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!

    • 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

    • email moderation issue when email is sent in the name of a mail group

      Symptom: an email that is sent by a mail group moderator in the name of a moderated mail group is held back for approval. Reproduction: Create a moderated mail group with members and moderators. Allow that mails can be sent in the name of the group (extended

    • Pipeline in Custom Modules

      I love the way the Sales Pipeline looks and functions with reports. I would like to add the save pipeline features and visualization to a custom module, however, I only see that these pipelines are only available for the Deals module. Is there a way to add pipelines to custom modules?

    • Tip #53- Remote Billing: Your End-to-End Billing Solution in Zoho Assist- 'Insider Insights'

      Manual invoicing, after every remote support session, can be time-consuming and often error-prone. As an MSP, IT admin, or even a freelance support technician, it may become overwhelming to keep track of session time, service rates, and client invoices.

    • Record history and ticket interaction tab in contacts and accounts

      Hello everyone! We have improved the History tab to help users trace updates in the interaction activity logs of the Contacts and Accounts detail pages in the Customer Module. This enhancement make it easier to get clear details about who made each update,

    • Is there an API to "File a Ticket" in Desk

      Hi, Is there an API to "File a Ticket" in Desk to zoho projects?

    • Keyboard UX for Assemblies

      The new Assembly module has a counter-intuitive behavior that ought to be corrected. When an Assembly is ready to be entered, there are two options given, the blue-highlighted "Assemble" and the gray "Save as Draft". This correctly implies that the normal

    • Why can't I see images uploaded by other users in the Library for Campaigns

      We are several users of zoho Campaign. I have uploaded visuals of our company, but my team members can't see them.

    • zoho sheet stuck

      I Need help. ZOHO sheets stuck on the loading screen. I've already deleted the system cache and cookies of my browser (google chrome) but it's still not opening. 

    • Tip of the Week #78 – Cut response time with multichannel shared inboxes

      If you’ve ever felt your team juggling between multiple email accounts, social pages, and chat apps just to reply to customers, you’re not alone. Managing conversations in multiple channels can quickly turn messy. Important messages across inboxes, replies

    • Need a way to run a client script longet than 10 seconds

      By The Grace of G-D. Hi, Currently, Client Scripts are Timing out at 10 seconds. We have complex logics that needs more time. Can you add a feature request to increase the timeout?

    • FSM Improvement Idea - Show an Import button when there is no data

      I am setting up FSM for a client and I noticed that there is no option to import data, see screenshot below. Even when you click Create Contact there is only an option to Import from Zoho Invoice. It is only after you add at lease 1 record that the Import

    • UI Improvement - Ability to Collapse Flow

      The UI for Flow is generally pretty good. However, when multiple decision trees are used, the layout can get pretty convoluted and hard-to-follow (see one of my Flows below): In these cases, even the auto-arrange fails to make this something that a normal

    • Tasks Statuses

      Hi, The task status "Completed" is a final status which closes the task. We need to have a status "Cancelled". However, when the status is set to "Cancelled", the task prompt still has a blue button to Close Task. When the customer clicks that and closes

    • Add Lookup Field in Tasks Module

      Hello, I have a need to add a Lookup field in addition to the ones that are already there in the Tasks module. I've seen this thread and so understand that the reason lookup fields may not be part of it is that there are already links to the tables (

    • Create New Tasks Layout in CRM

      I am able to do this in Leads, Contacts, Meetings, Calls - every other module, but cannot create a new layout in tasks. I have the appropriate access but it's simply not appearing as an option. Only "Standard" option shows. Please help!

    • Using IMAP configuration for shared email inboxes

      Our customer service team utilizes shared email boxes to allow multiple people to view and handle incoming customer requests. For example, the customer sends an email to info@xxxx.com and multiple people can view it and handle the request. How can I configure

    • Auto-sync field of lookup value

      This feature has been requested many times in the discussion Field of Lookup Announcement and this post aims to track it separately. At the moment the value of a 'field of lookup' is a snapshot but once the parent lookup field is updated the values diverge.

    • Zoho Recruit Subscription

      Hello Zoho Recruit Team, Good day! I would like to inquire about your recruitment subscription plans and would also like to verify the current subscription our company is enrolled in under Zoho Recruit. Thank you, and I look forward to your response.

