diff --git a/client/i18n/locales/english/intro.json b/client/i18n/locales/english/intro.json
index 53e0a70028e..bb3d129e1a8 100644
--- a/client/i18n/locales/english/intro.json
+++ b/client/i18n/locales/english/intro.json
@@ -4829,6 +4829,12 @@
           "In these lectures, you will learn the fundamentals of JavaScript objects, including how to create them, access their properties, and understand the difference between primitive and non-primitive data types."
         ]
       },
+      "lab-cargo-manifest-validator": {
+        "title": "Build a Cargo Manifest Validator",
+        "intro": [
+          "In this lab, you will use JavaScript to normalize and validate cargo manifests."
+        ]
+      },
       "lecture-working-with-json": {
         "title": "Working with JSON",
         "intro": [
diff --git a/curriculum/challenges/english/blocks/lab-cargo-manifest-validator/69a56b5069ca99f7317e6e19.md b/curriculum/challenges/english/blocks/lab-cargo-manifest-validator/69a56b5069ca99f7317e6e19.md
new file mode 100644
index 00000000000..7ed0a6f8a7e
--- /dev/null
+++ b/curriculum/challenges/english/blocks/lab-cargo-manifest-validator/69a56b5069ca99f7317e6e19.md
@@ -0,0 +1,861 @@
+---
+id: 69a56b5069ca99f7317e6e19
+title: Build a Cargo Manifest Validator
+challengeType: 26
+dashedName: lab-cargo-manifest-validator
+---
+
+# --description--
+
+In this lab, you will use JavaScript to normalize and validate cargo manifests. A cargo manifest is a document that typically lists goods being transported (for example, by ship or train) and includes details about those goods.
+
+Each cargo manifest will be represented as an object with the following properties:
+
+- `containerId`: a positive integer identifying the associated cargo container.
+- `destination`: a non-empty string (after trimming whitespace) denoting the cargo's target destination.
+- `weight`: a positive number representing the cargo's weight.
+- `unit`: a string describing the units for the cargo's weight property (either `"kg"` for kilograms or `"lb"` for pounds).
+- `hazmat`: a boolean value indicating whether hazardous material handling is needed.
+
+Example cargo manifest object:
+
+```js
+{
+  containerId: 1,
+  destination: "Monterey, California, USA",
+  weight: 831,
+  unit: "lb",
+  hazmat: false
+}
+```
+
+**Objective:** Fulfill the user stories below and get all the tests to pass to complete the lab.
+
+**User Stories:**
+
+1. You should implement a function named `normalizeUnits` with a `manifest` parameter.
+    - The function must not mutate the original manifest object and must always return a new object where `weight` is normalized to kilograms and `unit` is set to `"kg"`.
+    - If the weight of the manifest object is expressed in pounds (`unit: "lb"`), the function should convert the `weight` to kilograms using the approximate conversion, 1 lb = 0.45 kg, and update the `unit` accordingly.
+    - If the weight is already expressed in kilograms (`unit: "kg"`), the `weight` and `unit` should remain unchanged.
+2. You should implement a function named `validateManifest` with a `manifest` parameter.
+    - The function must not mutate the original manifest object and must always return a new object.
+    - If the input manifest is valid (no missing or invalid properties), the function should return an empty object.
+    - If the input manifest is not valid, the function should return an object containing entries for each missing or invalid property. Missing properties should have the value `"Missing"` and invalid properties should have the value `"Invalid"`.
+
+    Example return value where the input object is missing the `destination` property and has an invalid `weight` property:
+
+    ```js
+    {
+      destination: "Missing",
+      weight: "Invalid"
+    }
+    ```
+
+3. You should implement a function named `processManifest` with a `manifest` parameter. The function should log:
+    - If the manifest object is valid, `Validation success: ${containerId}` and then the manifest's weight in kilograms as such, `Total weight: ${weight} kg`. Use `normalizeUnits()` for this conversion.
+    - If the manifest object is not valid, `Validation error: ${containerId}` and then the object returned by calling `validateManifest()` with the manifest object.
