Kaizen #116 - Client Types in Zoho API Console

Kaizen #116 - Client Types in Zoho API Console

Hello everyone!
Welcome back to another post in the Kaizen series!

This week, we will discuss different client types available in Zoho API Console, and when to use each.

When you register an app in Zoho API Console, you typically choose a client type based on how your application interacts with Zoho services.
Let us discuss the available client types and how authorization is handled for each.

Available client types

  1. Server-based
  2. Client-based
  3. Self client
  4. Non-browser-based
  5. Mobile-based

1. Server-based

If you have a web-based application that runs on a dedicated HTTP server and interacts with Zoho services by calling Zoho APIs via that server, you must register your app with this client type.
This client type is for applications that redirect the users to another URL on a web browser to authorize themselves, where they give consent to your application to use their data.
In other words, you must use this client type when you have a front-end web UI and require user intervention before your app can access user data via the dedicated server.

Consider that you are developing a web-based custom application. Users authorize that app via browser to allow their Zoho CRM data to be accessed and used by that application.
During the registration process in Zoho API Console, you would choose the "Web-based" client type.
OAuth 2.0 would be used for user authentication, allowing your app to securely access and interact with Zoho CRM data on behalf of the users.

Here is a gist of what happens:
  1. Users visit your website where you have the Login with Zoho button.
  2. When a user clicks it, that user will be redirected to accounts.zoho.com with the details of your app such as client ID, scope, redirect uri, access type as the URL parameters.
  3. Your app must make an API call to Zoho Accounts with the client ID, scope, redirect uri, and access type. Users are shown the data that your application wants to use.
  4. When users give their consent, Zoho redirects them back to your app.This will be the "Redirect URL" you give while registering your app.
  5. The redirect URL will have the authorization code(grant token) as one of the parameters, along with the location(user's domain).
  6. Your app must then make API calls from your web server to Zoho Accounts to generate access and refresh tokens with the generated grant token.
  7. You must store these tokens in your DB to access that user's data in Zoho CRM. While making API calls, you must send this access token in the header.
  8. Your app must also have the logic to regenerate access tokens from refresh tokens when the access token expires.
Note that your app must take care of storing user's details like email, organization ID, and tokens.

The following image shows the protocol flow.


You can use any of our server-side SDKs to simplify this process.
When you use our SDK, all you have to do is, generate the grant token and initialize the SDK with the client details and this token. The SDK takes care of access token generation, refreshing it, and token storage.


For more details, you can refer to the Accounts guide and CRM help doc.

2. Client-based applications

This client type is for applications that do not have a server and run exclusively on a web browser.
This is also called the Implicit flow as your app makes API calls to Zoho only when users are using your app.
This type of application loads data dynamically on the webpage, and accesses Zoho CRM data by making API calls via Javascript.

Consider the same example where there is a Login with Zoho button on your webpage.
Here is a gist of what happens when a user clicks it.
  1. Your app redirects the user to Zoho Accounts.
  2. Your app makes the authorization request with the client ID, redirect uri, scope, and response type as token.
  3. The user is shown the data that your webpage would use.
  4. When the user gives consent, Zoho Accounts sends the access token to the redirect uri as a parameter, along with the expiry time and the location of user's data in Zoho's accounts server.
  5. You can include the "email" in your scope parameter in the access token request to get user's information. The response will have a parameter called id_token that will be in the header.payload.signature format. You need to decrypt the payload section of the parameter using the base-64 decryption algorithm to get user information.
  6. Your app must then make API calls to Zoho with this access token to fetch data.
  7. When the access token expires, your app must take care of regeneration and storage.


As the API calls are made from your domain to a different domain(zohoapis.com), for security reasons, the browser will throw the CORS error. So, your domain will be registered while registering your app, and Zoho will know to allow the API calls made from that domain.

As the tokens are available on the browser itself, we recommend handling them with care.
When you use our client-side JS SDK, it automatically generates a new access token upon expiry.

3. Self Client Applications

When your application does not have a redirect URL or a UI, but performs only a backend job, and does not need user intervention, then you must choose this client type.

A self client is often used when the application and Zoho services are operated by the same entity, and you want to enable secure communication between them. For example, you have an internal reporting tool and integrate it with Zoho Analytics. In this case, both the tool and Zoho Analytics are operated by the same entity.
Similarly, consider that you have a legacy product management system and want to perform data sync between Zoho CRM and the system, then you must use the self client.

