TypeError: configPath.endsWith is not a function

[saeedesmaili]

Running npx localflare I'm getting:

✗ Wrangler exited with code 1

Logs:

--- 2026-01-25T10:16:21.507Z debug
Failed to parse config. Disabling metrics dispatcher. TypeError: configPath.endsWith is not a function
    at parseRawConfigFile (/Volumes/w/code/test-project/node_modules/wrangler/wrangler-dist/cli.js:6307:22)
    at Object.experimental_readRawConfig (/Volumes/w/code/test-project/node_modules/wrangler/wrangler-dist/cli.js:6317:25)
    at /Volumes/w/code/test-project/node_modules/wrangler/wrangler-dist/cli.js:275064:51
    at /Volumes/w/code/test-project/node_modules/wrangler/wrangler-dist/cli.js:147124:22
    at Array.reduce (<anonymous>)
    at applyMiddleware (/Volumes/w/code/test-project/node_modules/wrangler/wrangler-dist/cli.js:147112:22)
    at CommandInstance.applyMiddlewareAndGetResult (/Volumes/w/code/test-project/node_modules/wrangler/wrangler-dist/cli.js:147475:34)
    at CommandInstance.runCommand (/Volumes/w/code/test-project/node_modules/wrangler/wrangler-dist/cli.js:147383:216)
    at [runYargsParserAndExecuteCommands] (/Volumes/w/code/test-project/node_modules/wrangler/wrangler-dist/cli.js:150205:96)
    at YargsInstance.parse (/Volumes/w/code/test-project/node_modules/wrangler/wrangler-dist/cli.js:149542:63)
---

I'm using wrangler.jsonc but I get the same error when trying npx localflare wrangler.jsonc. How can I troubleshoot this? I'm using wrangler dev for running my project without any issues.

[rohanprasadofficial]

localflare uses wrangler's multi-config mode (passing two -c flags) to run both the localflare API and your worker together. The error configPath.endsWith is not a function is a bug in wrangler's metrics dispatcher when handling multiple configs.

Here are some troubleshooting steps:

1. Check wrangler version
   npx wrangler --version

The multi-config mode can be buggy in certain wrangler versions. Try updating wrangler:
npm install wrangler@latest

2. Run with verbose mode to see the actual command:
   npx localflare --verbose

3. Try the attach mode instead - this runs localflare separately without multi-config:

Terminal 1: Run your worker normally

wrangler dev

Terminal 2: Attach localflare

npx localflare attach