Integrate Buildium's REST API into your Bolt.new app by generating an API key in your Buildium account, creating Next.js API routes to proxy requests, and building a property management dashboard. The HTTP-based API works seamlessly in Bolt's WebContainer for outbound data fetching — pull properties, tenants, leases, work orders, and financials to create a unified landlord dashboard without leaving your app.
Build a Property Management Dashboard with Buildium and Bolt.new
Buildium's REST API exposes the full data model behind one of the most widely used property management platforms for residential landlords. Through the API, you can read and write properties, units, rental owners, tenants, leases, maintenance requests, work orders, journal entries, and accounting reports. For small-to-mid property managers who want a custom dashboard — or for SaaS builders targeting the residential property management market — Bolt.new's rapid development cycle pairs naturally with Buildium's structured API.
The integration is straightforward from a technical standpoint: Buildium uses HTTP Basic authentication with a Client ID and Client Secret, both generated from your Buildium account. All API endpoints are versioned REST under `https://api.buildium.com/api/v1/`, returning JSON. There are no WebSocket requirements, no OAuth redirects, and no native Node.js modules — making this a clean HTTP-only integration that works in Bolt's WebContainer from the first API call.
Typical use cases include custom owner portals (showing property performance, rent income, and vacancy rates), maintenance dashboards (open work orders by property and priority), and financial summaries (rent collected vs. outstanding balances). Because the API covers both reading and writing, you can also build workflows that create maintenance requests, update tenant records, or log journal entries directly from your custom interface.
Integration method
Bolt generates Next.js API routes that proxy requests to Buildium's REST API using your API credentials. Because Buildium uses simple API key authentication over HTTPS, outbound calls work well in Bolt's WebContainer during development. Webhook notifications from Buildium (for real-time rent payment alerts, maintenance updates) require a deployed URL and cannot be received in the WebContainer preview.
Prerequisites
- An active Buildium account (Essential, Growth, or Premium plan — API access is not on the free trial)
- API credentials generated in Buildium under Administration → Application Program Interface
- A Bolt.new project using Next.js (for server-side API routes to keep credentials secure)
- Basic understanding of REST APIs and JSON data structures
- Properties and tenants already entered in your Buildium account to populate the dashboard
Step-by-step guide
Generate Buildium API Credentials
Generate Buildium API Credentials
Log into your Buildium account and navigate to Administration (the gear icon in the top navigation). Look for the 'Application Program Interface' section — in most plan levels this is under Administration → API. Click 'Create a new credential set'. Give it a descriptive name like 'Bolt Dashboard Integration'. Buildium will generate a Client ID and a Client Secret. Copy both values immediately — the secret is only shown once. Store these in a secure location. Buildium uses HTTP Basic authentication: every API request must include an Authorization header formatted as `Basic {base64(clientId:clientSecret)}`. Note that Buildium API access requires at minimum the Essential plan — the free trial does not include API access. If you are on a trial, the API section may not appear in Administration. Once you have credentials, test them with a simple curl or fetch call to `https://api.buildium.com/api/v1/properties` to verify they work before building the full integration in Bolt.
Set up a Buildium API integration in my Next.js app. Create a utility file at lib/buildium.ts that exports a buildiumFetch helper function. It should take an endpoint path and optional query params, construct the Authorization header using Basic auth from BUILDIUM_CLIENT_ID and BUILDIUM_CLIENT_SECRET environment variables (base64 encoded), call the Buildium API at https://api.buildium.com/api/v1/{endpoint}, and return the parsed JSON response. Handle pagination using the offset and limit query params.
