veza/veza-backend-api/API_CONTRACT_FINAL.md

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# Veza API Contract (Finalized)
## 1. Overview
This document defines the finalized API contract for the Veza backend. All endpoints adhere to strict JSON standards, snake_case naming conventions, and a unified response envelope.
## 2. Global Standards
- **Protocol**: HTTP/1.1
- **Content-Type**: `application/json`
- **Charset**: `utf-8`
- **Date Format**: ISO 8601 (`YYYY-MM-DDThh:mm:ssZ`)
- **Naming Convention**: `snake_case` for all JSON keys.
## 3. Response Envelope
Every API response (Success or Error) is wrapped in a unified envelope.
### 3.1. Success Response
HTTP Status: `200 OK`, `201 Created`
```json
{
"success": true,
"data": {
// Resource or Object
"id": "123",
"name": "example"
},
"error": null
}
```
### 3.2. Error Response
HTTP Status: `4xx`, `5xx`
```json
{
"success": false,
"data": null,
"error": {
"code": 400,
"message": "Validation failed",
"details": [
{
"field": "email",
"message": "Invalid email format"
}
],
"request_id": "req_123xyz"
}
}
```
## 4. Error Handling
Frontend clients should check the `success` boolean.
- If `success` is `false`, read the `error` object.
- `error.code` maps to standard HTTP status codes but provides application-level context.
- `error.details` is an optional array of field-specific errors (useful for form validation).
## 5. Authentication
- **Header**: `Authorization: Bearer <token>`
- **Token Type**: JWT (Access Token)
- **Refresh**: Use `/api/v1/auth/refresh` to rotate tokens.
## 6. Pagination
Endpoints returning lists support cursor-based or offset-based pagination.
Helper structure in `data`:
```json
{
"list": [...],
"pagination": {
"page": 1,
"limit": 20,
"total": 100,
"has_next": true
}
}
```
## 7. Versioning
- Current Version: `v1`
- Base Path: `/api/v1`
## 8. Key Changes (Remediation Phase)
- **Unified Handlers**: All handlers now use `RespondSuccess` and `RespondWithAppError`.
- **Snake Case**: All DTOs enforce `snake_case`.
- **Validation**: Strict validation on all request bodies using `go-playground/validator`.