+    **Note:** each of these two cases should have two `console.log()` calls.
+
+# --before-each--
+
+```js
+const _validManifests = [
+  {
+    containerId: 4,
+    destination: "Monterey, California, USA",
+    weight: 831,
+    unit: "lb",
+    hazmat: false
+  },
+  {
+    containerId: 5,
+    destination: "Montreal, Quebec, Canada",
+    weight: 151,
+    unit: "kg",
+    hazmat: false
+  }
+];
+
+const _invalidManifests = [
+  {
+    containerId: -6,
+    destination: 123,
+    weight: 0,
+    unit: "pounds",
+    hazmat: true
+  },
+  {
+    containerId: 0,
+    weight: -21,
+    unit: "KG"
+  },
+  {
+    containerId: "eight",
+    destination: "Guadalajara, Jalisco, Mexico",
+    weight: 9001,
+    hazmat: "no"
+  },
+  {
+    destination: " ",
+    weight: NaN,
+    unit: "kg",
+    hazmat: 1
+  },
+  {
+    containerId: 10,
+    destination: " ",
+  },
+];
+
+const _testObj = {
+  containerId: 1.51,
+  destination: "Lavender Town",
+  weight: NaN,
+};
+
+console.log = () => {};
+```
+
+# --hints--
+
+You should have a function named `normalizeUnits` with a `manifest` parameter.
+
+```js
+assert.isFunction(normalizeUnits);
+const funcString = normalizeUnits.toString();
+const params = __helpers.getFunctionParams(funcString);
+assert.equal(params.length, 1);
+assert.equal(params[0].name, 'manifest');
+```
+
+Calling `normalizeUnits()` with `{ containerId: 68, destination: "Salinas", weight: 101, unit: "lb", hazmat: true }` should return the new object `{ containerId: 68, destination: "Salinas", weight: 45.45, unit: "kg", hazmat: true }` without mutating the source input.
+
+```js
+const testObj = {
+  containerId: 68,
+  destination: "Salinas", 
+  weight: 101,
+  unit: "lb",
+  hazmat: true
+};
+
+const expected = {
+  containerId: 68,
+  destination: "Salinas",
+  weight: 45.45,
+  unit: "kg",
+  hazmat: true
+};
+
+const copy = normalizeUnits(testObj);
+
+assert.isObject(copy);
+assert.deepEqual(copy, expected, "normalizeUnits() did not return the expected normalized object");
+assert.notStrictEqual(copy, testObj, "normalizeUnits() should return a new object.");
+assert.strictEqual(testObj.containerId, 68, "Original object should not be mutated.");
+assert.strictEqual(testObj.destination, "Salinas", "Original object should not be mutated.");
+assert.strictEqual(testObj.weight, 101, "Original object should not be mutated.");
+assert.strictEqual(testObj.unit, "lb", "Original object should not be mutated.");
+assert.strictEqual(testObj.hazmat, true, "Original object should not be mutated.");
+assert.equal(Object.keys(testObj).length, 5, "Original object should not be mutated.");
+```
+
+Your `normalizeUnits` function should return a copy of the input manifest object with its `weight` normalized to kilograms and its `unit` set to `"kg"`. Use the approximate conversion `1 lb = 0.45 kg` for the weight conversion.
+
+```js
+_validManifests.forEach((obj, i) => {
+  const result = normalizeUnits(obj);
+  assert.isObject(result, "normalizeUnits should return an object");
+  assert.notStrictEqual(result, obj, "normalizeUnits must return a new object, not modify the original");
+  const expectedWeight = obj.unit === "lb" ? obj.weight * 0.45 : obj.weight;
+  const expected = {
+    ...obj,
+    weight: expectedWeight,
+    unit: "kg"
+  };
+
+  assert.deepEqual(
+    result,
+    expected,
+    `normalizeUnits did not return the expected normalized object for manifest at index ${i}`
+  );
+});
+```
+
+Your `normalizeUnits` function should return a new copy of the input `manifest` object without mutating the original.
