Duplicate Check Preferences API vs. Upsert API

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 #197: Frequently Asked Questions on GraphQL APIs

      🎊 Nearing 200th Kaizen Post – We want to hear from you! 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 #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.

    • Celebrating 200 posts of Kaizen! Share your ideas for the milestone post

      Hello Developers, We launched the Kaizen series in 2019 to share helpful content to support your Zoho CRM development journey. Staying true to its spirit—Kaizen Series: Continuous Improvement for Developer Experience—we've shared everything from FAQs

    • Kaizen #193: Creating different fields in Zoho CRM through API

      🎊 Nearing 200th Kaizen Post – We want to hear from you! 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.

    • Client Script | Update - Introducing Commands in Client Script!

      Have you ever wished you could trigger Client Script from contexts other than just the supported pages and events? Have you ever wanted to leverage the advantage of Client Script at your finger tip? Discover the power of Client Script - Commands! Commands

    • Recent Topics

    • Link(s) between Notes

      Hello Everyone, It would be great if links could be created between notes. Let's say we have 5 Notes A, B, C , D, E. I would like to be able to link Note A to Note B but not in other way, so no link appears in Note B linking to Note A. An so on, linking

    • Option to Hide Project Overview for Client Profiles

      In Zoho Projects, the Project Overview section is currently visible to client profiles by default. While user profiles already have the option to restrict or hide access to the project overview, the same flexibility isn’t available for client profiles.

    • Zoho Books | Product updates | August 2025

      Hello users, We’ve rolled out new features and enhancements in Zoho Books. From the right sidebar where you can manage all your widgets, to integrating Zoho Payments feeds in Zoho Books, explore the updates designed to enhance your bookkeeping experience.

    • Feature Request: Assign Documents to Already Entered Bills, Expenses, Invoices, etc.

      Hi Zoho Team, We are regular users of the Documents module in Zoho Books and appreciate its ability to keep financial records well-organized. However, we’ve noticed a limitation: There is no way to attach a document from the "Documents > Files" section

    • I don't see any WITHDRAWL transaction at all

      Hi I manually imported my bank statement to Zoho books today and I am a complete newbie. I have been reading the knowledgebase but unable to fix this. I only see "Uncategorized 91 DEPOSIT transactions". I don't see any WITHDRAWL transaction at all. Also,

    • Shared inbox unable to see replies

      Hi we are a small company me and someone else, we have a shared inbox for our sale@ and contact@ however we have this issue where by if i reply to an email or the other person reply to the email, it does not show it to them and therefore we end up replying

    • Kaizen #136 - Zoho CRM Widgets using ReactJS

      Hey there! Welcome back to yet another insightful post in our Kaizen series! In this post, let's explore how to use ReactJS for Zoho CRM widgets. We will utilize the sample widget from one of our previous posts - Geocoding Leads' Addresses in ZOHO CRM

    • 404 error at checkout

      Our customers are getting a 404 error at checkout. Anyone else with the same problem?

    • FONT Sizing in Notebook

      Hi Kishore - What is the status of adding font sizing to the application? I have several things that I have pasted directly into Notebook and the fonts are HUGE! I would like the ability to highlight them and reduce the font to a legible size. Nothing

    • Can managers Upload documents to their direct rapports?

      Admin employees have the ability to upload documents to employees' files; however, managers do not have add/manage button - is it possible for managers to upload their direct reports' documents, such as absence documents or 121 documents. Is there something

    • Leave balance display for next year

      Is there a way to not have a rollover or not limit the leave balance depending on the date. For example an employee has 10 days leave balance and wants to apply for January leave in December. They cant because the rollover doesnt show the leave balance

    • Please add an “Auto-Apply Unused Credits” toggle

      Hello — please add a simple org-level option to automatically apply unused credits (credit notes, excess payments, retainers) to new invoices and/or bills. An ON/OFF toggle with choices “invoices”, “bills”, or “both” would save lots of manual work for

    • Zoho Books not working/loading

      Hi! I haven't been able to access/load Zoho Books for the past hours. I get a time out (and it is not due to my internet connection). Could you please check this asap? Thank you!

