Exactly the same issue here.

Hi ​@berszi and ​@VinnieH,

Before we dig deeper into this, would you mind sharing a detailed screenshot of how your Zap is configured? This will help me take a closer look at the issue.

Please don't include personal information in the screenshot, or be sure blur out any personal information.

Thanks!

​@ken.a 

My scheme is saved here: https://gist.githubusercontent.com/VinnieLendscape/b960f94ed63869046bc68efeb5d5f703/raw/cd3ea1172ed75e5e65f5ed0b71ab4887305b8ec3/FinanceCompanyProfile.json

The error message:

If i select ‘text’ as the response format it works, so I know it works without json. I dont understand why it cannot get the JSON schema?

Hi ​@VinnieH,

If you're experiencing an issue fetching the JSON schema from a URL in your Zapier integration. First, verify that the URL is correct and accessible, and check for CORS restrictions that might block Zapier from retrieving the file. Ensure the server returns the correct Content-Type (application/json) and properly format the JSON using a validator tool. Double-check Zapier's configuration to confirm it's expecting a JSON schema. Lastly, network issues could be causing the problem, so retrying after some time may help.

Feel free to reach out if you have any questions or need further assistance.

It looks like I’m having the same issue as berszi and VinnieH. Checked and server returns “application/json” (screenshot attached). Tried hosting at both github and netlify, but getting the same error message.

Hi friends,

This might be a possible bug with ChatGPT and needed attention with our Zapier support team to report it directly to OpenAI. Kindly contact our Zapier support team on this link. https://zapier.com/app/get-help and choose report a bug.

Hi All - having the same problem trying to pass a schema URL into the responses API. Here’s my URL for reference: https://raw.githubusercontent.com/chris-permitable/json-schemas/refs/heads/main/prop_info.json

I tested via curl and validated the json was findable and readable.

Been tearing out my hair reading documentation with OpenAI, but Zapier is fairly silent on specs.

Going to submit a support ticket - leaning towards this being a bug

Let me know if y’all find anything out

Hi friends,

 

This might be a possible bug with ChatGPT and needed attention with our Zapier support team to report it directly to OpenAI. Kindly contact our Zapier support team on this link. https://zapier.com/app/get-help and choose report a bug.

 

 

​@JammerS I opened a trouble ticket for this issue. Is anyone else successfully using the JSON Schema? Since it such a new feature in Zapier, I’d love to connect with other users and see how they are making it work.

Hi ​@chris-protos,

Review the official documentation for guidance on exploring Zapier's JSON Schema feature and troubleshooting issues. Sharing your specific use case with the community may help uncover targeted solutions and best practices.

Our Zapier support team will provide you with specific guidance. In the meantime, gathering insights from other users can be beneficial.

Hi folks,

This has been resolved, with the request for fetching the JSON schema from a URL no longer erroring. Using that action with a publicly accessible link should work as expected now

Really?

Please share an example of a valid publicly accessible link. Still broken for me when I use a raw public gist link and raw github link for a repo that has the JSON schema. When I saw “raw” I mean just like the links given in this thread from other users.

Were those links tested by the dev team? feels like something was missed here..

Hi ​@Terrell,

Thank you for reporting the issue with publicly accessible JSON schema links. To troubleshoot, first, ensure the links are truly public by testing them in an incognito window. Confirm the format is correct, especially for raw GitHub links, and validate the JSON schema's structure using an online tool. Try substituting a known working link to isolate the problem. Please share example links (without sensitive data) to help diagnose the problem more effectively.

If you have any more questions or need further assistance, feel free to ask. We're here to help.

The error you're encountering — “Failed to fetch JSON schema from the provided URL” — when using Zapier with ChatGPT's structured output usually stems from URL formatting, content type headers, or file accessibility. Let's go step by step:

Your schema file URL:

https://raw.githubusercontent.com/bertalanv/hello-world/refs/heads/master/math.json

Problem:

This URL doesn't actually resolve correctly. The /refs/heads/master/ path is not how you access raw files directly on GitHub.

Corrected URL Format for Raw GitHub Content

You should use:

https://raw.githubusercontent.com/bertalanv/hello-world/master/math.json

Test this in your browser to confirm it's accessible and returns valid JSON.

