Handling API Limits and Error Responses

Handling API Limits and Error Responses



Hi Everyone,
Welcome back to yet another post in the Kaizen Series! 
We appreciate your keen participation in the 200th milestone celebration of the Kaizen series. We will continue to answer the queries we received through the feedback. 
When working with Zoho CRM APIs, you must respect API limits, handle errors properly, and deliver meaningful experiences—even when things go wrong. In this post, we will discuss handling API limits and error responses.

Understanding Zoho CRM API Limits

Zoho CRM enforces API limits based on the purchased user licenses and add-on credits, and this is to ensure availability to all users and prevent abuse of its APIs. The following limits are applicable to Zoho CRM REST APIs.

  • API Credits Limits: Each edition (Free, Standard, Professional, etc.) comes with a set number of API credits per rolling 24-hour window. For example, Enterprise/Zoho One offers a baseline of 50,000 plus 1,000 per user license, with a cap up to 5,000,000 credits including add-one credits. You can refer to our help documentation on API limits for more details.
  • Concurrency Limits: Concurrency is the number of parallel API calls that are active at one time instance. Apps are capped at concurrent requests based on CRM edition: Free (5), Standard (10), Professional (15), Enterprise (20), Ultimate (25).
  • Sub-Concurrency Limits: Some resource-intensive APIs have their own concurrency limits (typically 10 concurrent requests): bulk updates, queries, lead conversion, mail, etc. Exceeding these returns a TOO_MANY_REQUESTS error.
  • Limits per Call: Different APIs have specific limits for the number of resources that can be inserted/updated. For example for insert, update, or upsert records, you can pass up to 100 records in one API call. Refer to the individual help documentation for any such limits.

Tips:

  • Monitor Usage: Use Zoho’s dashboard to track API credits in real time. Set alerts if you are approaching limits. Alternatively, keep an eye on the header X-API-CREDITS-REMAINING which denotes the remaining credits that will be present in the response when your API usage exceeds 50 percent or the daily available credit limit. Also, you can customize your usage notification to receive an email alert.
  • Batch Operations: Prefer bulk inserts/updates (up to 100 records/call) to reduce wasteful requests. Use composite APIs when multiple APIs need to be executed. 
  • Space Out Calls: When integrating, use logical intervals and avoid call bursts to prevent concurrency /subconcurrency limit getting applied. We have covered this in more detail in our previous Kaizen post : How to effectively handle API calls to optimize API credits?

Limits in Zoho CRM GraphQL APIs

Like our REST APIs, our GraphQL API calls also consume credits based on the type and number of resources queried. Maximum allowed credits per call is 10 credits.
Complexity for each query is calculated based on the type and number of resources requested, and maximum allowed complexity is 1,000 per query. 
Depth refers to the number of nesting layers of a field. Depth up to seven for metadata and three for records is allowed.
You can refer to our GraphQL API documentation on Credits, Complexity, and Depth for more details.

Handling Errors

 Zoho CRM REST APIs return 200 status codes for every successful API call. Each API error has these sections:
  • Status Code 
  • Error Code 
  • Message 
Different sections of an error response
Here "resource_path_index": 0 in the response indicates which segment of the URL path contains the error, counting after the API version.

Common Errors

  • 400 Bad Request:  
    • INVALID_MODULE
      • Cause: Incorrect module name (e.g., "Lead" vs "Leads").
      • Fix: Use exact API names from Setup > Developer Space > APIs.
    • INVALID_DATA
      • Cause: Malformed JSON/wrong data type.
      • Fix: Validate field formats.
    • DUPLICATE_DATA
      • Cause: Unique field value exists elsewhere.
      • Fix: Disable "Do not allow duplicates" or change value.
    • MANDATORY_NOT_FOUND
      • Cause: Missing required field (e.g., Last_Name in Contacts while trying to insert a new record in Contacts module).
      • Fix: Include all mandatory fields in the request.
  •  401 Unauthorized: 
    • AUTHENTICATION_FAILED
      • Cause: Wrong domain URL .
      • Fix: Use the correct domain-specific URL.
    • INVALID_TOKEN:
      • Cause: Expired OAuth token is used for making API call.
      • Fix: Refresh access token using the refresh token.
  • 403 Forbidden: 
    • NO_PERMISSION
      • Cause: User lacks permission for the resource.
      • Fix: Obtain necessary permission to access the resource.
  •  404 Not Found: 
    • INVALID_URL_PATTERN
      • Cause: URL syntax error.
      • Fix: Verify endpoint structure in API docs.
  •  429 Too Many Requests: 
    • TOO_MANY_REQUESTS
      • Cause: Number of API requests for the 24 hour period is exceeded or the concurrency/sub-concurrency limit of the user for the app is exceeded.
      • Fix: Make calls in accordance with the limits.
  • 207 Multi-Status: 
    • In some cases when the API is partially successful, 207 status code is returned.

