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      "body": "Congratulations @xenetics! You received a personal award!\n\n<table><tr><td>https://steemitimages.com/70x70/http://steemitboard.com/@xenetics/birthday1.png</td><td>1 Year on Steemit</td></tr></table>\n\n<sub>_[Click here to view your Board](https://steemitboard.com/@xenetics)_</sub>\n\n\n**Do not miss the last post from @steemitboard:**\n<table><tr><td><a href=\"https://steemit.com/steem/@steemitboard/steemwhales-has-officially-moved-to-steemitboard-ranking\"><img src=\"https://steemitimages.com/64x128/https://cdn.steemitimages.com/DQmfRVpHQhLDhnjDtqck8GPv9NPvNKPfMsDaAFDE1D9Er2Z/header_ranking.png\"></a></td><td><a href=\"https://steemit.com/steem/@steemitboard/steemwhales-has-officially-moved-to-steemitboard-ranking\">SteemWhales has officially moved to SteemitBoard Ranking</a></td></tr><tr><td><a href=\"https://steemit.com/steemitboard/@steemitboard/steemitboard-witness-update-2019-01-07\"><img src=\"https://steemitimages.com/64x128/http://i.cubeupload.com/7CiQEO.png\"></a></td><td><a href=\"https://steemit.com/steemitboard/@steemitboard/steemitboard-witness-update-2019-01-07\">SteemitBoard - Witness Update</a></td></tr></table>\n\n> Support [SteemitBoard's project](https://steemit.com/@steemitboard)! **[Vote for its witness](https://v2.steemconnect.com/sign/account-witness-vote?witness=steemitboard&approve=1)** and **get one more award**!",
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      "body": "This is an analysis and some predictions for various \"first\" markets (blood/dragon/turret/baron) for the upcoming NA LCS semifinals on the 1st and 2nd of September, 2018, with betting recommendations following the analysis.\n\n## Cloud9 vs TSM\n\nCloud9 vs TSM looks to be an exciting game. Let's take a look at some data, and what markets might be promising. First, the team's overall performance:\n\n![](https://github.com/lmiller1990/gamblor/blob/master/articles/graphs/c9_tsm_semis.png?raw=true)\n\nTSM have an extra 6 games on C9 - a tiebreaker to progress to the playoffs, and their five game quarterfinal match against Echo Fox. At the end of the regular season, C9 had one game up on TSM. C9 has won their last 8 games straight.\n\nC9 and TSM's win rates over the entire split are 56% and 61% respectively - a weighted average of 53% to 47%, too close to call. However, for the last eight games, the numbers tell a different story: 68% to 31%. Cloud9 is hot stuff. The odds are 1.44 : 2.62 in favor of C9, which reflects this. Both are around 0.8 to 0.9 EV, so I wouldn't put money on either.\n\nHow about first bloods?\n\n![](https://github.com/lmiller1990/gamblor/blob/master/articles/graphs/c9_tsm_fb.png?raw=true)\n\nBoth have achieved a high % of first bloods in recent games. They also follow similar trends through the season. The odds here are 1.72 : 2, for C9 : TSM. Sampling the entire split (displayed as -1 games), last 8 and 4 games gives us:\n\n```\n=== cloud9 vs team solomid - first_blood last -1 games ===\nRelative %\t 53.78 : 46.22\ncloud9 : team solomid 1.72 : 2\ncloud9 \tev: 0.92\nteam solomid \tev: 0.92\n\n=== cloud9 vs team solomid - first_blood last 8 games ===\nRelative %\t 68.75 : 31.25\ncloud9 : team solomid 1.72 : 2\ncloud9 \tev: 1.18 \t<------------------- High EV\nteam solomid \tev: 0.62\n\n=== cloud9 vs team solomid - first_blood last 4 games ===\nRelative %\t 62.5 : 37.5\ncloud9 : team solomid 1.72 : 2\ncloud9 \tev: 1.08\nteam solomid \tev: 0.75\n```\n\nC9 might be a candidate for an FB bet - the latter part of the split, combined with the odds, gives solid EV.