freeCodeCamp/curriculum/challenges/english/05-back-end-development-and-apis/back-end-development-and-apis-projects/exercise-tracker.md

---
id: 5a8b073d06fa14fcfde687aa
title: Exercise Tracker
challengeType: 4
forumTopicId: 301505
dashedName: exercise-tracker
---

# --description--

Build a full stack JavaScript app that is functionally similar to this: <https://exercise-tracker.freecodecamp.rocks/>. Working on this project will involve you writing your code using one of the following methods:

-   Clone [this GitHub repo](https://github.com/freeCodeCamp/boilerplate-project-exercisetracker/) and complete your project locally.
-   Use [our Replit starter project](https://replit.com/github/freeCodeCamp/boilerplate-project-exercisetracker) to complete your project.
-   Use a site builder of your choice to complete the project. Be sure to incorporate all the files from our GitHub repo.

When you are done, make sure a working demo of your project is hosted somewhere public. Then submit the URL to it in the `Solution Link` field. Optionally, also submit a link to your project's source code in the `GitHub Link` field.

# --instructions--

Your responses should have the following structures.

Exercise:

```js
{
  username: "fcc_test",
  description: "test",
  duration: 60,
  date: "Mon Jan 01 1990",
  _id: "5fb5853f734231456ccb3b05"
}
```

User:

```js
{
  username: "fcc_test",
  _id: "5fb5853f734231456ccb3b05"
}
```

Log:

```js
{
  username: "fcc_test",
  count: 1,
  _id: "5fb5853f734231456ccb3b05",
  log: [{
    description: "test",
    duration: 60,
    date: "Mon Jan 01 1990",
  }]
}
```

**Hint:** For the `date` property, the `toDateString` method of the `Date` API can be used to achieve the expected output.

# --hints--

You should provide your own project, not the example URL.

```js
(getUserInput) => {
  const url = getUserInput('url');
  assert(
    !/.*\/exercise-tracker\.freecodecamp\.rocks/.test(getUserInput('url'))
  );
};
```

You can `POST` to `/api/users` with form data `username` to create a new user.

```js
async (getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users', {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: `username=fcc_test_${Date.now()}`.substr(0, 29)
  });
  assert.isTrue(res.ok);
  if(!res.ok) {
    throw new Error(`${res.status} ${res.statusText}`)
  };
};
```

The returned response from `POST /api/users` with form data `username` will be an object with `username` and `_id` properties.

```js
async (getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users', {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: `username=fcc_test_${Date.now()}`.substr(0, 29)
  });
  if (res.ok) {
    const { _id, username } = await res.json();
    assert.exists(_id);
    assert.exists(username);
  } else {
    throw new Error(`${res.status} ${res.statusText}`);
  }
};
```

You can make a `GET` request to `/api/users` to get a list of all users.

```js
async(getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users');
  assert.isTrue(res.ok);
  if(!res.ok) {
    throw new Error(`${res.status} ${res.statusText}`)
  };
};
```

The `GET` request to `/api/users` returns an array.

```js
async(getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users');
  if(res.ok){
    const users = await res.json();
    assert.isArray(users);
  } else {
    throw new Error(`${res.status} ${res.statusText}`);
  };
};
```

Each element in the array returned from `GET /api/users` is an object literal containing a user's `username` and `_id`.

```js
async(getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users');
  if(res.ok){
    const users = await res.json();
    const user = users[0];
    assert.exists(user);
    assert.exists(user.username);
    assert.exists(user._id);
    assert.isString(user.username);
    assert.isString(user._id);
  } else {
    throw new Error(`${res.status} ${res.statusText}`);
  };
};
```

