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

    • Insurance Agencies

      I am reaching out to see if anyone has any experience in the Insurance Agency world with using Zoho exclusively for the CRM and commissions side of things. Lots of strong features like drip campaigns, meeting, calendars, emails, can all be found in here.

    • Problem with Egyptian internet ISP

      Dears,  We have problem with our ADSL internet SP, That your site not working with. So, we contact them and they asking us to contact you to solve this problem.  The problem that when we are connecting to Tedata ADSL your website not working (Business Email).  BR,, Mohamed Omar 

    • 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

    • Mail Not Showing In Inbox or Sent Box

      Hi, there are mails that are not displaying in both my inbox and sent box. I just tried the iPad app and it is the same but there is a blank field where a mail should be and it refers to a server error. Please fix this.

    • Marketing Automation List Entry Criteria is no longer an option

      For a couple of years now we have used the "List Entry Criteria" option to filter our Journey recipient list. All of a suddent the option no longer exists for New Lists and I can only delete the option from existing lists but can no longer edit it. Anyone

    • GCLID arrives not in CRM with iframe integrated ZOHO Form

      Hello amazing community, I enabled Adwords integration in ZOHO CRM. I have a ZOHO Form integrated in a wordpress. I tested iframe and Javascript. I enabled the "handover" GCLID in the ZOHO Form. When I add a GLID with http://www.example.com/?gclid=TeSter-123.

    • Add Webhook Response Module to Zoho Flow

      Hi Zoho Flow Team, We’d like to request a Webhook Response capability for Zoho Flow that can return a dynamic, computed reply to the original webhook caller after / during the flow runs. What exists today Zoho Flow’s webhook trigger can send custom acknowledgements

    • Bidirectional sync between Zoho Bookings and Zoho CRM - Part 1

      Hey, community members! The default integration between Zoho CRM and Zoho Bookings is unidirectional, which means that any appointments booked, rescheduled, or deleted in Zoho Bookings will be reflected in Zoho CRM. However, any modifications made to

    • Is it possible to edit placeholder text?

      In the master slides I want to make sure my templates have more meaning for the users and want to replace the standard placeholder text with something more instructional. Instead of "Click to edit Mast subtitle styles" I want to have "Click to enter reporting

    • Delay function execute

      I've got a workflow which uses a webhook to send information to Flow, which in return updates a record in Creator. Problem is, by the time this has executed, the rest of my script has run and can't find the (yet to be) updated info in the record. Is there

    • How to allow download of a file AFTER information is collected?

      I can't find this anywhere. Can someone help with what seems to be a pretty basic web function today? - File is stored in Workdrive - Prospect goes to a URL where the file is located - System requests prospect to enter "Name" and "Email" - An email is

    • Add Baseline methods to API

      There are no API methods for creating or querying baselines,  Use case: Customer is notified of the current project start date according to plan via another product/integration. We would like to auto create a baseline (Automated via API) at the point

    • Bulk Fill In & Edit PO/Bill/SO/Invoice

      Hello, I am adding stock in bulk on a PO, the system is automatically populating the Rate (price) and Tax from the item data. Problem is that the bill rate is different from the rate on the item data, so I have to manually erase each and enter the price.

    • Fixed Assets beg balance

      Hello, I trust you are well I'm a new zoho books user and I find it difficult to plug in the fixed assets balance and here's what I have done: 1- I imported the fixed assets data into the fixed assets module as per the instructions 2- the import process

    • Syncing with Google calendar, Tasks and Events

      Is it possible to sync Zoho CRM calendar, task and events with Google Calendar's tasks and events. With the increasing adoption by many major tool suppliers to sync seamlessly with Google's offerings (for instance I use the excellent Any.do task planning

    • CRM Deluge how can link attach file with workdrive file.

      Hi, We have create file at workdrive and would like to link to attachment at crm module by deluge. Right now can only upload it to attachment but can not link the file from workdrive. Thank you

    • Feature announcement: AI-powered document generator in Zoho Sign

      Hi there! We recently announced manual document creation by offering an editor within Zoho Sign. Today, we are excited to announce AI-powered document generation to help you draft agreements, purchase orders, and other important business documents in

    • Permanently deleted files

      Is there a way to get back permanently deleted files from your account if they were accidentally deleted and no longer recoverable from the recycling bin? I know I am probably screwed but I just figured I would ask.

