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Use a namespace import, call the function only after the Ionic view has mounted in a browser, and verify the package that your lockfile actually resolves. In most Ionic React projects, domtoimage.toPng is undefined because the import shape does not match the package export—not because the element contains a difficult image. Once the method exists, handle rendering failures such as CORS, fonts, or unloaded images as a separate problem.
What the error means
The dom-to-image API exposes top-level functions that accept a DOM node and return promises fulfilled with data URLs. The expected call is:
const dataUrl = await domtoimage.toPng(node);If JavaScript reports that toPng is undefined, first inspect domtoimage itself. You may have imported a default value when the bundler provided a module namespace, loaded a different copy of the package, or executed code before a browser DOM existed. Do not start by changing CSS or image URLs; those issues normally produce a rejected promise after toPng has been found.
1. Install and verify the dependency
Install the package in the Ionic project
From the directory containing your Ionic React package.json, run:
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npm install dom-to-imageConfirm that both package.json and the lockfile name the package you intend to use. Check for duplicate, aliased, or transitive copies when a monorepo or workspace is involved. npm currently lists the original package as version 2.6.0 and says it was last published about nine years ago. That age makes stale lockfiles and multiple resolved copies especially plausible.
Inspect what your application receives
Temporarily log the imported value in a browser-only path:
console.log('dom-to-image export:', domtoimage);
console.log('toPng type:', typeof domtoimage.toPng);You need to see a function for the second log. If the import object is wrapped (for example, under a default property), do not guess which property to use across every build. Try the namespace import below, then rebuild and inspect the result. Also remove an accidental duplicate dependency and regenerate the lockfile only when you understand which package entry is being changed.
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2. Use the import shape that works in Ionic React
Preferred ES-module form
In an Ionic React component, import the module namespace:
import * as domtoimage from 'dom-to-image';Then call domtoimage.toPng(node). An Ionic community integration reports this namespace form as the working pattern. A default import such as import domtoimage from 'dom-to-image' can produce a value whose toPng property is absent, depending on the TypeScript and bundler interop settings.
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CommonJS projects
If your toolchain is CommonJS-compatible, the project README documents:
const domtoimage = require('dom-to-image');Do not mix require, a default import, and namespace access without checking the actual runtime object. The correct choice is the one that leaves typeof domtoimage.toPng equal to 'function' in the built application.
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Why timing matters
dom-to-image needs a real browser DOM. Do not call it at module scope, during server rendering, or while the first render is still constructing the target. In Ionic, routed views and WebView content can mount after the component function initially runs. Obtain the node from a ref or an ID inside an event handler or a client-side effect.
A maintained fork, dom-to-image-more, explicitly recommends a typeof window !== 'undefined' guard or a client-only dynamic import and rejects render calls made without a browser DOM. The same lifecycle discipline prevents the original package from being invoked too early.
Minimal Ionic React component
import { useRef } from 'react';
import * as domtoimage from 'dom-to-image';
export function CaptureCard() {
const cardRef = useRef<HTMLDivElement>(null);
async function savePng() {
const node = cardRef.current;
if (!node || typeof window === 'undefined') return;
try {
const dataUrl = await domtoimage.toPng(node);
const link = document.createElement('a');
link.download = 'card.png';
link.href = dataUrl;
link.click();
} catch (error) {
console.error('DOM capture failed', error);
}
}
return (
<>
<div ref={cardRef}>Capture me</div>
<button type="button" onClick={savePng}>Save PNG</button>
</>
);
}The ref is null until the target has rendered. The click handler therefore runs at the right time, and the guard prevents a server-side invocation. If your target is selected by ID instead, check the result explicitly:
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const node = document.getElementById('capture');
if (!node) throw new Error('Capture target not mounted');
const dataUrl = await domtoimage.toPng(node);4. Separate an undefined method from a failed render
When toPng is undefined
- Change a failing default import to
import * as domtoimage from 'dom-to-image'. - Check that the resolved package is really
dom-to-image, not an alias or a second copy. - Verify the built browser bundle, not only a development-only import.
- Ensure the call is not happening in server-rendered or pre-mount code.
When toPng exists but the promise rejects
That is a rendering or resource problem. Cross-origin images, web fonts, external stylesheets, SVG resources, and tainted canvases can all affect the result. Make sure images have finished loading before capture and keep the try/catch around the promise. The original README notes that failed images can throw unless an imagePlaceholder is supplied. A placeholder can keep an unavailable image from aborting the entire export, but it does not fix missing CORS permission.
