Kaizen #177: Duplicate Check Preferences API vs. Upsert API

Kaizen #177: Duplicate Check Preferences API vs. Upsert API

Hello all!!!

Welcome back to another week of Kaizen. Last week, we discussed Optimizing the Use of Record ID Variables in Zoho CRM Queries.

This week, we will explore two important APIs for managing duplicate records in Zoho CRM - Duplicate Check Preferences API and Upsert Records API. While both of these APIs help manage duplicate records, they serve different purposes and are to be used in different scenarios. 




This post covers:
  • What is the Duplicate Check Preferences API?
    • Use Case
    • Duplicate Check Configurations
    • Updating Duplicate Check Configuration
    • How Duplicate Check Preferences Work During Record Creation/Update?
  • What is the Upsert API?
    • Use Case
  • Differences between Duplicate Check Preferences API and Upsert API

What is the Duplicate Check Preferences API

The Duplicate Check Preferences API is a configuration API that allows you to set up criteria using unique fields to manage duplicates across Leads module including Converted Leads and Contacts
in Zoho CRM. Based on the given criteria, the system will restrict the creation or update of duplicate records. For example, if the Phone field is marked as unique and set for duplicate checks, the system will make sure that no two records have the same phone number during records creation or update.

With the Duplicate Check Preferences API, you can define criteria to find duplicates, such as matching email addresses, phone numbers, or custom fields. During record creation or update, Zoho CRM checks the configured criteria against converted leads or contacts. If a match is found, it triggers a "DUPLICATE_DATA" error and blocks duplicates based on your configuration.

By default, the Insert Records API and Update Records API automatically check for this configuration. If a record matches the defined duplicate criteria, the system prevents its creation or update.

Use case

Zylker, a sales team managing customer contacts in Zoho CRM, often imports leads from various sources like website forms, events, and campaigns. However, the team noticed that many duplicate contacts are being created because the same phone number is associated with some of the contacts. This creates confusion and results in redundant work in their sales process.
By using the Duplicate Check Preferences API, Zylker can prevent the anymore duplicate contacts based on phone numbers (phone is used for an example).

Duplicate Check Configurations

In Zoho CRM, you can configure duplicate check preferences via API in two ways. 

i. Configuration in Leads module
The system checks for duplicates on all the Leads using the specified unique fields. By selecting this option, the duplicates will be checked on all the Converted Leads (custom view) as well. This configuration is applicable across all the layouts.
The following is the configuration for duplicate check in the Leads module via API. 

Request Method: POST

Note:
  • The "module" parameter is mandatory, and its supported value is Leads. 
  • The above URL applies to both Leads and Contacts module configurations.
  •  You must mark at least one field as mandatory. So, the system can check for duplicates based on the value in the unique field within the Leads module when creating a record.
Input JSON

{
    "duplicate_check_preference": {
        "type": "converted_records", //Converted Leads custom view in Leads module
    }
}


Response

{
    "duplicate_check_preference": {
        "code": "SUCCESS",
        "details": {},
        "message": "Duplicate check enabled for converted_records successfully.",
        "status": "success"
    }
}




ii. Configuration in Contacts module

By selecting this option, the system will check for duplicates in the Contacts module using mapped fields.

Input JSON

{
    "duplicate_check_preference": {
        "type": "mapped_module_records",
        "type_configurations": [
            {
                "field_mappings": [
                    {
                        "current_field": {
                            "api_name": "Email",
                            "id": "5725767000000002601"
                        },
                        "mapped_field": {
                            "api_name": "Email",
                            "id": "5725767000000002503"
                        }
                    }
                ],
                "mapped_module": {
                    "api_name": "Contacts",
                    "id": "5725767000000002179"
                }
            }
        ]
    }
}


The "Phone" field from both the Leads and Contacts modules is mapped to identify duplicate records.

How Duplicate Check Preferences Work During Record Creation/Update

Consider Zylker has configured the Contacts module ("type":"mapped_module_records") to check duplicate contacts.
For example, a sales representative at Zylker attempts to add a contact from the Cold Call lead source. However, the same contact already exists in the Contacts module, either from the same or a different lead source.
Since the Contacts module is configured for duplicate check preferences, the system will check for duplicates in the Contacts module using mapped fields. During the record insertion action, the system verifies the Contacts module for any matching records based on these unique identifiers. Based on the result, it either creates the record or throws an error.

Use the Insert Records API to create records in a module.

