Invalid object type for field creator: the ImageObject ...

The Mega Analyzer's Schema tab has a row that reads creator is a typed object, not a bare string, and it only appears when the page carries at least one ImageObject in its JSON-LD. What it is really measuring is whether your image markup names the photographer as an entity Google can type (a Person or an Organization) or as a label with no type at all. The difference is one pair of braces, and Search Console reports the wrong version as "Invalid object type for field creator" in its Image metadata report.

What the check actually tests

The row lives in a sub-section of the Schema tab headed Image Metadata, the Google Search Console field audit. The section renders only when the analyzer's JSON-LD walker finds at least one node whose @type includes ImageObject. The walker recurses into every object value, not just @graph, so an ImageObject nested inside Article.image, WebPage.primaryImageOfPage, or Organization.logo counts, and so does a multi-type node such as ["ImageObject", "Photograph"]. A page whose image field is a plain URL string has no ImageObject node, and the whole section stays hidden.

Once it renders, the section has five rows. Four are info-level and marked optional: copyrightNotice, license, acquireLicensePage, and creditText. Each fires when any ImageObject on the page lacks that field, each carries an add-this-field detail line, and each is tied to Google's Licensable badge. None of them can turn the page red.

The fifth row is the pass/fail one. The detector collects every ImageObject and asks a single question: does any of them have a creator that is a non-empty string? If none does, the row passes under the title creator is a typed object, not a bare string. If one does, the same title renders as a red FAIL with this detail: GSC flags "Invalid object type for field creator". Replace "creator":"Your Name" with {"@type":"Person","name":"Your Name"}.

Be exact about what does not trip it. An ImageObject with no creator at all passes, because the condition requires the field to be present, truthy, and a string; an empty string is falsy and slips through too. Any object value passes, including a bare {"@id": "..."} reference with no @type (more on why that still needs work below). An array of strings, such as "creator": ["Jane Doe"], also passes, because an array is an object to the type check; that is a gap in the detector, not a blessing on the pattern, because each string inside the array is still the wrong type for the field. The walker reads JSON-LD only, so microdata or RDFa image markup is invisible to this row.

Why it matters

Start with the vocabulary. Schema.org defines creator on CreativeWork with expected values of Organization or Person, and notes that it is the same as author for a CreativeWork. ImageObject inherits it through MediaObject and CreativeWork. Schema.org itself is lenient about this. Its data model page admits that where a Person or Organization is expected, publishers will often supply a text string, and that search engines "will often accept this markup and do the best we can." So the vocabulary alone would not fail you. Google's image metadata feature is stricter, and that is where the string becomes an error.

Google's documentation for that feature lists contentUrl as required, plus at least one of creator, creditText, copyrightNotice, or license. The recommended set is acquireLicensePage, creator (Organization or Person), creator.name, creditText, copyrightNotice, and license. Google says providing licensing information "can make the image eligible for the Licensable badge, which provides a link to the license and more detail on how someone can use the image." That badge, and the licensing details in the Google Images viewer, are the visible payoff for these fields.

Search Console validates each ImageObject against that list and reports problems in its Image metadata report, one of the rich result report types it lists. Google's structured data error list defines "Invalid object type for field" as "Wrong structured data object type for the specified property," a different class of issue from a missing field. Google does not publish how one invalid field affects the rest of the node, so I will not claim the badge is guaranteed lost. The conservative reading is that a creator Google cannot type counts for nothing toward the one-of-four requirement, and that the ImageObject is at risk of being ineligible even with the other four rights fields complete.

There is a second reason that has nothing to do with badges. A typed creator can be the same entity as your site's Person or Organization node. If the photographer is you, "creator": {"@id": "https://example.com/#person"} binds every hero image to the node your ProfilePage, your Article authors, and your Organization's founder already point at. That shared @id is how JSON-LD links nodes: the spec defines a node reference as an object containing only @id that points at a node found elsewhere in the document, so any consumer that builds the graph can connect the picture to the entity that owns the site. A string cannot participate in that join, because there is no node to merge into. If you read the ProfilePage.mainEntity post on this site, this is the same class of bug in ImageObject clothing: valid JSON, wrong type, and nothing in your build complains.

