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

    Nederlandse Hulpbronnen


      • Recent Topics

      • Global Search Settings

        I'd love a way to remove some modules from being included in the global search. This would allow use to provide a better user experience, limiting the global search to only those modules that are regularly used removing any models used for background

      • Card Location in Zobot

        Hello, when using the “Location” card in a codeless builder Zobot, the behavior in WhatsApp is inconsistent. When asking the user to share their location, they can type a message, which will return the message “Sorry, the entered location is invalid.

      • Automation Series: Auto-create Dependent Task on Status Change

        In Zoho Projects, you can automatically create and assign a dependent task when a task’s status is updated. This helps teams stay aligned, ensures reviews happen on time, and reduces manual effort. In this post, we’ll walk through an easy setup using

      • Languages in Zobot

        Hello, I have found a list of supported languages for the Zobot. The information specifies the languages are supported in the following 3 features: SalesIQ supports 34 different languages in the following features. Resources (Articles, FAQs, Small Talks)

      • Composite items inside of composite items; bill of materials needed

        Hi Zoho and Everyone, I am evaluating whether Zoho Inventory will work for my small business. I grow and harvest herbs and spices but also get from wholesalers. I use all these items to make herbal teas, but also sell them as individual items on my Shopify store and Etsy. I discovered the composite item bundling and am wondering if I could get some assistance since there is no bill of materials: Our herbal company's best selling tea is a sleepytime tea. Sleepytime Tea can be purchased in three weights

      • Action required: Reauthorizing your Google account in Zoho Sign for automatic cloud backup to Google Drive

        This is applicable to users who have already configured automatic cloud backup to Google Drive. Hi there! Google has mandated reauthorization of all preconfigured third-party integrations to ensure only the necessary scopes are shared as an improved security

      • Zoho CRM Layouts

        I have customised all our modules, Leads, Contacts and deals, and within them, I have created lots of different layouts depending on the type of Lead or contact, for example. Since the new Zoho UI came out, they have all disappeared. I have gone into

      • Streamlining E-commerce Photography with AI Background Tools

        Hey Zoho Community, I’ve been messing around with ways to make product images less of a headache for fashion brands on Zoho Commerce. You know how boring generic backdrops can get, and how much time traditional photoshoots eat up, right? I tried out this

      • WhatsApp IM in Zoho Desk always routes to Admin instead of assigned agent

        Hello Zoho Experts, I connected WhatsApp IM to my Zoho Desk account. I only assigned my Customer Service (CS) agent to the WhatsApp channel, and I did NOT include Admin in this channel. However, every new WhatsApp conversation automatically gets assigned

      • hide resolution from help centre

        to my surprise, i just found out that the resolution text is public in the helpcenter, even if 'notify customer' is off. is there a workaround to that? how do others deal with this? How zoho support does this and I don't think its used by Zoho in the first place. the resolution is meant to be private, not public

      • Zoho Analytics + Facebook Ads: Performance Alerts for Active Campaigns

        Is it possible with integration of Zoho Analytics with Facebook Ads and set up alerts or notifications for active campaigns when performance drops? For example, triggering a notification if CTR goes below a defined threshold or if other key metrics (like

      • Multiple upload field CRM

        I desperately need the functionality to add more than one upload field to web to contacts form. How can I do this?

      • Sort by age

        It would be very helpful if there was a way to sort by age in the Age column. Please add this function if possible. Thanks!

      • Lookup Field Option Not Available in Customization

        Hello, I am trying to customize different modules (e.g., Work Orders, Systems, and others), but I am unable to find the Lookup field option in the layout customization. When I go to: Setup → Customization → Modules and Fields → Add Field The Lookup field

      • Scheduled sending of a poll and its results

        Is there a way to schedule sending a poll to all my users and have the results sent separately to the team?

      • Canvas View bug

        I would like to report a bug. When clone a canvas view from an existing canvas view, if the original canvas view have canvas button with client script. Then the new create canvas view will have canvas button, it is make sense. But when I try to delete

      • Integrating Zoho Suite and apps more with Linux

        I just got introduced with Zoho just couple of months ago, and I've already planned to contribute to it, even though it's not an open-source software. Still I have found it's potential to beat the tech giants and still being respective towards data privacy

      • Store Submitted Forms as PDF

        Hi there, Is there a method to store Form submissions as a PDF in workdrive for archival? I set the form to email the submission to the user and an internal inbox but I'd really love to store the final form as PDF in workdrive automatically. I can't seem

      • System Components menu not available for Tablet to select language

        I have attached a screenshot of my desktop, mobile and tablet menu builder options. I am using 2 languages in my application. Language Selection is an option under the System Components part of the menu, but only for my desktop and phone(mobile). My tablet

      • Separate Items & Services

        Hi, please separate items and services into different categories. Thank you

      • CRM->INVENTORY, sync products as composite items

        We have a product team working in the CRM, as it’s more convenient than using Books or Inventory—especially with features like Blueprints being available. Once a product reaches a certain stage, it needs to become visible in Inventory. To achieve this,

