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!


      Zoho Campaigns Resources


        • Desk Community Learning Series


        • Digest


        • Functions


        • Meetups


        • Kbase


        • Resources


        • Glossary


        • Desk Marketplace


        • MVP Corner


        • Word of the Day


        • Ask the Experts


          Zoho CRM Plus Resources

            Zoho Books Resources


              Zoho Subscriptions Resources

                Zoho Projects Resources


                  Zoho Sprints Resources


                    Zoho Orchestly Resources


                      Zoho Creator Resources


                        Zoho WorkDrive Resources



                          Zoho CRM Resources

                          • CRM Community Learning Series

                            CRM Community Learning Series


                          • Tips

                            Tips

                          • Functions

                            Functions

                          • Meetups

                            Meetups

                          • Kbase

                            Kbase

                          • Resources

                            Resources

                          • Digest

                            Digest

                          • CRM Marketplace

                            CRM Marketplace

                          • MVP Corner

                            MVP Corner




                            Zoho Writer Writer

                            Get Started. Write Away!

                            Writer is a powerful online word processor, designed for collaborative work.

                              Zoho CRM コンテンツ






                                ご検討中の方

                                  • Recent Topics

                                  • Enhancements to Zoho Meeting Annotator

                                    Hello Zoho Meeting Team, Hope you are doing well. We would like to share a few improvement suggestions regarding the Zoho Meeting Annotator used during screen sharing. While the current version provides helpful annotation tools, there are several limitations

                                  • Zoho Social/Marketing Plus - Addition to "Monitor" function

                                    It would be very helpful if the Monitor function would allow us to add a column to monitor hashtags in addition to pages and mentions. This is a common and very valuable function in other social listening tools.

                                  • Zoho forms - > Zoho desk multiple agents

                                    Hi! I would like to use a standard form to be used when we hiring people, so we looked at zoho forms for that. Now we would like to get that info in to Zoho desk and their different users shall take care of this ticket simultaneous . So, what would be

                                  • Almacenamiento

                                    Hola, Quisiera saber como podría hacer para bajar el almacenamiento de 5gb a mis usuarios, en otras palabras los quiero ir limitando de la cuota real, y luego ir agregando poco a poco la cantidad hasta llegar a los 5gb que me dan en el plan free. 

                                  • Zoho Invoice 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

                                  • Will I Get a Refund If I Downgrade Zoho Mail?

                                    Hello, We upgraded an email account for our new employee. However, the employee left after one month, and now I've reduced the number of Zoho Mail users from 7 to 6. Can we get a refund for the remaining portion of our annual payment?

                                  • Infinite loop of account verification

                                    Hi I can't do anything on my zoho account.  I always get this message Hi Sheriffo Ceesay As a security measure, you need to link your phone number with this account and verify it to proceed further. When ever I supply the details, it displays that the number is associated with another account. I don't have any other account on zoho so this is really annoying. 

                                  • Zoho Billing 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

                                  • Introducing the revamped What's New page

                                    Hello everyone! We're happy to announce that Zoho Campaigns' What's New page has undergone a complete revamp. We've bid the old page adieu after a long time and have introduced a new, sleeker-looking page. Without further ado, let's dive into the main

                                  • Zoho Books - France

                                    L’équipe de Zoho France reçoit régulièrement des questions sur la conformité de ses applications de finances (Zoho Books/ Zoho Invoice) pour le marché français. Voici quelques points pour clarifier la question : Zoho Books est un logiciel de comptabilité

                                  • Name autocomplete

                                    Hi, During searching emails the web tool does not always propose the auto-completion of the saved emails. As a result I either have to go to contacts and look up the exact email, or the exact full name including the middle name and any dots, which is very annoying. For example I have a contact that I emailed in the past that has "First M. Last" <email@email.com> type of contact. When I start typing 'First' the email may or may not pop up in the autocomplete menu. Then if I start typing "first last"

                                  • How do i follow up my email campaign in-thread

                                    Is there a way to follow up the email campaign so that it is in-thread using zoho campaigns? eg customer gets original email with subject line "hello" then 5 days later follow up would be with subject line "RE: hello".