\n\nFirst dragon isn't anything right home about, even both ways throughout the season. First turret is a bit more interesting:\n\n![](https://github.com/lmiller1990/gamblor/blob/master/articles/graphs/c9_tsm_ft.png?raw=true)\n\nC9 have maintained their first turret percentage at well over 50% throughout the entire season! TSM, on the other hand, has been hanging around the low 40s. FT is more often than not in the bot lane, since ADCs are basically chosen for their turret taking abilities, plus they have a second player helping them. This reflects both C9's stellar bottom lane, especially Sneaky, the definition of consistency, as well as TSM's underperforming European duo.\n\n```\n=== cloud9 vs team solomid - first_turret last -1 games ===\nRelative %\t 65.33 : 34.67\ncloud9 : team solomid 1.72 : 2.0\ncloud9 \tev: 1.12 \t<------------------- High EV\nteam solomid \tev: 0.69\n\n=== cloud9 vs team solomid - first_turret last 8 games ===\nRelative %\t 75.0 : 25.0\ncloud9 : team solomid 1.72 : 2.0\ncloud9 \tev: 1.29 \t<------------------- High EV\nteam solomid \tev: 0.5\n\n=== cloud9 vs team solomid - first_turret last 4 games ===\nRelative %\t 75.0 : 25.0\ncloud9 : team solomid 1.72 : 2.0\ncloud9 \tev: 1.29 \t<------------------- High EV\nteam solomid \tev: 0.5\n```\n\nA snapshot of the odds, and calculated EV at any point during the split show C9 as a strong case for a FT bet. Let's look at first baron next.\n\nTSM has a ever so slightly positive EV over the latter half of the split regarding first baron, but given the strong correlation between first baron and winning the game, which TSM is not favored to do, I'm not sure it's a good bet. FB and FT have a very minimal correlation to the actual result of the game (~0.1), so I'm happy to bet on either regardless of what I expect to be the final result. \n\nSince first baron has a high correlation with victory in NA (around 0.65 for the top teams), I would like to weigh first baron more heavily in the future. Things I would like to include in the weighting are the matchup and recent game history.\n\n## Team Liquid vs 100 Thieves\n\nWhat looks like two of the top teams this split meet in the semifinals. Their overall wins put them at a 49% : 51% weighted average win percentage, for 100 and TL respectively. That changes to 43% : 57% considering the last 8 games, still a close contest, but factors in the recent win stream for TL.\n\nLooking at the running victories for both teams:\n\n![](https://github.com/lmiller1990/gamblor/blob/master/articles/graphs/100_tl_victories.png?raw=true)\n\nTL is on fire, with 5 straight wins. 100 had a similar streak earlier, although I haven't checked which team it was against.\n\nLet's take a look at first blood:\n\n![](https://github.com/lmiller1990/gamblor/blob/master/articles/graphs/100_tl_fb.png?raw=true)\n\n100 fell of pretty heavily in their last few games, but other than that, maintained a healthy 60-70% throughout the split. TL, on the other hand, hovered around 50%, and shot up recently. With the odds at 1.72 : 2 for LT and 100 respectively, 100 maintains a positive EV at all points of the split.\n\n```\n=== team liquid vs 100 thieves - first_blood last -1 games ===\nRelative %\t 47.34 : 52.66\nteam liquid : 100 thieves 1.72 : 2\nteam liquid \tev: 0.81\n100 thieves \tev: 1.05\n\n=== team liquid vs 100 thieves - first_blood last 8 games ===\nRelative %\t 31.25 : 68.75\nteam liquid : 100 thieves 1.72 : 2\nteam liquid \tev: 0.54\n100 thieves \tev: 1.38 \t<------------------- High EV\n\n=== team liquid vs 100 thieves - first_blood last 4 games ===\nRelative %\t 37.5 : 62.5\nteam liquid : 100 thieves 1.72 : 2\nteam liquid \tev: 0.64\n100 thieves \tev: 1.25 \t<------------------- High EV\n```\n\nTheir recent downtrend, along with TL's recent uptrend makes me a little less confident, but since FB is impacted by a long of factors, like champion selection, I'd say 100 is still a solid choice. My personal win rate with FB is around 45%, so as long as the EV is sufficiently positive, it's a long term winner.