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src/content/changelog/workers/2025-08-22-wrangler-dev-multi-config-cross-command-support.mdx

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date: 2025-08-22
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Workers using `wrangler dev` with multiple config files can now communicate with Workers running in separate dev commands using service bindings and tail consumers.
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Previously, cross-command communication only worked when using a single config file. Now it works with multiple configs:
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You can run multiple Workers in a single dev command by passing multiple config files to `wrangler dev` (e.g., `wrangler dev --config api.toml --config frontend.toml`). Previously, these Workers could not communicate with Workers running in separate dev commands. Now service bindings and tail consumers work across dev commands:
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```sh
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# Terminal 1
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wrangler dev
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# Terminal 2
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# Terminal 1 - Main Application
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wrangler dev --config ./api/wrangler.jsonc --config ./app/wrangler.jsonc
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```
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This means Workers can now communicate with each other across separate dev commands, regardless of your development setup.
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# Terminal 2 - Shared Worker (e.g. auth)
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wrangler dev --config ./auth/wrangler.jsonc
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```
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Check out the [Developing with multiple Workers](/workers/development-testing/multi-workers) guide to learn more about the different approaches and when to use each one.
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Workers can now communicate with each other across separate dev commands, regardless of your development setup. Check out the [Developing with multiple Workers](/workers/development-testing/multi-workers) guide to learn more about the different approaches and when to use each one.

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