Your default WordPress API does not expose your custom post types or ACF fields. Your "API" is template files echoing JSON — unsecured and breaking on updates. That is not an API — it is a vulnerability. We are a wordpress api company specializing in custom wordpress api development that fixes this. As experienced wordpress api developers, we build proper REST endpoints with authentication. Wordpress api integration services that actually work. 50+ projects delivered. Live in days.
No vague promises. Here is precisely what we build, configure, and hand over.
A wordpress api company should build endpoints that are secure, maintainable, and documented — not hacked together on template files that break on the next update. The default WordPress REST API exposes posts, pages, users, and media. It does not expose your custom post types, your ACF field data, your WooCommerce orders, your membership tiers, or the proprietary business data your application is actually built around. Ad-hoc JSON responses from template files are not an API — they are a security incident waiting to happen.
At Softileo, we deliver custom wordpress api development that is fundamentally different. As wordpress api developers, we build using WP_REST_Controller classes and register_rest_route — proper namespacing, permission callbacks, sanitized input, escaped output, rate limiting where needed. Our wordpress api integration services cover headless WordPress, mobile app backends, third-party integrations, and webhook receivers — all with full authentication and documentation. This is an API you can trust.
We do not guess. We specify first — API specification document delivered before any code is written. Every endpoint defined: HTTP method, route, authentication requirement, request parameters, response schema, and error responses. You approve. Your frontend team can start building against the spec immediately — parallel development, faster time to launch. Then we build: WP_REST_Controller classes, permission callbacks, JWT authentication, sanitization, response formatting. GraphQL schema extensions where applicable. Security testing — auth enforcement, input validation, rate limiting, CORS configuration. Then full documentation: Postman collection or Swagger spec delivered. Your team integrates without guessing.
The ROI is both immediate and architectural. A headless WordPress project without a proper API layer costs weeks of rework — frontend waiting for endpoints, backend rewriting responses, authentication bolted on as an afterthought. With specification-first custom development, frontend and backend work in parallel, not sequence. The project ships weeks faster. And the security case: ad-hoc JSON endpoints from template files are routinely exploited — exposed private data, unauthenticated writes, injection attacks. A proper API with permission callbacks and JWT tokens closes those vectors entirely.
Every month you use hacked-together JSON endpoints is another month your data is exposed. Another month your frontend team waits for endpoints to be fixed. Another month you cannot upgrade WordPress because the "API" will break. The gap between sites with proper API layers and those with ad-hoc hacks is widening — and it shows in security incidents and development velocity.
New REST routes registered using register_rest_route and WP_REST_Controller — properly namespaced, versioned, structured. Exposing custom post types, ACF fields, user data, WooCommerce data, or any proprietary WordPress data.
JWT authentication with token refresh, OAuth 2.0, or Application Passwords configured for your security model. Every protected endpoint gated by a permission callback. No private data without valid token.
Complete API layer for decoupled frontends — Next.js, Nuxt, React, Vue. Custom endpoints shaped to exactly what the frontend needs, ISR-compatible responses, preview mode for draft content.
Custom GraphQL types, queries, and mutations built on WPGraphQL — extending the schema with custom post types, ACF field data, WooCommerce queries, and proprietary data.
WordPress as the backend for iOS and Android apps — user registration and authentication, content delivery, push notification triggers via FCM/APNs, in-app purchase handling.
Incoming webhooks from Stripe, HubSpot, Zapier — processing correctly with validation, error handling, idempotency. Outgoing API calls triggered by WordPress events, with retry logic.
All inputs sanitized. All outputs escaped. Rate limiting per endpoint. CORS headers set correctly for allowed origins. No endpoint leaks data it should not.
Full Postman collection or Swagger/OpenAPI specification delivered — request format, authentication headers, response schema, example responses. Your frontend team imports and integrates immediately.
Hand-coded WordPress is not for everyone. Here is an honest breakdown of when it delivers clear ROI.
