diff --git a/dev-scripts/Cargo.toml b/dev-scripts/Cargo.toml
index 28a890d..5b85e41 100644
--- a/dev-scripts/Cargo.toml
+++ b/dev-scripts/Cargo.toml
@@ -14,6 +14,7 @@ networking = { path = "../internal/networking" }
 serde = "1.0"
 serde_json = "1.0"
 bincode = "1.3"
-zip = "0.6"
+untwine = "0.4"
 rayon = "1.10"
 regex = "1.10"
+zip = "0.6"
diff --git a/dev-scripts/src/main.rs b/dev-scripts/src/main.rs
index dbd02ac..13819c1 100644
--- a/dev-scripts/src/main.rs
+++ b/dev-scripts/src/main.rs
@@ -12,6 +12,7 @@ mod update_docs;
 mod update_hash;
 mod default_layout;
 mod layout;
+mod parser;
 
 
 #[derive(Clone, Parser)]
diff --git a/dev-scripts/src/parser.rs b/dev-scripts/src/parser.rs
new file mode 100644
index 0000000..4b15b3e
--- /dev/null
+++ b/dev-scripts/src/parser.rs
@@ -0,0 +1,56 @@
+use std::{
+    collections::HashMap,
+    num::{ParseFloatError, ParseIntError},
+};
+
+use untwine::{parser, parser_repl};
+
+#[derive(Debug)]
+pub enum JSONValue {
+    String(String),
+    Null,
+    Int(i128),
+    Float(f64),
+    Bool(bool),
+    List(Vec<JSONValue>),
+    Map(HashMap<String, JSONValue>),
+}
+
+impl JSONValue {
+    pub fn string(self) -> Option<String> {
+        match self {
+            JSONValue::String(s) => Some(s),
+            _ => None,
+        }
+    }
+}
+
+#[derive(Debug, thiserror::Error)]
+enum ParseJSONError {
+    #[error("Syntax error: {0}")]
+    Untwine(#[from] untwine::ParserError),
+    #[error("Failed to parse number: {0}")]
+    ParseInt(#[from] ParseIntError),
+    #[error("Failed to parse number: {0}")]
+    ParseFloat(#[from] ParseFloatError),
+}
+
+parser! {
+    [error = ParseJSONError]
+    sep = #{char::is_ascii_whitespace}*;
+    comma = sep "," sep;
+    int: num=<"-"? '0'-'9'+> -> JSONValue { JSONValue::Int(num.parse()?) }
+    float: num=<"-"? '0'-'9'+ "." '0'-'9'+> -> JSONValue { JSONValue::Float(num.parse()?) }
+    str_char = ("\\" . | [^"\""]) -> char;
+    str: "\"" chars=str_char* "\"" -> JSONValue { JSONValue::String(chars.into_iter().collect()) }
+    null: "null" -> JSONValue { JSONValue::Null }
+    bool: bool=<"true" | "false"> -> JSONValue { JSONValue::Bool(bool == "true") }
+    list: "[" sep values=json$comma* sep "]" -> JSONValue { JSONValue::List(values) }
+    map_entry: key=str sep ":" sep value=json -> (String, JSONValue) { (key.string().unwrap(), value) }
+    map: "{" sep values=map_entry$comma* sep "}" -> JSONValue { JSONValue::Map(values.into_iter().collect()) }
+    pub json = (bool | null | str | float | int | list | map) -> JSONValue;
+}
+
+fn main() {
+    parser_repl(json);
+}
\ No newline at end of file
diff --git a/internal/backend/src/datasource.rs b/internal/backend/src/datasource.rs
new file mode 100644
index 0000000..907ef95
--- /dev/null
+++ b/internal/backend/src/datasource.rs
@@ -0,0 +1,4 @@
+// TODO: use
+trait Datasource {
+    fn get(&self, coordinates: &Coordinates, settings: Settings) -> crate::Result<WeatherForecast>;
+}