Double Check These Things:

1. The file is public (which it is, since you’re using GitHub’s raw link).

2. Valid JSON Schema — The file must be a proper JSON Schema, not just any JSON.

3. Content served correctly — GitHub’s raw URL should work, but make sure no extra HTML, errors, or headers are interfering.

4. Zapier-specific requirement — Zapier might expect Content-Type: application/schema+json or application/json. GitHub's raw files usually serve text/plain, which could be the issue.

Workaround Options:

1. Use a JSON hosting service with correct content type headers, like:

• GitHub Gist + raw link

• Pastebin with RAW option

• jsonbin.io

• Mocki.io — great for testing APIs and schemas

2. Host it via a small static site (e.g., Netlify or Vercel) with correct MIME type headers.

Example: Hosting JSON Schema on GitHub Gist

1. Create a new GitHub Gist

2. Paste your JSON schema into it

3. Click "Create secret/public gist"

4. Get the raw URL (click "Raw" on your file)

5. Use that raw URL in Zapier

If you'd like, paste your JSON Schema here and I’ll help validate it or recommend a hosting method that guarantees it works with Zapier.

I can confirm, it’s now working as expected.

Hi ​@VinnieH,

Thank you for confirming that the issue is now resolved. We're glad to hear that everything is working as expected. If you have any further questions or encounter any other problems, please don't hesitate to contact us. We're here to help!

I’m having the same issue. I hav verified my schema is publicly accessible. Here: https://json-schemas-publicos-7412ko4vz-nodulabs-projects.vercel.app/saettone-facturas.json

But no matter what I do the GPT step says the same: Failed to create a conversation in ChatGPT (OpenAI)
Failed to fetch JSON schema from the provided URL

To add on - I used Vercel so I can specify the header type as well from my repo:

https://github.com/nodulab/JSON-schemas-publicos/blob/main/vercel.json

 The error message is a red herring!

Zapier’s “failed to fetch JSON schema” actually covers two different failure points:

So the schema is downloading fine; OpenAI is rejecting it. (OpenAI Community)

2. Root cause: OpenAI doesn’t accept top‑level arrays

OpenAI’s structured‑output (and function‑calling) validator insists that the root of the schema be an object, not an array. If you give it a schema whose top level is "type": "array", the API throws:

Invalid schema … schema must be a JSON Schema of 'type: "object"', got 'type: "array"' (OpenAI Community)

Zapier doesn’t surface that detail, hence the confusing error.

Two clean fixes:

Option A – Wrap the array in an object (OpenAI‑compliant)

{
  "$schema": "https://json-schema.org/draft-07/schema#",
  "title": "EXAMPLE",
  "type": "object",
  "properties": {
    "images": {
      "type": "array",
      "minItems": 3,
      "maxItems": 3,
      "items": ....

Tell the model to return:

{
  "images": < …three objects… ]
}

Option B – Keep the array but ditch Zapier’s schema field
If you really want a bare array, skip the schema URL entirely and:

• Use JSON Mode (response_format: { "type": "json_object" }) and validate the output yourself in a downstream Code step, or

• Ask OpenAI for a string and JSON.parse() it later.

N.B. Hosting still matters 

Gist raw links come back as text/plain; that’s fine for Step A, but if you ever do hit a real “can’t download” issue, use a GitHub‑repo raw URL (raw.githubusercontent.com) or jsDelivr CDN which both serve application/json.

Hi - I’m getting the dreaded error, and the file is reachable, and I’ve tested the schema in the playground.

https://api.jsonbin.io/v3/b/6890f4b7f7e7a370d1f3b948

—-

Failed to create a conversation in ChatGPT (OpenAl)
Failed to fetch JSON schema from the provided URL

—-

Any ideas? ​@JammerS ?

https://raw.githubusercontent.com/bertalanv/hello-world/refs/heads/master/math.json

https://raw.githubusercontent.com/bertalanv/hello-world/master/math.json

https://gist.githubusercontent.com/ecomtony1993-sketch/9a60baffb5c0c3ff2e6f9447125e8730/raw/210777ba3fb4a286ad7bb6f93307452bf5c4a9f4/schema.json

Here’s my raw URL (incognito extracted). I’m still having the same problem.

Here’s mine. I’m getting the same message. 

https://gist.githubusercontent.com/ecomtony1993-sketch/9a60baffb5c0c3ff2e6f9447125e8730/raw/210777ba3fb4a286ad7bb6f93307452bf5c4a9f4/schema.json