You can `POST` to `/api/users/:_id/exercises` with form data `description`, `duration`, and optionally `date`. If no date is supplied, the current date will be used. 

```js
async (getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users', {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: `username=fcc_test_${Date.now()}`.substr(0, 29)
  });
  if (res.ok) {
    const { _id, username } = await res.json();
    const expected = {
      username,
      description: 'test',
      duration: 60,
      _id,
      date: 'Mon Jan 01 1990'
    };
    const addRes = await fetch(url + `/api/users/${_id}/exercises`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: `description=${expected.description}&duration=${expected.duration}&date=1990-01-01`
    });
  assert.isTrue(addRes.ok);
  if(!addRes.ok) {
    throw new Error(`${addRes.status} ${addRes.statusText}`)
  };
  } else {
    throw new Error(`${res.status} ${res.statusText}`);
  }
};
```

The response returned from `POST /api/users/:_id/exercises` will be the user object with the exercise fields added.

```js
async (getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users', {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: `username=fcc_test_${Date.now()}`.substr(0, 29)
  });
  if (res.ok) {
    const { _id, username } = await res.json();
    const expected = {
      username,
      description: 'test',
      duration: 60,
      _id,
      date: 'Mon Jan 01 1990'
    };
    const addRes = await fetch(url + `/api/users/${_id}/exercises`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: `description=${expected.description}&duration=${expected.duration}&date=1990-01-01`
    });
    if (addRes.ok) {
      const actual = await addRes.json();
      assert.deepEqual(actual, expected);
      assert.isString(actual.description);
      assert.isNumber(actual.duration);
      assert.isString(actual.date);
    } else {
      throw new Error(`${addRes.status} ${addRes.statusText}`);
    }
  } else {
    throw new Error(`${res.status} ${res.statusText}`);
  }
};
```

You can make a `GET` request to `/api/users/:_id/logs` to retrieve a full exercise log of any user.

```js
async (getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users', {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: `username=fcc_test_${Date.now()}`.substr(0, 29)
  });
  if (res.ok) {
    const { _id, username } = await res.json();
    const expected = {
      username,
      description: 'test',
      duration: 60,
      _id,
      date: new Date().toDateString()
    };
    const addRes = await fetch(url + `/api/users/${_id}/exercises`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: `description=${expected.description}&duration=${expected.duration}`
    });
    if (addRes.ok) {
      const logRes = await fetch(url + `/api/users/${_id}/logs`);
    assert.isTrue(logRes.ok);
    if(!logRes.ok) {
      throw new Error(`${logRes.status} ${logRes.statusText}`)
    };
    } else {
      throw new Error(`${addRes.status} ${addRes.statusText}`);
    }
  } else {
    throw new Error(`${res.status} ${res.statusText}`);
  }
};
```

A request to a user's log `GET /api/users/:_id/logs` returns a user object with a `count` property representing the number of exercises that belong to that user.

```js
async (getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users', {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: `username=fcc_test_${Date.now()}`.substr(0, 29)
  });
  if (res.ok) {
    const { _id, username } = await res.json();
    const expected = {
      username,
      description: 'test',
      duration: 60,
      _id,
      date: new Date().toDateString()
    };
    const addRes = await fetch(url + `/api/users/${_id}/exercises`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: `description=${expected.description}&duration=${expected.duration}`
    });
    if (addRes.ok) {
      const logRes = await fetch(url + `/api/users/${_id}/logs`);
      if (logRes.ok) {
        const { count } = await logRes.json();
        assert(count);
      } else {
        throw new Error(`${logRes.status} ${logRes.statusText}`);
      }
    } else {
      throw new Error(`${addRes.status} ${addRes.statusText}`);
    }
  } else {
    throw new Error(`${res.status} ${res.statusText}`);
  }
};
```