Request Method: POST

Input JSON

{
    "data": [
        {
            "Company": "Villa Margarita",
            "Last_Name": "Dolan",
            "First_Name": "Brian",
            "Email": "brian@villa.com",
            "Phone": "12345",
            "State": "Texas"
        }
    ]
}


Response


 {

    "data": [

        {

            "code": "DUPLICATE_DATA",

            "details": {

                "api_name": "Email",

                "duplicate_record": {

                    "Owner": {

                        "name": "Patricia Boyle",

                        "id": "5725767000000411001",

                        "zuid": "808233918"

                    },

                    "module": {

                        "api_name": "Contacts",

                        "id": "5725767000000002179"

                    },

                    "id": "5725767000000774010" //The record that already exists in the Contacts module.

                },

                "json_path": "$.data[0].Email",

                "more_records": false

            },

            "message": "duplicate data",

            "status": "error"

        }

    ]

}


Duplicates are also checked during record updates. If a record is updated with a value that already exists in a unique field, the system indicates it as a duplicate and returns a "DUPLICATE_DATA" error.

Update Duplicate Check Configuration

To update the previously enabled Duplicate Check option configured in your account, use the Update Duplicate Check Option API.


The Contacts ("type": "mapped_module_records") configuration is used in the below sample input. 


{
    "duplicate_check_preference": {
        "type": "mapped_module_records",
        "type_configurations": [
            {
                "field_mappings": [
                    {
                        "mapped_field": {
                            "api_name": "Phone", //The previously configured Email field as a unique identifier in Contacts has now been replaced with the Phone field.
                            "name": "Contacts",
                            "id": "5725767000000411001"
                        },
                        "current_field": {
                            "api_name": "Phone",
                            "name": "Leads", //The previously configured Email field as a unique identifier in Leads has now been replaced with the Phone field.
                            "id": "5725767000005381030"
                        }
                    }
                ],
                "mapped_module": {
                    "api_name": "Contacts",
                    "name": "Contacts",
                    "id": "5725767000000002179"
                }
            }
        ]
    }
}

You can also retrieve and delete duplicate configuration.

What is the Upsert API?

The Upsert API is a combination of "update" and "insert". 


How it works?

  • You provide a unique identifier (e.g., email, phone number, or a custom field) to check for existing records.

  • If a record with the same identifier exists, it updates that record.

  • If no matching record is found, it creates a new one.

Flow diagram

Use Case 

Zylker, an e-commerce company, uses Zoho CRM to manage customer data. Customers sign up on Zylker’s online store, and their details are stored in the e-commerce platform like Shopify. Over time, customers may update their contact information, or new customers may sign up. To keep customer records in Zoho CRM accurate and avoid duplicates, Zylker uses the Upsert API to:
  • Update existing customer records details if the given unique identifier, such as email or phone number, matches an existing record in Zoho CRM.
  • Insert a new record if no match is found.  This way, Zylker ensures that new customers are added efficiently.

There are two types of duplicate check fields:

i. System-defined duplicate check fields.
ii. User-defined duplicate check fields.

i. System-defined duplicate check fields
The table below lists the system-defined unique fields. When you create a record using the Upsert API, the system checks these fields for duplicate entries. 

Leads

Email

Contacts

Email

Accounts

Account_Name

Deals

Deal_Name

Campaigns

Campaign_Name

Cases

Subject

Solutions

Solution_Title

Products

Product_Name

Vendors

Vendor_Name

PriceBooks

Price_Book_Name

Quotes

Subject

SalesOrders

Subject

PurchaseOrders

Subject

Invoices

Subject

Custom Module

Name


ii. User-defined duplicate check fields
You can set a normal field as a duplicate check field by enabling "Do not allow duplicate values." Note that you can only set fields with the following field-types as unique— Single Line, Email, Phone, Number, Long Integer, and URL.


