> ## Documentation Index > Fetch the complete documentation index at: https://docs.senderr.dev/llms.txt > Use this file to discover all available pages before exploring further. # Render Template > Render an email template with provided variables. Returns HTML or React format based on request. ## OpenAPI ````yaml api-reference/openapi.json post /templates/{id}/render openapi: 3.0.3 info: title: Senderr Email Template API description: >- API for accessing and managing email templates in your library. Supports both session-based authentication and API key authentication with rate limiting based on subscription plans. version: 1.0.0 contact: name: Senderr Support url: https://senderr.dev/contact email: support@senderr.dev license: name: MIT url: https://opensource.org/licenses/MIT termsOfService: https://senderr.dev/terms servers: - url: https://senderr.dev/api/v1 description: Production server - url: http://localhost:3000/api/v1 description: Development server security: - BearerAuth: [] - SessionAuth: [] tags: - name: Library description: Operations related to user's template library - name: Templates description: Operations for template rendering and source code access - name: Email description: Operations for sending emails using templates - name: Usage description: Operations for checking API usage and limits paths: /templates/{id}/render: post: tags: - Templates summary: Render Template description: >- Render an email template with provided variables. Returns HTML or React format based on request. operationId: renderTemplate parameters: - name: id in: path required: true description: Template ID schema: type: string format: uuid requestBody: required: true content: application/json: schema: type: object properties: variables: type: object additionalProperties: true description: Template variables as key-value pairs format: type: string enum: - html - react default: html description: Output format required: - variables example: variables: name: John Doe email: john@example.com company: Acme Corp format: html responses: '200': description: Template rendered successfully content: application/json: schema: type: object properties: success: type: boolean example: true html: type: string description: Rendered HTML output (when format=html) react: type: string description: React component code (when format=react) example: success: true html: >-

Hello John Doe

'400': $ref: '#/components/responses/BadRequest' '401': $ref: '#/components/responses/Unauthorized' '403': $ref: '#/components/responses/AccessDenied' '404': $ref: '#/components/responses/NotFound' '429': $ref: '#/components/responses/RateLimitExceeded' '500': $ref: '#/components/responses/InternalServerError' components: responses: BadRequest: description: Bad request - invalid input data content: application/json: schema: $ref: '#/components/schemas/ValidationErrorResponse' example: error: Invalid request body code: VALIDATION_ERROR success: false details: - field: variables message: Variables must be an object Unauthorized: description: Authentication required content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: Authentication required success: false AccessDenied: description: Access denied - template not purchased content: application/json: schema: type: object properties: error: type: string example: Template access denied code: type: string example: ACCESS_DENIED message: type: string example: You must purchase this template to render it template: type: object properties: id: type: string format: uuid title: type: string price: type: string NotFound: description: Resource not found content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: Template not found success: false RateLimitExceeded: description: Rate limit exceeded headers: X-RateLimit-Limit: description: The number of allowed requests in the current period schema: type: integer X-RateLimit-Remaining: description: The number of remaining requests in the current period schema: type: integer example: 0 X-RateLimit-Reset: description: The time when the rate limit resets schema: type: string format: date-time X-RateLimit-Plan: description: The user's current subscription plan schema: type: string enum: - free - monthly - annual Retry-After: description: Number of seconds to wait before retrying schema: type: integer content: application/json: schema: $ref: '#/components/schemas/RateLimitErrorResponse' InternalServerError: description: Internal server error content: application/json: schema: $ref: '#/components/schemas/ErrorResponse' example: error: Internal server error code: INTERNAL_ERROR success: false schemas: ValidationErrorResponse: allOf: - $ref: '#/components/schemas/ErrorResponse' - type: object properties: details: type: array items: type: object properties: field: type: string message: type: string ErrorResponse: type: object properties: error: type: string description: Error message code: type: string description: Error code success: type: boolean example: false details: type: object description: Additional error details required: - error - success RateLimitErrorResponse: type: object properties: error: type: string example: API usage limit exceeded code: type: string example: RATE_LIMIT_EXCEEDED message: type: string description: Detailed error message with upgrade suggestions details: type: object properties: limit: type: integer description: Monthly API call limit remaining: type: integer example: 0 reset: type: string format: date-time description: When the limit resets plan: type: string enum: - free - monthly - annual resetInSeconds: type: integer description: Seconds until limit resets upgrade_url: type: string nullable: true description: URL to upgrade plan (for free users) documentation: type: string format: uri description: Link to rate limiting documentation securitySchemes: BearerAuth: type: http scheme: bearer bearerFormat: API Key description: 'Use your API key from the dashboard. Format: `Bearer your-api-key-here`' SessionAuth: type: apiKey in: cookie name: supabase-auth-token description: Session-based authentication using browser cookies ````