1-package.json

{
  "name": "usda-ingredients-api",
  "version": "1.0.0",
  "description": "a REST API for pulling ingredients given a UPC code from ndb.nal.usda.gov",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "repository": {
    "type": "git",
    "url": "git+https://github.com/joshterrill/usda-ingredients-api.git"
  },
  "keywords": [
    "USDA",
    "ingredient",
    "UPC",
    "ingredients",
    "API"
  ],
  "author": "Josh Terrill",
  "license": "MIT",
  "bugs": {
    "url": "https://github.com/joshterrill/usda-ingredients-api/issues"
  },
  "homepage": "https://github.com/joshterrill/usda-ingredients-api#readme"
}

2-index.js

const express = require('express');

const app = express();
const port = 3000;

app.get('/', (req, res) => {
  res.send('Hello, world.');
});

app.listen(port, () => {
  console.log(`Server listening on port ${port}`);  
});

3-index.js

const express = require('express');
const bodyParser = require('body-parser');

const app = express();
const port = process.env.PORT || 3000;

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));

app.get('/', (req, res) => {
  res.json({hello: 'world'});
});

app.post('/search', (req, res) => {
  const body = req.body;
  res.json({body});
});

app.listen(port, () => {
  console.log(`Server listening on port ${port}`);  
});

4-index.js

const express = require('express');
const bodyParser = require('body-parser');
const request = require('request');

const app = express();
const port = process.env.PORT || 3000;

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));

app.get('/', (req, res) => {
  res.json({hello: 'world'});
});

app.post('/search', (req, res) => {
  const body = req.body;
  if (body.text) {
    request.get(`https://ndb.nal.usda.gov/ndb/search/list?qlookup=${body.text}`, (searchError, searchResponse, searchBody) => {
      if (searchError) res.json({error: searchError, success: false, data: null});
      res.json({searchBody});
    });
  } else if (body.upc) {
    // todo UPC code
  } else {
    res.json({error: 'Please provide a "text" or "upc" key in your request object.', success: false, data: null});
  }
});

app.listen(port, () => {
  console.log(`Server listening on port ${port}`);  
});

5-index.js

const express = require('express');
const bodyParser = require('body-parser');
const request = require('request');
const cheerio = require('cheerio');

const app = express();
const port = process.env.PORT || 3000;

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));

app.get('/', (req, res) => {
  res.json({hello: 'world'});
});

app.post('/search', (req, res) => {
  const body = req.body;
  if (body.text) {
    request.get(`https://ndb.nal.usda.gov/ndb/search/list?qlookup=${body.text}`, (searchError, searchResponse, searchBody) => {
      if (searchError) res.json({error: searchError, success: false, data: null});
      let $ = cheerio.load(searchBody.replace(/[\n\r\t]+/g, ''));
      res.json({text: $('.result-message').text()});
    });
  } else if (body.upc) {
    // todo UPC code
  } else {
    res.json({error: 'Please provide a "text" or "upc" key in your request object.', success: false, data: null});
  }
});

app.listen(port, () => {
  console.log(`Server listening on port ${port}`);  
});

6-selector-test.js

let $ = cheerio.load(searchBody.replace(/[\n\r\t]+/g, ''));
let searchResults = $($('.list-left table tbody tr')[0]).html();
res.json({text: searchResults});

7-index.js

const express = require('express');
const bodyParser = require('body-parser');
const request = require('request');
let cheerio = require('cheerio');
const cheerioAdv = require('cheerio-advanced-selectors');

cheerio = cheerioAdv.wrap(cheerio);

const app = express();
const port = process.env.PORT || 3000;

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));

app.get('/', (req, res) => {
  res.json({hello: 'world'});
});

app.post('/search', (req, res) => {
  const body = req.body;
  if (body.text) {
    request.get(`https://ndb.nal.usda.gov/ndb/search/list?qlookup=${body.text}`, (searchError, searchResponse, searchBody) => {
      if (searchError) res.json({error: searchError, success: false, data: null});
      let $ = cheerio.load(searchBody.replace(/[\n\r\t]+/g, ''));
      let searchProductLink = $($($($('.list-left table tbody tr')[0]).html()).children()[1]).attr('href');
      res.json({link: searchProductLink});
    });
  } else if (body.upc) {
    // todo UPC code
  } else {
    res.json({error: 'Please provide a "text" or "upc" key in your request object.', success: false, data: null});
  }
});

app.listen(port, () => {
  console.log(`Server listening on port ${port}`);  
});

8-index.js

const express = require('express');
const bodyParser = require('body-parser');
const request = require('request');
let cheerio = require('cheerio');
const cheerioAdv = require('cheerio-advanced-selectors');

cheerio = cheerioAdv.wrap(cheerio);

const app = express();
const port = process.env.PORT || 3000;

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({extended: false}));

app.get('/', (req, res) => {
  res.json({hello: 'world'});
});

app.post('/search', (req, res) => {
  const body = req.body;
  if (body.text) {
    request.get(`https://ndb.nal.usda.gov/ndb/search/list?qlookup=${body.text}`, (searchError, searchResponse, searchBody) => {
      if (searchError) res.json({error: searchError, success: false, data: null});
      let $ = cheerio.load(searchBody.replace(/[\n\r\t]+/g, ''));
      const searchProductLink = $($($($('.list-left table tbody tr')[0]).html()).children()[1]).attr('href');
      let detailLink = 'https://ndb.nal.usda.gov' + searchProductLink;
      request.get(detailLink, (detailError, detailResponse, detailBody) => {
        if (detailError) res.json({error: detailError, success: false, data: null});        
        res.json({detailBody});
      });
    });
  } else if (body.upc) {
    // todo UPC code
  } else {
    res.json({error: 'Please provide a "text" or "upc" key in your request object.', success: false, data: null});
  }
});

app.listen(port, () => {
  console.log(`Server listening on port ${port}`);  
});