                                  • Announcing new features in Trident for Mac (1.29.0)

                                    Hello everyone! Trident for macOS (v1.29.0) is here with new features and enhancements to enhance your business communication. Let's take a quick look at them. Access shared mailboxes. You can now view and access shared mailboxes in Trident, which are

                                  • Books is extremely slow again today !

                                    Everything is running slowly even with 500mb connection speed

                                  • Cyclic dependencies in many-to-many relationships...

                                    I have an application which includes a form for companies, and a form for contacts. Each company can be assigned 1 technical and 1 administrative contact. I have this working okay so far, but I want to copy the scripts used so far to a new empty application. When I import the scripts it fails with a message that says: Problem encountered while creating the application Error in resolving form dependency:Cyclic dependency among the forms:[Company, Contact] What can I do to resolve this? After all,

                                  • Zoho API to create ticket

                                    I'm developing an integration to create tickets via API, but, locally it works (send and recieve requests). In production it also works sending requests, but, my file don't recieve any response data. My URL is available in Zoho API Console and I have

                                  • Automate Timesheet Approvals with Multi-level Approval Rules

                                    Introducing Approval Rules for Timesheets in Zoho Projects. With this automation, teams can manage how timesheets are reviewed and approved by setting up rules with criteria and assigning approvers to handle submissions. Timesheet, when associated to

                                  • Labels Part 2

                                     Hey Zoho Mail Team, On the labels window on the left-hand pane, alphabetize label name display, rather than displaying in order created.  This one should be easy. Thanks, Drew

                                  • Building Toppings #1 - Serving your needs with Bigin Toppings

                                    Hey Biginners! We're excited to kick off our Developer Community series on building toppings for Bigin, and our goal is to provide an accessible, beginner-friendly, and relevant path for every developer. Imagine creating tiny pieces of software that unlock

                                  • Can we create Sprint with tasks from Multiple projects?

                                    Hi Team, We were using Zoho Sprints for quite sometime. Currently we have started the process of Sprint method. We couldnt create the active sprint board with the tasks from multiple projects. I would like to know whether this is possible or Any timeline

                                  • Tip of the Week #74– Create automated workflows in MS Power Automate

                                    Zoho TeamInbox now connects directly with Microsoft Power Automate, letting you streamline everyday routines tasks such as from sending emails to managing threads, with automated workflows. About the integration Zoho TeamInbox integrates with Microsoft

                                  • Account validation

                                    Hello everyone, I registered my account on ZeptoMail to use the system, but the problem is that the verification period on Zepto's end has already passed and I have limited functionality.

                                  • Paste issues in ZOHO crm notes

                                    Hi, since a week or so I have issues with the paste function in ZOHO CRM. I use "notes" to copy paste texts from Outlook emails and since a week or so, the pasting doesnt function as it should: some text just disappears and it gives a lot of empty lines/enters.....

                                  • Is it possible to add a gradient color to a newsletter im designing?

                                    From where i sit it looks like you can only choose a single color but not combine 2 colors?

                                  • New Feature: Audit Log in Zoho Bookings

                                    Greetings from the Zoho Bookings team! We’re excited to introduce Audit Log, a new feature designed to help you track all key actions related to your appointments. With Audit Log, you can maintain transparency, strengthen security, and ensure accountability.