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1// lib/buildium.ts2const BUILDIUM_BASE_URL = 'https://api.buildium.com/api/v1';34function getAuthHeader(): string {5 const clientId = process.env.BUILDIUM_CLIENT_ID!;6 const clientSecret = process.env.BUILDIUM_CLIENT_SECRET!;7 const encoded = Buffer.from(`${clientId}:${clientSecret}`).toString('base64');8 return `Basic ${encoded}`;9}1011export interface BuildiumListResponse<T> {12 data: T[];13 total: number;14 page: number;15 pageSize: number;16}1718export async function buildiumFetch<T>(19 endpoint: string,20 params: Record<string, string | number> = {}21): Promise<BuildiumListResponse<T>> {22 const url = new URL(`${BUILDIUM_BASE_URL}${endpoint}`);23 Object.entries(params).forEach(([k, v]) => url.searchParams.set(k, String(v)));2425 const response = await fetch(url.toString(), {26 headers: {27 Authorization: getAuthHeader(),28 'Content-Type': 'application/json',29 },30 });3132 if (!response.ok) {33 const error = await response.text();34 throw new Error(`Buildium API error ${response.status}: ${error}`);35 }3637 return response.json();38}3940export async function buildiumPost<T>(41 endpoint: string,42 body: unknown43): Promise<T> {44 const response = await fetch(`${BUILDIUM_BASE_URL}${endpoint}`, {45 method: 'POST',46 headers: {47 Authorization: getAuthHeader(),48 'Content-Type': 'application/json',49 },50 body: JSON.stringify(body),51 });5253 if (!response.ok) {54 const error = await response.text();55 throw new Error(`Buildium API error ${response.status}: ${error}`);56 }5758 return response.json();59}Pro tip: Buildium's API returns paginated results. The default page size is 50. For large portfolios, implement pagination using the 'offset' query parameter to fetch all records.
Expected result: The buildium.ts utility is ready and will authenticate all API calls using your stored credentials.
Create API Routes for Properties and Units
Create API Routes for Properties and Units
With the Buildium fetch utility ready, create Next.js API routes that serve property data to your frontend. The primary endpoint for properties is `/rentals` (Buildium calls residential properties 'rentals'). Each rental has an ID, address, unit count, and status. Units within a property are nested under `/rentals/{id}/units`. For a portfolio overview, you typically want all properties with their addresses and occupancy status. Create a single `/api/buildium/properties` route that fetches all rentals, optionally enriching each with unit counts. Keep API calls server-side to avoid CORS issues — Buildium's API does not whitelist browser origins, so all requests must go through your Next.js API routes. This is also where your credentials stay safe, never reaching the client bundle. Since Buildium's API uses HTTP (no TCP sockets, no binary protocols), it works perfectly in Bolt's WebContainer during development — you can test data fetching in the preview before deploying.
Create a Next.js API route at app/api/buildium/properties/route.ts that fetches all rental properties from Buildium using the buildiumFetch helper from lib/buildium.ts. Return the list as JSON with id, address (street, city, state, zip), unitCount, and status. Also create app/api/buildium/work-orders/route.ts that fetches open work orders with status, priority, description, property details, and assignee.
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1// app/api/buildium/properties/route.ts2import { NextResponse } from 'next/server';3import { buildiumFetch } from '@/lib/buildium';45export async function GET() {6 try {7 const result = await buildiumFetch<{8 Id: number;9 Address: { AddressLine1: string; City: string; State: string; PostalCode: string };10 Status: string;11 NumberUnits: number;12 }>('/rentals', { limit: 100, offset: 0 });1314 const properties = result.data.map((p) => ({15 id: p.Id,16 address: {17 street: p.Address.AddressLine1,18 city: p.Address.City,19 state: p.Address.State,20 zip: p.Address.PostalCode,21 },22 status: p.Status,23 unitCount: p.NumberUnits,24 }));2526 return NextResponse.json({ properties, total: result.total });27 } catch (error) {28 console.error('Buildium properties error:', error);29 return NextResponse.json({ error: 'Failed to fetch properties' }, { status: 500 });30 }31}Pro tip: Buildium calls residential properties 'rentals' in the API — the endpoint is /rentals, not /properties. Association properties (HOAs, condos) use a separate /associations endpoint.
Expected result: GET /api/buildium/properties returns a JSON array of your portfolio's properties with addresses and unit counts.
