How to show images in a GatsbyJS project?

Question

How to show images? It can not be shown correctly below.

In the src/components/Header.js file:

<img src="../images/logo.png" style={{width:"112",height:"28"}} />

Answer 1

Importing Assets Directly Into Files

import React from "react"
import logo from "./logo.png" // Tell Webpack this JS file uses this image

console.log(logo) // /logo.84287d09.png

function Header() {
  // Import result is the URL of your image
  return <img src={logo} alt="Logo" />
}

export default Header

The reason this is best is that it enables optimizations through the Webpack bundling pipeline, e.g. compression, data URLs, cache busting filename hashes, etc.

Using the Static folder

This is mostly useful for files other than images.

You can create a folder named static at the root of your project. Every file you put into that folder will be copied into the public folder. E.g. if you add a file named sun.jpg to the static folder, it’ll be copied to public/sun.jpg

You can reference assets from the static folder in your code without anything special required:

render() {
  // Note: this is an escape hatch and should be used sparingly!
  // Normally we recommend using `import` for getting asset URLs
  // as described in the “Importing Assets Directly Into Files” page.
  return <img src={'logo.png'} alt="Logo" />;
}

---

Corey's answer quotes the "Add custom webpack config" section of the Gatsby documentation, which is useful but unnecessary to load images.

Answer 2

Create a gatsby-node.js file at the root of your project if you don't already have one and add this:

const path = require("path")

exports.onCreateWebpackConfig = ({ stage, actions }) => {
  actions.setWebpackConfig({
    resolve: {
      modules: [path.resolve(__dirname, "src"), "node_modules"],
      alias: { react: path.resolve("./node_modules/react") },
    },
  })
}

This does two things:

1. It will make src the base for your imports
2. It will ensure that you don't run into weird bugs due to multiple versions of React getting loaded (plugins that need to reference React can cause this).

In your Header.js file, you can now do this:

import logo from "images/logo.png"

export const Header => 
  <header>
    <img src={logo} alt="Logo Alt Text" />
  </header>

The rendered result of this will actually be different depending on the file size of your logo. If it's small enough, Gatsby will inline it using base64, reducing the number of HTTP requests required to load your page. If it's larger, it will be given an asset fingerprint and added to the assets available when your site is built and the URL to the file will be used for the src attribute (e.g. /images/logo-123asd.png). This will allow you to use HTTP cache headers that tell the browser it's safe to cache this file for a long time; if it changes, the URL will change and you don't need to worry about invalidating the cached version.