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fetch('/') in the Repl causing infinite errors #59731

Description

@jasnell

Version

24.7.0

Platform

All

Subsystem

repl

What steps will reproduce the bug?

Open the repl, type fetch('/'). ... (the period at the end triggers it)

How often does it reproduce? Is there a required condition?

Always

What is the expected behavior? Why is that the expected behavior?

It should print a single error because the URL is not absolute...

What do you see instead?

The repl enters a busy loop trying to parse the URL over and over

...
> Uncaught [TypeError: Failed to parse URL from /] {
  [cause]: TypeError: Invalid URL
      at new URL (node:internal/url:826:25)
      at new Request (node:internal/deps/undici/undici:10150:25)
      at fetch (node:internal/deps/undici/undici:10920:25)
      at fetch (node:internal/deps/undici/undici:15443:10)
      at fetch (node:internal/bootstrap/web/exposed-window-or-worker:83:12)
      at REPL199480:1:7
      at ContextifyScript.runInThisContext (node:vm:137:12)
      at REPLServer.defaultEval (node:repl:599:22)
      at bound (node:domain:433:15)
      at REPLServer.runBound [as eval] (node:domain:444:12) {
    code: 'ERR_INVALID_URL',
    input: '/'
  }
}
> Uncaught [TypeError: Failed to parse URL from /] {
  [cause]: TypeError: Invalid URL
      at new URL (node:internal/url:826:25)
      at new Request (node:internal/deps/undici/undici:10150:25)
      at fetch (node:internal/deps/undici/undici:10920:25)
      at fetch (node:internal/deps/undici/undici:15443:10)
      at fetch (node:internal/bootstrap/web/exposed-window-or-worker:83:12)
      at REPL199481:1:7
      at ContextifyScript.runInThisContext (node:vm:137:12)
      at REPLServer.defaultEval (node:repl:599:22)
      at bound (node:domain:433:15)
      at REPLServer.runBound [as eval] (node:domain:444:12) {
    code: 'ERR_INVALID_URL',
    input: '/'
  }
}
> Uncaught [TypeError: Failed to parse URL from /] {
  [cause]: TypeError: Invalid URL
      at new URL (node:internal/url:826:25)
      at new Request (node:internal/deps/undici/undici:10150:25)
      at fetch (node:internal/deps/undici/undici:10920:25)
      at fetch (node:internal/deps/undici/undici:15443:10)
      at fetch (node:internal/bootstrap/web/exposed-window-or-worker:83:12)
      at REPL199482:1:7
      at ContextifyScript.runInThisContext (node:vm:137:12)
      at REPLServer.defaultEval (node:repl:599:22)
      at bound (node:domain:433:15)
      at REPLServer.runBound [as eval] (node:domain:444:12) {
    code: 'ERR_INVALID_URL',
    input: '/'
  }
}
> Uncaught [TypeError: Failed to parse URL from /] {
  [cause]: TypeError: Invalid URL
      at new URL (node:internal/url:826:25)
      at new Request (node:internal/deps/undici/undici:10150:25)
      at fetch (node:internal/deps/undici/undici:10920:25)
      at fetch (node:internal/deps/undici/undici:15443:10)
      at fetch (node:internal/bootstrap/web/exposed-window-or-worker:83:12)
      at REPL199483:1:7
      at ContextifyScript.runInThisContext (node:vm:137:12)
      at REPLServer.defaultEval (node:repl:599:22)
      at bound (node:domain:433:15)
      at REPLServer.runBound [as eval] (node:domain:444:12) {
    code: 'ERR_INVALID_URL',
    input: '/'
  }
}
> zsh: killed     node

Additional information

No response

Activity

  1. added
    confirmed-bugIssues and PRs for confirmed bugs.
    replIssues and PRs related to the REPL subsystem.
    on Sep 2, 2025
  2. minzunim commented on Sep 4, 2025

    @minzunim

    @jasnell I tried to reproduce this issue, but in my environment I only see a single error message printed.
    Could you please provide additional details on how to reproduce the infinite loop?

    My environment:

    • Node.js version: 24.7.0
    • OS: Windows 11
  3. added
    needs more infoIssues awaiting more information or a reproducible example from the author.
    on Sep 4, 2025
  4. targos commented on Sep 4, 2025

    @targos
    Member

    Can't reproduce either (v24.7.0 on macOS)

  5. removed
    confirmed-bugIssues and PRs for confirmed bugs.
    good first issueIssues that are suitable for first-time contributors.
    on Sep 4, 2025
  6. jasnell commented on Sep 7, 2025

    @jasnell
    MemberAuthor

    The report is incomplete, you need to type fetch('/'). .. the period at the end is significant. I believe #59774 fixes this.

  7. removed
    needs more infoIssues awaiting more information or a reproducible example from the author.
    on Sep 8, 2025
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