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5. Decide whether to stay on the original package
| Consideration | dom-to-image |
dom-to-image-more |
|---|---|---|
| Import and call | Namespace import and domtoimage.toPng(node) are the documented shape. |
Documents the same call, so the application-level API is familiar. |
| Maintenance | npm lists version 2.6.0 and a publication roughly nine years ago. | Maintained fork with current documentation focused on browser resources and SSR. |
| Resource diagnostics | README discusses failed images and an imagePlaceholder option. |
Documents resource interception, image-error reporting, font and stylesheet handling. |
| Runtime target | Requires a browser DOM for capture. | Also requires a browser DOM and documents guards or client-only loading for SSR. |
Migrate as a compatibility test rather than a blind replacement. Update the import, capture a representative card in a real browser and Ionic WebView, and compare fonts, SVG, external images, and layout. Keep the original package if its output is correct and its age is acceptable for your maintenance policy; choose the fork when its diagnostics or resource handling address a problem you actually have.
6. Troubleshooting checklist
Symptom: “Cannot read properties of undefined (reading ‘toPng’)”
Cause: The imported value is not the module namespace expected by the package. Fix: switch to the namespace import, rebuild, and log the export object and typeof domtoimage.toPng.
Symptom: toPng is not a function after changing imports
Cause: A different package copy, alias, or interop wrapper is being bundled. Fix: inspect package.json and the lockfile, remove unintended duplicates, and use the CommonJS form only when the project actually uses CommonJS.
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Symptom: The ref is null
Cause: Capture runs before the Ionic view mounts or after it has unmounted during navigation. Fix: invoke capture from a user action or a client-side effect after rendering, and return early when ref.current is null.
Symptom: SSR or build-time error mentioning window or document
Cause: Browser-only code executed on the server or during module evaluation. Fix: move the import or call into client-only code, guard with typeof window !== 'undefined', and never capture during server rendering.
Symptom: Export rejects, is blank, or misses images
Cause: The method exists, but a resource failed, is cross-origin, or was not loaded. Fix: wait for images and fonts, verify CORS and stylesheet availability, inspect the caught error, and use an image placeholder where the library supports it.
Symptom: It works on desktop but not in an Ionic WebView
Cause: WebViews can differ in font availability, SVG support, network permissions, and timing. Fix: test the actual device runtime, use assets the WebView can fetch, and capture only after the view and its resources are ready.
Performance, reliability and cost considerations
A DOM-to-image export runs in the user’s browser and can consume memory proportional to the target’s size and its rasterized resources. Keep capture regions bounded when a full page is unnecessary, avoid triggering several captures at once, and release references when a routed view unmounts. Large, font-heavy cards and pages with many external images are more likely to expose timing or resource failures than a simple same-origin component.
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For reproducible server-side captures, move the job out of the WebView instead of trying to make SSR render a browser-only library. ScreenshotNeo is a website screenshot API and MCP server for developers; it returns PNG, JPEG, WebP, or PDF from one request. It is not a drop-in replacement for a local DOM node, but it is useful when the input is a reachable URL rather than an in-memory React component.
Or skip the browser setup
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See the ScreenshotNeo API documentation for the complete option set. A direct request looks like this:
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import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)And in Node.js:
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FAQ
Can I use the same component with a maintained fork?
Usually the application call remains domtoimage.toPng(node), but treat the change as a compatibility test and verify fonts, SVG, external images, and the Ionic WebView before shipping.
Will a server screenshot service capture an unsaved React state?
No. A URL-based service sees the page it can load over the network; it cannot see a component that exists only in a user’s in-memory state. Use the local DOM approach for that case, or expose the state through a URL before requesting a server capture.
Frequently Asked Questions
Can I use the same component with a maintained fork?
Usually the application call remains domtoimage.toPng(node), but treat the change as a compatibility test and verify fonts, SVG, external images, and the Ionic WebView before shipping.
Will a server screenshot service capture an unsaved React state?
No. A URL-based service sees the page it can load over the network; it cannot see a component that exists only in a user’s in-memory state. Use the local DOM approach for that case, or expose the state through a URL before requesting a server capture.
Quick Recap
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