A `GET` request to `/api/users/:id/logs` will return the user object with a `log` array of all the exercises added.

```js
async(getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded'
    },
    body: `username=fcc_test_${Date.now()}`.substr(0, 29)
  })
  if(res.ok){
    const {_id, username} = await res.json();
    const expected = {
      username,
      description: 'test',
      duration: 60,
      _id,
      date: new Date().toDateString()
    };
    const addRes = await fetch(url + `/api/users/${_id}/exercises`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: `description=${expected.description}&duration=${expected.duration}`
    });
    if(addRes.ok){
      const logRes = await fetch(url + `/api/users/${_id}/logs`);
      if(logRes.ok) {
        const {log} = await logRes.json();
        assert.isArray(log);
        assert.equal(1, log.length);
      } else {
        throw new Error(`${logRes.status} ${logRes.statusText}`);
      }
    } else {
      throw new Error(`${addRes.status} ${addRes.statusText}`);
    };
  } else {
    throw new Error(`${res.status} ${res.statusText}`)
  };
};
```

Each item in the `log` array that is returned from `GET /api/users/:id/logs` is an object that should have a `description`, `duration`, and `date` properties.

```js
async(getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + `/api/users`, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded'
    },
    body: `username=fcc_test_${Date.now()}`.substr(0, 29)
  });
  if(res.ok) {
    const {_id, username} = await res.json();
     const expected = {
      username,
      description: 'test',
      duration: 60,
      _id,
      date: new Date().toDateString()
    };
    const addRes = await fetch(url + `/api/users/${_id}/exercises`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: `description=${expected.description}&duration=${expected.duration}`
    });
    if(addRes.ok) {
      const logRes = await fetch(url + `/api/users/${_id}/logs`);
      if(logRes.ok) {
        const {log} = await logRes.json();
        const exercise = log[0];
        assert.exists(exercise);
        assert.exists(exercise.description);
        assert.exists(exercise.duration);
        assert.exists(exercise.date);
      } else {
        throw new Error(`${logRes.status} ${logRes.statusText}`);
      };
    } else {
      throw new Error(`${addRes.status} ${addRes.statusText}`);
    };
  } else {
    throw new Error(`${res.status} ${res.statusText}`)
  };
};
```

The `description` property of any object in the `log` array that is returned from `GET /api/users/:id/logs` should be a string.

```js
async(getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users/', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded',
    },
    body: `username=fcc_test_${Date.now()}`.substr(0,29)
  });
  if(res.ok) {
    const {_id, username} = await res.json();
    const expected = {
      username,
      description: 'test',
      duration: 60,
      _id,
      date: new Date().toDateString()
    };
    const addRes = await fetch(url + `/api/users/${_id}/exercises`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
      },
      body: `description=${expected.description}&duration=${expected.duration}`
    });
    if(addRes.ok) {
      const logRes = await fetch(url + `/api/users/${_id}/logs`);
      if(logRes.ok){
        const {log} = await logRes.json();
        const exercise = log[0];
        assert.isString(exercise.description);
        assert.equal(exercise.description, expected.description);
      } else {
        throw new Error(`${logRes.status} ${logRes.statusText}`);
      }
    } else {
      throw new Error(`${addRes.status} ${addRes.statusText}`);
    };
  } else {
    throw new Error(`${res.status} ${res.statusText}`);
  };
};
```

The `duration` property of any object in the `log` array that is returned from `GET /api/users/:id/logs` should be a number.

```js
async(getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users/', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded',
    },
    body: `username=fcc_test_${Date.now()}`.substr(0,29)
  });
  if(res.ok) {
    const {_id, username} = await res.json();
    const expected = {
      username,
      description: 'test',
      duration: 60,
      _id,
      date: new Date().toDateString()
    };
    const addRes = await fetch(url + `/api/users/${_id}/exercises`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
      },
      body: `description=${expected.description}&duration=${expected.duration}`
    });
    if(addRes.ok) {
      const logRes = await fetch(url + `/api/users/${_id}/logs`);
      if(logRes.ok){
        const {log} = await logRes.json();
        const exercise = log[0];
        assert.isNumber(exercise.duration);
        assert.equal(exercise.duration, expected.duration);
      } else {
        throw new Error(`${logRes.status} ${logRes.statusText}`);
      }
    } else {
      throw new Error(`${addRes.status} ${addRes.statusText}`);
    };
  } else {
    throw new Error(`${res.status} ${res.statusText}`);
  };
};
```