+
+```js
+const original = {
+  containerId: 151,
+  destination: "Saffron City",
+  weight: 151,
+  unit: "lb",
+  hazmat: false
+};
+
+const expected = {
+  containerId: 151,
+  destination: "Saffron City",
+  weight: 67.95,
+  unit: "kg",
+  hazmat: false
+};
+
+const copy = normalizeUnits(original);
+assert.isObject(copy);
+assert.deepEqual(copy, expected);
+assert.notStrictEqual(copy, original, "normalizeUnits() should return a new object.");
+assert.strictEqual(original.weight, 151, "Original object should not be mutated.");
+assert.strictEqual(original.unit, "lb", "Original object should not be mutated.");
+assert.equal(Object.keys(original).length, 5, "Original object should not be mutated.");
+```
+
+You should have a function named `validateManifest` with a `manifest` parameter.
+
+```js
+assert.isFunction(validateManifest);
+const funcString = validateManifest.toString();
+const params = __helpers.getFunctionParams(funcString);
+assert.equal(params.length, 1);
+assert.equal(params[0].name, 'manifest');
+```
+
+Calling `validateManifest()` with `{ containerId: 1, destination: "Santa Cruz", weight: 304, unit: "kg", hazmat: false }` should return the new object `{}`.
+
+```js
+const testObj = {
+  containerId: 1,
+  destination: "Santa Cruz", 
+  weight: 304,
+  unit: "kg",
+  hazmat: false
+};
+
+const expected = {};
+
+const copy = validateManifest(testObj);
+
+assert.isObject(copy);
+assert.deepEqual(copy, expected, "validateManifest() did not return the expected object for a valid manifest");
+assert.notStrictEqual(copy, testObj, "validateManifest() should return a new object, not mutate the original");
+assert.strictEqual(testObj.containerId, 1, "Original object should not be mutated");
+assert.strictEqual(testObj.destination, "Santa Cruz", "Original object should not be mutated");
+assert.strictEqual(testObj.weight, 304, "Original object should not be mutated");
+assert.strictEqual(testObj.unit, "kg", "Original object should not be mutated");
+assert.strictEqual(testObj.hazmat, false, "Original object should not be mutated");
+```
+
+If the input manifest object is valid, your `validateManifest` function should return an empty object `{}`.
+
+```js
+const solution = {}
+for (const obj of _validManifests) {
+  assert.deepEqual(
+    validateManifest(obj),
+    solution,
+    "validateManifest() should return an empty object for valid manifests."
+  );
+}
+```
+
+Calling `validateManifest()` with `{}` should return the new object `{ containerId: "Missing", destination: "Missing", weight: "Missing", unit: "Missing", hazmat: "Missing" }` without mutating the source input.
+
+```js
+const testObj = {
+};
+
+const expected = {
+  containerId: "Missing",
+  destination: "Missing",
+  weight: "Missing",
+  unit: "Missing",
+  hazmat: "Missing"
+};
+
+const copy = validateManifest(testObj);
+assert.isObject(copy);
+assert.deepEqual(copy, expected, "validateManifest() did not return the expected object for missing properties");
+assert.notStrictEqual(copy, testObj, "validateManifest() should return a new object, not mutate the original");
+assert.equal(Object.keys(testObj).length, 0, "validateManifest() should return a new object, not mutate the original")
+```
+
+Calling `validateManifest()` with `{ containerId: 0, destination: 405, weight: -84, unit: "pounds", hazmat: "no" }` should return the new object `{ containerId: "Invalid", destination: "Invalid", weight: "Invalid", unit: "Invalid", hazmat: "Invalid" }` without mutating the source input.
