> ## Documentation Index > Fetch the complete documentation index at: https://docs.h0p.co/llms.txt > Use this file to discover all available pages before exploring further. # Create tag > Create a new tag to label and filter short links. Tags help categorize links across multiple folders. ## OpenAPI ````yaml https://api.h0p.co/doc post /tag openapi: 3.0.0 info: version: 0.0.3 title: h0p API description: >- # h0p URL Shortener API A modern, feature-rich URL shortener API with advanced analytics, custom domains, QR codes, and comprehensive link management capabilities. ## Features - 🔗 **Short Link Management**: Create, update, and delete short links with custom slugs - 🌐 **Custom Domains**: Use your own domains with DNS verification and deep linking support - 📊 **Analytics**: Detailed click tracking with geolocation, device, and referrer data - 🎨 **QR Codes**: Generate customizable QR codes with branding options - 🏷️ **Organization**: Folders and tags for better link organization - 🔐 **Security**: Password protection, expiration dates, and click limits - 🎯 **Smart Rules**: Geographic, language, and device-based routing - 🪝 **Webhooks**: Real-time notifications for link events - 🔑 **API Keys**: Programmatic access with granular permissions - ⚡ **Rate Limiting**: Built-in protection against abuse ## Authentication This API supports two authentication methods: 1. **Session Authentication**: Cookie-based authentication for web applications 2. **API Key Authentication**: Header-based authentication for programmatic access See the security schemes section below for implementation details. ## Rate Limits - Free plan: 10 short links, 1 custom domain, 3 tags - Premium plan: unlimited short links, 100 custom domains, 100 tags, 100 folders, advanced features ## Support For questions, feature requests, or bug reports, please contact support@h0p.co termsOfService: https://h0p.co/terms contact: name: h0p Support email: contact@h0p.co servers: - url: https://api.h0p.co description: Production API server security: [] tags: - name: Domain description: >- Custom domain management with DNS verification, QR templates, and deep linking support - name: Short Link description: >- Create and manage short links with advanced features like smart routing, password protection, and custom QR codes - name: Folder description: >- Organize short links into folders for better management and statistics tracking - name: Tag description: Categorize and filter short links using customizable tags - name: Files description: Upload images for QR codes, meta tags, and organization branding - name: Statistics description: >- Access detailed analytics grouped by geographic, device, and traffic dimensions paths: /tag: post: tags: - Tag summary: Create tag description: >- Create a new tag to label and filter short links. Tags help categorize links across multiple folders. requestBody: required: true description: Tag name and optional color content: application/json: schema: type: object properties: name: type: string minLength: 1 maxLength: 30 example: social-media description: Tag name color: type: string pattern: ^#[0-9A-Fa-f]{6}$ example: '#10B981' description: Tag color (hex) required: - name description: Tag creation request example: name: social-media color: '#10B981' responses: '200': description: Tag successfully retrieved content: application/json: schema: type: object properties: id: type: string format: uuid example: 01933eb8-541f-7000-a9f4-e4eee80ff04e description: Tag UUID organizationId: type: string format: uuid example: 01933eb8-541f-7000-a9f4-e4eee80ff04e description: Organization UUID name: type: string minLength: 1 maxLength: 30 example: social-media description: Tag name color: type: string nullable: true pattern: ^#[0-9A-Fa-f]{6}$ example: '#10B981' description: Tag color (hex) createdAt: type: string format: date-time example: '2024-01-15T10:30:00Z' description: Creation timestamp updatedAt: type: string format: date-time example: '2024-01-16T14:20:00Z' description: Last update timestamp required: - id - organizationId - name - color - createdAt - updatedAt description: Complete tag object '403': description: Tag limit reached - Maximum tags for plan exceeded content: application/json: schema: type: object properties: code: type: string enum: - TAG_LIMIT_REACHED description: Tag limit error code message: type: string example: >- You have reached the maximum number of tags (50) for your plan description: Detailed error message required: - code - message example: code: TAG_LIMIT_REACHED message: You have reached the maximum number of tags (50) for your plan '409': description: >- Conflict - A resource with the specified unique identifier already exists content: application/json: schema: type: object properties: code: type: string enum: - ALREADY_EXIST description: >- Error code indicating a resource with the same unique identifier already exists required: - code example: code: ALREADY_EXIST security: - ApiKey: [] components: securitySchemes: ApiKey: type: apiKey in: header name: x-api-key description: >- API Key authentication for programmatic access. **How to use:** 1. Create an API key from your dashboard settings 2. Include the key in the `x-api-key` header with each request 3. API keys have granular permissions (domains, shortLinks, files, stats, apiKeys) **Example:** ``` curl -H "x-api-key: your-api-key-here" https://api.h0p.co/short-link/list ``` **Types of API keys:** - **User keys**: Linked to your user account (one per organization) - **Bot keys**: Autonomous machine users (one per organization) **Security notes:** - Keep your API keys secure and never commit them to version control - API keys cannot access authentication endpoints (/auth/*) - Keys can be revoked at any time from the dashboard ````