Fetch Tenant and Lease Data
Fetch Tenant and Lease Data
Active tenants and their lease details are the core of any rent tracking dashboard. Buildium's API has separate endpoints for tenants (`/rentals/tenants`) and leases (`/rentals/leases`). Leases contain the critical financial fields: monthly rent amount, lease start/end dates, security deposit, and the associated unit. Tenants contain contact information — name, email, phone. The relationship is: Unit → Lease → Tenant. A unit can have one active lease at a time. To build a rent collection view, fetch active leases and for each lease retrieve the current rent balance. The `/rentals/leases/{leaseId}/outstandingbalances` endpoint returns the current balance owed. Alternatively, the `/rentals/leases/{leaseId}/transactions` endpoint shows the full payment history. For most dashboard use cases, fetching all active leases with their rent amounts and then comparing against payments received this month gives you the collection rate. Create an API route that returns this combined data to power the rent collection section of your dashboard.
Create app/api/buildium/leases/route.ts that fetches all active leases from Buildium's /rentals/leases endpoint with status=Active. For each lease return: id, unitId, propertyId, tenantName, monthlyRent, leaseStartDate, leaseEndDate, and outstandingBalance from /rentals/leases/{id}/outstandingbalances. Limit to 50 leases initially.
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1// app/api/buildium/leases/route.ts2import { NextResponse } from 'next/server';3import { buildiumFetch } from '@/lib/buildium';45interface Lease {6 Id: number;7 Unit: { Id: number; UnitNumber: string; Address: { AddressLine1: string } };8 Tenants: Array<{ Id: number; FirstName: string; LastName: string; Email: string }>;9 Rent: number;10 StartDate: string;11 EndDate: string;12 LeaseStatus: string;13}1415interface OutstandingBalance {16 TotalBalance: number;17}1819export async function GET() {20 try {21 const leasesResult = await buildiumFetch<Lease>('/rentals/leases', {22 status: 'Active',23 limit: 50,24 offset: 0,25 });2627 const leases = await Promise.all(28 leasesResult.data.map(async (lease) => {29 let outstandingBalance = 0;30 try {31 const balanceResult = await buildiumFetch<OutstandingBalance>(32 `/rentals/leases/${lease.Id}/outstandingbalances`33 );34 outstandingBalance = balanceResult.data[0]?.TotalBalance ?? 0;35 } catch {36 // Balance fetch failed — use 037 }3839 const primaryTenant = lease.Tenants[0];40 return {41 id: lease.Id,42 unit: lease.Unit.UnitNumber,43 propertyAddress: lease.Unit.Address.AddressLine1,44 tenantName: primaryTenant45 ? `${primaryTenant.FirstName} ${primaryTenant.LastName}`46 : 'Unknown',47 tenantEmail: primaryTenant?.Email ?? '',48 monthlyRent: lease.Rent,49 startDate: lease.StartDate,50 endDate: lease.EndDate,51 outstandingBalance,52 };53 })54 );5556 return NextResponse.json({ leases, total: leasesResult.total });57 } catch (error) {58 console.error('Buildium leases error:', error);59 return NextResponse.json({ error: 'Failed to fetch leases' }, { status: 500 });60 }61}Pro tip: Fetching outstanding balances for each lease individually can be slow for large portfolios. Consider fetching leases first and loading balances lazily on demand, or batching requests.
Expected result: GET /api/buildium/leases returns active leases with tenant names, monthly rent amounts, and current outstanding balances.
Build the Dashboard UI and Add Webhooks for Real-Time Updates
Build the Dashboard UI and Add Webhooks for Real-Time Updates
With API routes serving properties, leases, and work orders, prompt Bolt to assemble the dashboard UI. A well-structured property management dashboard typically has three main sections: a Portfolio Overview (total properties, total units, occupancy rate, monthly income), a Rent Collection Table (tenant name, unit, rent amount, balance due, days overdue), and a Maintenance Queue (open work orders sorted by priority). Use Recharts or Chart.js for any charts — both install cleanly in Bolt's WebContainer. For real-time updates (tenant just paid rent, new maintenance request submitted), Buildium supports webhooks. To receive webhooks, you must deploy your app to Netlify or Bolt Cloud — Bolt's WebContainer cannot accept incoming HTTP connections. After deploying, register your webhook endpoint in Buildium under Administration → Webhooks, pointing to `https://your-app.netlify.app/api/buildium/webhook`. Your webhook handler should verify the Buildium-Signature header and update your dashboard data accordingly. During development in Bolt's preview, use polling or manual refresh instead of webhooks.