+
+```js
+const testObj = {
+  containerId: 0,
+  destination: 405,
+  weight: -84,
+  unit: "pounds",
+  hazmat: "no"
+};
+
+const expected = {
+  containerId: "Invalid",
+  destination: "Invalid",
+  weight: "Invalid",
+  unit: "Invalid",
+  hazmat: "Invalid"
+};
+
+const copy = validateManifest(testObj);
+assert.isObject(copy);
+assert.deepEqual(copy, expected, "validateManifest() did not return the expected object for invalid properties");
+assert.notStrictEqual(copy, testObj, "validateManifest() should return a new object, not mutate the original");
+assert.strictEqual(testObj.containerId, 0, "Original object should not be mutated");
+assert.strictEqual(testObj.destination, 405, "Original object should not be mutated");
+assert.strictEqual(testObj.weight, -84, "Original object should not be mutated");
+assert.strictEqual(testObj.unit, "pounds", "Original object should not be mutated");
+assert.strictEqual(testObj.hazmat, "no", "Original object should not be mutated");
+```
+
+Calling `validateManifest()` with `{ containerId: -2 }` should return the new object `{ containerId: "Invalid", destination: "Missing", weight: "Missing", unit: "Missing", hazmat: "Missing" }` without mutating the source input.
+
+```js
+const testObj = {
+  containerId: -2,
+};
+
+const expected = {
+  containerId: "Invalid",
+  destination: "Missing",
+  weight: "Missing",
+  unit: "Missing",
+  hazmat: "Missing"
+};
+
+const copy = validateManifest(testObj);
+assert.isObject(copy);
+assert.deepEqual(copy, expected, "validateManifest() did not return the expected object for invalid and missing properties");
+assert.notStrictEqual(copy, testObj, "validateManifest() should return a new object, not mutate the original");
+assert.strictEqual(testObj.containerId, -2, "Original object should not be mutated");
+assert.equal(Object.keys(testObj).length, 1, "Original object should not be mutated");
+```
+
+Calling `validateManifest()` with `{ containerId: 3.50 }` should return the new object `{ containerId: "Invalid", destination: "Missing", weight: "Missing", unit: "Missing", hazmat: "Missing" }` without mutating the source input. You can use `Number.isInteger()` to validate integer values.
+
+```js
+const testObj = {
+  containerId: 3.50,
+};
+
+const expected = {
+  containerId: "Invalid",
+  destination: "Missing",
+  weight: "Missing",
+  unit: "Missing",
+  hazmat: "Missing"
+};
+
+const copy = validateManifest(testObj);
+assert.isObject(copy);
+assert.deepEqual(copy, expected, "validateManifest() did not return the expected object for invalid and missing properties");
+assert.notStrictEqual(copy, testObj, "validateManifest() should return a new object, not mutate the original");
+assert.strictEqual(testObj.containerId, 3.50, "Original object should not be mutated");
+assert.equal(Object.keys(testObj).length, 1, "Original object should not be mutated");
+```
+
+Calling `validateManifest()` with `{ destination: "  " }` should return the new object `{ containerId: "Missing", destination: "Invalid", weight: "Missing", unit: "Missing", hazmat: "Missing" }` without mutating the source input. You can use `String.trim()` to remove whitespace from a string.
+
+```js
+const testObj = {
+  destination: "  ",
+};
+
+const expected = {
+  containerId: "Missing",
+  destination: "Invalid",
+  weight: "Missing",
+  unit: "Missing",
+  hazmat: "Missing"
+};
+
+const copy = validateManifest(testObj);
+assert.isObject(copy);
+assert.deepEqual(copy, expected, "validateManifest() did not return the expected object for invalid and missing properties");
+assert.notStrictEqual(copy, testObj, "validateManifest() should return a new object, not mutate the original");
+assert.strictEqual(testObj.destination, "  ", "Original object should not be mutated");
+assert.equal(Object.keys(testObj).length, 1, "Original object should not be mutated");
+```
+
+Calling `validateManifest()` with `{ weight: NaN }` should return the new object `{ containerId: "Missing", destination: "Missing", weight: "Invalid", unit: "Missing", hazmat: "Missing" }` without mutating the source input. You can use `Number.isNaN()` to validate NaN values.
