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


          • Sticky Posts

          • Kaizen #197: Frequently Asked Questions on GraphQL APIs

            🎊 Nearing 200th Kaizen Post – We want to hear from you! 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 #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.

          • Celebrating 200 posts of Kaizen! Share your ideas for the milestone post

            Hello Developers, We launched the Kaizen series in 2019 to share helpful content to support your Zoho CRM development journey. Staying true to its spirit—Kaizen Series: Continuous Improvement for Developer Experience—we've shared everything from FAQs

          • Kaizen #193: Creating different fields in Zoho CRM through API

            🎊 Nearing 200th Kaizen Post – We want to hear from you! 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.

          • Client Script | Update - Introducing Commands in Client Script!

            Have you ever wished you could trigger Client Script from contexts other than just the supported pages and events? Have you ever wanted to leverage the advantage of Client Script at your finger tip? Discover the power of Client Script - Commands! Commands

          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

                                  • Zoho Books Reports: Basic report with total items sold and Cost of goods sold

                                    How can books show a report with Item Name || Qty Sold || Total Revenue || Total Cost of Goods Sold || Margin I need to factor in also invoices that have been credited where customers returned good. This seems like such a basic report, I'm sure I'm missing

                                  • The amount entered is more than the balance due for the selected bills."

                                    Hi Team i am trying to record payments for vendors using API and getting this error in response as { "code": 28011, "message": "The amount entered is more than the balance due for the selected bills." } JSON is prepared according to Documentation and

                                  • VBA handling named ranges

                                    In VBA I'm able to work with a single cell named range. E.g. Set Jr = Range ("Year").Value. Also other options are working fine, like Range("Year").Address shows $L$3. However a named range refering to multiple cells is not working for me. Eg. tbl_Test

                                  • Kaizen #176 - Optimizing the Use of Record ID Variables in Zoho CRM Queries

                                    Hello everyone! Welcome to another week of Kaizen! Since the release of Queries, we have covered Handling Query Variables in Zoho CRM, Serialization and Schema Management, and Leveraging the 'crmAPIResponse' object in Queries in previous posts. Today,

                                  • Unbilled Items Report?

                                    Hello! Is there any way to display a list of items that remain unbilled, without creating an invoice for each customer to see if the unbilled items box is displayed? ;-) Ben

                                  • Consolidation of Multi currency

                                    Would like to discuss on the possibility of consolidating the ZOHO companies

                                  • Landed Cost Allocation / Custom Duty manual data entry

                                    My client is an import business. They must manually enter the duty for each item with landed cost allocation in Bill. This is because customs duties cannot be allocated based on Quantity, Value, Weight, and Dimensions. Manual data entry is highly time-consuming

                                  • Territories Just Don't Work

                                    I have been on chat and screenshare support for the past 3 days and am getting no resolution so hopefully, someone here can help me. I am the Super Admin of my organization. We publish books globally. I want to break down the books into territories so

                                  • Negative Opening Balance

                                    How can I add Negative Opening balance - meaning a credit balance to a Customer or a debit balance to a vendor? If I go thru Sales-->Customers, and if the opening balance is Rs. 1000 (credit balance), it does not allow me to enter a "minus" sign or mention

                                  • Single-Line Invoicing from Sales Order Despite Multiple SKUs Shipped

                                    We deal mostly with Government Tenders And Lets say we got a tender that needs 125 XYZ Laptops Then we found 95 Laptops with a different SKUs and 30 Laptops with different SKUs We talk with the IT department of the government company and they approve

                                  • 📣📣 Zoho Bookings Schedulathon 2025 is here!

                                    Hey Zoho Bookings fam, We're excited to invite you to our first-ever hackathon: Yes, Zoho Bookings Schedulathon 2025 is live now. This is a virtual event and you can participate anywhere from the world. Businesses should be able to set up meetings from

                                  • I want to send out a new newsletter each month

                                    Without rebuilding a whole journey is there a way to create a new newsletter that is sent to an existing journey monthly?

