Deprecation of C4 endpoint URLs

Deprecation of C4 endpoint URLs

Notes
Note: This post is only for users who are still using the C4 endpoints.
Hello everyone,
 
At Zoho Creator, we're committed to continuously enhancing the security, performance, and capabilities of our platform. As part of this ongoing effort, we'll be deprecating older C4 endpoint URLs in the next few months. This transition is critical for security, as the old endpoints rely on outdated libraries, leaving it potentially vulnerable to security issues. We believe this update is a crucial step towards making the platform more secure and unified. With this post we aim to guide you through the migration process.
 
What are C4 endpoint URLs?   
These are a legacy URL pattern that were a part of the C4 version of Zoho Creator and could be used to access data via APIs. Essentially, the C4 endpoints are the one that contains a .do action (such as restapiaction.do, getApps.do and so on). 
 
If you built custom workflows several years ago, they might still be using these URLs. With the launch of our C5 version and REST APIs, we transitioned to a more standardized URL format. However, we continued to support requests made in the older format to prevent service disruptions.
 
What is changing?   
We're phasing out all C4 endpoint URLs in favor of new standardized URL formats which have been in place since 2018. Going forward, all API requests, such as adding, updating, or deleting records, must be performed using the format as per our v2.1 REST APIs. 
 
Use the table below to find examples of new endpoints that corresponds to the legacy C4 endpoint URLs. Please note that all URLs that end with .do in them needs to be replaced.
 
Action
C4 format
New format​
Add Record from Web Client
/addRecordValidate.do
https://creatorapp.zohopublic.<DC>/<ScopeName>/<AppLinkName>/form/<FormLinkName>/clientadd/<PublishKey>
/getApps.do
https://www.zohoapis.com/creator/v2.1/meta/applications
/getallapps.do
https://www.zohoapis.com/creator/v2.1/meta/applications
/getformmeta.do
https://www.zoho.com/creator/help/api/v2.1/get-fields.html
/restapiaction.do
https://www.zohoapis.com/creator/v2.1/data/<ScopeName>/<AppLinkName>/form/<FormLinkName>
-X POST
/restapiaction.do
https://www.zohoapis.com/creator/v2.1/data/<ScopeName>/<AppLinkName>/report/<ReportLinkName>
-X PATCH
/restapiaction.do
https://www.zohoapis.com/creator/v2.1/data/<ScopeName>/<AppLinkName>/report/<ReportLinkName>
-X DELETE
/postrequestadd.do
https://www.zohoapis.com/creator/v2.1/data/<ScopeName>/<AppLinkName>/form/<FormLinkName>
-X POST
/showXml.do
https://www.zohoapis.com/creator/v2.1/data/<ScopeName>/<AppLinkName>/report/<ReportLinkName>
-X GET
 
What should you do?   
To prevent any disruption to your applications, you'll need to update your scripts that use these old C4 endpoint URLs.
 
Your action plan should be:
  1. Identify: Review your existing workflows and third-party services for any code that calls C4 endpoints.
  2. Update: Make necessary changes to your scripts to make sure they align with the new standardized format.
  3. Test: Thoroughly test your updated scripts to ensure they function as expected. 
When does this take effect? 
We plan to fully deprecate C4 endpoints starting November 28, 2025. Please note that, after this date, any API call made to a C4 endpoint will fail.

We request your utmost attention to this matter and encourage you to make the necessary changes before the deadline to avoid any disruption to your workflows.

We're confident these changes will improve the security and performance of your integrations. We look forward to your cooperation in ensuring a smooth and successful migration.

If you need any assistance or have questions, please feel free to reach out to us; we're always here to help.

Regards,
The Zoho Creator team

    • Sticky Posts

    • Introducing Zoho Creator's 2025 Release Projection 2

      Hello Creators! I'm Prakash, from the Creator product management team, and today I'm delighted to unveil our next set of features as part of Release Projection 2 for 2025. With thoughtful analysis and planning, we've curated powerful new capabilities

    • Zoho Creator - 2023 Release Projection 1

      Hello everyone! A very Happy New Year to you and your family. Hope you're all good and having a great time using Zoho Creator to make your lives easier and your businesses prosper. 2022 was an action-packed year for us at Creator, and we hope to continue

    • Zoho Creator User Group meetups in a city near you! - Oct - Nov, 2023

      Greetings from the Zoho Creator team! We're hosting a series of Zoho Creator meetups in various cities across the globe, and we'd love to meet you there! Our meetups are a great opportunity to network with industry peers, exchange ideas and best practices,

    • Zoho Creator - 2023 Release Projection 2

      Hello everyone! Time truly flies when you're having an incredible journey, and today we mark the completion of an eventful and action-packed six months. It feels like just yesterday when we embarked on this adventure together with the launch of our new

    • Upcoming Updates - August 2022

      Hi all, Greetings from the Zoho Creator team! Today we've got news for you on some exciting updates. And rest assured— there’s more to come! In this post, we'll be going over the upcoming features and improvements for this month as mentioned below. A

    • Recent Topics

    • Wrapping up 2025 on a high note: CRM Release Highlights of the year

      Dear Customers, 2025 was an eventful year for us at Zoho CRM. We’ve had releases of all sizes and impact, and we are excited to look back, break it down, and rediscover them with you! Before we rewind—we’d like to take a minute and sincerely thank you

    • Passing the CRM

      Hi, I am hoping someone can help. I have a zoho form that has a CRM lookup field. I was hoping to send this to my publicly to clients via a text message and the form then attaches the signed form back to the custom module. This work absolutely fine when

    • Where can we specify custom CSS in Zoho Forms custom theme ?