Tips

  • Mandatory Fields: Provide all mandatory fields in the response body.
  • OAuth Issues: Ensure correct scopes.
  • Inspect Every Response Body: Parse responses even if the HTTP status code returned is 2XX. 
  • Validate Data Before Calling: Ensure your request matches the expected format. Clean data before submission to prevent 400-range errors (e.g., MANDATORY_NOT_FOUND, DUPLICATE_DATA).
  • Token Issues: Respond to INVALID_TOKEN with a token refresh workflow.

Error Status Code in GraphQL APIs 

Zoho CRM GraphQL APIs return errors in 200 and 400 status codes depending on error type. 200 HTTP status codes are returned in two cases. 
(a) Issue in the input when validated against the schema .
(b) Runtime errors due to credits, depth, and so on.

Refer to the Status Codes and Responses page in GraphQL for more information.
We hope you found this post useful. We will be back next week to answer another query we received.
Let us know if you have any questions in the comments or drop us an email at support@zohocrm.com.

    • 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

    • Recent Topics

    • Narrative 10: Assignment Rules - Streamlining Ticket Management

      Behind the scenes of a successful ticketing system: BTS Series Narrative 10: Assignment Rules - Streamlining Ticket Management In the complex world of customer support, a flood of incoming tickets can hit the help desk in seconds. Businesses must do more

    • Free webinar! Digitize recruitment and onboarding with Zoho Sign and Zoho Recruit

      Hello, Tired of being buried in onboarding paperwork? With the integration between Zoho Sign and Zoho Recruit, a powerful applicant tracking system, you can digitize and streamline the entire recruitment and onboarding process, all from one platform.

    • Custom form - Duplicate Value Present

      I am new to Zoho People. I create a new form on Zoho People quite simple. A date (by default the current date) and a radio button with 3 options (Yes, No, Not applicable) I defined the date as ‘No duplicate’ as only one entry by date is allowed. I added:

    • Zoho API connection issues

      Hi, Today at around 1930 GMT our application started experiencing intermittent timeouts from the Zoho API. These intermittent timeouts are not enabling our app to work properly. The API connection was working just fine before. HTTPSConnectionPool(host='www.zohoapis.com',

    • Query Regarding our Partnership between AIC-JKLU and Zoho

      Dear Zoho Team, I am writing to raise a concern on behalf of AIC-JKLU, one of Zoho’s incubator partners. Recently, our startups have been facing difficulties while trying to get themselves onboarded on Zoho through our dedicated partner link. Unfortunately,

    • Disputed Purchase Invoices

      We have recently moved to Zoho Books from Sage. In Sage we were able to post a purchase/vendor invoice but mark it as on dispute. This would usually be a pricing query or if something was damaged. It would show in their ledger, so we could agree their

    • Getting events in the future

      Hi I am trying to get events in the future by calling this API Endpoint https://www.zohoapis.eu/crm/v8/Events?fields=Event_Title,Created_By,Created_Time,Start_DateTime But that gives me all events in the database. How do I make a query that returns all

    • Created Date/Invalid Fields

      Since Saturday we have suddenly had issues with our webhooks and data retrieval from CRM. Specifically how Created Date is handled. It appears there was some sort of change within CRM that broke a lot of our code that has been in place for several years.

    • Zoho Inventory. Preventing Negative Stock in Sales Orders – Best Practices?