      • Add an option to disable ZIA suggestions

        Currently, ZIA in Zoho Inventory automatically provides suggestions, such as sending order confirmation emails. However, there is no way to disable this feature. In our case, orders are automatically created by customers, and we’ve built a custom workflow

      • What's new in Zoho Sheet: Simplify data entry and collaboration

        Hello, Zoho Sheet community! Last year, our team was focused on research and development so we could deliver updates that enhance your spreadsheet experience. This year, we’re excited to deliver those enhancements—but we'll be rolling them out incrementally

      • Zoho Creator Developer Console | Improved Distribution and Lifecycle Management for apps

        Hello everyone, We're excited to introduce new enhancements now in the Zoho Creator Developer Console. These updates strengthen private app distribution through licensing controls and extend environment support across all installed apps, helping teams

      • [Webinar] Solving business challenges- Handling the challenge of transitioning to Zoho Writer from legacy tools

        Moving to Zoho Writer is a great way to consolidate your business tools and become more agile. With multiple accessibility modes, no-code automation, and extensive integration with business apps and content platforms, Zoho Writer helps solve your organization's

      • Feature Request - Gift Cards or Gift Voucher Capability in Zoho Commerce

        Hi Zoho Commerce team, I'm comming accross more and more retail businesses who sell gift cards. As there is currently no way to manage this in Zoho Commerce, it is a blocker to addoption. This is particularly popular in Europe and North America. I recently

      • Highlight a candidate who is "off limits"

        Hello: Is there a way to highlight a candidate who is "off limits"?  I would like to have the ability to make certain candidate and / or Client records highlighted in RED or something like that.   This would be used for example when we may have placed a candidate somewhere and we want everyone in our company to quickly and easily see that they are off limits.  The same would apply when we want to put a client or former client off limits so no one recruits out of there. How can this be done? Cheers,

      • Closing off tasks automatically based on project status

        Is there a way to close off all open tasks when a project is set as Cancelled?

      • [Free webinar] Understanding connections and datasources in Zoho Creator - Creator Tech Connect

        Hello everyone, We’re excited to invite you to another edition of the Creator Tech Connect webinar. About Creator Tech Connect The Creator Tech Connect series is a free monthly webinar featuring in-depth technical sessions designed for developers, administrators,

      • Bridge the Gap Between your Service and Finance Teams

        In field service, the most expensive distance isn’t the drive to a customer’s home—it’s the gap between a finished job and a paid invoice. Zoho FSM leverages the power of Zoho Invoice to handle and manage billing operations. It enables you to: Instantly

      • Direct URL to "View Record"

        I would like to create a button (Deluge Script) to jump to the "view record" without passing by the record menu, but I can not aford to find the right url. I don't want the "view record" as a single page. I want the "view record" in the application like the picture below: Thanks in advance for your help

      • Live Chat for user

        Hi everyone, I’m new to Zoho Creator and wanted to ask if it’s possible to add a live chat option for all logged-in portal users so they can chat internally. I’m trying to create a customer portal similar to a service desk, but for vehicle breakdowns,

      • SalesIQ Chat Owner to CRM Lead Owner Mapping

        There is no proper mapping between the SalesIQ chat owner and the CRM lead owner. When a chat is assigned to an agent, the lead created in CRM is often assigned to a different user, forcing admins to manually change ownership every time. This creates

      • Product line search in quotes

        Is there a way to change the search setting when you add a product line to a quote. We have created a field in products called 'Part Number' and I would like when I'm adding a product line to the quote that I can search on that field. At the moment it only searches on product description. In products I can search on the 'Part Number' field Any help welcome.

      • 🚀 WorkDrive 6.0 (Phase 1): Empowering Teams with Content Intelligence, Automation, Accessibility, and Control

        Hello, everyone! WorkDrive continues to evolve from a robust file management solution into an intelligent, secure, and connected content collaboration platform for modern businesses. Our goal remains unchanged: to simplify teamwork, strengthen data security,

      • Storage Limits

        Hello, What is the storage limitations for each user on professional edition?  Thanks, Mekki

      • Zoho Recruit Community Meetup - London 🇬🇧

        Hello Recruiters! We’re excited to announce that the Zoho Recruit team is coming to the UK for an in-person Zoho User Group (ZUG) Meetup in London! This is your chance to connect with fellow Zoho users, learn from experts, and walk away with actionable

      • Power Pivot and Data Modeling functionality in Zoho Sheet

        When will MS Excel functionalities like Power Pivot and Data Modeling functionalities be available in Zoho Sheet?

      • Global Search placement in the new UI

        Having a hard time with the global search placement in the UI redesign. Surely I can't be the only one. Previously global search placement was perfect. A bar at the top/center of the page. Exactly where you would expect it to be. Since the new UI has

      • What's New - January 2026 | Zoho Backstage

        Welcome to 2026! If you thought last year was big, buckle up. We’re stepping into this year with a singular focus: unimaginable growth, elite scalability, and performance benchmarks that leave the old ways of event management in the rearview mirror. As

      • Next Page