Request Method: POST

Sample Input JSON

Here, "Email," a system-defined field, has been used as a duplicate check field.
{
    "data": [
        {
            "Email": "alice@mail.com",
            "First_Name": "Alice",
            "Last_Name": "Brown",
            "Phone": "+1-555-222-3333",
            "Order_Date": "2024-01-10",
            "Order_Value": "$175.00"
        },
        {
            "Email": "pat@mail.com",
            "First_Name": "pat",
            "Last_Name": "Davis",
            "Phone": "+1-555-666-7777",
            "Order_Date": "2024-01-15",
            "Order_Value": "$300.00"
        }
    ],
    "duplicate_check_fields": [
        "Email" //You can set the order in which the system checks for duplicate records by specifying the duplicate_check_field array in the input. 
    ]
}

Response


{
    "data": [
        {
            "code": "SUCCESS",
            "duplicate_field": null,
            "action": "insert",
            "details": {
                "Modified_Time": "2025-02-08T09:43:08-08:00",
                "Modified_By": {
                    "name": "Patricia Boyle",
                    "id": "5725767000000411001"
                },
                "Created_Time": "2025-02-08T09:43:08-08:00",
                "id": "5725767000005425036",
                "Created_By": {
                    "name": "Patricia Boyle",
                    "id": "5725767000000411001"
                }
            },
            "message": "record added",
            "status": "success"
        },
        {
            "code": "SUCCESS",
            "duplicate_field": "Email",
            "action": "update",
            "details": {
                "Modified_Time": "2025-02-08T09:43:08-08:00",
                "Modified_By": {
                    "name": "Patricia Boyle",
                    "id": "5725767000000411001"
                },
                "Created_Time": "2025-02-08T08:52:22-08:00",
                "id": "5725767000005425002",
                "Created_By": {
                    "name": "Patricia Boyle",
                    "id": "5725767000000411001"
                }
            },
            "message": "record updated",
            "status": "success"
        }
    ]
}


For more details on how the Upsert API works, refer to the Kaizen #56 - Upsert Records #API.

Differences between Duplicate Check Preferences API and Upsert API

 

                Duplicate Check API

                           Upsert API

Duplicate Check Preferences can be enabled only in the Leads module.

Supports all modules.

Throws a "DUPLICATE_DATA" error if a duplicate is detected.

Updates the existing record with new field values if a match is found for the unique fields; otherwise, inserts a new record.


Use the above Zoho CRM APIs which fit your use cases.
---------------------------------------------------------------------------------------------------------------------

We trust that this post meets your needs and is helpful. Let us know your thoughts in the comment section or reach out to us at support@zohocrm.com 
Stay tuned for more insights in our upcoming Kaizen posts!

Info

    • Sticky Posts

    • Kaizen #198: Using Client Script for Custom Validation in Blueprint

      Nearing 200th Kaizen Post – 1 More to the Big Two-Oh-Oh! Do you have any questions, suggestions, or topics you would like us to cover in future posts? Your insights and suggestions help us shape future content and make this series better for everyone.

    • Kaizen #226: Using ZRC in Client Script

      Hello everyone! Welcome to another week of Kaizen. In today's post, lets see what is ZRC (Zoho Request Client) and how we can use ZRC methods in Client Script to get inputs from a Salesperson and update the Lead status with a single button click. In this

    • Kaizen #222 - Client Script Support for Notes Related List

      Hello everyone! Welcome to another week of Kaizen. The final Kaizen post of the year 2025 is here! With the new Client Script support for the Notes Related List, you can validate, enrich, and manage notes across modules. In this post, we’ll explore how

    • Kaizen #217 - Actions APIs : Tasks

      Welcome to another week of Kaizen! In last week's post we discussed Email Notifications APIs which act as the link between your Workflow automations and you. We have discussed how Zylker Cloud Services uses Email Notifications API in their custom dashboard.

    • Kaizen #216 - Actions APIs : Email Notifications

      Welcome to another week of Kaizen! For the last three weeks, we have been discussing Zylker's workflows. We successfully updated a dormant workflow, built a new one from the ground up and more. But our work is not finished—these automated processes are

    • Recent Topics

    • Automate pushing Zoho CRM backups into Zoho WorkDrive

      Through our Zoho One subscription we have both Zoho CRM and Zoho WorkDrive. We have regular backups setup in Zoho CRM. Once the backup is created, we are notified. Since we want to keep these backups for more than 7 days, we manually download them. They

    • How to charge Convenience fee OR payment gateway charges to the end client who is paying the invoice?

      Hello, I am creating this topic after having discussions with various sets of users and have understood that with people moving more and more to digital payments, it is important for the client to enable the "Convenience fee" kind of scenario. I have

    • Exciting Updates to the Kiosk Studio Feature in Zoho CRM!

