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JSON (JavaScript Object Notation) is a format to represent and exchange data in a human readable form. See for a formal definition. JSON is easier explained here:

JSON parser

devonfw recommends FasterXMLs Jackson as JSON parser. There’s a useful series on Jackson on Baeldung:

  • Spring

  • Quarkus

Spring offers a default support for mapping with Jackson, when spring-starter-web is used.

Quarkus offers the following extension:

This extension adds the usual quarkus-resteasy-reactive functionality and adds the mapping using Jackson.

Use ISO8601 in UTC for timestamp representation

It’s recommended to use ISO 8601 as timestamp representation yyyy-MM-dd’T’HH:mm:ssXXX. Furthermore, always send timezones in UTC.

This can be achieved on a ZonedDateTime field with the following annotation:

@JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ssXXX", timezone = "UTC", lenient = OptBoolean.TRUE)

Send monetary amounts as separation of amount and currency

Monetary amounts should be best representated as object consisting of the actual amount and the currency.

"money": {
  "amount": 200.00,
  "currency": "USD"

Zalandos Jackson Datatype Money is a implementation for this.