\n\nFirst turret tells a very different story:\n\n![](https://github.com/lmiller1990/gamblor/blob/master/articles/graphs/100_tl_ft.png?raw=true)\n\nUntil 3/4 of the way through the split, the teams were fairly close. TL, however, has pulled away to become to FT kings, and again we observe a downward trend for 100. The lack of consistency is shown in the EV:\n\n```\n=== team liquid vs 100 thieves - first_turret last -1 games ===\nRelative %\t 48.31 : 51.69\nteam liquid : 100 thieves 1.66 : 2.1\nteam liquid \tev: 0.8\n100 thieves \tev: 1.09\n\n=== team liquid vs 100 thieves - first_turret last 8 games ===\nRelative %\t 50.0 : 50.0\nteam liquid : 100 thieves 1.66 : 2.1\nteam liquid \tev: 0.83\n100 thieves \tev: 1.05\n\n=== team liquid vs 100 thieves - first_turret last 4 games ===\nRelative %\t 50.0 : 50.0\nteam liquid : 100 thieves 1.66 : 2.1\nteam liquid \tev: 0.83\n100 thieves \tev: 1.05\n```\n\nPositive EV on 10. I prefer to bet on a minimum EV of 1.1, so this is really on the fence for me. I'll think about it a little more.\n\nHow about first dragon?\n\n![](https://github.com/lmiller1990/gamblor/blob/master/articles/graphs/100_tl_fd.png?raw=true)\n\nTL are the first dragon KINGS. Mainly because of Xmithie, arguably the best jungler in the league, sitting at a cool 70% for most of the split. 100 have a very low percentage - their botlane is solid, especially mid and late game, but they certainly don't play for the first 10 minutes. TL, on the other hand, basically have Doublelift carry every game. This dominant bottom lane, in combination with Xmithie's dominance in the jungle, leads to a ludicrously high FD percentage.\n\nThe EV also reflects this:\n\n```\n=== team liquid vs 100 thieves - first_dragon last -1 games ===\nRelative %\t 64.37 : 35.63\nteam liquid : 100 thieves 1.72 : 2.0\nteam liquid \tev: 1.11 \t<------------------- High EV\n100 thieves \tev: 0.71\n\n=== team liquid vs 100 thieves - first_dragon last 8 games ===\nRelative %\t 75.0 : 25.0\nteam liquid : 100 thieves 1.72 : 2.0\nteam liquid \tev: 1.29 \t<------------------- High EV\n100 thieves \tev: 0.5\n\n=== team liquid vs 100 thieves - first_dragon last 4 games ===\nRelative %\t 87.5 : 12.5\nteam liquid : 100 thieves 1.72 : 2.0\nteam liquid \tev: 1.5 \t<------------------- High EV\n100 thieves \tev: 0.25\n```\n\nLooks like a good bet.\n\nFirst baron is interesting. 100's ongoing downtrend is revealed here, too:\n\n![](https://github.com/lmiller1990/gamblor/blob/master/articles/graphs/100_tl_fbaron.png?raw=true)\n\nUntil recently, it's about 50% for each team. How about some EVs?\n\n```\n=== team liquid vs 100 thieves - first_baron last -1 games ===\nRelative %\t 48.91 : 51.09\nteam liquid : 100 thieves 1.61 : 2.2\nteam liquid \tev: 0.79\n100 thieves \tev: 1.12 \t<------------------- High EV\n\n=== team liquid vs 100 thieves - first_baron last 8 games ===\nRelative %\t 62.5 : 37.5\nteam liquid : 100 thieves 1.61 : 2.2\nteam liquid \tev: 1.01\n100 thieves \tev: 0.82\n\n=== team liquid vs 100 thieves - first_baron last 4 games ===\nRelative %\t 50.0 : 50.0\nteam liquid : 100 thieves 1.61 : 2.2\nteam liquid \tev: 0.8\n100 thieves \tev: 1.1\n```\n\nPretty inconsistent, no clear winner here.\n\n## Conclusion\n\nCloud9 has a strong history of taking first turret all split, compared to TSM and their struggling bottom lane. FT is a good bet for C9 this weekend. 100 Thieves also look to be a solid choice for first blood against TL. TL's strong bottom lane and excellent jungle presence puts them as the main contender for first dragon. C9 and TL as the favourites for the respective games, with the postive EV are particularly good picks.\n\n- C9 for FT\n- 100 for FB\n- TL for FD",
