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StackBlitz npm ERR! code ERESOLVE Conflicting Peer Dependency

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Workaround available All browsers Updated November 14, 2026How we research

Quick answer

npm 7+ installs peer dependencies automatically, causing conflicts. Use --legacy-peer-deps; StackBlitz retries with it for you during automatic installs.

Most likely fix: Reinstall without the lockfile

How to fix it

Try these in order — the most common fix is first.

  1. 1. Reinstall without the lockfile

    1. Delete package-lock.json
    2. Run npm install
    3. Save the project
    Did this fix it?

  2. 2. Use legacy peer deps

    1. Run npm install --legacy-peer-deps
    Did this fix it?

  3. 3. Force the install

    1. Run npm install --force
    Did this fix it?

Symptoms

npm install fails with npm ERR! code ERESOLVE or Conflicting peer dependency.

Why it happens

  • npm 7+ auto-installs peer dependencies

This guide also covers

  • stackblitz npm err eresolve
  • stackblitz conflicting peer dependency

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Other StackBlitz errors

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