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

    • Customize Colors used on graphs and charts according to users desire.

      It would be great if we could customize the graph's colors as we see fit. I hate that yellow is always the default color!

    • Let us view and export the full price books data from CRM

      I quote out of CRM, some of my clients have specialised pricing for specific products - therefore we use Price Books to manage these special prices. I can only see the breakdown of the products listed in the price book and the specialised pricing for

    • Mejoras urgentes para ZOHO MEETING

      Tengo unos meses usando Zoho Meeting. En general, es buena, pero hay cosas vitales que no logra cumplir con mínima calidad. 1) Calidad de audio y video: urge mejoras. Audio con retraso, imagen borrosa, mal recorte de silueta con fondos virtuales. Además,

    • Multiple header in the quote table???

      Hello, Is it possible in Zoho CRM to add multiple headers or sections within the Quote product table, so that when the quote is printed it shows separate sections (for example “Products” and “Services”)? To clarify, I’m asking because: This does not appear

    • Saving sent email campaign as PDF

      I'm looking to add all campaigns sent to an archive folder in sharepoint. Is there anyway to accomplish this in Zoho Flow ? I'm falling at the first hurdle ... can I automatically save a sent campaign as a PDF to a folder location ?

    • Exporting All Custom Functions in ZohoCRM

      Hello, All I've been looking for a way to keep about 30 functions that I have written in Zoho CRM updated in my own repository to use elsewhere in other instances. A github integration would be great, but a way to export all custom functions or any way

    • How can Data Enrichment be automatically triggered when a new Lead is created in Zoho CRM?

      Hi, I have a pipeline where a Lead is created automatically through the Zoho API and I've been trying to look for a way to automatically apply Data Enrichment on this created lead. 1) I did not find any way to do this through the Zoho API; it seems like

    • Conditional Layouts On Multi Select Field

      How we can use Conditional Layouts On Multi Select Field field? Please help.

    • Appreciation to Qntrl Support Team

      We are writing this topic to appreciate the outstanding level of support from Qntrl Team. We have been using Qntrl since 2022 after shifting from another similar platform. Since we joined Qntrl, the team has shown a high level of professionalism, support,

    • How can I hide "My Requests" and "Marketplace" icon from the side menu

      Hello everybody, We recently started using the new Zoho CRM for Everyone. How can I hide "My Requests" and "Marketplace" from the side menu? We don't use these features at the moment, and I couldn't find a way to disable or remove them. Best regards,

    • Timesheet invalid data error

      Getting the "Invalid Date" error when trying to add a time sheet to an appointment in a work order. I initially though the work order was corrupt or something so I deleted the work order and recreated it. I added the first time sheet to the AP and saved

    • 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

    • Mandatory Field - but only at conversion

      Hello! We use Zoho CRM and there are times where the "Lead Created Date & Time" field isn't populated into a "Contractor" (Account is the default phrase i believe). Most of my lead tracking is based on reading the Lead Created field above, so it's important

    • Different Task Layouts for Subtasks

      I was wondering how it would be possible for a subtask to have a different task layout to the parent task.

    • Enable Free External Collaboration on Notecards in Zoho Notebook

      Hi Zoho Notebook Team, I would like to suggest a feature enhancement regarding external collaboration in Zoho Notebook. Currently, we can share notes with external users, and they are able to view the content without any issue. However, when these external

    • Using data fields in Zoho Show presentations to extract key numbers from Zia insights based on a report created

      Is it possible to use data fields in Zoho Show presentations along with Zoho Analytics to extract key numbers from Zia insights based on a report created? For example, using this text below: (note that the numbers in bold would be from Zia Insights) Revenue

    • Free webinar: AI-powered agreement management with Zoho Sign

      Hi there! Does preparing an agreement feel like more work than actually signing it? You're definitely not alone. Between drafting the document, managing revisions, securing internal approvals, and rereading clauses to make sure everything still reflects

    • WhatsApp Channels in Zoho Campaigns

      Now that Meta has opened WhatsApp Channels globally, will you add it to Zoho Campaigns? It's another top channel for marketing communications as email and SMS. Thanks.

    • CRM For Everyone - Bring Back Settings Tile View

      I've been using CRM for Everyone since it was in early access and I just can't stand the single list settings menu down the left-hand side. It takes so much longer to find the setting I need. Please give users the option to make the old sytle tile view

    • Lets have Dynamics 365 integration with Zohobooks

      Lets have Dynamics 365 integration with Zohobooks

    • Add notes in spreadsheet view

      It would be great if we could Add/edit notes in the spreadsheet view of contacts/leads. This would enable my sales teams to greatly increase their number of calls. Also viewing the most recent note in the Contact module would also be helpful.