    • Custom Fields with Data Types for Expense and Payments Received in Zoho Books

      Hi all, We are glad to present to you, the option to create Custom Fields for the Expense and Payments received modules in Zoho Books. This also comes with an icing on top of it - Yes, the custom fields can now be created with different data types. Types like Text, Number, Decimal, Amount, Auto Number and Check Box are supported as of now. Rush to the gear icon at the top right corner, select 'More Settings', choose 'Preferences' in the left pane. Click the Expense/Payment preferences where you can

    • Zoho Cliq - Incident alert (Server outage - IN DC) | August 28

      We've received server down alerts and are currently investigating the issue (IN DC) to find the root cause. Our team is actively working to restore normal operations at the earliest. Status: Under investigation Start time: 09:44:21 AM IST Affected location:

    • Claude + MCP Server + Zoho CRM Integration – AI-Powered Sales Automation

      Hello Zoho Community 👋 I’m excited to share a recent integration we’ve worked on at OfficehubTech: ✅ Claude + MCP Server + Zoho CRM This integration connects Zoho CRM with Claude AI through our custom MCP Server, enabling intelligent AI-driven responses

    • How can I see content of system generated mails from zBooks?

      System generated mails for offers or invices appear in the mail tab of the designated customer. How can I view the content? It also doesn't appear in zMail sent folder.

    • Limitations on editing a message in Cliq

      Hi I've checked the documentations and there's no mention of how many times a message can be edited. When trying with code, I get various numbers such as ~1000 edits or so. Please mention if there's a limit on how many times one can change a message via

    • Narrative 10: Assignment Rules - Streamlining Ticket Management

      Behind the scenes of a successful ticketing system: BTS Series Narrative 10: Assignment Rules - Streamlining Ticket Management In the complex world of customer support, a flood of incoming tickets can hit the help desk in seconds. Businesses must do more

    • Free webinar! Digitize recruitment and onboarding with Zoho Sign and Zoho Recruit

      Hello, Tired of being buried in onboarding paperwork? With the integration between Zoho Sign and Zoho Recruit, a powerful applicant tracking system, you can digitize and streamline the entire recruitment and onboarding process, all from one platform.

    • Custom form - Duplicate Value Present

      I am new to Zoho People. I create a new form on Zoho People quite simple. A date (by default the current date) and a radio button with 3 options (Yes, No, Not applicable) I defined the date as ‘No duplicate’ as only one entry by date is allowed. I added:

    • Zoho API connection issues

      Hi, Today at around 1930 GMT our application started experiencing intermittent timeouts from the Zoho API. These intermittent timeouts are not enabling our app to work properly. The API connection was working just fine before. HTTPSConnectionPool(host='www.zohoapis.com',

    • Query Regarding our Partnership between AIC-JKLU and Zoho

      Dear Zoho Team, I am writing to raise a concern on behalf of AIC-JKLU, one of Zoho’s incubator partners. Recently, our startups have been facing difficulties while trying to get themselves onboarded on Zoho through our dedicated partner link. Unfortunately,

    • Disputed Purchase Invoices

      We have recently moved to Zoho Books from Sage. In Sage we were able to post a purchase/vendor invoice but mark it as on dispute. This would usually be a pricing query or if something was damaged. It would show in their ledger, so we could agree their

    • Getting events in the future

      Hi I am trying to get events in the future by calling this API Endpoint https://www.zohoapis.eu/crm/v8/Events?fields=Event_Title,Created_By,Created_Time,Start_DateTime But that gives me all events in the database. How do I make a query that returns all

    • Created Date/Invalid Fields

      Since Saturday we have suddenly had issues with our webhooks and data retrieval from CRM. Specifically how Created Date is handled. It appears there was some sort of change within CRM that broke a lot of our code that has been in place for several years.

