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The Sentry Gatsby SDK provides error monitoring and performance tracking for Gatsby applications with automatic source map upload and build-time integration.

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Installation

npm install @sentry/gatsby

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Basic Setup

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Register as Plugin

Add Sentry to your gatsby-config.js: 
module.exports = {
  plugins: [
    {
      resolve: '@sentry/gatsby',
      options: {
        dsn: process.env.SENTRY_DSN,
        
        // Performance Monitoring
        tracesSampleRate: 1.0,
        
        // Source Maps
        release: process.env.SENTRY_RELEASE,
        
        // Optional: Disable client webpack plugin
        enableClientWebpackPlugin: true,
        
        // Optional: Delete source maps after upload
        deleteSourcemapsAfterUpload: false,
      },
    },
    // Your other plugins
  ],
};

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Initialize Sentry

Create gatsby-browser.js and gatsby-ssr.js: 
// gatsby-browser.js
import * as Sentry from '@sentry/gatsby';

Sentry.init({
  dsn: 'YOUR_DSN_HERE',
  
  integrations: [
    Sentry.browserTracingIntegration(),
    Sentry.replayIntegration(),
  ],
  
  // Performance Monitoring
  tracesSampleRate: 1.0,
  tracePropagationTargets: ['localhost', /^https:\/\/yourserver\.io\/api/],
  
  // Session Replay
  replaysSessionSampleRate: 0.1,
  replaysOnErrorSampleRate: 1.0,
});

// gatsby-ssr.js
import * as Sentry from '@sentry/gatsby';

Sentry.init({
  dsn: 'YOUR_DSN_HERE',
  tracesSampleRate: 1.0,
});

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Plugin Configuration

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Basic Options

// gatsby-config.js
module.exports = {
  plugins: [
    {
      resolve: '@sentry/gatsby',
      options: {
        dsn: process.env.SENTRY_DSN,
        
        // Sentry configuration
        environment: process.env.NODE_ENV,
        release: process.env.SENTRY_RELEASE,
        
        // Source map upload
        enableClientWebpackPlugin: true,
        deleteSourcemapsAfterUpload: true,
        
        // Webpack plugin options
        org: process.env.SENTRY_ORG,
        project: process.env.SENTRY_PROJECT,
        authToken: process.env.SENTRY_AUTH_TOKEN,
      },
    },
  ],
};

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Disable Source Map Upload

To disable automatic source map upload: 
{
  resolve: '@sentry/gatsby',
  options: {
    dsn: process.env.SENTRY_DSN,
    enableClientWebpackPlugin: false,
  },
}

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Error Handling

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React Component Errors

Use ErrorBoundary to catch React errors: 
import React from 'react';
import * as Sentry from '@sentry/gatsby';

function FallbackComponent({ error, resetError }) {
  return (
    <div>
      <h1>Something went wrong</h1>
      <button onClick={resetError}>Try again</button>
    </div>
  );
}

function MyApp({ children }) {
  return (
    <Sentry.ErrorBoundary fallback={FallbackComponent} showDialog>
      {children}
    </Sentry.ErrorBoundary>
  );
}

export default MyApp;

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Page Component Errors

// src/pages/products.js
import React, { useEffect, useState } from 'react';
import * as Sentry from '@sentry/gatsby';

function ProductsPage() {
  const [products, setProducts] = useState([]);
  
  useEffect(() => {
    async function fetchProducts() {
      try {
        const response = await fetch('/api/products');
        const data = await response.json();
        setProducts(data);
      } catch (error) {
        Sentry.captureException(error);
      }
    }
    
    fetchProducts();
  }, []);
  
  return (
    <div>
      <h1>Products</h1>
      {products.map(product => (
        <div key={product.id}>{product.name}</div>
      ))}
    </div>
  );
}

export default ProductsPage;

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Gatsby API Errors

// gatsby-node.js
import * as Sentry from '@sentry/gatsby';

export const createPages = async ({ graphql, actions }) => {
  const { createPage } = actions;
  
  try {
    const result = await graphql(`
      query {
        allMarkdownRemark {
          nodes {
            id
            frontmatter {
              slug
            }
          }
        }
      }
    `);
    
    if (result.errors) {
      Sentry.captureException(result.errors);
      throw result.errors;
    }
    
    result.data.allMarkdownRemark.nodes.forEach(node => {
      createPage({
        path: node.frontmatter.slug,
        component: require.resolve('./src/templates/blog-post.js'),
        context: { id: node.id },
      });
    });
  } catch (error) {
    Sentry.captureException(error);
    throw error;
  }
};

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Performance Monitoring

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Route Changes

Route changes are automatically tracked with browserTracingIntegration.

