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Why am I receiving a missing module error when building my Node.js app on App Platform ?
Validated on 19 Apr 2023 • Last edited on 2 Jul 2024
App Platform throws this error when a module required to run the app is missing from the dependencies
section of the app’s package.json
file. The error usually looks like this:
Error: Cannot find module 'exampleModule'
[2022-11-01 00:59:32] Require stack:
[2022-11-01 00:59:32] - /workspace/server.js
[2022-11-01 00:59:32] at Function.Module._resolveFilename (node:internal/modules/cjs/loader:985:15)
[2022-11-01 00:59:32] at Function.Module._load (node:internal/modules/cjs/loader:833:27)
[2022-11-01 00:59:32] at Module.require
:
:
(node:internal/modules/cjs/loader:868:12)
[2022-11-01 00:59:32] at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:81:12) {
[2022-11-01 00:59:32] code: 'MODULE_NOT_FOUND',
Sometimes developers mistakenly list the missing module in the devDependencies
section of the package.json
file instead of the dependencies
section. The devDependencies
section’s purpose is to list modules that are required to develop the app, such as linters and testing libraries. App Platform prunes the modules listed in the devDependencies
section during the build process as they are not required to run the app. This process removes any modules that may have been erroneously listed in the devDependencies
section.
To fix this problem, add the missing module to the dependencies
section of your app’s package.json
file. Alternatively, you can configure App Platform to skip the pruning process during deployment by setting one of the following environment variables:
- For npm:
NPM_CONFIG_PRODUCTION=false
- For Yarn:
YARN_PRODUCTION=false
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