# Quickstart Parse your first JSON document with the DOM and On-Demand APIs. Create a `SimdJsonParser`, parse some JSON, and read values out of the result. The parser holds native resources on some backends, so always close it. The idiomatic way is Kotlin's [`use`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io/use.html). ## DOM: parse into a tree `parse` reads the whole document into an immutable tree of `JsonValue`s: ```kotlin import io.github.devcrocod.simdjson.* val json = """{ "name": "simdjson-kotlin", "stars": 42, "fast": true }""" SimdJsonParser().use { parser -> val root = parser.parse(json) as JsonObject println((root["name"] as JsonString).value) // simdjson-kotlin println((root["stars"] as JsonNumber).toLong()) // 42 println((root["fast"] as JsonBoolean).value) // true } ``` ## On-Demand: decode only what you touch `iterate` returns a lazy, forward-only document. Values are decoded only when you access them, and nothing builds a full tree: ```kotlin SimdJsonParser().use { parser -> parser.iterate(json).use { doc -> val root = doc.getObject() println(root["name"].getString()) // simdjson-kotlin println(root["stars"].getLong()) // 42 println(root["fast"].getBoolean()) // true } } ```