+
+```js
+const testObj = {
+  weight: NaN,
+};
+
+const expected = {
+  containerId: "Missing",
+  destination: "Missing",
+  weight: "Invalid",
+  unit: "Missing",
+  hazmat: "Missing"
+};
+
+const copy = validateManifest(testObj);
+assert.isObject(copy);
+assert.deepEqual(copy, expected, "validateManifest() did not return the expected object for invalid and missing properties");
+assert.notStrictEqual(copy, testObj, "validateManifest() should return a new object, not mutate the original");
+assert.ok(Number.isNaN(testObj.weight), "Original object should not be mutated");
+assert.equal(Object.keys(testObj).length, 1, "Original object should not be mutated");
+```
+
+If the input manifest object is not valid, your `validateManifest` function should return an object describing missing and/or invalid properties.
+
+```js
+const solutions = [
+  { containerId: 'Invalid', destination: 'Invalid', weight: 'Invalid', unit: 'Invalid' },
+  { containerId: 'Invalid', destination: 'Missing', weight: 'Invalid', unit: 'Invalid', hazmat: 'Missing' },
+  { containerId: 'Invalid', unit: 'Missing', hazmat: 'Invalid' },
+  { containerId: 'Missing', destination: 'Invalid', weight: 'Invalid', hazmat: 'Invalid' },
+  { destination: 'Invalid', weight: 'Missing', unit: 'Missing', hazmat: 'Missing' }
+];
+
+let i = 0;
+for (const obj of _invalidManifests) {
+  const result = validateManifest(obj);
+  assert.deepEqual(
+    result,
+    solutions[i],
+    "validateManifest() should return an object with errors for invalid manifests."
+  );
+  i += 1;
+}
+```
+
+Your `validateManifest` function should return a new object without mutating the original.
+
+```js
+const invalidOriginal = {
+  containerId: -151,
+  destination: "",
+  weight: -151,
+  unit: "kilograms",
+  hazmat: "idk"
+};
+
+const validOriginal = {
+  containerId: 151,
+  destination: "Pallet Town",
+  weight: 151,
+  unit: "kg",
+  hazmat: false
+};
+
+const res0 = validateManifest(invalidOriginal);
+assert.isObject(res0);
+assert.notStrictEqual(res0, invalidOriginal, "validateManifest() should return a new object.");
+assert.strictEqual(invalidOriginal.containerId, -151, "Original object should not be mutated.");
+assert.strictEqual(invalidOriginal.destination, "", "Original object should not be mutated.");
+assert.strictEqual(invalidOriginal.weight, -151, "Original object should not be mutated.");
+assert.strictEqual(invalidOriginal.unit, "kilograms", "Original object should not be mutated.");
+assert.strictEqual(invalidOriginal.hazmat, "idk", "Original object should not be mutated.");
+assert.equal(Object.keys(invalidOriginal).length, 5, "Original object should not be mutated.");
+
+const res1 = validateManifest(validOriginal);
+assert.isObject(res1);
+assert.notStrictEqual(res1, validOriginal, "validateManifest() should return a new object.");
+assert.strictEqual(validOriginal.containerId, 151, "Original object should not be mutated.");
+assert.strictEqual(validOriginal.destination, "Pallet Town", "Original object should not be mutated.");
+assert.strictEqual(validOriginal.weight, 151, "Original object should not be mutated.");
+assert.strictEqual(validOriginal.unit, "kg", "Original object should not be mutated.");
+assert.strictEqual(validOriginal.hazmat, false, "Original object should not be mutated.");
+assert.equal(Object.keys(validOriginal).length, 5, "Original object should not be mutated.");
+```
+
+You should have a function named `processManifest` with a `manifest` parameter.
+
+```js
+assert.isFunction(processManifest);
+const funcString = processManifest.toString();
+const params = __helpers.getFunctionParams(funcString);
+assert.equal(params.length, 1);
+assert.equal(params[0].name, 'manifest');
+```
+
+Calling `processManifest()` with `{ containerId: 55, destination: "Carmel", weight: 400, unit: "lb", hazmat: false }` should first log `"Validation success: 55"` and then log `"Total weight: 180 kg"`.