      I'm using a form with a dark theme. The OTP popup window is unreadable, because for some reason, the OTP popup background fixes color to white, but still takes the font color specified in the custom theme. This ends up as white on white for me, rendering

    • Automating Employee Birthday Notifications in Zoho Cliq

      Have you ever missed a birthday and felt like the office Grinch? Fear not, the Cliq Developer Platform has got your back! With Zoho Cliq's Schedulers, you can be the office party-cipant who never forgets a single cake, balloon, or awkward rendition of

    • Drop Down Value

      Hi, May I know why Zoho Flow treat this drop down as number and not as string. If so, how can I fetch the right value for filtering. This field is from Creator, in Creator upon checking by default it is a string since it's not a lookup field.

    • Create PO from an invoice

      We are a hardware and software sales company which receives orders over the internet. We drop ship most of our products from a warehouse outside of our company. Our orders get sync'd into Zoho from our store via onesaas as invoices. It would be great

    • SMS to customers from within Bigin

      Hi All, Is there anyone else crying out for Bigin SMS capability to send an SMS to customers directly from the Bigin interface? We have inbuilt telephony already with call recordings which works well. What's lacking is the ability to send and receive

    • Zoho Survey reminder settings are extremely confusing

      Hi, I just want to set 3 reminders, one week apart from the first email out. Your form is too confusing and I don't understand. Can you simplify and be more specific regarding the language used on the form ?

    • Add deluge function to shorten URLs

      Zoho Social contains a nice feature to shorten URLs using zurl.co. It would be really helpful to have similar functionality in a Deluge call please, either as an inbuilt function or a standard integration. My Creator app sends an email with a personalised

    • Add specific field value to URL

      Hi Everyone. I have the following code which is set to run from a subform when the user selects a value from a lookup field "Plant_Key" the URL opens a report but i want the report to be filtered on the matching field/value. so in the report there is

    • form data load issue when saving as duplicate record is made

      Hello. I have a form with a lookup when a value is selected the data from the corresponding record is filled into all of the fields in the form. But the form is loaded in such a state that if any value is changed it will take all of the values pre loaded

    • Unable to remove the “Automatically Assigned” territory from existing records

      Hello Zoho Community Team, We are currently using Territory Management in Zoho CRM and have encountered an issue with automatically assigned territories on Account records. Once any account is created the territory is assigned automatically, the Automatically

    • Track online, in-office, and client location meetings separately with the new meeting venue option

      Hello everyone! We’re excited to announce meeting enhancements in Zoho CRM that bring more clarity and structure to how meetings are categorized. You can now specify the meeting venue to clearly indicate whether a meeting is being held online, at the

    • Google Fonts Integration in Pagesense Popup Editor

      Hello Zoho Pagesense Team, We hope you're doing well. We’d like to submit a feature request to enhance Zoho Pagesense’s popup editor with Google Fonts support. Current Limitation: Currently, Pagesense offers a limited set of default fonts. Google Fonts

    • Improved Contact Sync flow in Google Integration with Zoho CRM

      Hello Everyone, Your contact sync in Google integration just got revamped! We have redesigned the sync process to give users more control over what data flows into Google and ensure that this data flows effortlessly between Zoho CRM and Google. With this

    • CRM Canvas - Upload Attachments

      I am in the process of changing my screens to Canvas.  On one screen, I have tabs with related lists, one of which is attachments.  There doesn't appear to be a way to upload documents though.  Am I missing something really obvious?  Does anyone have

    • Pro Lite Upgrade - Quick Access Tray

      Hello, I was going to upgrade to Pro Lite but the Quick Access Tray feature isn't available for Windows. Of the four features not available for Windows, the QAT is what I'm most interested in. Are there plans to add this feature for Windows anytime soon?

    • Custom Fonts in Zoho CRM Template Builder

      Hi, I am currently creating a new template for our quotes using the Zoho CRM template builder. However, I noticed that there is no option to add custom fonts to the template builder. It would greatly enhance the flexibility and branding capabilities if

    • Improved Functionality PO Bill SO Invoice

      Hello, I need to enter over 100 items, it's frustrating to scroll a few item rows and wait for more to load, then scroll again. It would be nice to have buttons that scroll to the top or bottom with one click. Furthermore, these items I'm adding are VAT

    • Wishes for 2026

      Hello, and a happy new year 2026! Let's hope it's better for everyone. I'd like to share some thoughts on Zoho One and what could be useful in the short, medium, and long term. Some things are already there, but not applied to Zoho One. Others seem like

    • How to Integrate Zoho Books with Xero (No Native Connection Available)

      Hi everyone, I’m currently facing an issue with integrating Zoho Books invoices with Xero, as I’ve noticed Zoho does not provide a native integration with Xero at this time. I would like to ask: What are the common or recommended solutions for syncing

    • How to install Widget in inventory module

      Hi， I am trying to install a app into Sales Order Module related list, however there is no button allow me to do that. May I ask how to install widget to inventory module related list?