Here is a gist of what happens.
  1. You register your app as self client in Zoho API Console.
  2. You will get the client details such as ID and secret.
  3. You provide the scopes required for your app to access CRM data.
  4. You will receive the grant token.
  5. Your app must then make API calls to Zoho Accounts to generate access and refresh tokens.
  6. Your app can then use this access token to make API calls to Zoho CRM and use data.
You can refer to our older Kaizen post on this topic for more details.
Note that self client apps can also use any of our server-side SDKs. As already said, the SDK takes care of access and refresh token generation, refreshing the access token, and token storage.

4. Non-browser applications

This client type is for devices that do not have a user agent such a web browser. A TV, for instance.
Let us consider an example involving a smart TV application that integrates with Zoho ShowTime. In this scenario, the smart TV application acts as a non-browser client.
Here is how authentication is handled:
  1. You must register your smart TV app in Zoho API Console with the type "Non-browser application".
  2. Users install a dedicated Zoho ShowTime application on their smart TVs.
  3. When users launch the Zoho ShowTime application on their smart TV, they are prompted to authenticate with their Zoho ShowTime account.
  4. When they successfully authenticate, Zoho Accounts sends the grant token to your app, along with the user-code, device-code and verification URL,The user must go to this verification URL on a browser and enter the user-code to grant permission to the app.
  5. Meanwhile, your app must poll the accounts server using the grant token to check if the token has been received.
  6. When the user enters the user code, Zoho Accounts sends the access token to your app.
  7. Your app can then use the access token to make API calls to Zoho. Your app must take care of token storage and renewals.

Here is the protocol flow. For more details, refer to this doc.


5. Mobile-based applications

You must use this client type when you have developed an app exclusively for mobile devices. The protocol flow is similar to server-based application where a browser session is required for the users to authenticate.



Similar to server-side apps, mobile apps also need to handle redirection, token generation and storage.
If you use any of our Mobile SDKs, the SDK itself handles token generation and storage.

We hope you found this post useful. Let us know your thoughts in the Comment section or write to us at support@zohocrm.com.


Cheers!

    • Recent Topics

    • Tip #3 Automating total item weight calculation for your sales orders in Zoho Inventory

      Hello, Hope the day is treating you well. Last week, we saw how we could automate the calculation of total shipping charges from numerous shipments for your sales orders and invoices. This week, we will see how you can automate the calculation of total item weight for your sales orders.  How does this work? First, you are required to capture the weight of all your items using a custom field. And when you create a sales order, you can either have the system display the individual weights for you or

    • Why Format section gets disabled when we create Merge Template over PDF

      I need some assistance I have a Client who is going to give certificates to users who passes his exam. So, I am using mail merge but in ZOHO writer after I upload the PDF and create merge Template over PDF the format Section gets disabled. My problem

    • Whatsapp Integration on Zoho Campaign

      Team: Can the messages from Zoho Campaign delivered through Whatsapp... now customers no longer are active on email, but the entire campaign module is email based.... when will it be available on whatsapp.... are there any thirdparty providers who can

    • How to calculate separate totals for Product Line Items filtered by category in Quotes?

      Hello! I'm working with Quotes in Zoho CRM and need help calculating conditional totals for line items. Current setup: I have two tables in my Quote template (Zoho Writer), both displaying Quoted Line Items Table 1 (top): Shows all products where Product

    • I Need Help Verifying Ownership of My Zoho Help Desk on Google Search Console

      I added my Zoho desk portal to Google Search Console, but since i do not have access to the html code of my theme, i could not verify ownership of my portal on Google search console. I want you to help me place the html code given to me from Google search

    • Zoho Desk API Documentation missing a required field

      We are trying to create a section using this information. Even after preparing everything based on that page, we still get an error. The error we get is this: {"errorCode":"INVALID_DATA","message":"The data is invalid due to validation restrictions","errors":[{"fieldName":"/translations","errorType":"missing","errorMessage":""}]}

    • Fetch Subform values through a lookup of a lookup

      Hi, I'm having an issue fetching the values of a subform through a lookup field through another lookup field. The code works perfectly to show me the subform row ID, but the second I try to get any readable data, it says "Error occurred. Please contact