Google also reads the same rights information from IPTC photo metadata embedded in the image file: Creator maps to creator, Credit Line to creditText, Copyright Notice to copyrightNotice, Licensor URL to acquireLicensePage, and Web Statement of Rights to license. When both exist and conflict, Google says it will use the structured data. So the JSON-LD value is what counts when the two disagree; a careful IPTC Creator field in the file does not rescue a bad creator in the markup.

How to fix it

Step 1: find every ImageObject on the page and look at its creator. Paste this into the DevTools console on the live page:

const nodes = [];
const walk = n => {
  if (!n || typeof n !== 'object') return;
  if (Array.isArray(n)) { n.forEach(walk); return; }
  const t = [].concat(n['@type'] || []).join(',');
  if (/\bImageObject\b/.test(t)) nodes.push(n);
  Object.values(n).forEach(walk);
};
document.querySelectorAll('script[type="application/ld+json"]').forEach(s => {
  try { walk(JSON.parse(s.textContent)); } catch (e) {}
});
console.table(nodes.map(n => ({
  contentUrl: n.contentUrl || n.url,
  creatorType: typeof n.creator,
  creator: JSON.stringify(n.creator)
})));

Any row where creatorType is string is what the analyzer and Search Console are flagging. Rows where it is undefined are fine as far as this check goes.

Step 2: replace the string with a typed object. The complete block, in the shape the analyzer's detail line points you toward:

{
  "@type": "ImageObject",
  "contentUrl": "https://example.com/img/hero.jpg",
  "license": "https://example.com/licensing/",
  "acquireLicensePage": "https://example.com/licensing/",
  "creditText": "Photo by Jane Doe",
  "copyrightNotice": "© 2026 Jane Doe",
  "creator": {
    "@type": "Person",
    "name": "Jane Doe",
    "url": "https://example.com/about/"
  }
}

Keep creditText as the human-readable string. It is a Text property, and "Photo by Jane Doe" is exactly what Google wants there. creator is the entity, creditText is the caption. This is the part people get wrong on the second pass: they fix creator, then turn creditText into an object for symmetry, and now they have a fresh type error on a field that was fine.

Step 3 (optional, and better on a site with a defined identity node): reference the canonical node instead of repeating the Person on every image. This works when the page defines that node inline with a @type:

{
  "@context": "https://schema.org",
  "@graph": [
    {
      "@type": "Person",
      "@id": "https://example.com/#person",
      "name": "Jane Doe",
      "url": "https://example.com/about/"
    },
    {
      "@type": "ImageObject",
      "@id": "https://example.com/post/#hero",
      "contentUrl": "https://example.com/img/hero.jpg",
      "license": "https://example.com/licensing/",
      "acquireLicensePage": "https://example.com/licensing/",
      "creditText": "Photo by Jane Doe",
      "copyrightNotice": "© 2026 Jane Doe",
      "creator": {"@id": "https://example.com/#person"}
    }
  ]
}

The analyzer passes either form. Search Console, though, evaluates the page it was given. The JSON-LD spec scopes a node reference to a node "found elsewhere in the document," and nothing in Google's documentation says it will fetch your homepage to resolve one. If the #person node is defined on your homepage and only referenced here, you are back in the mainEntity problem. Either define the node inline in the same @graph as above, or put "@type": "Person" and "name" alongside the @id on the reference. When the photographer is a studio or an agency, use "@type": "Organization"; both are expected types.

Step 4: fix it once, at the template level. On a static-site generator the ImageObject usually comes from a post hero partial; change the partial and every post inherits the shape on the next build. On WordPress, check whether your SEO plugin fills creator from a free-text field, because a free-text field almost always becomes a bare string in the output. On a CMS with per-image metadata, map the photographer field into the Person object, not into a creator string.

