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vercel__next.js/errors/next-image-missing-loader-width.mdx
Delba de Oliveira 3bf570d84d Docs IA 2.0: Images (#78769)
Closes:
- https://linear.app/vercel/issue/DOC-4626/images
- https://linear.app/vercel/issue/DOC-4610/split-image-and-font-pages

Redirects: https://github.com/vercel/next.js/pull/78769

**Housekeeping:** 
- Deletes BYA images page
- Creates relevant getting started docs in `/pages`
- Splits "Images and Fonts" into "Images" and "Fonts" pages to allow us
to add more context to each page in the future

**API reference**: 
- Improves image API reference to follow more of a consistent format and
language
- Adds examples

**Follow-up:** https://github.com/vercel/next.js/pull/78857
- Create a Deep Dive Guide on how image optimization works

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Co-authored-by: Rich Haines <hello@richardhaines.dev>
2025-05-08 13:11:38 +01:00

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---
title: 'Missing `width` in the URL Returned by the Loader Prop on `next/image`'
---
## Why This Error Occurred
The [`loader`](/docs/pages/api-reference/components/image#loader) prop on the `next/image` component allows you to override the built-in URL resolution with a custom implementation in order to support any 3rd party cloud provider that can perform Image Optimization.
This error occurred because the provided `loader()` function did not use `width` in the returned URL string. This means that the image will likely not be resized and therefore degrade performance.
## Possible Ways to Fix It
- Ensure your Image Optimization provider can resize images. Then use the `width` parameter from the [`loader()`](/docs/pages/api-reference/components/image#loader) function to construct the correct URL string.
- Add the [`unoptimized`](/docs/pages/api-reference/components/image#unoptimized) prop.
## Useful Links
- [Image Optimization Documentation](/docs/pages/api-reference/components/image)
- [`next/image` Documentation](/docs/pages/api-reference/components/image)