      Dear Zoho Inventory Community, We’re a small business using Zoho Inventory with a team of sales managers. Unfortunately, some employees occasionally overlook stock levels during order processing, leading to negative inventory issues. Is there a way to

    • Problem for EU users connecting Zoho CRM through Google Ads for Enhanced conversions

      Has anyone else experienced this problem when trying to connect Zoho CRM through Google Ads interface to setup enhanced conversions? Did you guys get it fixed somehow? The Problem: The current Google Ads integration is hardcoded to use Zoho's US authentication

    • integration zoho form - drive

      I integrated my form with Google Drive. The report of user submissions from the Google Form becomes a Google Sheets table. When I used Google Forms for the same task, the summary sheet adapted to the form. For example, if I added a new field to the form,

    • add employees and customiz

      I want a Zoho software to track employees record. I logged in a demo so now I tried adding employee, first thing when I click on add employee it takes me to a page where it says add user maximum 10 users, my first doubt why users I don't want employees

    • Revenue Management: #9 Revenue Recognition in Media & Publishing

      Media & Publishing industry has evolved in recent times. It offers subscriptions, bundles digital and print access, runs sponsored content, and sometimes even sells ad spaces. If you run a media or publishing business, you will always get into a situation

    • Zoho CRM Community Digest - July 2025 | Part 2:

      Hello, Everyone! We’re closing out July with a can’t-miss highlight: Zoholics Europe 2025! Happening from September to October, it’s your chance to level up your CRM skills, covering everything from automation and CPQ to dashboards and advanced workflows.

    • How can I trigger a flow action only once while updating contact?

      Hi, we have a trigger to merge&mail file when the field YYY is filled out. For this acion I used "Create or update module entry". But unfortunately we get tens of email on a day with this merged file, because the contact is being regularly updated. The

    • Copy a Record Template from one Form to another

      I have a Creator application with several forms.  I developed a record template for one of the reports/forms but want to use most of it for another of the form/report combinations in the application. Is there a way to copy the template (code or otherwise) to another form?

    • Tip of the Week #70 – Create common team signatures for your shared inboxes

      Did you know that a small detail, such as an email signature, can make a big difference in how your brand is perceived? One simple yet smart way to enhance your team’s communication is by creating common team signatures for your shared inboxes. Instead

    • Enhanced data export features: XLSX format, custom character encoding, and selective record export

      Greetings all, Here are a few enhancements related to exporting CRM data, including the ability to export data in XLSX file format now. The Export feature under Data Administration now offers new options that expand its flexibility and enable users to

    • Tip #42 – How to manage data security with Privacy Settings – 'Insider Insights'

      Data privacy is a cornerstone of trust in remote support. Through Privacy Settings in Zoho Assist, you can set up how data is gathered, stored, and handled in your organization. These settings ensure compliance, data protection for sensitive details,

    • Zoho DataPrep and File Pattern configuration

      I'm using Zoho data prep to ingest data from One Drive into Zoho Analytics... The pipeline is super simple but I can't any way to get all the files that I need. Basically I need to bring all the files with a certain pattern and for that I'm using a regex

    • Introducing Dark Mode / Light Mode : A New Look For Your CRM

      Hello Users, We are excited to announce a highly anticipated feature - the launch of Day, Night and Auto Mode implementation in Zoho CRM's NextGen user interface! This feature is designed to provide a visually appealing and comfortable experience for

    • Quick Item Search & Auto-suggestion for Invoices

      Hi Team, I am facing an issue while creating invoices in Zoho Books. Currently, I have to type the full item name in the correct sequence and spelling for it to appear. For example, my item name is: "Distemper Acri Silk Special White 10kg" If I type something

    • Ticketbai! en el Pais Vasco

      Hola a todos, En enero de 2.022 se va a implantar en el país vasco un nuevo sistema de facturación, denominado ticketbai!, ¿hay alguna previsión de realizar las adaptaciones en zoho books o zoho invoices? Ignoro la cantidad de clientes que tienen estas

    • Zoho CRM mobile app feature update: home page widgets, field tooltips and user image upload

      Hello everyone! Your business doesn't pause when you're on the move, and neither should your CRM. That's why in our latest update, we've introduced a few new features to make your mobile CRM experience smoother and more efficient. Let's take a quick look

    • Zoho CRM Plain Text Template: Line Breaks and Formatting Issue

      Hello, I'm following the instructions to create email templates in Zoho CRM, but I'm having a problem with the plain text version. https://help.zoho.com/portal/en/kb/zoho-sign/integrations/zoho-apps/zoho-crm/articles/zoho-crm-email-templates#Steps_to_create_a_custom_email_template

    • Optimizing Task Handling: Auto-Remove Recurrence for cancelled Tasks.

