--- title: "[How-to Guides and Knowledgebase articles] - Auto Image Tagging with Contentstack Webhooks, AWS Lambda, and AWS Rekognition" description: Auto Image Tagging with Contentstack Webhooks, AWS Lambda, and AWS Rekognition url: https://www.contentstack.com/docs/developers/how-to-guides/auto-image-tagging-with-contentstack-webhooks-aws-lambda-and-aws-rekognition product: Contentstack doc_type: how-to-guide audience: - developers version: unknown last_updated: 2026-03-25 --- # [How-to Guides and Knowledgebase articles] - Auto Image Tagging with Contentstack Webhooks, AWS Lambda, and AWS Rekognition This page explains how to set up automatic image tagging in Contentstack using webhooks to trigger an AWS Lambda function (via API Gateway) that calls AWS Rekognition and then updates asset tags back in Contentstack. It is intended for developers configuring AWS services and Contentstack automation, and should be used when you want tags/keywords applied to assets automatically on create/update events. ## Auto Image Tagging with Contentstack Webhooks, AWS Lambda, and AWS Rekognition **Note: **This page is no longer maintained, and the underlying code may be outdated or unsupported. It may be removed in a future release. To learn how to automate workflows in Contentstack, refer to the [Connectors](/docs/developers/automation-hub-connectors) documentation. Image auto-tagging is the process of assigning relevant tags and keywords to images automatically. In Contentstack, you can achieve this with Contentstack [webhooks](/docs/developers/set-up-webhooks/about-webhooks), AWS Lambda, and AWS Rekognition. **Here's a quick overview of the process**: When an image is created or updated in Contentstack, a webhook is triggered. This calls an AWS Lambda function via the AWS API Gateway. AWS Lambda will then use AWS Rekognition to get relevant tags for the image and update the image tags in Contentstack by making Content Management API requests. Here are the steps to set up image auto-tagging: - [Create an AWS account and user](#create-an-aws-account-and-user) - [Create a Contentstack role](#create-a-contentstack-role) - [Set up Lambda function and API gateway](#set-up-lambda-function-and-api-gateway) - [Trigger a webhook to initiate auto-tagging](#trigger-a-webhook-to-initiate-auto-tagging) ## Prerequisites - Working knowledge of AWS API Gateways - Access to the AWS environments such as AWS Lambda, AWS API Gateway, and AWS Rekognition - [Contentstack account](https://app.contentstack.com/#!/login) ## Create an AWS Account and User Create an [AWS user](https://docs.aws.amazon.com/IAM/latest/UserGuide/id_users_create.html) with programmatic access. - Add the Amazon Rekognition Read-only Access (AWS managed policy) permission policy to the user. - Create an access key and secret key for the user. These credentials will be used to access AWS Rekognition service from the Lambda function. ## Create a Contentstack Role [Create a role](/docs/developers/invite-users-and-assign-roles/create-a-role) in Contentstack and give that user full access to [assets](/docs/content-managers/working-with-assets/about-assets), so that users can [publish the assets](/docs/content-managers/working-with-assets/publish-an-asset). - You can create a new role or assign an existing [user](/docs/developers/invite-users-and-assign-roles/about-stack-users) with full access to assets. These credentials will be used in the Lambda function. ## Set up Lambda Function and API Gateway Login to your **AWS Management Console**, select **AWS Lambda Service** from the service list. - Click on the **Create Function** button, and then the **Author from Scratch** option. - Configure the Lambda based on your requirements. Choose **Node.js** as your run-time language. **Note**: You can use any language instead of Node.js. You can also add triggers to your lambda to push an event when the lambda is invoked. - AWS Lambda offers an inline code editor. You can write your lambda code here or alternatively upload the code. We have created a sample code for this exercise. If Extensions are part of your plan, contact our [Support](mailto:support@contentstack.com) team to get the code for the extension. - After downloading the code, use the index.zip file present in the root folder of the current repo as AWS lambda code and add the environment variable as shown in the next step. - In the **Environment variables** section, enter the credentials against the variables as follows: | Environment variable | Value | |---|---| | **REKOGNITION_AWS_ID** | {access_id_of_aws_user} (required) | | **REKOGNITION_AWS_REGION** | {aws_region} (required) | | **REKOGNITION_AWS_SECRET** | {access_key_of_the_aws_user} (required) | | **MIN_CONFIDENCE** | {minimum_confidence_of_tag} (default is 70) | | **MAX_TAGS** | maximum tags per image (default is 10) | | **CONTENTSTACK_STACK_MANAGEMENT_TOKEN** | {Your Stack's Management Token} | | **CONTENTSTACK_STACK_API_KEY** | {Your stack API Key} | - In the Lambda function handler and role, keep the index.handler as **Handler** and for the **Role** choose an existing role or create a new role from template(s). - Review your setting and click on the **Create Function** option if everything you entered is correct. Once you do this setup, AWS Lambda will run the code that we have uploaded. So every time a new asset is published in Contentstack, a webhook (we will set up next) will be triggered and the Lambda function will be executed. ## Trigger a Webhook to Initiate Auto Tagging Create a webhook in Contentstack that will initiate a Lambda function that we have set up in the above step. To do this, log in to your [Contentstack account](https://app.contentstack.com/) and perform the following steps: Click on the “Settings” icon (press “S”) on the left navigation panel and click on **Webhooks** (press “alt + W” for Windows OS, and “option + W” for Mac OS). - Click on** + New Webhook.** - Enter any valid name for your webhook, for example, **Auto Image Tagging**. - In the** URL to notify** field, enter the AWS Lambda URL, where the webhook will notify about the change. - Under the **Conditional View** section, select the options **Any **| **Asset **| **Created**. - Click on "**+**" icon and add another condition. Select the options **Any** | **Asset **| **Updated**. **Additional Resource**: You can refer to our guides on how you can use [Contentstack Webhooks with AWS Lambda](/docs/developers/set-up-webhooks/webhook-integrations) to automate several content management tasks. ## Common questions ### Is this guide still supported? **Note: **This page is no longer maintained, and the underlying code may be outdated or unsupported. It may be removed in a future release. ### What triggers the auto-tagging workflow? When an image is created or updated in Contentstack, a webhook is triggered. ### Which AWS services are involved? AWS Lambda, AWS API Gateway, and AWS Rekognition. ### What Contentstack permissions are needed? Give that user full access to [assets](/docs/content-managers/working-with-assets/about-assets), so that users can [publish the assets](/docs/content-managers/working-with-assets/publish-an-asset).