The `date` property of any object in the `log` array that is returned from `GET /api/users/:id/logs` should be a string.. Use the `dateString` format of the `Date` API.

```js
async(getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users/', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded',
    },
    body: `username=fcc_test_${Date.now()}`.substr(0,29)
  });
  if(res.ok) {
    const {_id, username} = await res.json();
    const expected = {
      username,
      description: 'test',
      duration: 60,
      _id,
      date: new Date().toDateString()
    };
    const addRes = await fetch(url + `/api/users/${_id}/exercises`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
      },
      body: `description=${expected.description}&duration=${expected.duration}`
    });
    if(addRes.ok) {
      const logRes = await fetch(url + `/api/users/${_id}/logs`);
      if(logRes.ok){
        const {log} = await logRes.json();
        const exercise = log[0];
        assert.isString(exercise.date);
        assert.equal(exercise.date, expected.date);
      } else {
        throw new Error(`${logRes.status} ${logRes.statusText}`);
      }
    } else {
      throw new Error(`${addRes.status} ${addRes.statusText}`);
    };
  } else {
    throw new Error(`${res.status} ${res.statusText}`);
  };
};
```

You can add `from`, `to` and `limit` parameters to a `GET /api/users/:_id/logs` request to retrieve part of the log of any user. `from` and `to` are dates in `yyyy-mm-dd` format. `limit` is an integer of how many logs to send back.

```js
async (getUserInput) => {
  const url = getUserInput('url');
  const res = await fetch(url + '/api/users', {
    method: 'POST',
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
    body: `username=fcc_test_${Date.now()}`.substr(0, 29)
  });
  if (res.ok) {
    const { _id, username } = await res.json();
    const expected = {
      username,
      description: 'test',
      duration: 60,
      _id,
      date: new Date().toDateString()
    };
    const addExerciseRes = await fetch(url + `/api/users/${_id}/exercises`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: `description=${expected.description}&duration=${expected.duration}&date=1990-01-01`
    });
    const addExerciseTwoRes = await fetch(url + `/api/users/${_id}/exercises`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
      body: `description=${expected.description}&duration=${expected.duration}&date=1990-01-03`
    });
    if (addExerciseRes.ok && addExerciseTwoRes.ok) {
      const logRes = await fetch(
        url + `/api/users/${_id}/logs?from=1989-12-31&to=1990-01-04`
      );
      if (logRes.ok) {
        const { log } = await logRes.json();
        assert.isArray(log);
        assert.equal(2, log.length);
      } else {
        throw new Error(`${logRes.status} ${logRes.statusText}`);
      }
      const limitRes = await fetch(
        url + `/api/users/${_id}/logs?limit=1`
      );
      if (limitRes.ok) {
        const { log } = await limitRes.json();
        assert.isArray(log);
        assert.equal(1, log.length);
      } else {
        throw new Error(`${limitRes.status} ${limitRes.statusText}`);
      }
      const filterDateBeforeLimitRes = await fetch(
        url + `/api/users/${_id}/logs?from=1990-01-02&to=1990-01-04&limit=1`
      );
      if (filterDateBeforeLimitRes.ok) {
        const { log } = await filterDateBeforeLimitRes.json();
        assert.isArray(log);
        assert.equal(1, log.length);
      } else {
        throw new Error(`${filterDateBeforeLimitRes.status} ${filterDateBeforeLimitRes.statusText}`);
      }
    } else {
      throw new Error(`${res.status} ${res.statusText}`);
    }
  } else {
    throw new Error(`${res.status} ${res.statusText}`);
  }
};
```

# --solutions--

```js
/**
  Backend challenges don't need solutions,
  because they would need to be tested against a full working project.
  Please check our contributing guidelines to learn more.
*/
```