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The builder

Build runs, the steps, the sandbox, the preview, and what to do when a run fails.

  1. 01What a build run isEvery change to your app is one build run — a single conversation between the builder and your project's files, with a beginning, an end and a record.
  2. 02Build stepsThe activity list under the builder's reply, line by line — what every step title means and which of them are worth reading closely.
  3. 03The sandboxEvery project gets its own isolated place to run — a real Next.js development server with real files. What it is, when it starts, and what it costs you.
  4. 04The previewThe right-hand pane on the project page shows your app actually running. What makes it appear, when it refreshes, and what each placeholder means.
  5. 05When a build failsEvery failure message the builder can produce, what causes each one, and the "Get me unstuck" button that exists for the cases you cannot fix by rewording.