    • Shared Mailbox in iOS app

      Hi, On the desktop I am using a Shared mailbox for our company's general mailbox that somebody else should be able to view. In the iOS app however I can't find it? Old sources on the internet says this isn't possible but that can't be right? Somebody

    • Tip #41- Simplify Compliance and Efficiency with Zoho Assist’s Data Cleanup Feature- 'Insider Insights'

      Managing device data efficiently is just as important as securing remote access. With Zoho Assist’s Data Cleanup feature, admins can easily remove outdated or unnecessary device records, keeping the console organized and secure. This action is carried

    • Revenue Management: #6 Revenue Recognition in Professional Services Industry

      If you run a consulting firm, agency, or any service-based business, you have a situation where you have signed the contract, maybe even sent the invoice, and have received some initial payments. So, can you consider this as revenue? What if the project

    • Zoho fsm scheduled maintenance dispatch

      Hi, I'm reaching out regarding an issue I'm encountering with the Scheduled Maintenance feature in Zoho FSM. I’m trying to configure it so that it automatically dispatches all maintenance jobs scheduled within the next 150 days, starting from today. However,

    • zoho.inventory.getRecords returns no records

      I running a custom function (Deluge) in Zoho Flow with a connection to Zoho Inventory. To debug the problem, I created the test function below. It returns "Number of contacts fetched: 0". This confirms that there's no issue with the org ID or connection

    • Feature announcement - Simplifying document creation with Zoho Sign

      Hi there, We are pleased to announce the release of our document creation feature, enabling you to create, edit, and finalize documents like agreements, purchase orders, and contracts without relying on external tools or applications. <br> This

    • Integrating File Attachments in Zoho Flow Email Notifications

      Hi, I would like to be able to send an email once an entry is made in a form, and in this email, I would like to attach a file that has been added to the form using the ImageUpload (or FileUpload) widget. So, I started by creating a flow that will trigger

    • Zoho project purchases

      Hi Folks, I think having a purchase module in projects will help in putting together a project p and L. Project wise purchases and expenses.  Do let me know your thoughts.

    • Create Tasklist with Tasklist Template using API v3

      In the old API, we could mention the parameter 'task_template_id' when creating a tasklist via API to apply a tasklist template: https://www.zoho.com/projects/help/rest-api/tasklists-api.html#create-tasklist In API v3 there does not seem to be a way to

    • How can I restore all the deleted Time entries of a Task in Zoho Projects

      How can I restore all the deleted Time entries of a Task in Zoho Projects? Query: In Zoho Projects, I cloned a task and deleted the time entries from the cloned task. However, this also deleted the time entries from the original task. How can I restore

    • Is there a way to make an account inactive in ZoHo Desk

      We have a few Clients "Accounts" that we no longer do business with. It would be beneficial for them to not show up in lists. However, we want to go back and view tickets, time, etc.

    • How to set the value of the Phone field importing contacts in Zoho Desk

      Hi everyone, i'm new in Zoho Desk, we're setting up the environment and i'm importing contacts from another CRM using a file CSV and i'm getting a problem with phone numbers (italian): the leading zero is cut away, also if the value is inside double quotes.

    • Set Custom Icon for Custom Modules in new Zoho CRM UI

    • Deprecation Notice: OpenAI Assistants API will be shut down on August 26, 2026

      I recieved this email from openAI what does it means for us that are using the integration and what should we do? Earlier this year, we shared our plan to deprecate the Assistants API once the Responses API reached feature parity. With the launch of Conversations,

    • How to center a field inside a section?

      I’ve been trying to center a field inside a section in Zoho Canvas. When I align it visually, it looks centered in the editor, but after clicking Save, the field appears misaligned on the actual canvas. I also tried setting the field to full width, but

    • Kaizen #192 - Implementing Custom Token Persistence in Python SDK

      Welcome back to another week of Kaizen! Last week, we discussed how to implement Login with Zoho using OAuth 2.0 and saw how to bring it to life in a real-world application with the Zoho CRM Python SDK. We also discussed how Zylker Academy built a custom

    • Showing the map along with mileage expense

      When you use the GPS to track mileage, it shows you the map of the actual path travelled. It would be very useful and practical to save that map with the mileage expense, so that when the report is created, it provides a map of each mileage expense associated

    • Enable Validation Rule for Multi-Select Picklist Field

      Zoho, Please allow validation rules for multi-select fields.

    • File Upload field not showing in workflow

      Hi, I have added a field on Zoho CRM. I want to use it in a workflow where that particular field is updated based on another field, however it is not showing up in the field list to select it in the workflow. Why is this please?

    • CRM Custom function updating a module record shows the Super Admin user as the record modifier

      Dear Zoho CRM Team, Is there any way to update this so that when a custom function has updated a record the Super Admin user doesn't become the modifier? This happens on the record as a modifier and shows up in the audit logs. It would be more useful

    • Best practice importing items and matching assemblies

      Hi, I was wondering what would be the best practice to import items and composite items (assemblies) From my backup, what should I import first? The items or the composite items? I am on Zoho one, using inventory and books. Kind regards, Sabine

    • Best way to fetch employee names from Zoho People into Zoho Creator Inventory Stock Form field Employee Name Lookup

      Hi Team, I have a requirement in my Zoho Creator application (Inventory Stock Adjustment) where I need to fetch employee names from Zoho People and use them as a lookup in a form. Currently, I am considering using an integration field to fetch this data

    • Next Page