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Custom Transactions

import * as Sentry from '@sentry/gatsby';

export async function fetchUserData(userId) {
  return await Sentry.startSpan(
    {
      name: 'fetch-user-data',
      op: 'http.client',
      attributes: {
        userId,
      },
    },
    async () => {
      const response = await fetch(`/api/users/${userId}`);
      return response.json();
    },
  );
}

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GraphQL Query Tracking

import * as Sentry from '@sentry/gatsby';
import { useStaticQuery, graphql } from 'gatsby';

function MyComponent() {
  return Sentry.startSpan(
    { name: 'graphql-query', op: 'graphql' },
    () => {
      const data = useStaticQuery(graphql`
        query {
          site {
            siteMetadata {
              title
            }
          }
        }
      `);
      
      return <h1>{data.site.siteMetadata.title}</h1>;
    },
  );
}

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Context and User Information

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Setting User Context

// gatsby-browser.js
import * as Sentry from '@sentry/gatsby';

export const onClientEntry = () => {
  // Set user from authentication
  const user = getCurrentUser();
  
  if (user) {
    Sentry.setUser({
      id: user.id,
      email: user.email,
      username: user.username,
    });
  }
};

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Route Context

// gatsby-browser.js
import * as Sentry from '@sentry/gatsby';

export const onRouteUpdate = ({ location, prevLocation }) => {
  Sentry.setContext('navigation', {
    from: prevLocation?.pathname,
    to: location.pathname,
  });
  
  Sentry.setTag('route', location.pathname);
};

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Environment Variables

Create a .env.production file: 
# Required
SENTRY_DSN=your-dsn-here

# For source maps
SENTRY_ORG=your-org
SENTRY_PROJECT=your-project
SENTRY_AUTH_TOKEN=your-auth-token

# Optional
SENTRY_RELEASE=1.0.0
SENTRY_ENVIRONMENT=production
Make DSN available to browser: 
// gatsby-config.js
module.exports = {
  plugins: [
    {
      resolve: 'gatsby-plugin-env-variables',
      options: {
        allowList: ['SENTRY_DSN'],
      },
    },
  ],
};

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Source Maps

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Automatic Upload

Source maps are automatically uploaded when: 
// gatsby-config.js
{
  resolve: '@sentry/gatsby',
  options: {
    dsn: process.env.SENTRY_DSN,
    enableClientWebpackPlugin: true,
    org: process.env.SENTRY_ORG,
    project: process.env.SENTRY_PROJECT,
    authToken: process.env.SENTRY_AUTH_TOKEN,
  },
}

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Clean Up Source Maps

Delete source maps after upload: 
{
  resolve: '@sentry/gatsby',
  options: {
    dsn: process.env.SENTRY_DSN,
    deleteSourcemapsAfterUpload: true,
  },
}

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Gatsby Cloud

For Gatsby Cloud deployments:
  1. Add environment variables in Gatsby Cloud dashboard
  2. Enable build webhook notifications
  3. Configure release tracking:
// gatsby-config.js
module.exports = {
  plugins: [
    {
      resolve: '@sentry/gatsby',
      options: {
        dsn: process.env.SENTRY_DSN,
        release: process.env.GATSBY_CLOUD_COMMIT_SHA,
      },
    },
  ],
};

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Best Practices

ErrorBoundary

Wrap your app layout with ErrorBoundary for global error catching.

Source Maps

Enable source map upload for production builds.

User Context

Set user context in onClientEntry hook.

Route Tracking

Use onRouteUpdate to track navigation context.

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Troubleshooting

Ensure:
  1. Plugin is in gatsby-config.js plugins array
  2. Package is installed correctly
  3. DSN is set in options or environment
Verify:
  1. enableClientWebpackPlugin: true
  2. SENTRY_AUTH_TOKEN is set
  3. org and project are correct
Check:
  1. Gatsby and React versions are compatible
  2. All peer dependencies are installed
  3. Webpack configuration isn’t conflicting

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Next Steps

ErrorBoundary

Advanced error boundary patterns

GraphQL

Track GraphQL query performance

Session Replay

Debug with session recordings

Gatsby Cloud

Configure for Gatsby Cloud deployments

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