      Hello Everyone, We are here again with a series of new enhancements to Kiosk Studio, designed to elevate your experience and bring even greater efficiency to your business processes. These updates build upon our ongoing commitment to making Kiosk a powerful

    • New activity options for workflows

      Greetings, We are excited to announce the addition of two new dynamic actions to our workflow functionality: Create Event and Schedule Call. These actions have been thoughtfully designed to enhance your workflow processes and bring more efficiency to

    • Remove the “One Migration Per User” Limitation in Zoho WorkDrive

      Hi Zoho WorkDrive Team, Hope you are doing well. We would like to raise a critical feature request regarding the Google Drive → Zoho WorkDrive migration process. Current Limitation: Zoho WorkDrive currently enforces a hard limitation: A Zoho WorkDrive

    • Kaizen #228 - Process Large-Scale Migrated Data Using Catalyst Solutions

      Howdy, tech wizards! This week’s Kaizen explores how Catalyst Solutions in the Zoho CRM Developer Hub help import large volumes of data into Zoho CRM while improving data quality and simplifying the migration process. Why Catalyst Solutions? Catalyst

    • Zoho Expense Import Reports Won't Work Because Default Accounts Already Exist

      Im trying to import reports from another Zoho expense account to mine and im getting errors that won't allow the import to happen The account name that you've entered 'Ground Transportation' already exists. Enter another name for the account and try again.z

    • Inactive License for free account.

      I recently upgraded my Cliq subscription not my team (on the free version), are unable to login to their accounts. The error message received is Inactive License Looks like you have not been covered under the current free plan of users. Please contact

    • Syncing zoho books into zoho crm

      I was wondering how I can use zoho books in crm as I have been using them separately and would like to sync the two. Is this possible and if so, how? Thanks

    • Announcing new features in Trident for Mac (1.34.0)

      Hello everyone! We’re excited to introduce the latest updates to Trident, which are designed to take workplace communication to the next level. Let’s take a quick look at what’s new. Connect with customers using Zoho Voice integration. You can now easily

    • How Zoho Contracts Makes Negotiations Clear, Secure, and Transparent

      Negotiation is one of the most critical—and often most chaotic—stages of the contract lifecycle. Multiple stakeholders review the same document, propose changes, debate terms, and exchange feedback. Without the right tools, this collaborative process

    • Error: Invalid Element tax_override_preference

      In both Books and Inventory, we're getting the following error whenever we try to enter any Bill: I think this is a bug. Even cloning an old bill (that obviously was entered just fine), this error occurs.

    • Assign Income to Project Without Invoice

      Hello, Fairly new user here so apologies if there is a really obvious solution here that I am just missing... I have hundreds of small deposits into a bank account that I want to assign to a project but do not want to have to create an invoice every time

    • How to Print the Data Model Zoho CRM

      I have created the data model in Zoho CRM and I want the ability to Print this. How do we do this please? I want the diagram exported to a PDF. There doesnt appear to be an option to do this. Thanks Andrew

    • our customers have difficult to understand the Statements

      our costumers have big problems to understand Zohos Statements. we need a text box after the payment number to explain what the payments are for. Is it possible to develop a version of the Statement with that kind of box and if so whu can do it

    • How to track a list of ALL the items that ONE customer bought?

      Hello, I am interested in getting a list of all the items that only ONE of my customers bought, and the invoices are what show up instead. It's very tedious to go through every single invoice when we sell a lot of items to this customer. Surely there

    • Exchange Rate Updates

      Hi, It would be great that when you work with multiple currencies, the exchange rate updates automagically every day (as seen on Zoho Books) or at least that when you create/update an opportunity the exchange rate could be manually updated, or maybe both!

    • Locked Out of Super Admin Account

      I'm locked out of my Super Admin account and the external e-mail is no longer associated with it. There seems to be a problem during set up, the system ought to ask to assign a new password instead of using Google accounts. Please help me get back access.

    • Emails are going to notification folder and not in inbox

      emails are going to notification folder and not into inbox

    • 550 5.4.6 Unusual sending activity detected. Please try after sometime

      Hi, I am receiving this error message when trying to send my emails. The only reason I can think why this is happening is my previous two emails were bounced back to me due to a non working mailbox error. I have followed the online links for unblocking

    • Projects Home Customization

      Hello! We've been in Zoho One since July of last year, and my team has started providing feedback on what they'd like to do. Their latest wish is that they could have more control over the Projects Home content. For example, they want a card that shows

    • IMAP search support

      Does Zoho Mail support IMAP search? https://www.rfc-editor.org/rfc/rfc9051.html#name-search-command TEXT <string> Messages that contain the specified string in the header (including MIME header fields) or body of the message. Servers are allowed to implement

