finished it

index.js

@@ -6,7 +6,7 @@ const data = "./data.json";
 
 app.use(express.json());
 
-// Add Access Control Allow Origin headers
+// Add Access Control Allow Origin headers AAAAAAAAAAAAAAAAAAAAAA
 app.use((req, res, next) => {
   res.setHeader("Access-Control-Allow-Origin", "*");
   res.header(
@@ -16,6 +16,7 @@ app.use((req, res, next) => {
   next();
 });
 
+// Returns the contents of 'data.json' when client makes a GET req @ /api/text
 app.get("/api/text", (req, res) => {
   fs.readFile("data.json", "utf8", (err, data) => {
     if (err) {
@@ -26,73 +27,97 @@ app.get("/api/text", (req, res) => {
   });
 });
 
+// Accepts a JSON array of utf-8 character codes, and adds it to the array in data.json
 app.post("/api/add", (req, res) => {
-  let content = {};
+  let text = "";
   if (req.body) {
-    content = req.body;
+    text = req.body;
+    console.log("REQUESTED TEXT: " + text);
   } else {
-    console.log("AAAA");
+    // returns when theres no body
+    console.log("ERROR (add call): THERES NO BODY");
     res.send("ERROR: NO BODY SPECIFIED");
     return;
   }
-  let text = content.text;
 
+  // read the data.json file, store contents in data parameter
   fs.readFile("data.json", "utf8", (err, data) => {
     if (err) {
       res.send(err);
       return;
     }
-    let array = JSON.parse(data)["text-array"];
-    array.push(text);
-    let arrjson = '{"text-array": [';
-    for (let i in array) {
-      if (i == array.length - 1) {
-        arrjson += '"' + array[i] + '"';
-      } else {
-        arrjson += '"' + array[i] + '",';
-      }
+
+    // convert the raw json into a JS object
+    let storedArray = JSON.parse(data);
+    console.log("JSON ARRAY READ FROM data.json: ", storedArray);
+
+    let newArray = [];
+    // add each element of the read data and add it to newArray
+    for (let i in storedArray) {
+      newArray.push(storedArray[i]);
     }
-    arrjson += "]}";
 
+    // add the requested text
+    newArray.push(text);
+    console.log("JS ARRAY AFTER CHANGES: ", newArray);
+
+    let arrjson = JSON.stringify(newArray);
+    console.log("JSON ARRAY TO WRITE: ", arrjson);
+
+    // write the JSON array to data.json
     fs.writeFileSync("data.json", arrjson);
 
+    // send back the input (for no reason)
     res.send(text);
   });
 });
 
 app.post("/api/remove", (req, res) => {
-  let content = {};
+  let id = null;
   if (req.body) {
-    content = req.body;
+    id = req.body;
+    console.log("REQUESTBODY: ", req.body);
   } else {
+    // return when theres no body
+    console.log("ERROR (remove call): THERES NO BODY");
     res.send("ERROR: NO BODY SPECIFIED");
     return;
   }
-  let id = content.id;
-  console.log(id);
+  // the body looks like:  { "id": 3 }, so we need to convert it to a number
+  id = id["id"];
+  console.log("REQUESTED ID: ", id);
 
+  // read the data from json file
   fs.readFile("data.json", "utf8", (err, data) => {
     if (err) {
       res.send(err);
       return;
     }
-    let array = JSON.parse(data)["text-array"];
-    array.splice(id, 1);
-    let arrjson = '{"text-array": [';
-    for (let i in array) {
-      if (i == array.length - 1) {
-        arrjson += '"' + array[i] + '"';
-      } else {
-        arrjson += '"' + array[i] + '",';
-      }
+
+    // convert raw JSON data into a JS object
+    let storedArray = JSON.parse(data);
+    console.log("JSON ARRAY READ FROM data.json: ", storedArray);
+
+    // add each element of the read data and add it to newArray
+    let newArray = [];
+    for (let i in storedArray) {
+      newArray.push(storedArray[i]);
     }
-    arrjson += "]}";
+
+    // remove the requested ID
+    newArray.splice(id, 1);
+    console.log("JS ARRAY AFTER CHANGES: ", newArray);
+
+    let arrjson = JSON.stringify(newArray);
+    console.log("JSON ARRAY TO WRITE: ", arrjson);
+
     fs.writeFileSync("data.json", arrjson);
   });
-
-  res.send("Removed element at id: " + id);
+  // send back id for no reason
+  res.send(id);
 });
 
+// listen for requests
 app.listen(port, () => {
   console.log(`Example app listening on port ${port}`);
 });