Build a property management dashboard at app/dashboard/page.tsx with three sections: (1) Portfolio Overview cards showing total properties, occupied units, vacancy rate, and monthly expected income; (2) Rent Collection table with tenant name, unit, monthly rent, outstanding balance, and status badge (Paid/Outstanding/Overdue); (3) Work Orders table showing property, issue description, priority badge (color-coded), and days open. Fetch data from /api/buildium/properties, /api/buildium/leases, and /api/buildium/work-orders.
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1// app/api/buildium/webhook/route.ts2import { NextRequest, NextResponse } from 'next/server';3import crypto from 'crypto';45// NOTE: Webhooks only work on deployed apps (Netlify/Bolt Cloud)6// The WebContainer cannot receive incoming HTTP connections7export async function POST(request: NextRequest) {8 const body = await request.text();9 const signature = request.headers.get('buildium-signature') ?? '';1011 // Verify webhook signature12 const webhookSecret = process.env.BUILDIUM_WEBHOOK_SECRET!;13 const expectedSig = crypto14 .createHmac('sha256', webhookSecret)15 .update(body)16 .digest('hex');1718 if (signature !== expectedSig) {19 return NextResponse.json({ error: 'Invalid signature' }, { status: 401 });20 }2122 const event = JSON.parse(body);23 console.log('Buildium webhook event:', event.EventType);2425 // Handle different event types26 switch (event.EventType) {27 case 'Payment_Created':28 // Trigger dashboard refresh or update payment status in DB29 break;30 case 'WorkOrder_Created':31 case 'WorkOrder_Updated':32 // Update work order status in DB or notify team33 break;34 case 'Lease_Created':35 // New lease signed — update occupancy metrics36 break;37 }3839 return NextResponse.json({ received: true });40}Pro tip: Register your webhook in Buildium after deploying. During development in Bolt's WebContainer preview, use a 'Refresh Data' button instead of expecting webhooks to arrive — the preview environment cannot receive incoming connections.
Expected result: The dashboard displays live property, lease, and work order data. After deploying and registering the webhook, payment and maintenance events update the data automatically.
Common use cases
Owner Portal with Rent and Vacancy Summary
Build a custom portal for rental property owners showing all their properties, current occupancy status, monthly rent collected vs. expected, and outstanding balances. Owners get a cleaner view than Buildium's native interface, focused on the metrics they care about most.
Build a property owner dashboard using the Buildium API. Show a list of all properties with their address, unit count, occupancy rate, and monthly expected rent. Add a summary card at the top showing total portfolio value, total rent collected this month, and number of vacant units. Use the Buildium API with credentials from environment variables.
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Maintenance Request Tracker
Display all open maintenance requests across a portfolio sorted by priority and age. Property managers can see at a glance which work orders are overdue, which vendors are assigned, and which units have recurring issues. Filter by property, status, and category.
Create a maintenance tracker that fetches all open work orders from the Buildium API. Display them in a table with columns: property address, unit, issue description, priority (Emergency/High/Normal/Low), status, days open, and assigned vendor. Add filters for property and priority. Highlight emergency items in red.
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Rent Collection Dashboard
Show current month's rent collection status across all units — paid, outstanding, and late with days overdue. Display a pie chart of collection rate, a list of tenants with outstanding balances, and total revenue vs. expected for the month.
Build a rent collection dashboard using the Buildium API. Fetch all active leases and their latest payment status. Show a summary with total expected rent, total collected, and total outstanding. List tenants with outstanding balances including their unit, balance amount, and days overdue. Add a donut chart showing the collection rate percentage.
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Troubleshooting
API calls return 401 Unauthorized even with correct credentials
Cause: The Authorization header must use HTTP Basic auth with the Client ID and Client Secret base64 encoded as 'clientId:clientSecret'. Missing the colon separator or encoding the values separately (instead of together) causes authentication failure.
Solution: Ensure you encode `clientId:clientSecret` (with the colon) as a single base64 string: Buffer.from(`${clientId}:${clientSecret}`).toString('base64'). Verify the API credentials are still active in Buildium under Administration → API.