    • Good news! Calendar in Zoho CRM gets a face lift

      Dear Customers, We are delighted to unveil the revamped calendar UI in Zoho CRM. With a complete visual overhaul aligned with CRM for Everyone, the calendar now offers a more intuitive and flexible scheduling experience. What’s new? Distinguish activities

    • Turn Decision Box to a button

      Dear all, I need your help on CSS to turn a Decision Box to a Button. I have a Decision Box like: Turn on/off to refresh the information. (on User Input, either True or False, will refresh the information) Now I want to simulate to treat it like a Refresh

    • Emails not being received from a particular domain

      Cannot receive any emails sent from atco.com Domain is in the spam whitelist so should be no reason for it not to be coming through. Have filed a ticket and besides a generic response of we are looking at it - it seems there is no actual support workers

    • Stock Count

      The stock count is a nice new feature, but we cannot figure out how to: 1. Use it without assigning to a person, we have a team or one of multiple do stock counts as do most any company. 2. Add any extra fields to what the "counter" sees. The most important

    • Can you import projects into Zoho Projects yet?

      I see some very old posts asking about importing project records into Zoho Projects. But I can't find anything up to date about the topic. Has this functionality been added? Importing tasks is helpful. But we do have a project where importing projects

    • Send Whatsapp message from Whatsapp template with custom variables

      Hi, I'm trying to do some basic integration for sending WhatsApp messages from Zoho CRM using Zoho Desk whatsapp templates. When creating new whatsapp template in Zoho Desk we can choose ticket related fields as variables but it's not clear how to use

    • How to remove some users in zoho accounts

      How to remove some users in Zoho accounts.

    • Outgoing blocked: Unusual activity detected.

      I just made payment for my Zohomail Today and have been debited so i will like to be Unblocked because this is what it says (Outgoing blocked: Unusual activity detected) Thank you i await your swift responses

    • Integrating with My Own Application and ZOHO CRM Simultaneously

      I have my own WhatsApp bot that uses my WhatsApp business account. I want to use the same phone number to integrate with ZOHO as well. What is the recommended way to do that? Should I integrate my application with ZOHO, forwarding messages whenever the

    • How do i move multiple tickets to a different department?

      Hello, i have several tickets that have been assigned to the wrong department.  I am talking about hundreds of automatically generated ones that come from a separate system. How can i select them all at once to move them to another department in one go? I can select them in "unsassigned open tickets view" but i can't find a "move to another department" option. I also can't seem to assign multiple tickets to the same agent in that same view. Could somebody advice?

    • Transferring CRM Attachments to Workdrive

      relatedrecords = zoho.crm.getRelatedRecords("Attachments","Conditions",conId); attachid = List(); for each ele in relatedrecords { attachementId = ele.get("id"); attachid.add(attachementId); } for each ele in attachid { counter = 1; downloadFile = invokeurl [ url: "https://www.zohoapis.com/crm/v2/Conditions/" + conId + "/Attachments/" + ele type: GET connection : "work_drive" ]; resp2 = zoho.crm.attachFile("Deals",dealId,downloadFile); resp3 = zoho.workdrive.uploadFile(downloadFile, dealWD, "PlaceHolder"+counter+"",

    • New Customization options in the module builder: Quick Create and Detail view

      Hello everyone, We have introduced two new components to the module builder: Quick create and Detail view. The Quick Create Component It is a mini form used to create a record and associate it to the parent record from a lookup field. For example, if you have a Deals lookup in the Contacts module, then you can associate existing deals or create a deal and associate it with the contact. You can customize this Quick Create form by adding standard as well as custom fields. There is no limit to the number

    • unblock my zoho mail account. outlines@zoho.com

      please unblock my zoho mail account, outlines@zoho.com

    • SMTP email sending problem

      Hello, I've sent emails before, but you haven't responded. Please respond. My work is being disrupted. I can't send emails via SMTP. Initially, there were no problems, but now I'm constantly receiving 550 bounce errors. I can't use the service I paid

    • Mailk got blocked / Inquiry About Email Sending Limits and Upgrade Options

      Dear Zoho Support Team, My name is Kamr Elsayed I created this account to use for applying for vocational training in Germany. As part of this process, I send multiple emails to different companies. However, after sending only 8 emails today, I received

    • Forwarder

      Hi, I tried to add a forwarder from which emails are sent to my main zoho account email . However, it asks me for a code that should be received at the forwarder email, which is still not activated to send to my zoho emial account. So how can I get the

    • No chat option

      Chat option is not supported.