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      "body": "![](https://steemitimages.com/0x0/https://cdn-images-1.medium.com/max/800/1*IM14RDpJNKz2hW69iTQLCQ.jpeg)\nImage: Fintech News.\n\nThis part of the series focused on authentication. In the previous article, I demonstrated how to post to the Steem blockchain by hardcoding your credentials. This time, we will create a login feature, so a user only needs to enter their initials once. This will be the first article to introduce a server, using Express for Node.js, and JWT (JSON Web Token) for authentication.\n\nPart 1, Storybook, Vue and Steem.js is [here](https://medium.com/@lachlanmiller_52885/build-social-media-platform-with-the-steem-blockchain-1-vue-js-storybook-js-and-steem-js-a25bd7629a14) and Part 2, posting a comment to the blockchain is [here](https://steemit.com/utopian-io/@xenetics/build-social-media-platform-with-the-steem-blockchain-2-posting-a-comment-to-the-blockchain). The source code for this part is [here](https://github.com/lmiller1990/steem-blog-series/tree/part-3-login).\n\n## Install the Server Dependencies\n\nFirst, install `express`, the server framework we will be using, along with `jsonwebtoken` and `body-parser` by running `yarn add express jsonwebtoken body-parser --save`. Next, create a `server` directory inside `src`, and inside of `server` a `index.js`. This is where the server will run from. I also recommend installing `nodemon`, which automatically restarts the server after each change - otherwise you would have to manually kill and restart it. You can install `nodemon` globally by running `yarn global add nodemon`.\n\n## Setting up the Express Backend\n\nBefore doing any work on the front end, let's set up JWT authentication. This is not an Node.js/Express tutorial, but it's fairly easy either way. If you need to, check some basic guides about Express first. I will, however, explain JWT authentication as we go.\n\nI will be using `curl`, a command line tool that is available on Mac OS and Unix systems, but not Windows by default. You can install it for Windows, the site is [here](https://curl.haxx.se/download.html) and the several guides are [here](https://stackoverflow.com/questions/9507353/how-do-i-install-set-up-and-use-curl-on-windows).\n\nIn `src/server/index.js`, add the following minimal Express application:\n\n```js\nconst express = require('express')\nconst bodyParser = require('body-parser')\nconst jwt = require('jsonwebtoken')\n\nconst app = express()\napp.use(bodyParser.json())\n\napp.post('/api/login', (req, res) => {\n  res.sendStatus(403)\n})\n\napp.listen(5000, () => console.log('Listening on port 5000.'))\n```\n\nWe create a single `/api/login` endpoint, which current returns 403 (forbidden status code) no matter what. Let's test it out, to make sure it's working. Run `nodemon src/server/index.js` in one terminal, and in another use the follow curl command:\n\n```sh\ncurl http://localhost:5000/api/login \\\n  -X POST \n```\n\nIf everything went well, curl should have returned `Forbidden`. If not, check everything is typed correctly.\n\n## Validating the User on the Server\n\nLet's talk about JWT for a second. Basically, the client will attempt to log in using some credentials, in our case a Steem username and password. Once we authenticate the user, using Steem.js, the server will generated a \"JSON Web Token\" using `jsonwebtoken`, which we installed earlier. We then send the token back to the client. On all subsequent requests, the client will include the token. If the token is successfully validated by the `jsonwebtoken`, the request is allowed. Our workflow wiil be something like this:\n\n1. Client sends username/password to the server's `api/login` endpoint.\n2. The server validates the login using `Steem.js`. \n3. If the credentials are correct, create a token and send it back, with any extra information.