Your Custom REST API
Without Writing a Backend
Define your data schema in Omnismith. Get a fully-featured REST API with OpenAPI spec, personal access tokens, role-based access control, and an audit trail — no backend code required.
Everything a Backend Gives You — Without the Code
REST API with OpenAPI Spec
Every entity template generates typed API endpoints. Browse and test via Swagger UI at swagger.omnismith.io.
Custom Schemas — No Migrations
Define attributes (7 data types + lists + references) and templates that map to your domain. Add or remove fields any time with no migrations.
Role-Based Access Control
Assign per-template, per-entity, or per-feature permissions. Build multi-tenant apps where each client sees only their own data.
Personal Access Tokens
Generate tokens with the omni_* prefix for your frontend or CI/CD pipeline. Revoke at any time from the security dashboard.
Automatic Audit History
Every API write is logged with the author, timestamp, and changed values. Your clients get a full change history with no extra work.
Automations & Webhooks
Fire webhooks to your app when data changes. Connect Omnismith events to your own backend, Slack, or any HTTP endpoint.
From Schema to API in Minutes
- 1
Define your template
Create attributes for your domain (Product, Order, User, Asset) with the right data types — string, number, date, file, list, reference.
- 2
Generate an access token
Create a personal access token (omni_*) scoped to the right permissions.
- 3
Start making API calls
Use the REST API to create, read, update, and delete entities. Check the OpenAPI spec for all available endpoints and request schemas.
- 4
Connect your frontend
Fetch entity lists, render detail views, submit forms — all backed by Omnismith without a custom API server.
# List entities by template
GET /api/v1/entities?templateId=uuid
Authorization: Bearer omni_your_token
# Response
{
"data": [
{
"id": "entity-uuid",
"attributes": {
"name": "Product A",
"price": 29.99,
"in_stock": true,
"category": "Electronics"
},
"createdAt": "2026-02-23T10:00:00Z"
}
],
"meta": { "total": 42, "page": 1 }
} # Update entity attributes
PUT https://api.omnismith.io/v1/entities/{id}
Authorization: Bearer omni_your_token
Content-Type: application/json
{
"attribute_values": [
{
"attribute_id": "PRICE_ATTR_UUID",
"value": "49.99"
},
{
"attribute_id": "STOCK_ATTR_UUID",
"value": "true"
}
]
} Multi-Tenant Apps with Project Isolation
Each Omnismith project is an isolated namespace — its own templates, entities, members, and permissions. Use one project per client, team, or environment.
Client A Project
- • Servers template
- • Contracts template
- • Alice (admin), Bob (viewer)
Client B Project
- • Products template
- • Orders template
- • Carol (admin), Dave (editor)
Internal Project
- • HR Data template
- • Budget template
- • Full team access
Data from one project is never accessible from another. Access tokens are project-scoped.
Who Uses Omnismith as a Headless Backend
Freelancers & Agencies
Deliver client projects faster — use Omnismith as the backend for custom admin panels, CRMs, and internal tools without building an API from scratch.
Startup MVPs
Launch your product's data layer in days, not weeks. Define your schema, get an API, and iterate without migrations or backend deployments.
Internal Tool Builders
HR, finance, and ops teams need structured data with access control. Omnismith gives non-engineers a UI and engineers an API — best of both.
Companies Replacing Spreadsheets
When your team outgrows sheets but doesn't want to build a full app, Omnismith bridges the gap with structured data, RBAC, and a REST API.
Ship Your Backend Today — Not Next Month
Start free. 150 entities, REST API access, and OpenAPI spec — included forever on the free plan.