    • Direct “Add to Google Calendar” Option in Zoho Meeting

      Hello Zoho Meeting Team, Hope you are doing well. We would like to request an enhancement related to the “Add to Calendar” functionality in Zoho Meeting. Currently, when we open Zoho Meeting and view our meetings under My Calendar, there is an Add to

    • Default Tagging on API-generated Transactions

      If one assigns tags to an Item or Customer, those tags get auto-populated in each line item of an Invoice or Sales Order when one creates those documents. However, if one creates the Sales Order or Invoice via the API (either directly coding or using

    • DKIM cannot be enabled for the domain as no verified default selector present

      Hi Support Team, For Domain DKIM record trying to enable status. but showing error "DKIM cannot be enabled for the domain as no verified default selector present" So, please resolve the issue. Thank you.

    • unable to send message reason 554 5.1.8 Email outgoing blocked

      unable to send message reason 554 5.1.8 Email outgoing blocked

    • I can't log in to my account on Thunderbird

      I've just had to rebuild my PC (calamitous mess from Microsoft with Win10/Win 11 'upgrade' - they confirmed I had to start with a new build). I have used Zoho mail for years via Mozilla Thunderbird, but now I've had to download the latest version of TBird,

    • Should I Use DMARC?

      When I configure Zoho Mail's DMARC settings, it's mandatory to fill in the RUA and RUF (Aggregate notification email address*, Forensic notification email address*) addresses. When we enter an email address in these fields, we receive reports from the

    • Introducing Profile Summary: Faster Candidate Insights with Zia

      We’re excited to launch Profile Summary, a powerful new feature in Zoho Recruit that transforms how you review candidate profiles. What used to take minutes of resume scanning can now be assessed in seconds—thanks to Zia. A Quick Example Say you’re hiring

    • Books API Receiving an Error that Doesn't Make Sense when Creating Credit Note - trying to use 'ignore_auto_number_generation' argument

      Hello, I'm working on a newly created routine and I'm getting an error that doesn't make sense when trying to create a new Credit Note. Here is my POST request. Endpoint: https://www.zohoapis.com/books/v3/creditnotes?organization_id=########## Body:     {

    • How to move emails to Shared Mailbox?

      Hello, I created a Shred Mailbox instead of using a distribution group. But I cannot move previous emails to certain shared mailbox. Is it possible move some emails from inbox to shared mailbox?

    • Collaboration with free plan user.

      Hello. Do both users need to be on Pro plan to collaborate? Or can a Pro user share a note with a free plan user with the ability to edit?

    • Zoho Inventory Now Supports VeriFactu for Businesses in Spain

      Starting from January 1, 2026, Spain requires real-time invoice reporting for all B2B transactions. From July 2026, this requirement will extend to B2C transactions as well. All reporting must be carried out through the VeriFactu to AEAT (Agencia Estatal

    • Connection to other user

      Zoho Cliq handles sharing of Custom OAuth Connections that require individual user logins.

    • Missing information data Zoho inventory

      there some missing data in Zoho inventory connection. pick list stock counts bin location we have requested it via mail and the support team doesn’t gove feedback. has anyone achieve to get these info or to ask other ya les

    • In arattai received message can't be deleted

      The issue has been noticed in following: arattai app (Android) arattai app (Window) arattai web While the message posted by me may be deleted, the ones received from others can't be. The item <Delete> change to <Report> when the message is a received

    • Analytics Portal

      I have the "standard plan" and want to explore the portal option; I activated the 15-day trial but do not see the pricing for the add-on. How can I get the price under "Upgrade add-ons." Thanks Rudy

    • Can I filter a Lookup field to only show related records from another Lookup in Zoho CRM?

      In our Leads module, we have two Lookup fields: Recruitment Agency – the agency that the lead came from Recruiter – the individual contact from that agency who sent us the lead Both fields link correctly to their respective records in CRM. However, our

    • Next Page