    • Zoho Inventory. Preventing Negative Stock in Sales Orders – Best Practices?

      Dear Zoho Inventory Community, We’re a small business using Zoho Inventory with a team of sales managers. Unfortunately, some employees occasionally overlook stock levels during order processing, leading to negative inventory issues. Is there a way to

    • integration zoho form - drive

      I integrated my form with Google Drive. The report of user submissions from the Google Form becomes a Google Sheets table. When I used Google Forms for the same task, the summary sheet adapted to the form. For example, if I added a new field to the form,

    • add employees and customiz

      I want a Zoho software to track employees record. I logged in a demo so now I tried adding employee, first thing when I click on add employee it takes me to a page where it says add user maximum 10 users, my first doubt why users I don't want employees

    • Revenue Management: #9 Revenue Recognition in Media & Publishing

      Media & Publishing industry has evolved in recent times. It offers subscriptions, bundles digital and print access, runs sponsored content, and sometimes even sells ad spaces. If you run a media or publishing business, you will always get into a situation

    • Zoho CRM Community Digest - July 2025 | Part 2:

      Hello, Everyone! We’re closing out July with a can’t-miss highlight: Zoholics Europe 2025! Happening from September to October, it’s your chance to level up your CRM skills, covering everything from automation and CPQ to dashboards and advanced workflows.

    • How can I trigger a flow action only once while updating contact?

      Hi, we have a trigger to merge&mail file when the field YYY is filled out. For this acion I used "Create or update module entry". But unfortunately we get tens of email on a day with this merged file, because the contact is being regularly updated. The

    • Copy a Record Template from one Form to another

      I have a Creator application with several forms.  I developed a record template for one of the reports/forms but want to use most of it for another of the form/report combinations in the application. Is there a way to copy the template (code or otherwise) to another form?

    • Tip of the Week #70 – Create common team signatures for your shared inboxes

      Did you know that a small detail, such as an email signature, can make a big difference in how your brand is perceived? One simple yet smart way to enhance your team’s communication is by creating common team signatures for your shared inboxes. Instead

    • Enhanced data export features: XLSX format, custom character encoding, and selective record export

      Greetings all, Here are a few enhancements related to exporting CRM data, including the ability to export data in XLSX file format now. The Export feature under Data Administration now offers new options that expand its flexibility and enable users to

    • Tip #42 – How to manage data security with Privacy Settings – 'Insider Insights'

      Data privacy is a cornerstone of trust in remote support. Through Privacy Settings in Zoho Assist, you can set up how data is gathered, stored, and handled in your organization. These settings ensure compliance, data protection for sensitive details,

    • Zoho DataPrep and File Pattern configuration

      I'm using Zoho data prep to ingest data from One Drive into Zoho Analytics... The pipeline is super simple but I can't any way to get all the files that I need. Basically I need to bring all the files with a certain pattern and for that I'm using a regex

    • Introducing Dark Mode / Light Mode : A New Look For Your CRM

      Hello Users, We are excited to announce a highly anticipated feature - the launch of Day, Night and Auto Mode implementation in Zoho CRM's NextGen user interface! This feature is designed to provide a visually appealing and comfortable experience for

    • Quick Item Search & Auto-suggestion for Invoices

      Hi Team, I am facing an issue while creating invoices in Zoho Books. Currently, I have to type the full item name in the correct sequence and spelling for it to appear. For example, my item name is: "Distemper Acri Silk Special White 10kg" If I type something

    • Ticketbai! en el Pais Vasco

      Hola a todos, En enero de 2.022 se va a implantar en el país vasco un nuevo sistema de facturación, denominado ticketbai!, ¿hay alguna previsión de realizar las adaptaciones en zoho books o zoho invoices? Ignoro la cantidad de clientes que tienen estas

    • Next Page