                                  • Reinstalling Workdrive Truesync client

                                    Hi, I attempted to update to the beta version of TrueSync, but it was unstable and kept crashing, so I need to revert to the stable version. How do I properly reinstall TrueSync on a Windows PC? I couldn't install the 3.15.x version directly over the

                                  • Evaluating Creator; yesterday fine; today connection times out

                                    Yesterday I spent hours creating a new app, and it worked fine. Today I cannot access creator.zoho.com. Is this common? I'm in the evaluation mode, but I'm thinking I'm going to keep looking. It worked from my home computer, and now I'm checking it from my work computer. My work computer always works just fine, so I shouldn't htink there would be special settings or anything. If there are, how to find out what they could be? Using Chrome on Windows XP The error I get is: The webpage at https://creator.zoho.com

                                  • Pivot Chart seems to show "old" data - how do I make it update?

                                    I wonder how to make a Pivot Chart "update" its data contents. Here is the background: I need to report a subset of data that is so complicated that it is easier to make a calculation and put the result in a "reporting form", and then display the data from that form.  So, I get data from the "original form" GRANTS, make some calculations and put the result in the "reporting form" PERIOD.  Now I can watch the result in a list called LIST, which works fine. The list LIST shows that form PERIOD contains

                                  • Upcoming Changes to LinkedIn Parsing in Resume Extractor

                                    Starting 31 July 2025, the Zoho Recruit Resume Extractor will no longer support direct parsing of candidate data from LinkedIn profiles. Why Is This Change Needed? In accordance with LinkedIn’s platform policies, extracting profile data through browser

                                  • how to create view in leads module to that will show all leads + converted leads?

                                    is it possible to make custom view that combine all leads + converted leads? how to do that

                                  • Reply and react to comments

                                    Hi everyone! We're excited to bring to you a couple of new features that'll make your sprint process simpler. A cloud application brings with it an array of social media features that can be efficiently used in your organizational setup. As an agile scrum

                                  • Announcing Early Access to "Zoho CRM for Everyone" — A new and exciting update to Zoho CRM

                                    Zoho CRM For Everyone is now officially available to all customers, and the Early Access Program has come to a close. We want to extend our sincere thanks to everyone who participated in the program. Your valuable feedback played a key role in shaping

                                  • Avalara Sales Tax integration - AVATAX

                                    Just wondering if anyone else is having troubles with this integration?  Seems as though Avalara changed their billing process, unbeknownst to Zoho, and now ALL transactions are counted by Avalara, not just transactions in a taxable jurisdiction.  This caused a huge price adjustment billed to us by Avalara within a month of us signing up.  And Avalara is not cheap to begin with! Avalara has been great in waiving that increase, but there seems to be no fix.  Zoho is aware of the problem, but slow

                                  • Invalid value passed for description

                                    Dear Sir, When I am entering the purchase bill , the following message showing "Invalid value passed for description" what should I do ? I am attaching screenshot. With Regards, Harish harish@cracku.in 7978841636

                                  • Zoho Creator - 2024 Release Projection 1

                                    Hello everyone! As we enter 2024, we'd like to extend our warmest wishes for success and prosperity. Your fantastic response to our Product Roadmap page last year has been incredibly motivating. Continuing on this path, we're excited to share a glimpse

                                  • Automation Assistance for Zoho Form Integration and Workflow

                                    Hi, We are currently using a Zoho Form to send out our Global Credit Application and would like to automate the process further. Specifically, we’d like the ABN number submitted through the form to automatically populate the GST/VAT Number field in Zoho

                                  • COQL does not return queryable value if the result set is empty

                                    See linked video for running code illustration of the problem: https://workdrive.zohoexternal.com/external/d49bb40033b43b288d56fdf843095b7c65b28391d3ec5d09c854f416d853003d Moderation update: We are appending the comment that was removed, to add context

                                  • Zoho CRMでの商談の管理のしかたについて初歩的な質問です。

                                    先月からZoho CRMを試験的に導入して運用しています。 商談の管理（運用？）の仕方について教えてください。 商談の数が増えてくると、ダッシュボードの「ステージ別進捗状況」にどんどん過去の商談が蓄積されてくると思うのですが、 現在動きのあるものを中心に確認したくなる気がします。 そのあたりについては、どのように運用が一般的なのでしょうか？ アドバイスいただけるととてもありがたいです。 よろしくお願いします。

