Reading and Writing Data Using the Holded API

Hey there, fellow JavaScript wizards! Ready to dive into the world of Holded API integration? Let's roll up our sleeves and get our hands dirty with some code.

The Lowdown on Holded API

Holded's API is your ticket to seamlessly syncing data for user-facing integrations. It's robust, well-documented, and just waiting for you to work your magic.

Authentication: Your All-Access Pass

First things first, you'll need to grab those API credentials. Once you've got 'em, let's implement that OAuth 2.0 flow:

const axios = require('axios');

async function getAccessToken(clientId, clientSecret, code) {
  const response = await axios.post('https://api.holded.com/oauth/token', {
    grant_type: 'authorization_code',
    client_id: clientId,
    client_secret: clientSecret,
    code: code
  });
  return response.data.access_token;
}

Easy peasy, right? Now you're ready to rock and roll!

Reading Data: Time to Get Nosy

When it comes to fetching data, Holded's got your back with well-structured endpoints. Here's how you might grab some customer data:

async function getCustomers(accessToken, page = 1, limit = 100) {
  const response = await axios.get(`https://api.holded.com/api/invoicing/v1/customers`, {
    headers: { 'Authorization': `Bearer ${accessToken}` },
    params: { page, limit }
  });
  return response.data;
}

Pro tip: Keep an eye on those rate limits, and pagination is your friend for large datasets!

Writing Data: Time to Make Your Mark

Creating or updating data is just as straightforward. Let's create an invoice:

async function createInvoice(accessToken, invoiceData) {
  const response = await axios.post('https://api.holded.com/api/invoicing/v1/invoices', invoiceData, {
    headers: { 'Authorization': `Bearer ${accessToken}` }
  });
  return response.data;
}

Remember, always validate your data before sending it off. Holded will let you know if something's amiss, but it's better to catch issues early!

Syncing Strategies: Keep It Fresh

When it comes to syncing, you've got options. Incremental syncs are great for keeping things speedy, but sometimes a full sync is necessary. Here's a basic sync function to get you started:

async function syncData(accessToken, lastSyncTimestamp) {
  const updatedData = await getUpdatedData(accessToken, lastSyncTimestamp);
  for (const item of updatedData) {
    await updateLocalData(item);
  }
  return new Date().toISOString();
}

Webhooks: Real-time Magic

Holded's webhooks are like having a personal assistant that never sleeps. Here's how you might handle a webhook event:

app.post('/webhook', (req, res) => {
  const event = req.body;
  console.log(`Received event: ${event.type}`);
  // Process the event
  res.sendStatus(200);
});

Error Handling: Expect the Unexpected

Nobody's perfect, and neither are APIs. Let's wrap our requests in some error-handling goodness:

async function apiRequest(fn) {
  try {
    return await fn();
  } catch (error) {
    console.error(`API Error: ${error.message}`);
    // Handle the error appropriately
  }
}

Performance Optimization: Speed Demon

Want to really impress? Implement some caching:

const cache = new Map();

function getCachedData(key, ttl = 60000) {
  const cached = cache.get(key);
  if (cached && Date.now() - cached.timestamp < ttl) {
    return cached.data;
  }
  return null;
}

function setCachedData(key, data) {
  cache.set(key, { data, timestamp: Date.now() });
}

Wrapping Up

And there you have it, folks! You're now armed and dangerous with the knowledge to build some killer Holded API integrations. Remember, the API docs are your best friend, so keep 'em close.

Now go forth and code! Your users are waiting for that sweet, sweet data sync. You've got this! 🚀