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4. Implementing OAuth 2.0 Authentication
 
 Intermediate Authentication      60 min       8 steps      15 min read  

# Implementing OAuth 2.0 Authentication

  A  admin  March 11, 2026   (Updated April 22, 2026)  

 

 

       

 

 

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 ##     Prerequisites 

Prerequisites



 

 

 

 

 

 ## On this page

  
  8 steps total 

 [    Back to top ](#main-content) 

 OAuth 2.0 enables your application to access APIs on behalf of users without handling their credentials directly. This guide implements the Authorization Code flow with PKCE.

## Step 1: Register Your Application

Create an OAuth application in the Developer Portal to get your client ID and configure redirect URIs.

## Step 2: Generate PKCE Challenge

function generateCodeVerifier() {\\n const array = new Uint8Array(32);\\n crypto.getRandomValues(array);\\n return base64UrlEncode(array);\\n}\\nconst codeVerifier = generateCodeVerifier();\\nconst codeChallenge = await sha256(codeVerifier);

## Step 3: Redirect to Authorization

Build the authorization URL and redirect the user:

const authUrl = new URL('<https://auth.connectbase.com/authorize>');\\nauthUrl.searchParams.set('client\_id', CLIENT\_ID);\\nauthUrl.searchParams.set('redirect\_uri', REDIRECT\_URI);\\nauthUrl.searchParams.set('response\_type', 'code');\\nauthUrl.searchParams.set('code\_challenge', codeChallenge);\\nauthUrl.searchParams.set('scope', 'read:buildings write:addresses');

## Step 4: Exchange Code for Tokens

Handle the callback and exchange the authorization code for access and refresh tokens.

## Step 5: Make Authenticated Requests

Include the access token in API requests:

const response = await fetch('<https://api.connectbase.com/v2/buildings>', {\\n headers: { 'Authorization': `Bearer ${accessToken}` }\\n});

## Step 6: Implement Token Refresh

Proactively refresh tokens before they expire to avoid interrupted user sessions.

## Step 7: Handle Revocation

Implement logout by revoking tokens at the revocation endpoint.

## Step 8: Security Checklist

✅ Always use HTTPS  
✅ Validate state parameter  
✅ Store tokens securely  
✅ Implement PKCE  
✅ Use minimal scopes



 

 

 

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