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JSON ↔ Properties

Spring and many Java services still use app.name=... properties. JSON is easier for frontend and scripts.

Common dotted keys such as app.server.port become nested objects, and can be flattened again.

Multiline values, rare escapes, and duplicate keys follow common implementations. After a production migrate, compare startup logs.

Datasource passwords in the config never leave the browser.

Flatten it yourself if you want a flat map. Nested JSON usually becomes a.b.c= on the way back to properties.

New Spring projects often use application.yml. Use this page to maintain old .properties files or to compare the two formats.

Paste key=value text or JSON.
Choose Props → JSON or JSON → Props.
Check ports, flags, and password fields for drops.
Copy into the config repo. To compare two environments, convert both to JSON and Diff.
Spot-check duplicate keys and list indexes such as servers.0.host.

Do dots become nesting?

Common dotted keys become objects. Flatten the structure after convert if you don't want nesting.

Are comments kept?

Comments are not kept after the trip to JSON.

When should I use YAML instead?

New projects usually use YAML / TOML. Use this page for old Java config.

Is the config uploaded?

No.

Are multiline values supported?

Common continuations are partly handled. Check unusual multiline values against the original.

Do booleans and numbers change type?

Properties are all strings. Some implementations guess types on the way to JSON — check flag fields.

How is this different from GET params?

Both look like key=value, but properties is a config file, not URL encoding.

How are lists represented?

Common patterns are comma-separated values or .0 / .1 indexes. Adjust to your project's binding after generate.