\n4. Now the client is \"logged in\". The client should resend the token each request to prove is it the authenticated user, and not a hacker/someone impersonating the real user's identity.\n\nLet's update the `login` endpoint to achieve the second step above. There is a lot of new code - the explanation follows.\n\n```js\napp.post('/api/login', async (req, res) => {\n  const { username, password } = req.body \n\n  // get posting public key\n  const account = await steem.api.getAccountsAsync([ username ])\n  const pubKey = account[0].posting.key_auths[0][0]\n\n  // \n  // for a given username/password combo,\n  // response contains { posting: 'private key', postingPubkey: 'pub key' }\n  // \n  const { posting } = steem.auth.getPrivateKeys(username, password, ['posting'])\n  //\n  // See if the private key is a match to the public key\n  const isValid = steem.auth.wifIsValid(posting, pubKey)\n   \n  if (isValid) {\n    res.json({ username })\n  } else {\n    res.sendStatus(403)\n  }\n})\n```\n\nThere is a lot going on here. First, we extract the `username` and `password` from the request body. Next we use the `getAccounts` method (documentation [here](https://github.com/steemit/steem-js/tree/master/doc#get-accounts), which returns a bunch of public information about the account. We are interested in the posting public key. You can see the previous article for more details on what other fields are in this response.\n\nNext, we get the private keys based on the `username` and `password` combination. Note that even if the username or password is wrong, the `getPrivateKeys` method still returns as public/private key combination - the will just be incorrect. Now we validate the two keys using `wifIsValid` (documentation [here](https://github.com/steemit/steem-js/tree/master/doc#wif-is-valid)). If the keys are a match, we return the original `username` - otherwise, the original `403 forbidden`. Note we still have not touched on the JSON Web Token - that will come next, once we make sure this is working.\n\nTest it out using curl like this:\n\n```sh\ncurl http://localhost:5000/api/login \\\n  -X POST \\\n  -d '{ \"username\": \"your username\", \"password\": \"your password\" }' \\\n  -H \"Content-Type: application/json\" \\\n```\n\nTry your real password - you should get your username in the response. Next, change your password, and you should get the `403 forbidden` status.\n\n## Implementing JWT\n\nNow we can verify a user, the next step is to generate the JWT. Generating the token is extremely simple. Inside of `if (isValid)`, add the following:\n\n```js\nif (isValid) {\n  // \n  // Sign the JWT\n  //\n  jwt.sign({ username }, 'ca214cc74cc32fafdca98b12e27663e8', (err, token) => {\n    if (err) throw err\n\n    res.json({ token })\n  })\n \n} else {\n  res.sendStatus(403)\n}\n```\n\nThe documentation for `jwt.sign` is [here](https://github.com/auth0/node-jsonwebtoken#jwtsignpayload-secretorprivatekey-options-callback). The first argument can be any payload - it is common to use a username or id. The second argument is a _secret key_ - this is something unique to your application, that you should not share. For this tutorial, I generated a random 16 digit hex number. You should never check this into source control or share it with anyone, or your server's security can be compromised.\n\nFinally, the `token` is returned to the user. All subsequent requests (such as posting) will require this token to be sent from the client. Once the client has this token, however, they will not need to log in again until the token expires. You can set the expiry date in the third argument, an `options` object. This is in the documentation linked above.