> ## Documentation Index > Fetch the complete documentation index at: https://bavlio.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Preview CSV or Excel file before upload > Upload a CSV or Excel file to preview its structure, columns, and sample data ## OpenAPI ````yaml https://api.bavlio.com/openapi.json post /api/v1/upload/preview openapi: 3.1.0 info: title: Bavlio API description: >- Outreach automation API — lead enrichment, email campaigns, LinkedIn automation, and AI agent. Full docs at https://docs.bavlio.com. version: 1.0.0 servers: [] security: [] tags: - name: API Keys description: >- Create, list, and revoke API keys for programmatic access. JWT authentication required. - name: credits description: Credit balance, cost estimates, and transaction history. - name: campaigns description: Create, manage, launch, and monitor email campaigns. - name: campaign-personalization description: AI-powered email subject and body personalization for campaigns. - name: email-finder description: Find and verify email addresses for prospects. - name: email-verification description: Validate email addresses and prune invalid entries from datasets. - name: sender-profiles description: Manage sender identity profiles for outreach. - name: sender-profile-chat description: Interactive chat for building sender profiles. - name: templates description: Email template CRUD. - name: suppression description: Do-not-contact suppression list management. - name: datasets description: Lead dataset listing, download, and updates. - name: user-extractions description: Uploaded lead file management and processing. - name: enrichment-chat description: Interactive chat for data enrichment sessions. - name: enrichment-processing description: Batch lead enrichment processing. - name: File Upload (CSV/Excel) description: Upload and preview CSV/Excel lead files. - name: connected-accounts description: LinkedIn account connections via Unipile. - name: linkedin-content description: LinkedIn post creation, scheduling, and management. - name: linkedin-playground description: Direct LinkedIn actions (profile lookup, messaging, engagement). - name: bavimail-proxy description: BaviMail domain, alias, and email management. - name: agent description: Bavi AI agent chat with SSE streaming. - name: notifications description: Notification preferences and delivery. - name: referral description: Referral code management and stats. - name: feedback description: User feedback submission. - name: authentication description: JWT token verification and user info. - name: Google OAuth description: Google OAuth login flow and access tokens. - name: Google Sheets OAuth description: Google Sheets import and access management. - name: stripe description: Stripe checkout, billing portal, and subscription status. JWT only. - name: users description: User quota and usage information. - name: Health description: Health checks and system status. - name: Personalization description: Core lead personalization engine. - name: Session Management description: Enrichment session lifecycle. - name: Session Processing description: Session data processing. - name: webhooks description: Inbound webhook handlers (Stripe, BaviMail, Unipile). paths: /api/v1/upload/preview: post: tags: - File Upload (CSV/Excel) summary: Preview CSV or Excel file before upload description: >- Upload a CSV or Excel file to preview its structure, columns, and sample data operationId: preview_file_api_v1_upload_preview_post requestBody: content: multipart/form-data: schema: $ref: >- #/components/schemas/Body_preview_file_api_v1_upload_preview_post required: true responses: '200': description: Successful Response content: application/json: schema: $ref: '#/components/schemas/UnifiedPreviewResponse' '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' security: - HTTPBearer: [] components: schemas: Body_preview_file_api_v1_upload_preview_post: properties: file: type: string format: binary title: File description: CSV or Excel file to preview type: object required: - file title: Body_preview_file_api_v1_upload_preview_post UnifiedPreviewResponse: properties: filename: type: string title: Filename description: Name of the uploaded file file_type: type: string enum: - csv - excel title: File Type description: Type of file uploaded csv_info: anyOf: - $ref: '#/components/schemas/CSVInfo' - type: 'null' description: CSV file information (only populated for CSV files) sheets: anyOf: - additionalProperties: true type: object - type: 'null' title: Sheets description: >- Information about each sheet in the Excel file (only populated for Excel files) total_sheets: anyOf: - type: integer - type: 'null' title: Total Sheets description: >- Total number of sheets in the Excel file (only populated for Excel files) message: type: string title: Message description: Success or informational message type: object required: - filename - file_type - message title: UnifiedPreviewResponse description: >- Unified preview response for CSV and Excel files. This model supports both CSV and Excel file previews through a single endpoint. The file_type field determines which optional fields are populated. HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError CSVInfo: properties: row_count: type: integer title: Row Count description: Total number of rows in the CSV file column_count: type: integer title: Column Count description: Number of columns in the CSV file columns: items: type: string type: array title: Columns description: List of column names/headers sample_data: items: additionalProperties: true type: object type: array title: Sample Data description: First 5 rows of data for preview type: object required: - row_count - column_count - columns - sample_data title: CSVInfo description: CSV file preview information. ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type type: object required: - loc - msg - type title: ValidationError securitySchemes: HTTPBearer: type: http scheme: bearer ````