    • Performance is degrading

      We have used Mail and Cliq for about three years now. I used to use both on the browser. Both have, over the past 6 months, had a severe degradation in performance. I switched to desktop email, which appeared to improve things somewhat, although initial

    • Cannot reorder fields in Page Layout in Expenses and Purchase Requests

      It is very inconvenient that the custom fields in Page Layout cannot be re-ordered. The only way is to remove the fields and re-create them; however, it is impractical. This would affect the reports and dashboards we are having. Not able to re-order the

    • bouncing emails

      My recurring invoices have bounced back

    • Probable Scam / Phising attempt from email pretending to be Zoho

      I think this is a scam email right? It says "zohCworkplace.com". I'm on the Mail Free plan The link in the CTA button seems to go to a redirect. Just wanted to bring it up to the security team.

    • Feature Request: Ability to set Default Custom Filters and apply them via URL/Deluge

      I've discovered a significant gap in how Zoho Creator handles Custom Filters for reports, and I'm hoping the Zoho team can address this in a future update. This limitation has been raised before and continues to be requested, but remains unresolved. The

    • Email Address Search in "To" Field Search is broken, Zoho refuses to fix it

      Typing a part of the email address string other than the beginning of the string does NOT work, I kindly urge Zoho to fix this. Let's say you remember writing an email so someone called "smith" from company "corp.com", but can't remember their first name,

    • Emails not being received by @hotmail.com, @outlook.com and a few others

      When I try to send emails from zoho mail to people with email addresses ending @outlook.com and @hotmail.com (and a few others), I get a 'delayed' automatic email and then a few hours later, an 'undelivered' automatic email. This has started a few months

    • scroll bar for far left of screen

      I am unable to even see the scroll bar to the right of "inbox" etc on the left; it is stuck at "streams" and I can't get to inbox or anything else. It would help if it could be made a lighter color as the black or dark grey can't bee seen.

    • OUt of office every friday

      Hi, I tryed to configure my out of office, because i'm not working or emailing on fridays. But when i select only friday as unavailable day, the out of office still sets for the whole week. What am I doing wrong?

    • Signature line

      How do I set signature line in email

    • Zoho email

      I cannot send email to mail.ru

    • 【参加無料】東京 Zoho ユーザ交流会 NEXUS ー CRMで始めるマーケティング事例 / AI活用法(Zia Agents)

      ユーザーの皆さま、こんにちは。コミュニティチームの藤澤です。 3月27日(金)に東京、新橋で東京 Zoho ユーザー交流会 NEXUS を開催します！ 昨年度までより、さらにパワーアップして戻ってきました！ ユーザー活用事例は、2人のユーザーさんからお話しいただきます。Zoho サービスの活用の幅を広げたい方や、他のユーザーの利用法を気軽に知りたい方など、多くの方にとって学びのあるセッションになること間違いなしです✨ また今年は、これまで以上に、AI機能にも焦点を当てて行く予定です。 初回として、Zoho社員からZoho

    • Issue Exporting Data – CSRF Token Invalid Error

      Dear Zoho Team, We are experiencing an issue when exporting data from our Analytics workspace. Whenever we attempt to export data from our analytical pool, the system displays the following alert message: Alert Message: The CSRF token is invalid. It could

    • Deluge Learning Series – Client functions in Deluge | January 2026

      We’re excited to kick-start the first session of the 2026 Deluge Learning Series (DLS) with Client functions in Deluge. For those who are new to DLS, here’s a quick overview of what the series is all about: The Deluge Learning Series takes place on the

    • Zoho Mail 505 error I can not send email

      Hi, I’m having issues sending emails from my custom domain email address. When I send emails to Outlook addresses, I receive an “Undeliverable 505” error. However, emails send and receive correctly when I use Gmail. This is important for my business,

    • Multiple MFA Methods

      With SMS-based MFA methods being discontinued, there is now no way to have mutliple MFA methods. I'd like to add my zoho account on two seperate phones using the Google Authenticator app. In the https://accounts.zoho.com/home#multiTFA/modes you can only

    • Reuse Standalone Function

      I noticed that there's a missing information in documentation to reuse a standalone function and it is because the parameters require an argument. Here is my code and it is working. response = invokeurl [ url: "https://people.zoho.com/api/v3/function/sample/execute"

    • Domain renewals

      Need to know how hoe to renew the domain

    • Next Page