\n\nTry running the `curl` command again now. If you supply a correct username/password combination, you should get a response like this:\n\n```\n{\"token\":\"32JidGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.ey4142VybmFtZSI6InhlbmV0aWNzMTIzIiwiaWF0IjoxNTM1Mzc2MzI0fQ.4jp2LLAeDNUeUBHFFAs6vWhg1B6ftsI6ut7QRF3wdc4\"}\n```\n\nThis token is used for authentication. To see it in action, create another endpoint, `/api/posts`:\n\n```js\napp.post('/api/posts', verifyToken, (req, res) => {\n  jwt.verify(req.token, 'ca214cc74cc32fafdca98b12e27663e8', (err, auth) => {\n    if (err) res.sendStatus(403, { err })\n\n    res.json({ auth })\n  })\n})\n```\n\nThe match method for `json.sign` is `jwt.verify`. Using the token created earlier, and the secret key, it can determine if the token was originally received when the user successfully authenticated, or if it is a malicious party trying to compromise the application. \n\nYou may have noticed we refer to `req.token` - this will be sent by the client. Also, we add a `verifyToken` middleware. Basically, before executing the `jwt.verify` logic, we will call `verifyToken`. This method will check if the client correctly included the JWT. It looks like this:\n\n```js\nfunction verifyToken(req, res, next) {\n  // \n  // Get auth header value\n  //\n  const bearerHeader = req.headers['authorization']\n\n  //\n  // check if bearer not defined\n  // Payload looks like this:\n  // Authorization: bearer xxxxxxxxxxxx\n  //\n  if (typeof bearerHeader !== 'undefined') {\n    const bearer = bearerHeader.split(' ')\n    req.token = bearer[1]\n    next()\n  } else {\n    res.sendStatus(403)\n  }\n}\n```\n\nThe JWT has to be included in a specific format. The format is `Authorization: bearer [token]`. To get the token from the request, we first access the `bearer [token]` part using `req.headers['authorization']`. If it exists, we get the token part using `split`, and add it to the `request`. The `request` will then be passed on to the `app.post('/api/posts')` method. If the token is not present, we just return `403 Forbidden`.\n\nTo see if it works, run a new `curl` request that looks like this:\n\n```sh\ncurl http://localhost:5000/api/posts \\\n  -X POST \\\n  -H \"Content-Type: application/json\" \\\n  -H \"Authorization: Bearer [your key does here]\"\n```\n\nWe are posting to the `/api/posts` endpoint, with the correct token. If you did everything correctly, the response should look something like `{\"auth\":{\"username\":\"xenetics123\",\"iat\":1535377462}}`. Notice we did NOT include our username or password, just the token - which requires the username and password to be created in the first place. This is just for a test - in the next part of the series, we will implement the logic to post to the Steem blockchain at `/api/posts`, and return a status to reflect the post was successful.\n\n## Writing Tests for the Server Code\n\nNow JWT authentication is working, let's finish up with some unit tests. First, a small tweak to `src/server/index.js` is needed to let us run the server on a different port to the main application, and easily restart it between tests. Update the part of `src/server/index.js` where the server is created:\n\n```\nfunction boot(port) {\n  return app.listen(port, () => console.log(`Listening on port ${port}.`))\n}\n\nif (!module.parent) {\n  boot(5000)\n}\n\nmodule.exports = { boot }\n```\n\nThis way, the server will only run if there is no `module.parent` - basically, when it is not being required in another file.\n\nCreate a directory called `server` in `tests/unit/specs/server` and add a `index.spec.js` file. Before writing the actual tests, we have some housekeeping to do.\n\n## Mocking steem.js\n\nTesting is not the main purpose of this series, so I will not provide an in depth explanation of how exactly the tests are working. Trying things out yourself is the best way to learn. Either way, tests are part of any development workflow, so I'm going to go over them quickly anyway.