.
- Review nulls and leading spaces.
Know the boundary
Know what the destination format cannot keep
Generic properties files do not preserve JSON types, null, nested data, arrays, comments, or duplicate keys. Test the output in the target application.
Quick answers
Questions before you convert
The conversion contract is deliberately explicit.
Are nested objects flattened?
No. Explicit rejection avoids dotted-key collisions.
What does escaped Unicode do?
It writes non-ASCII UTF-16 units as \uXXXX sequences.
How is null written?
As an empty value after the equals sign.