+
+```js
+const testObj = {
+  containerId: 55,
+  destination: "Carmel",
+  weight: 400,
+  unit: "lb",
+  hazmat: false
+};
+
+const spy = __helpers.spyOn(console, "log");
+
+try {
+  processManifest(testObj);
+
+  const expectedCalls = [
+    ["Validation success: 55"],
+    ["Total weight: 180 kg"]
+  ];
+  assert.deepEqual(spy.calls[0], expectedCalls[0], "First log should be the validation success message");
+  assert.deepEqual(spy.calls[1], expectedCalls[1], "Second log should be the normalized weight in kg");
+
+} catch (err) {
+  assert.fail(err);
+} finally {
+  spy.restore();
+}
+```
+
+If the input manifest object is valid, your `processManifest` function should first log the success message, `Validation success: ${containerId}`. 
+
+```js
+const testObj = {
+  containerId: 97,
+  destination: "Cerulean City",
+  weight: 200,
+  unit: "lb",
+  hazmat: false
+}
+
+const spy = __helpers.spyOn(console, "log");
+
+try {
+  processManifest(testObj);
+  const expectedCalls = [
+    ["Validation success: 97"],
+    ["Total weight: 90 kg"],
+  ]
+  assert.deepEqual(spy.calls[0], expectedCalls[0]);
+
+} catch (err) {
+  assert.fail(err);
+} finally {
+  spy.restore();
+}
+```
+
+If the input manifest object is valid, your `processManifest` function should normalize it to kilograms using `normalizeUnits()` and then log: `Total weight: ${weight} kg`.
+
+```js
+const testObj = {
+  containerId: 97,
+  destination: "Cerulean City",
+  weight: 200,
+  unit: "lb",
+  hazmat: false
+}
+
+const spy = __helpers.spyOn(console, "log");
+
+try {
+  processManifest(testObj);
+  const expectedCalls = [
+    ["Validation success: 97"],
+    ["Total weight: 90 kg"],
+  ]
+  assert.deepEqual(spy.calls[1], expectedCalls[1]);
+
+} catch (err) {
+  assert.fail(err);
+} finally {
+  spy.restore();
+}
+```
+
+If the input manifest object is valid, your `processManifest` function should log a success message with the object's `containerId`, and then log the object's `weight` in kilograms. You should use `normalizeUnits()` for the conversion and have two `console.log()` calls.
+
+```js
+const originalNormalize = normalizeUnits;
+let called = false;
+try {
+  normalizeUnits = function (...args) {
+    called = true;
+    return originalNormalize(...args);
+  };
+
+  processManifest(_validManifests[0]);
+
+  assert.isTrue(
+    called,
+    "processManifest should call normalizeUnits() when the manifest is valid"
+  );
+
+} catch (err) {
+  assert.fail(err);
+} finally {
+  normalizeUnits = originalNormalize;
+}
+
+const spy = __helpers.spyOn(console, "log");
+
+try {
+  for (const obj of _validManifests) {
+    processManifest(obj);
+  }
+  const expectedCalls = [
+    ["Validation success: 4"],
+    ["Total weight: 373.95 kg"],
+    ["Validation success: 5"],
+    ["Total weight: 151 kg"],
+  ]
+  assert.deepEqual(spy.calls, expectedCalls);
+
+} catch (err) {
+  assert.fail(err);
+} finally {
+  spy.restore();
+}
+```
+
+Calling `processManifest()` with `{ containerId: -88, destination: "Soledad", weight: NaN }` should first log `Validation error: -88` and then log the object `{ containerId: "Invalid", weight: "Invalid", unit: "Missing", hazmat: "Missing" }`.
