`{\"customerId\":\"123\",\"id\":\"registration\",\...

# getting-started

[Aminu Babayo Shehu]

{\"customerId\":\"123\",\"id\":\"registration\",\"value\":0,\"balance\":0,\"expirationDate\":1675122800125}
Please how to convert the above string to this Promotion object

sealed class Promotion(customerId: String, id: String, value: BigDecimal, balance: BigDecimal, expirationDate: Timestamp)

[Sam]

Looks like a JSON string, so you could use something like #serialization or #jackson-kotlin to deserialize it to an object.

[Aminu Babayo Shehu]

can i use fasterxml?

[Sam]

The #jackson-kotlin module is an extension for the FasterXML Jackson library to enable it to work better with Kotlin classes. Yes, you could use it for this.

[Aminu Babayo Shehu]

okay thank you, let me try

[Aminu Babayo Shehu]

Do you is the method?

val promotions = jacksonObjectMapper().readValue(promotion, Promotion::class.java)

[Sam]

👍 that should work. You might need to make your class a data class instead of a sealed class, though.

[Aminu Babayo Shehu]

and also @Serializable right?

[Sam]

You don’t need that annotation if you’re using Jackson. That would only be needed if you choose to use Kotlin #serialization instead.

[Aminu Babayo Shehu]

ohk, thank you Sir

[Aminu Babayo Shehu]

Please what do you think if the string is in this format {{\"customerId\":\"123\",\"id\":\"registration\",\"value\":0,\"balance\":0,\"expirationDate\":1675086187278}, {\"customerId\":\"124\",\"id\":\"registration\",\"value\":0,\"balance\":0,\"expirationDate\":1675086187278}}

[Sam]

That looks a bit odd. It seems like a list containing two objects, but a JSON list is supposed to be in square brackets [], not braces {}. If you had a valid JSON list, you could do jacksonObjectMapper().readValue<List<Promotion>>(promotions). If your list really does have braces instead of square brackets, it’s not valid JSON and you would need to fix it before passing it to a JSON deserializer.

[Aminu Babayo Shehu]

ohk, thank you Sir