    • Picklist field shows "none" as default

      Hello, Is there an option to avoid showing "none" as the default value in a picklist field? I also don't want to see any option displayed. My expectation is to have a blank bar, and then when I display the drop-down list, I can choose whichever I wa

    • error while listing mails

      I can't access email in any of my folders: Oops, an error occurred - retry produces the second error response: error while listing mails (cannot parse null string). I've signed in and out of Zoho, restarted my iMac.

    • Unlocking New Levels: Zoho Payroll's Journey in 2025

      Every year brings its own set of challenges and opportunities to rethink how payroll works across regulations and teams. In 2025, Zoho Payroll continued to evolve with one clear focus: giving businesses more flexibility, clarity, and control as they grow.

    • Introducing Connected Records to bring business context to every aspect of your work in Zoho CRM for Everyone

      Hello Everyone, We are excited to unveil phase one of a powerful enhancement to CRM for Everyone - Connected Records, available only in CRM's Nextgen UI. With CRM for Everyone, businesses can onboard all customer-facing teams onto the CRM platform to

    • Send Supervisor Rule Emails Within Ticket Context in Zoho Desk

      Dear Zoho Desk Team, I hope this message finds you well. Currently, emails sent via Supervisor Rules in Zoho Desk are sent outside of the ticket context. As a result, if a client replies to such emails, their response creates a new ticket instead of appending

    • CRM project association via deluge

      I have created a workflow in my Zoho CRM for closing a deal. Part of this workflow leverages a deluge script to create a project for our delivery team. Creating the project works great however, after or during the project creation, I would like to associate

    • Zoho Browser??

      hai guys, this sounds awkward but can v get a ZOHO BROWSER same as zoho writer, etc. where i can browse websites @ home and continue browsing the same websites @ my office, as v have the option in Firefox, once i save and close the browser and again when i open it i will be getting the same sites. If u people r not clear with my explanation, plz let me know. Thanks, Sandeep  

    • Sync desktop folders instantly with WorkDrive TrueSync (Beta)

      Keeping your important files backed up and accessible has never been easier! With WorkDrive desktop app (TrueSync), you can now automatically sync specific desktop folders to WorkDrive Web, ensuring seamless, real-time updates across devices. Important:

    • MCP no longer works with Claude

      Anyone else notice Zoho MCP no longer works with Claude? I'm unable to turn this on in the claude chat. When I try to toggle it on, it just does nothing at all. I've tried in incognito, new browsers, etc. - nothing seems to work.

    • Enable History Tracking for Picklist Values Not Available

      When I create a custom picklist field in Deals, the "Enable History Tracking for Picklist Values" option is not available in the Edit Properties area of the picklist. When I create a picklist in any other Module, that option is available. Is there a specific reason why this isn't available for fields in the Deals Module?

    • The reason I switched away from Zoho Notebook

      My main reason for switching to Zoho was driven by three core principles: moving away from US-based products, keeping my data within India as much as possible, and supporting Indian companies. With that intent, I’ve been actively de-Googling my digital

    • Add RTL and Hebrew Support for Candidate Portal (and Other Zoho Recruit Portals)

      Dear Zoho Recruit Team, I hope you're doing well. We would like to request the ability to set the Candidate Portal to be Right-to-Left (RTL) and in Hebrew, similar to the existing functionality for the Career Site. Currently, when we set the Career Site

    • Ability to Edit YouTube Video Title, Description & Thumbnail After Publishing

      Hi Zoho Social Team, How are you? We would like to request an enhancement to Zoho Social that enables users to edit YouTube video details after the video has already been published. Your team confirmed that while Zoho Social currently allows editing the

    • Free Webinar : Unlock AI driven business insights with Zoho Inventory + Zoho Analytics

      Are you tired of switching between apps and exporting data to build customized reports? Say hello to smarter & streamlined insights! Join us for this exclusive webinar where we explore the power of the Zoho Inventory–Zoho Analytics integration. Learn

    • Critical Issue: Tickets Opened for Zoho Support via the Zoho Help Portal Were Not Processed

      Hi everyone, We want to bring to your attention a serious issue we’ve experienced with the Zoho support Help Portal. For more than a week, tickets submitted directly via the Help Portal were not being handled at all. At the same time no alert was posted

    • Hide/Show Subform Fields On User Input

      Hello, Are there any future updates in Hide/Show Subform Fields "On User Input"?

    • Cloning Item With Images Or The Option With Images

      Hello, when I clone an item, I expect the images to carry over to the cloned item, however this is not the case in Inventory. Please make it possible for the images to get cloned or at least can we get a pop up asking if we want to clone the images as

    • Archiving Contacts

      How do I archive a list of contacts, or individual contacts?

    • Next Page