> ## Documentation Index > Fetch the complete documentation index at: https://apidoc.mailercloud.com/llms.txt > Use this file to discover all available pages before exploring further. # Update Template > This API allows you to update an existing email template in Mailercloud. You can update a template either by providing its id or by using the templateName — at least one of them is required. **Required Fields:** - id: The unique ID of the template you want to update. (Required if templateName is not provided.) - templateName: The name of the template you want to update. (Required if id is not provided.) - name: The new name for the template (maximum 100 characters). The name must be unique. - html: The updated HTML content of the template. **Optional Fields:** - categoryId: Specifies the category ID of the template, you can get it from the **Get Template Categories** API. It would be 0 by default. - plainText: Specifies the plain text content ## OpenAPI ````yaml /openapi-v1.json post /templates/update openapi: 3.1.0 info: title: Mailercloud Marketing API version: 1.0.0 description: >- Campaigns, contacts, lists, segments, automations, and webhooks for the Mailercloud Marketing Platform. servers: - url: https://cloudapi.mailercloud.com/v1 security: - apiKey: [] tags: - name: Campaigns - name: Contacts - name: Lists - name: Tags - name: Segments - name: Custom Properties - name: Senders - name: Templates - name: Automations - name: Webhooks - name: Webforms - name: Inbox Tracker - name: Account paths: /templates/update: post: tags: - Templates summary: Update Template description: >- This API allows you to update an existing email template in Mailercloud. You can update a template either by providing its id or by using the templateName — at least one of them is required. **Required Fields:** - id: The unique ID of the template you want to update. (Required if templateName is not provided.) - templateName: The name of the template you want to update. (Required if id is not provided.) - name: The new name for the template (maximum 100 characters). The name must be unique. - html: The updated HTML content of the template. **Optional Fields:** - categoryId: Specifies the category ID of the template, you can get it from the **Get Template Categories** API. It would be 0 by default. - plainText: Specifies the plain text content operationId: update-template parameters: - name: Content-Type in: header required: false description: 'Request body type ' schema: type: string requestBody: required: true content: application/json: schema: type: object x-examples: Example 1: categoryId: 0 html: Sample HTML name: New Template plainText: Sample HTML properties: categoryId: type: integer html: type: string name: type: string plainText: type: string templateName: type: string examples: Example-1: value: id: AXY categoryId: 0 html: string name: string plainText: string responses: '200': description: OK content: application/json: schema: type: object properties: message: type: string x-examples: Example 1: message: updated template successfully examples: Example-1: value: message: updated template successfully '400': description: Bad Request content: application/json: schema: type: object properties: error: type: string x-examples: Example 1: error: HTML is a required field examples: Example-1: value: error: html is a required field '401': description: Unauthorized content: application/json: schema: type: object properties: errors: type: array items: type: object properties: field: type: string message: type: string x-examples: Example 1: errors: - field: '' message: Authorization failed examples: Example-1: value: errors: - field: '' message: Authorization failed components: securitySchemes: apiKey: type: apiKey in: header name: Authorization description: >- Your Mailercloud API key (plain text, no Bearer prefix). Create keys in Settings → API. ````