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src/main.rs

@@ -1,4 +1,3 @@
-
 use axum::{
     extract::{rejection::JsonRejection, State},
     http::StatusCode,
@@ -34,6 +33,9 @@ enum ValidationMode {
 struct FieldSpec {
     #[serde(rename = "type")]
     data_type: DataType,
+
+    #[serde(default, skip_serializing_if = "Option::is_none")]
+    value: Option<Value>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -122,6 +124,15 @@ fn validate_data(data: &Value, schema: &SchemaConfig) -> Result<(), String> {
                 type_name(&spec.data_type)
             ));
         }
+
+        if let Some(expected) = &spec.value {
+            if value != expected {
+                return Err(format!(
+                    "Field '{key}' must equal {}",
+                    expected
+                ));
+            }
+        }
     }
 
     if matches!(schema.mode, ValidationMode::Strict) {
@@ -405,4 +416,4 @@ async fn main() {
     axum::serve(listener, app)
         .await
         .expect("HTTP server failed");
-}
+}