Auth0 API Authorization — Securing APIs with Auth0

DodaTech Updated 2026-06-28 1 min read

In this tutorial, you'll learn about Auth0 Api Authorization. We cover key concepts, practical examples, and best practices to help you understand and apply this topic effectively.

Auth0 API authorization allows you to define custom scopes and enforce permission-based access on your APIs.

// Express API authorization middleware
const { auth } = require('express-oauth2-jwt-bearer');
const { requiredScopes } = require('express-oauth2-jwt-bearer');

const checkJwt = auth({
  audience: 'https://scan-api.example.com',
  issuerBaseURL: `https://{tenant}.auth0.com/`,
  tokenSigningAlg: 'RS256'
});

// Apply JWT validation to all routes
app.use('/api', checkJwt);

// Permission-based route protection
app.post('/api/scans',
  requiredScopes('scan:create'),
  async (req, res) => {
    const result = await scanService.startScan(req.body);
    res.status(201).json(result);
  }
);

app.get('/api/scans/:id',
  requiredScopes('scan:read'),
  async (req, res) => {
    const result = await scanService.getResult(req.params.id);
    res.json(result);
  }
);

API authorization with Auth0 enforces consistent access control across all your services.

← Previous Auth0 Universal Login — Customizing Auth0 Universal Login Pages Next → Auth0 CIAM Best Practices — Customer Identity and Access Management

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