                                  • Account disabled

                                    I have an issue I need help with. Whilst trialing ZOHO CRM I created the following: Account1 (-------------) using m__ame@m__rg___s__i__.___.__ and 2 personal emails Account2 (-------------) using a personal email and 2 users _al__1@______________._o_.__

                                  • Blocked Email

                                    We are a Zoho One subscriber and use Yahoo as our MX provider. A few times each year, for the past four years, CRM blocks one or more of my Zoho One users from receiving internal email from CRM. This includes "@mentions" in all modules, and emails from

                                  • message var is empty in bot mention handler

                                    Hi, I'm encountering a problem: in my bot's mention handler, I want to retrieve the text the user typed when mentioning the bot. Example: On the #tests-cyril channel, I send this message: “@Donna hello how are you ?” I expect the system variable "message"

                                  • Remembrance Day to Remember – Recalling Values

                                    The phrase “at the eleventh hour” refers to the 11th hour of the 11th day of the 11th month in 1918, when the hostilities of World War I came to an end—but it still holds meaning today. Remembrance Day (Veterans Day in the US) is observed on November

                                  • Enhancing Zia's service with better contextual responses and article generation

                                    Hello everyone, We are enhancing Zia's Generative AI service to make your support experience smarter. Here's how: Increased accuracy with Qwen One of the key challenges in AI is delivering responses that are both contextually accurate and empathetic while

                                  • How to display two measures (sales and price) divided by categories on one line chart

                                    Hi everyone, I’m having trouble figuring out how to display two columns on a line chart with category breakdowns. What I need is a line chart where one line represents Sales and the other represents Price. However, the Price data is divided into around

                                  • Create custom rollup summary fields in Zoho CRM

                                    Hello everyone, In Zoho CRM, rollup summary fields have been essential tools for summarizing data across related records and enabling users to gain quick insights without having to jump across modules. Previously, only predefined summary functions were

                                  • Introducing the locking option for CRM records

                                    Last modified on 06/04/2023: Record locking option in CRM is now available for all Zoho CRM users in all DCs. Note that it was an early access feature available only upon request. Hello All, Hope you're doing well! We're thrilled to introduce our latest

                                  • Two new enhancements in Zoho CRM: Introducing new criteria for user fields and displaying group information in users page

                                    Announcement moderated on 14th June, 2023. Dear All, These enhancements are opened for all users in all DCs. ------------------------------------------------------------------------------------- Dear All, Hope you're well! We are here with two useful

                                  • Tip #49- Navigating the Remote Support Dashboard in Zoho Assist- 'Insider Insights'

                                    The Remote Support dashboard in Zoho Assist is designed to help technicians quickly access, manage, and monitor all their support sessions from a single, intuitive interface. Whether you’re starting a new session, managing ongoing connections, or reviewing

                                  • BMI formula

                                    I've been trying for hours to calculate BMI using height and weight as my only inputs. It's a simple calculation and I even went to ChatGPT to help me figure this out in Zoho Forms, but it led me down a path of "try this" and "try this". None of my attempts

                                  • SEO on blogs

                                    Hello, google is not able to find my blogs. Can you advice me if I need to change some settings or anything else to make it retrievable via SEO many thanks, hans

                                  • Duplicated Notebooks

                                    Out of the blue, almost all of my notebooks got duplicated and the different copies contain different information. Some seem like older copies than the others. I use the linux desktop app and sometimes the Android app. I assume that the sync failed at some point and was unable to merge the two versions together. But I'm afraid to add anything else to my notebook because if it can't properly sync 5 notebooks with only a handful of notes each, what will happen when I have hundreds of notes and I lose

                                  • Mind mapping in Zoho Projects

                                    Good morning,   I would like to congratulate the Zoho team for building such an inovative and responsive application that fits in the daily challenges of so many work groups. I would like suggest you another functionality that helps a lot in project planning and development: mind mapping. Mind mapping would be of great help for brianstorming, knowledge management and other needs in online collaboration.   Thanks and wish you all the best! George Maha Empresa Júnior Multidisciplinar do Instituto de

                                  • Retainer invoice in Zoho Finance modlue

                                    Hello, Is there a way of creating retainer invoices in the Zoho Finance module? If not can I request this is considered for future updates please.

                                  • Next Page