For a site whose pages already carry the wrong shape, generate the corrected @graph with Schema Fix Bundle. It emits the Organization, WebSite, and Person identity nodes with stable @id values (#organization on the home URL, #author on the page URL), so your ImageObject nodes have a canonical target to reference, and it includes an AI fill prompt for the per-page values. Validate the output in Google's Rich Results Test. Then run Image Licensing + Credit Audit on the page; it matches each img to an ImageObject by contentUrl (falling back to url) and shows which ones carry creditText and license, which catches the schema block that got attached to the wrong image URL. Finish with a fresh Mega Analyzer run and watch the creator row go green.

Step 5: if the image files carry IPTC Creator and Credit Line fields, keep them consistent with the JSON-LD. The structured data is what Google uses when they disagree, but a mismatch is a maintenance trap the next time someone edits one side and not the other.

When to leave it alone

Absent is a pass, and sometimes absent is correct. If you bought or downloaded a stock image whose license does not require attribution and you do not know who shot it, do not invent a creator. Put the source in creditText if the license asks for a credit line, set license to the license URL, and leave creator off.

Do not add ImageObject nodes just to make this section render. The four rights fields are info-level for a reason: a brochure site for a plumbing company that never intends to license its photos does not need acquireLicensePage, and pointing it at the homepage to silence an info row is marking up a licensing page that does not exist. Google's structured data policies ask for markup that reflects the page truthfully, and a fake licensing URL fails that test.

Your logo as Organization.logo is an ImageObject and will make the section appear. A logo has no photographer in the usual sense; leaving creator off it is correct, and the info rows about the logo's copyright and license can be ignored unless you actually license the mark.

Finally, if your ImageObject already uses {"@id": "..."} for creator and the referenced node is defined inline on the same page with a @type, the analyzer's pass is a real pass. Do not expand it into a duplicate inline Person on every image. One definition, many references is the whole point of @id.

Fact-check notes and sources

Source: https://developers.google.com/search/docs/appearance/structured-data/image-license-metadata establishes the required properties (contentUrl plus one of creator, creditText, copyrightNotice, license), the recommended set with creator as Organization or Person and creator.name as Text, the Licensable badge sentence quoted above, the IPTC field mapping, and the sentence that Google "will use the structured data information" when the two conflict.
Source: https://support.google.com/webmasters/answer/13300873 is Google's structured data error list; it defines Invalid object type for field "property name" as "Wrong structured data object type for the specified property. Refer to documentation to find and use the data type expected for this property."
Source: https://support.google.com/webmasters/answer/7552505 lists Image metadata among the rich result report types Search Console publishes.
Source: https://schema.org/creator establishes the expected types Organization or Person and that creator is the same as author for a CreativeWork.
Source: https://schema.org/docs/datamodel.html is the schema.org data model page; its conformance section says that where a Person, Place, or Organization is expected "we will get a text string" and that search engines "will often accept this markup and do the best we can." That is why the string is a Google error, not a schema.org one.
Source: https://schema.org/ImageObject establishes that ImageObject inherits creator, creditText, copyrightNotice, license, and acquireLicensePage from CreativeWork and contentUrl from MediaObject.
Source: https://www.w3.org/TR/json-ld11/#node-identifiers defines a node reference as "a node object containing only the @id property, which may represent a reference to a node object found elsewhere in the document."
Source: https://developers.google.com/search/docs/appearance/structured-data/sd-policies establishes that image URLs in structured data must be crawlable and indexable, that you should not mark up content that is not visible to readers of the page, and that a structured data manual action removes rich result eligibility without affecting web search ranking.
Source: https://iptc.org/standards/photo-metadata/ establishes the IPTC Photo Metadata Standard (Core and Extension) as the embedded-metadata schema photo software writes into the file; the field mapping above is Google's, from the first source.

Invalid object type for field creator: the ImageObject fields Search Console checks