+
+```js
+const testObj = {
+  containerId: -88,
+  destination: "Soledad",
+  weight: NaN
+};
+
+const spy = __helpers.spyOn(console, "log");
+
+try {
+  processManifest(testObj);
+  const expectedCalls = [
+    ["Validation error: -88"],
+    [{
+        containerId: "Invalid",
+        weight: "Invalid",
+        unit: "Missing",
+        hazmat: "Missing"
+    }]
+  ];
+
+  assert.deepEqual(spy.calls[0], expectedCalls[0], "First log should be the validation error message");
+  assert.deepEqual(spy.calls[1], expectedCalls[1], "Second log should be the validation result object");
+
+} catch (err) {
+  assert.fail(err);
+} finally {
+  spy.restore();
+}
+```
+
+Calling `processManifest()` with `{ destination: "Watsonville", hazmat: true }` should first log `Validation error: undefined` and then log the object `{ containerId: "Missing", weight: "Missing", unit: "Missing" }`.
+
+```js
+const testObj = {
+  destination: "Watsonville",
+  hazmat: true
+};
+
+const spy = __helpers.spyOn(console, "log");
+
+try {
+  processManifest(testObj);
+  const expectedCalls = [
+    ["Validation error: undefined"],
+    [{
+        containerId: "Missing",
+        weight: "Missing",
+        unit: "Missing"
+    }]
+  ];
+
+  assert.deepEqual(spy.calls[0], expectedCalls[0], "First log should be the validation error message");
+  assert.deepEqual(spy.calls[1], expectedCalls[1], "Second log should be the validation result object");
+
+} catch (err) {
+  assert.fail(err);
+} finally {
+  spy.restore();
+}
+```
+
+If the input manifest object is not valid, your `processManifest` function should first log the error message, `Validation error: ${containerId}`. 
+
+```js
+const spy = __helpers.spyOn(console, "log");
+
+try {
+  processManifest(_testObj);
+  const expectedCalls = [
+    ["Validation error: 1.51"],
+    [{
+        containerId: "Invalid",
+        weight: "Invalid",
+        unit: "Missing",
+        hazmat: "Missing"
+    }]
+  ];
+  assert.deepEqual(spy.calls[0], expectedCalls[0]);
+
+} catch (err) {
+  assert.fail(err);   
+} finally {
+  spy.restore();
+}
+```
+
+If the input manifest object is not valid, your `processManifest` function should also log the object returned by calling `validateManifest()` with the original manifest object. Call `console.log()` directly with the returned object.
+
+```js
+const originalValidate = validateManifest;
+let called = false;
+
+try {
+  validateManifest = function (...args) {
+    called = true;
+    return originalValidate(...args);
+  };
+
+  processManifest(_invalidManifests[0]);
+
+  assert.isTrue(
+    called,
+    "processManifest should call validateManifest() when the manifest is invalid"
+  );
+
+} catch (err) {
+  assert.fail(err);
+} finally {
+  validateManifest = originalValidate;
+}
+
+const spy = __helpers.spyOn(console, "log");
+
+try {
+  processManifest(_testObj);
+  const expectedCalls = [
+    ["Validation error: 1.51"],
+    [{
+        containerId: "Invalid",
+        weight: "Invalid",
+        unit: "Missing",
+        hazmat: "Missing"
+    }]
+  ];
+  assert.deepEqual(spy.calls[1], expectedCalls[1]);
+
+} catch (err) {
+  assert.fail(err);   
+} finally {
+  spy.restore();
+}
+```
+
+If the input manifest object is not valid, your `processManifest` function should log an error message with the object's `containerId`, and then log the object returned by calling `validateManifest()` with the input object. This should involve two `console.log()` calls.
