Gatsby build failed

Updated 11 October 2026

Short answer

Scroll up the build output to the first error. Gatsby usually names the step that failed (sourcing data, creating pages, running GraphQL queries, building HTML) and the file. The common causes are a data source failing (an API or CMS returning errors or changed fields), a bug in gatsby-node.js, a plugin incompatible with your Gatsby version, browser-only code during HTML generation, or a different Node.js version. Gatsby's docs suggest adding console.log to your build code to see what's happening.

What's the problem

gatsby build fails locally or on your host, often with "Building static HTML failed", a GraphQL error, or a plugin error.

Why it happens

  • A data source failing: a CMS or API down, a wrong token, or a field renamed.
  • A bug in gatsby-node.js or page creation code.
  • GraphQL queries asking for fields that no longer exist.
  • Browser-only code (window, document) running during static HTML generation.
  • Plugin or Node.js version mismatches.
  • Out of memory on large sites.

How to fix it

  1. Find the first error and the step and file it names.
  2. For data sourcing, check the CMS or API and its token.
  3. For GraphQL errors, check the fields still exist in your data.
  4. For "Building static HTML failed", find the browser-only code and guard it.
  5. Add console.log in your build code to see values.
  6. Match Node.js and plugin versions to what your Gatsby version supports.

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Sources

  1. Gatsby: Debugging the Build Processofficial docsOne of the fastest ways to gain insight into Gatsby’s build process is using the console functionality built into Node.js .

Related

Netlify build failed Read the deploy log from the first error. Usual causes: the build command, a missing environment variable, a different Node version, or the repo link. Vercel deployment failed Open the build logs on the deployment's page: the first error line is the cause. Usually a build command failing, a missing environment variable, or bad config. Node crash By default, an uncaught exception makes Node.js print the stack trace and exit. Read that trace, fix the error, and run Node under a process manager. React error If a React app goes blank, an error during rendering removed the UI. The console shows which component failed. Error Boundaries stop one bug blanking it all.

Preventionlabs is independent and not affiliated with Gatsby. Product names are used only to describe the problem.

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