\n\nWe _know_ steem.js and the functions it provides are working correctly - it has its own set of unit tests, written by the developers of the library. We want to test the our own code. That means we _mock_ the steem.js api - `getPrivateKeys`, `wifIsValid` and so forth. Jest allows us to mock a node module like so:\n\n```js\nconst http = require('http')\nconst { boot } = require('../../../../src/server/index.js')\n\nlet mockWifIsValid = false\n\njest.mock('steem', function() {\n  return {\n    auth: {\n      getPrivateKeys: () => ({ posting: 'mock' }),\n      wifIsValid: () => mockWifIsValid\n    },\n\n    api: {\n      getAccountsAsync: () => [{\n        posting: { key_auths: [[ 'mock' ]] }\n      }],\n      setOptions: jest.fn()\n    }\n  }\n})\n```\n\nWe declared a global `mockWifIsValid` variable. This lets us simulate a correct or incorrect username/password combination by saying `mockWifIsValid = true` or `mockWifIsValid = false`. Now the actual tests - first one for the case of incorrect credentials:\n\n```js\ndescribe('server', () => {\n  let server\n\n  beforeEach(() => server = boot(4000))\n  afterEach(() => server.close())\n\n  describe('POST /api/login', () => {\n    it('returns a 403 if username/password is invalid', (done) => {\n      mockWifIsValid = false\n\n      const options = {\n        hostname: 'localhost',\n        port: 4000,\n        path: '/api/login',\n        method: 'POST'\n      }\n      const req = http.request(options, (res) => {\n        res.setEncoding('utf8')\n        res.on('data', () => {\n          expect(res.statusCode).toBe(403)\n          done()\n        })\n      })\n\n      req.end()\n    })\n  })\n})\n```\n\nKind of long, but it's worth it to be confident the application is working correctly as we develop. `beforeEach` test, we start the server, and `afterEach` we close it. Then to simulate incorrect credentials, `mockWifIsValid` is set to `false`. After making the request using Node's `http` module, we `expect(res.statusCode).toBe(403)`.\n\nNext, the passing case:\n\n```js\nit('returns a JWT if the username/password is valid', (done) => {\n  mockWifIsValid = true\n\n  const options = {\n    hostname: 'localhost',\n    port: 4000,\n    path: '/api/login',\n    method: 'POST',\n    headers: { 'content-type': 'application/json' }\n  }\n  const req = http.request(options, (res) => {\n    res.setEncoding('utf8')\n    res.on('data', (chunk) => {\n      expect(JSON.parse(chunk)).toHaveProperty('token')\n      done()\n    })\n  })\n\n  req.write('{ \"username\": \"test user\" }')\n  req.end()\n})\n```\n\nWe don't need to verify what the `token` is. As long as the `token` property is present in the response, I'm confident that the `jsonwebtoken` module is working correctly.\n\nThis test can be run individually using `yarn jest --runTestsByPath test/unit/spec/server/index.test.js`. If you did everything correctly, they should pass. Run the entire suite using `yarn unit`.\n\n## Conclusion\n\nThis was a pretty long article with a long of information. It covered:\n\n- what JWT is and how it works\n- setting up Express and working with Node.js\n- how to use `getAccountsAsync` to get account details\n- using `getPrivateKeys` to get keys using a username/password \n- verifying the validity of the keys using `wifIsValid`\n- writing tests using Jest and `jest.mock`\n\nThe next part will focus on integrating the Vue frontend from the previous article, and the server we created here, to allow a user to log in, then post without retyping their password by using JWT authentication.\n\nThe source code for this part is [here](https://steemit.com/utopian-io/@xenetics/build-social-media-platform-with-the-steem-blockchain-2-posting-a-comment-to-the-blockchain).",
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