    • Automatic Portal invite

      We have numerous customers we move through a blueprint in deals, when they get to a certain point we need to give them portal access, how can this be done through deluge or a workflow? Latest Update (December 2025): The option to automate portal invitations

    • Marketer's Space: Why mobile optimization deserves a place in your email strategy

      Hello Marketers, Welcome back to Marketer's Space! Today, we'll talk about the importance of creating mobile-friendly email designs. While mobile phones were once used only to make phone calls, today they're used for almost everything, including texting,

    • Enhancements in Canvas

      Dear All, Greetings! Canvas lets you design the record details page to suit your brand or business preferences. We are glad to introduce the following enhancements to uplift your design experience. Reusable Components Style Presets Let's go! Reusable

    • 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

    • ABN with Legal Entity Name

      Hi, How can I execute this? The ABN number is entered in Accounts Module and ideally, it should display or suggest the correct Legal Entity Name based on the ABN lookup. ex. Account Name: JPG Resources ABN Number: 65 067 761 871 Legal Entity Name: (auto

    • Issue: Ticket Export Does Not Include Ticket Threads

      Dear Zoho Desk Support Team, I hope you’re doing well. I wanted to bring to your attention that the current ticket export feature in Zoho Desk does not seem to include the ticket threads or conversation history. When exporting tickets, only the summary

    • Pushover Notification Module

      Hello, it would be good if there would be a "Pushover" (https://pushover.net/) module besides the standard SMS module. Pushover is now very well known, especially in IT, and is becoming more and more popular. The biggest advantage are the customizable

    • Forward - no Ticket Number

      Hello, when I send an email to Zoho Desk via Reply or Reply All, the ticket number is in the subject line. But if I use forward then not. Is there an option to change this? We often forward e-mails and a reply to this will of course create a new ticket

    • Checkout: Adding Images

      Hello everyone, I’m trying to add a small GoGreen logo in the shipping section of the checkout to promote our sustainable shipping. While I can insert text without any issues, it seems that adding images is not supported in this area. Is there currently

    • [solved] #original_sender trick not working for us

      Hello community ! We really like DESK.. it's working like a charm for us but I have a request. Some users are sending emails personnaly to me (instead of using the support adress).. and I saw there was a possibilty to use : #original_sender {mail@mail.com}

    • SalesIQ Chat Notifications

      I am the admin of our salesIQ implementation. About two weeks ago, I started hearing/seeing notification for ALL chats messages from monitored agents/chat participants. I don't need to see these, we have a manager who deals with this. I can't stop the

    • Correlated subqueries not supported in Zoho Analytics. This creates huge limitations

      Running into a major limitation in Zoho Analytics: correlated subqueries simply don’t work, even in completely standard SQL patterns inside a JOIN. Example: LEFT JOIN "Bills" b ON d."Id" = b."Deal ID" AND EXISTS ( SELECT 1 FROM "Bill

    • Batch Emails in CRM Plus without using a template?

      Hi guys. Is it possible to send the same email to multiple people at the same time within CRM Plus without using an email template? At the moment we create a custom view in Contacts to display the people that we need. We then click the boxes on the left, and click 'Send Mail', but always need to select a template. Sometimes its better to write a quick one off message, without needing to set up a template first. Thanks.

    • bank charge

      a charge to my account was made that I did not authorize, of $16.46, for something that looks like "computer maintenance or something to that matter". please refund.

    • [Free Webinar] Product Updates: Quick Catch-Up Session - Part II - Creator Tech Connect

      Hello Everyone! We welcome you all to the upcoming free webinar on the Creator Tech Connect Series. The Creator Tech Connect series is a free monthly webinar featuring deep-dive technical sessions designed for developers, administrators, and app builders.

    • Introducing Liquid Glass UI on the Zoho Mail iOS app

      Hello everyone! We're excited to announce that the Zoho Mail app is now fully optimised for iOS 26's Liquid Glass design on both iPhone and iPad! The updated interface features transparent layers, smooth animations, and refined visual elements that enhance

    • Plan change from Zoho One to Zoho Workplace

      Hello Zoho, Following the recent pricing update for Zoho One, we are interested in transitioning to Zoho Workplace products. Please inform us about the necessary steps for this process so we can proceed promptly. Kind regards,

    • Links in Instagram

      Hi there, I have been using Later for a while now but keen to come back to Zoho Social as Later doesn't offer tagging of pages on Facebook but they offer something Zoho doesn't. You can add a link to your bio which opens up your profile feed where images

    • Spotlight #7 - Automatic Transitions in Blueprint

      Previously, records could not be moved from one state to another without user intervention. With automatic transitions, move records from one state to another automatically, when it elapses its pre-defined time. This Spotlight discusses how automatic

    • Sub Folders

      It would be great if there could be sub-folders in reports. We have a ton of individual reports and folders that would be easier to navigate this way 

    • Zoho CRM Community Digest - November 2025 | Part 2

      Hello Everyone! Second half of November brought several exciting updates, especially around Zia, making AI assistance smarter, faster, and more context-aware. We also feature engaging community snippets highlighting members who went the extra mile to

    • Zoho CRM - Writing Assistant Tone

      Hi Zoho CRM Team, Text in my emails often gets underlined in yellow because I tend to use a more informal tone with my client's, like using "I'm" instead of "I am". Is there some way for me to tell the system that this is my preferred writing tone, so

    • Next Page