REST APIs are simple to build and easy to build badly. The patterns that make them maintainable aren't obvious.
RESTful API design, versioning strategy, authentication patterns, and the documentation that makes APIs consumable — built with the conventions that developers expect and the security that production APIs require.
Application with a REST API that's inconsistent, undocumented, lacks proper authentication, or has security vulnerabilities in how it handles user data
REST APIs look simple: HTTP methods, JSON responses, status codes. The patterns that make APIs maintainable and secure — consistent resource naming, proper authentication, rate limiting, documentation — are where most custom APIs fall short.
Inconsistent conventions. APIs that mix camelCase and snake_case, use different status codes for similar errors, and don't follow RESTful resource conventions are painful to consume. Developers building on the API (whether internal or third-party) spend time learning idiosyncrasies instead of building.
Authentication gaps. REST APIs that use the same session cookie auth as the web application are fine for same-origin requests. APIs consumed by mobile apps, third-party integrations, or webhooks need API key authentication or OAuth. API keys stored in plaintext in the database are a security vulnerability.
No rate limiting. Unauthenticated or unlimited endpoints are a denial-of-service risk and a cost risk. Rate limiting per IP or per API key is required for any publicly accessible API.
No documentation. APIs without documentation force every consumer to read the source code. OpenAPI/Swagger specification serves as documentation and enables client SDK generation.
Inconsistent error responses. { error: "something went wrong" } vs. { message: "not found" } vs. HTTP 500 with no body — inconsistent error responses make error handling in clients fragile.
REST API with consistent conventions, proper authentication, rate limiting, OpenAPI documentation, and the security controls that production APIs require
Resource design
RESTful resource naming conventions (`/api/v1/users`, `/api/v1/users/:id/orders`). HTTP method semantics (GET/POST/PUT/PATCH/DELETE). Consistent JSON response structure.
Authentication
Clerk JWT verification for user-authenticated endpoints. API key authentication for service-to-service or third-party access. API keys hashed (SHA-256) before storage.
Rate limiting
Per-IP rate limiting via Upstash Redis. Per-API-key rate limits. 429 response with Retry-After header.
Error handling
Consistent error response format with `code`, `message`, and `details`. HTTP status codes used correctly. Validation errors with field-level detail.
OpenAPI documentation
OpenAPI 3.0 specification generated from route definitions. Swagger UI for interactive documentation. Versioning strategy.
One honest number to start.
Fixed-scope, fixed-price. The number below is the starting point — final scope is built from your brief.
REST API with consistent conventions, proper authentication, rate limiting, OpenAPI documentation, and the security controls that production APIs require
Three steps, every time.
The same repeatable engagement on every project. No surprises, no mystery, no billable ambiguity.
Brief & discovery.
We send you questions, then get on a call. Output: a written scope with every step, feature, and integration listed.
Build & ship.
Fixed schedule, weekly reviews. No scope creep unless you change the scope — and if you do, we reprice it transparently.
Warranty & retainer.
30-day warranty on every launch. Most clients stay on a monthly retainer for ongoing features and maintenance.
Why Fixed-Price Matters Here
REST API scope is defined by the resource types and the authentication requirements. Fixed price.
Related engagements.
GraphQL is the right choice for complex APIs with multiple clients. It's also frequently the wrong choice.
Read more02When your customers' developers want to integrate your product into their stack, you need an API.
Read more03Enterprise customers want to pull your data into their own systems.
Read moreQuestions, answered.
URL versioning (`/api/v1/`) is the most visible and the most common. Header versioning (`Api-Version: 2024-01`) is cleaner but less transparent. URL versioning is the recommendation for most APIs. Implement versioning before the first external consumer — it's much harder to add after.
API keys are the right choice for most applications. OAuth 2.0 is correct for APIs where users need to authorize third-party applications to act on their behalf (the Twitter/GitHub app authorization model). The choice depends on whether users need to grant delegated access or whether the API key holder acts as themselves.
Part of the application build. Full application from $25k. Fixed-price.
Tell Ryel about your project.
Describe what you’re building and what outcome you need. You’ll have a written, fixed-price scope within the week.