      Hello Everyone, A Custom function is a user-written set of code to achieve a specific requirement. Set the required conditions needed as when to trigger using the Workflow rules (be it Tasks / Project) and associate the custom function to it. Requirement:

    • Important updates to your connectors

      Hello everyone, Greeting from Zoho Creator! We're excited to announce that we'll be rolling out significant backend updates to Zoho Creator's built-in connectors to enhance security by following the latest frameworks. The existing version of some of the

    • Create, collaborate, and manage agreements with Zoho Sign

      Agreements drive business. We launched Zoho Sign in 2017 as a simple digital signature tool to sign agreements from anywhere, at any time. Over the years, we've learned that most agreements go through last-minute changes before they're signed. Our users

    • Function #25: Automatically generate purchase orders from a sales order

      We kicked off the "Function Fridays" series with the goal of helping you automate your everyday accounting tasks. As we delve into today's post, I'm delighted to announce that we're here to present the 25th custom function in this series. While it is

    • Has Anyone successfully integrated Zoho and Sage Intact?

      Hey all, We’re evaluating Zoho One + Sage Intacct and I’m trying to connect with anyone who has actually implemented the two together.Specifically, I’d love to know: -- Which functions you kept in Zoho vs. Intacct (e.g., Product Catalog, AR/AP, invoicing,

    • DNS set up

      I want to create an email with my company domain. When I tried to add new record with cloudflare it didn't work. The DNS record can't be manually added. I followed the instruction but still can't add it. Could you help?

    • 5名限定 課題解決型ワークショップイベント Zoho ワークアウト開催のお知らせ (9/25)

      ユーザーの皆さま、こんにちは。Zoho ユーザーコミュニティチームの藤澤です。 9月開催のZoho ワークアウトについてお知らせします。 今回はZoomにて、オンライン開催します。 ▷▷参加登録はこちら：https://us02web.zoom.us/meeting/register/6OSF2Bh6TumsMIlDwaY_PQ ━━━━━━━━━━━━━━━━━━━━━━━━ Zoho ワークアウトとは？ Zoho ユーザー同士で交流しながら、サービスに関する疑問や不明点の解消を目的とした「Zoho

    • hiding a topic from all but one segment (or list)

      My organization sends out a number of newsletters using Zoho Campaigns. One of those newsletters is for volunteers. In order to become a volunteer, a person has to first go through our volunteer orientation (training). After that, they can receive newsletters

    • How do I set up this automation correctly?

      When contacts enter my Subscribers list, I want it to reference a custom field to see if it is empty. Then I want it to do two things: If empty: Assign a tag based on a different custom field. If that custom field is empty, assign a different tag. If

    • Function #62: Display associated Quote on Invoice details screen

      Hello everyone! Today, we are sharing a Related List script that makes it easy to view and access the quote from which an invoice was created right from the invoice details screen. This Related List displays the Quote number and Amount, allowing you to

    • Custom confirmation message

      How can I change the message that users see after they submit the booking form? I have to confirm some details before their appointment is officially "confirmed", so I want to change it where it doesn't say their appointment is "confirmed" but rather

    • email forwarding not working

      Your email forwarding service does not work. I received the confirmation email and completed the confirmation, after that nothing and nothing since no matter what I have tried. Shame as everything else was smooth. I spose it's harder to run one of these web based internet mail services than you guys thought!!! can you fix the email forwarding asap PLEASE!

    • Desk x CRM Integration

      Howdy! We currently use SalesIQ but we are considering moving across to Desk as it seems to have more functionality that we want. One of the pulls is the ability for our customers to self serve. But, I might be getting over excited and not actually need

    • Function #53: Transaction Level Profitability for Invoices

      Hello everyone, and welcome back to our series! We have previously provided custom functions for calculating the profitability of a quote and a sales order. There may be instances where the invoice may differ from its corresponding quote or sales order.

    • Issue with Save & Share Link – Works for Others but Not Creator

      I’ve enabled the "Save and Share" feature in Zoho Forms, and it works correctly for all users accessing the public link—except for me (the form creator). Issue Details: When I save and share the link, recipients see a “no permission” error. The form is

    • Next Page