1const encoded = Buffer.from(`${process.env.BUILDIUM_CLIENT_ID}:${process.env.BUILDIUM_CLIENT_SECRET}`).toString('base64');2const authHeader = `Basic ${encoded}`;Properties endpoint returns an empty array even though properties exist in Buildium
Cause: Buildium has separate property types: Residential Rentals use /rentals, Association Properties (HOAs) use /associations. Querying the wrong endpoint returns no data.
Solution: Confirm which property type you manage. Use /rentals for single-family homes, apartments, and multi-family units. Use /associations for condos and HOA communities. You may need to query both endpoints and merge the results for a mixed portfolio.
Webhook events are not arriving at the API route
Cause: Buildium webhooks send HTTP POST requests to your registered URL. Bolt's WebContainer preview environment cannot receive incoming HTTP connections — only outbound calls work in the browser-based runtime.
Solution: Deploy your app to Netlify or Bolt Cloud to get a public URL, then register that URL in Buildium under Administration → Webhooks. During development, test webhook logic by manually calling your webhook endpoint with sample payloads using a tool like Postman.
Outstanding balance API calls are slow or timing out for large portfolios
Cause: Fetching outstanding balances requires a separate API call per lease, creating N+1 request patterns that are slow at scale.
Solution: Implement lazy loading: show the lease list immediately, then load balances asynchronously per-row using a small React effect. Alternatively, cache lease data in Bolt Database or Supabase and refresh it on a schedule rather than on every page load.
Best practices
- Never expose your Buildium Client ID or Client Secret in client-side code — always proxy API calls through server-side Next.js API routes
- Use Buildium's pagination parameters (limit and offset) rather than fetching all records at once — large portfolios can have hundreds of leases and work orders
- Cache frequently-accessed data like property lists and tenant rosters in Bolt Database or Supabase, refreshing on a schedule or when webhooks signal changes
- Register webhooks only after deploying to a stable URL — Bolt's WebContainer preview cannot receive incoming HTTP connections
- Handle Buildium API rate limits gracefully with exponential backoff retry logic — the API enforces per-minute and per-day request limits
- Use Buildium's test environment (sandbox) if available for your plan to avoid creating test data in your live property management account
- Structure your API routes to return normalized data shapes optimized for your UI rather than passing raw Buildium API responses directly to the frontend
Alternatives
Yardi targets larger commercial and enterprise property management companies with more complex accounting and compliance requirements.
Propertybase focuses on real estate CRM and sales pipeline management for agents and brokerages rather than landlord operations.
Realtor.com's API provides listing and property data for home search and valuation tools rather than active property management.
CoStar specializes in commercial real estate analytics and market data, suited to investors and commercial brokers over residential landlords.
Frequently asked questions
Does Buildium offer a free trial with API access?
Buildium's free trial does not include API access. You need at minimum the Essential plan to generate API credentials under Administration → Application Program Interface. Contact Buildium sales if you want to evaluate the API before committing to a paid plan.
Can I write data back to Buildium through the API, or is it read-only?
The Buildium API supports both reading and writing. You can create maintenance requests, update tenant records, post journal entries, and record payments through POST and PUT endpoints. Use the buildiumPost helper from lib/buildium.ts for write operations, always sending JSON with the Content-Type header set to application/json.
How do I connect Bolt.new to Buildium without exposing my API credentials?
Store your BUILDIUM_CLIENT_ID and BUILDIUM_CLIENT_SECRET in a .env.local file for development, and in your hosting provider's environment variables for production (Netlify Site Configuration → Environment Variables or Bolt Cloud's Secrets panel). All API calls must go through server-side Next.js API routes — never call the Buildium API directly from client-side React components.
Can Buildium webhooks work in Bolt's preview?
No — Bolt's WebContainer runs entirely in the browser and cannot receive incoming HTTP connections. Webhooks require a publicly accessible URL. Deploy to Netlify or Bolt Cloud first, then register your deployed URL as the webhook endpoint in Buildium's Administration settings. During development, test webhook handlers by sending mock POST requests manually.
What's the difference between /rentals and /associations in the Buildium API?
Buildium separates residential rental properties (single-family homes, apartments, multi-family buildings) from association properties (condominiums, HOA-managed communities). If you manage rentals, use the /rentals endpoints. If you manage HOAs or condominiums, use the /associations endpoints. Mixed-portfolio managers need to query both and merge the results.
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