                                  • Composite Items & Purchase Orders

                                    The Composite Item is great way to bundle different products and services into a single line and sell it as a single line item in Estimates, Sales Orders and Invoices. However, on the other side - i,e,. Purchasing - this item creates quite a bit of a

                                  • using custom function is it possible to update the created by field in Zoho Crm custom module

                                    using custom function is it possible to update the created by field in Zoho Crm custom module

                                  • Slow Sloww Slowwww Responses

                                    Good day, Has anyone been experiencing slow responses from support? Since Thursday I migrated my Whats app to Sales Iq and I had to synch with Social to get the otp they were sending. Apparently What's app can't be automatically added so I reached out

                                  • You have exceeded the maximum number of attempts for this action. Please retry doing the same in 30 minutes.

                                    When one of Zoho Books user tries to select a vendor, recording a new bill, these message appears: You have exceeded the maximum number of attempts for this action. Please retry doing the same in 30 minutes. Other user, at the same time, but different

                                  • Enable Conversation Context Retention for SalesIQ Answer Bots

                                    Hello Zoho SalesIQ Team, We hope you are doing well. We have noticed that SalesIQ bots currently fail to maintain conversation context in Hebrew. For example, when we follow up on a previous answer or ask for clarification in Hebrew, the bot either provides

                                  • Automatic Hebrew Small Talk Setup Without Duplicate Term Errors & Manual Configuration

                                    Dear Zoho SalesIQ Team, Greetings, We would like to request an enhancement to the Small Talk feature in Zoho SalesIQ, specifically for Hebrew language support. Current Challenge: When setting up Small Talk for Hebrew, we encounter multiple issues: Simple

                                  • Should I Add Leads in Bigin?

                                    ok, first off I'm new here. I just started using Bigin. I'm debating if it's appropriate to enter leads. by leads I mean a list of contacts that I have not yet reached out to...it's a cold calling list.  if I enter them I can track them (I understand

                                  • Zoho Books - Perform a validation check before an invoice is marked as sent or sent

                                    Allow the validation rules to apply to button actions. For example: an invoice could not be sent or marked as sent if it has an empty value in a custom field. (The field could remain blank while it is being worked on.)

                                  • Flow error "given url is wrong"

                                    when I setup a flow to update a task status, I get an error when it runs that says "given url is wrong."

                                  • Upgrade Zoho Desk Agent-Side Answer Bot to GenAI

                                    Hello Zoho Desk Team, We hope you're doing well. Following the recent announcements and rollout of the GenAI-based Answer Bot in Zoho SalesIQ (Nova '25), we’d like to formally request a similar upgrade for the Answer Bot used by agents inside Zoho Desk.

                                  • Bigin Android app update: Email filters enhancement, change owner for related records.

                                    Hello, everyone! In the most recent Bigin Android app update, we have introduced additional email filters and an option to change the owner of related records. Email filters: We have now brought in support for 'All Emails' and 'Added from Widgets' filter

                                  • How can I get all conversations and comments of a Zoho Desk ticket using ZOHODESK

                                    Hi everyone, Currently, I am developing a Zoho Desk extension, and I am following the guide available at https://www.zoho.com/desk/extensions/guide/#ticket-object. While working with Zoho Desk, I have noticed that I can only retrieve the general information

                                  • AI & Zoho Recruit

                                    Hello, I guess we all are using AI in our personal and professional lives. Now, let's imagine. Recruitment is just a succession of stages and steps. For which step would you like to see AI implemented into Zoho Recruit ? I'll start : - Automatic translation

                                  • Workdrive and ChatGPT Team Synced Connectors

                                    Hi, we want to be able to integrate Zoho Workdrive with OpenAI’s ChatGPT Team plan. Google Drive and OneDrive both offer this, zoho please catch up asap. We dont want to have to put our company files in google drive, we want to allow chatgpt Team edition

                                  • widget url 404'ing

                                    I'm creating a widget for the first time. When I grab the url from the base url section of the widget builder and append /widget.html it 404's Just wrote a very basic test. I have a folder structure app.zip - widget.html --js/app.js /widget.html <!DOCTYPE

                                  • Next Page