    • Opening balances - Accounts Receivable and Payable

      Our accounting year starts on 1st August 2013 and I have a Trial Balance as at that date, including Accounts Receivableand Accounts Payable balances, broken down by each customer and supplier. Q1 - do I show my opening balance date as 31st July 2013 or

    • Announcing Kiosk 1.1 - Customize screen titles, configure new fields & actions, use values from your Kiosk to update fields, and more.

      Hello all We are back again with more enhancements to Kiosk. So what's new? Enhancements made to the Components Add titles for your Kiosk screens and adjust its width to suit your viewing preferences. Three new fields can be added to your screen: Percentage,

    • Limited System because of Limited Number of Fields for Car Dealership

      Dear Zoho Support, we want to have all the information about a car inside of a car record. We want to have Zoho CRM as our single source of truth for our data, but the limited number of fields are not allowing that. The data consist of: technical data

    • Cancel Subscription

      Hi , Im want to cancel my account but without success please help me to do it

    • Making an email campaign into a Template

      I used a Zoho Campaign Template to create an email. Now I want to use this email and make it a new template, but this seems to be not possible. Am I missing something?

    • Direct Access and Better Search for Zoho Quartz Recordings

      Hi Zoho Team, We would like to request a few enhancements to improve how Zoho Quartz recordings are accessed and managed after being submitted to Zoho Support. Current Limitation: After submitting a Quartz recording, the related Zoho Support ticket displays

    • Multiple Cover Letters

      We are using the staffing firm edition of Recruit and we have noticed that candidates cannot add more than one cover letter. This is a problem as they might be applying for multiple jobs on our career site and when we submit their application to a client,

    • URGENT: Deluge issue with Arabic text Inbox

      Dear Deluge Support, We are facing an issue that started on 12/Feb/2026 with custom functions written using Deluge within Qntrl platform. Currently, custom functions do not accept Arabic content; it is replaced with (???) characters. Scenario 1: If we

    • File Conversion from PDF to JPG/PNG

      Hi, I have a question did  anyone every tried using custom function to convert a PDF file to JPG/PNG format? Any possibility by using the custom function to achieve this within zoho apps.  I do know there are many third parties API provide this with

    • Now in Zoho One: Orchestrate customer journeys across apps with Zoho CommandCenter

      Hello Zoho One Community! We’re excited to introduce Zoho CommandCenter as a new capability available in Zoho One. For the whole customer journey As Zoho One customers adopt more apps across sales, marketing, finance, and support, a common challenge emerges:

    • annualy customer report

      we need a report per customer that looks like this invoic number cleaning laundry repair management 01 january xxx euro xx euro xx euro xxx euro 02 february xxx euro xxx euro x euro xxxx euro and so on the years 12 months is that possible to make and

    • Totals for Sales Tax Report

      On the sales tax report, the column totals aren't shown for any column other than Total Tax. I can't think of a good reason that they shouldn't be included for the other columns, as well. It would help me with my returns, for sure. It seems ludicrous

    • Free Webinar: Zoho Sign for Zoho Projects: Automate tasks and approvals with e-signatures

      Hi there! Handling multiple projects at once? Zoho Projects is your solution for automated and streamlined project management, and with the Zoho Sign extension, you can sign, send, and manage digital paperwork directly from your project workspace. Join

    • Exported Report File Name

      Hi, We often export reports for information. It is time consuming to rename all the reports we export on a weekly basis, as when exported their default name is a seemingly random string of numbers. These numbers may be important, I'm not sure, but I am

    • Automatic Refresh on Page?

      Hi everyone, We use a page as a dashboard which shows data for the laboratory and tasks pending etc. Is there a way to set the page to automatically refresh on a X time? Many thanks TOG

    • How do I edit the Calendar Invite notifications for Interviews in Recruit?

      I'm setting up the Zoho Recruit Interview Calendar system but there's some notifications I don't have any control over. I've turned off all Workflows and Automations related to the Calendar Scheduling and it seems that it's the notification that is sent

    • Add RTL and Hebrew Support for Candidate Portal (and Other Zoho Recruit Portals)

      Dear Zoho Recruit Team, I hope you're doing well. We would like to request the ability to set the Candidate Portal to be Right-to-Left (RTL) and in Hebrew, similar to the existing functionality for the Career Site. Currently, when we set the Career Site

    • App for Mac OS X please!

      It would be awesome to have a mail app for Mac OS X that included all the cool features such as steams, calendar, tasks, contacts, etc. Most people prefer native apps, rather than running it through a web browser. I know that we can use the IMAP, CalDAV,

    • How to integrate Zoho CRM, Zoho Forms and a WIX Web Site

      Attached video demonstrates how to use Zoho Forms included in Zoho One, to design a Contact Us form to be embedded into a WIX web site and integrated into Zoho CRM.

    • Next Page