+
+```js
+const originalValidate = validateManifest;
+let called = false;
+
+try {
+  validateManifest = function (...args) {
+    called = true;
+    return originalValidate(...args);
+  };
+
+  processManifest(_invalidManifests[0]);
+
+  assert.isTrue(
+    called,
+    "processManifest should call validateManifest() when the manifest is invalid"
+  );
+
+} catch (err) {
+  assert.fail(err);
+} finally {
+  validateManifest = originalValidate;
+}
+
+const spy = __helpers.spyOn(console, "log");
+
+try {
+  processManifest(_testObj);
+  const expectedCalls = [
+    ["Validation error: 1.51"],
+    [{
+        containerId: "Invalid",
+        weight: "Invalid",
+        unit: "Missing",
+        hazmat: "Missing"
+    }]
+  ];
+  assert.deepEqual(spy.calls, expectedCalls);
+
+} catch (err) {
+  assert.fail(err);   
+} finally {
+  spy.restore();
+}
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+
+```
+
+# --solutions--
+
+```js
+function normalizeUnits(manifest) {
+  const normalized = {
+    ...manifest
+  }
+  if (normalized.unit === "lb") {
+    normalized.weight = normalized.weight * 0.45;
+    normalized.unit = "kg";
+  }
+  return normalized;
+}
+
+function validateManifest(manifest) {
+  const result = {}
+
+  if (manifest.containerId === undefined) {
+    result.containerId = "Missing";
+  } else if (
+    typeof manifest.containerId !== "number" ||
+    !Number.isInteger(manifest.containerId) ||
+    manifest.containerId <= 0
+  ) {
+    result.containerId = "Invalid";
+  }
+  if (manifest.destination === undefined) {
+    result.destination = "Missing";
+  } else if (typeof manifest.destination !== "string" || manifest.destination.trim() === "") {
+    result.destination = "Invalid";
+  }
+  if (manifest.weight === undefined) {
+    result.weight = "Missing";
+  } else if (typeof manifest.weight !== "number" || manifest.weight <= 0 || Number.isNaN(manifest.weight)) {
+    result.weight = "Invalid";
+  }
+  if (manifest.unit === undefined) {
+    result.unit = "Missing";
+  } else if (manifest.unit !== "kg" && manifest.unit !== "lb") {
+    result.unit = "Invalid";
+  }
+  if (manifest.hazmat === undefined) {
+    result.hazmat = "Missing";
+  } else if (typeof manifest.hazmat !== "boolean") {
+    result.hazmat = "Invalid";
+  }
+
+  return result;
+}
+
+function processManifest(manifest) {
+  const validation = validateManifest(manifest);
+
+  if (Object.keys(validation).length > 0) {
+    console.log(`Validation error: ${manifest.containerId}`);
+    console.log(validation);
+  } else {
+    const normalized = normalizeUnits(manifest);
+    console.log(`Validation success: ${manifest.containerId}`);
+    console.log(`Total weight: ${normalized.weight} kg`);
+  }
+}
+```
diff --git a/curriculum/structure/blocks/lab-cargo-manifest-validator.json b/curriculum/structure/blocks/lab-cargo-manifest-validator.json
new file mode 100644
index 00000000000..16cf7015ba3
--- /dev/null
+++ b/curriculum/structure/blocks/lab-cargo-manifest-validator.json
@@ -0,0 +1,14 @@
+{
+  "isUpcomingChange": false,
+  "dashedName": "lab-cargo-manifest-validator",
+  "helpCategory": "JavaScript",
+  "blockLayout": "link",
+  "challengeOrder": [
+    {
+      "id": "69a56b5069ca99f7317e6e19",
+      "title": "Build a Cargo Manifest Validator"
+    }
+  ],
+  "blockLabel": "lab",
+  "usesMultifileEditor": true
+}
diff --git a/curriculum/structure/superblocks/javascript-v9.json b/curriculum/structure/superblocks/javascript-v9.json
index 4c8ff578df4..96e93e26c77 100644
--- a/curriculum/structure/superblocks/javascript-v9.json
+++ b/curriculum/structure/superblocks/javascript-v9.json
@@ -82,6 +82,7 @@
           "dashedName": "javascript-objects",
           "blocks": [
             "lecture-introduction-to-javascript-objects-and-their-properties",
+            "lab-cargo-manifest-validator",
             "lecture-working-with-json",
             "lecture-working-with-optional-chaining-and-object-destructuring",
             "workshop-recipe-tracker",