diff --git a/li.strolch.model/src/main/java/li/strolch/model/json/SetParameterValueFromJsonVisitor.java b/li.strolch.model/src/main/java/li/strolch/model/json/SetParameterValueFromJsonVisitor.java
new file mode 100644
index 000000000..56ed44e70
--- /dev/null
+++ b/li.strolch.model/src/main/java/li/strolch/model/json/SetParameterValueFromJsonVisitor.java
@@ -0,0 +1,187 @@
+package li.strolch.model.json;
+
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import li.strolch.model.parameter.*;
+import li.strolch.model.visitor.ParameterVisitor;
+import li.strolch.utils.iso8601.ISO8601;
+import li.strolch.utils.time.PeriodDuration;
+
+public class SetParameterValueFromJsonVisitor implements ParameterVisitor<Void> {
+
+	private final JsonObject container;
+	private final boolean ignoreMissing;
+
+	public SetParameterValueFromJsonVisitor(JsonObject container, boolean ignoreMissing) {
+		this.container = container;
+		this.ignoreMissing = ignoreMissing;
+	}
+
+	private boolean isMissing(Parameter<?> param) {
+		if (this.ignoreMissing && !this.container.has(param.getId()))
+			return true;
+		if (!this.container.has(param.getId()))
+			throw new IllegalStateException("Field " + param.getId() + " is missing on json data!");
+		return false;
+	}
+
+	private boolean isNotSet(Parameter<?> param) {
+		return !this.container.has(param.getId()) || this.container.get(param.getId()).isJsonNull();
+	}
+
+	@Override
+	public Void visitBooleanParam(BooleanParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param))
+			param.clear();
+		else
+			param.setValue(this.container.get(param.getId()).getAsBoolean());
+		return null;
+	}
+
+	@Override
+	public Void visitDateParam(DateParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param))
+			param.clear();
+		else
+			param.setValue(ISO8601.parseToDate(this.container.get(param.getId()).getAsString()));
+		return null;
+	}
+
+	@Override
+	public Void visitDurationParam(DurationParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param))
+			param.clear();
+		else
+			param.setValue(PeriodDuration.parse(this.container.get(param.getId()).getAsString()));
+		return null;
+	}
+
+	@Override
+	public Void visitFloatParam(FloatParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param))
+			param.clear();
+		else
+			param.setValue(this.container.get(param.getId()).getAsDouble());
+		return null;
+	}
+
+	@Override
+	public Void visitIntegerParam(IntegerParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param))
+			param.clear();
+		else
+			param.setValue(this.container.get(param.getId()).getAsInt());
+		return null;
+	}
+
+	@Override
+	public Void visitLongParam(LongParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param))
+			param.clear();
+		else
+			param.setValue(this.container.get(param.getId()).getAsLong());
+		return null;
+	}
+
+	@Override
+	public Void visitStringParam(StringParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param))
+			param.clear();
+		else
+			param.setValue(this.container.get(param.getId()).getAsString());
+		return null;
+	}
+
+	@Override
+	public Void visitTextParam(TextParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param))
+			param.clear();
+		else
+			param.setValue(this.container.get(param.getId()).getAsString());
+		return null;
+	}
+
+	@Override
+	public Void visitStringListParam(StringListParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param)) {
+			param.clear();
+		} else {
+			JsonElement listJ = this.container.get(param.getId());
+			param.clear();
+			if (listJ.isJsonPrimitive())
+				param.setValueFromString(listJ.getAsString());
+			else
+				listJ.getAsJsonArray().forEach(e -> param.addValue(e.getAsString()));
+		}
+		return null;
+	}
+
+	@Override
+	public Void visitIntegerListParam(IntegerListParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param)) {
+			param.clear();
+		} else {
+			JsonElement listJ = this.container.get(param.getId());
+			param.clear();
+			if (listJ.isJsonPrimitive())
+				param.setValueFromString(listJ.getAsString());
+			else
+				listJ.getAsJsonArray().forEach(e -> param.addValue(e.getAsInt()));
+		}
+		return null;
+	}
+
+	@Override
+	public Void visitFloatListParam(FloatListParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param)) {
+			param.clear();
+		} else {
+			JsonElement listJ = this.container.get(param.getId());
+			param.clear();
+			if (listJ.isJsonPrimitive())
+				param.setValueFromString(listJ.getAsString());
+			else
+				listJ.getAsJsonArray().forEach(e -> param.addValue(e.getAsDouble()));
+		}
+		return null;
+	}
+
+	@Override
+	public Void visitLongListParam(LongListParameter param) {
+		if (isMissing(param))
+			return null;
+		if (isNotSet(param)) {
+			param.clear();
+		} else {
+			JsonElement listJ = this.container.get(param.getId());
+			param.clear();
+			if (listJ.isJsonPrimitive())
+				param.setValueFromString(listJ.getAsString());
+			else
+				listJ.getAsJsonArray().forEach(e -> param.addValue(e.getAsLong()));
+		}
+		return null;
+	}
+}