Across every industry, the underlying need is the same: a secure, documented API that serves exactly the data your application needs in exactly the shape it expects. Our custom wordpress api development provides that regardless of sector — the only thing that changes is the data model and authentication requirements.
The ROI is measurable. Here is what businesses consistently report after proper API implementation:
We have delivered 50+ API projects for clients across the US, UK, and Australia. Top Rated on Upwork (5.0) and Fiverr (4.9) — ratings earned by building APIs that frontend teams actually want to integrate against, not ones that require constant support.
What separates our wordpress api integration services from generalist development shops is simple: we follow WordPress coding standards, we document everything, and we specify before we build. Your frontend team is not waiting on us — they are building in parallel.
Fixed price. Specification-first. 90-day warranty. 4.9-star rating across 180+ client reviews.
Complete REST/GraphQL API for Next.js, Nuxt, or React frontends — custom endpoints, preview support, ISR-compatible.
WordPress as iOS/Android backend — user auth, content delivery, push notifications, in-app purchases.
Custom endpoints exposing orders, products, customers, inventory to ERPs, dashboards, and fulfilment systems.
Bi-directional sync with HubSpot, Salesforce, Mailchimp — contacts, forms, events, all via authenticated APIs.
Read endpoints exposing WordPress and WooCommerce data to BI tools, analytics dashboards, and internal systems.
Stripe, PayPal, Twilio, HubSpot webhooks — validated, processed, and triggering WordPress actions with retry logic.
"We had a mobile app developer who needed a proper WordPress API backend. Our previous developer had built endpoints as template files that just echoed JSON — completely unsecured and breaking constantly. Softileo rebuilt the entire API layer properly, added JWT authentication, and documented every endpoint in Postman. The mobile team integrated in two days. It has been running without a single issue for over a year."
From first call to live site — a clear process with no surprises, no delays, and a hand-coded WordPress site at the end.
We deliver custom wordpress api development in 8-14 days from kickoff. Specification first — because the API contract needs to be agreed before a single endpoint is coded. Then a focused build sprint. Then thorough security testing and documentation. An API your frontend team can integrate against immediately, with confidence. We have delivered 50+ API projects — we know exactly what works.
Our proven 6-step process:
1. Discovery: Free 60-min session. We map your application architecture, the data the API needs to serve or receive, authentication model, rate limiting requirements, and the consuming applications — frontend, mobile app, or external system.
2. API Specification: Written API specification delivered — every endpoint defined with HTTP method, route, authentication requirement, request parameters, response schema, and error responses. The shared contract your frontend team can begin building against before the WordPress side is coded.
3. Scope & Quote: Fixed-price quote based on the approved API specification. Every endpoint, integration, and authentication flow costed. No scope creep, no mid-build surprises. Full project cost confirmed in writing before build begins.
4. API Build: Custom endpoints built as WP_REST_Controller classes using register_rest_route — proper namespacing, permission callbacks, sanitization functions, schema validation, and response formatting. JWT or OAuth authentication implemented. GraphQL schema extensions via WPGraphQL where applicable. All built and tested on staging.
5. Security Testing & QA: Every endpoint tested for correct authentication enforcement, proper input sanitization, accurate response schemas, and correct error handling. Rate limiting verified. CORS configuration tested from real consuming origins. Common API attack vectors — injection, enumeration, broken auth — all checked.
6. Launch & Handover: API deployed to production. Full Postman collection or Swagger/OpenAPI documentation delivered with example requests and responses. Integration support session with your frontend or mobile development team. 90-day warranty begins.
Free 60-min call. Application architecture, data requirements, authentication needs, and API consumers all mapped.
Written spec: every endpoint, HTTP method, auth, request params, response schema, and errors defined. You approve.
Fixed-price quote based on approved spec. Every endpoint costed. Full cost confirmed before build begins.
WP_REST_Controller endpoints, permission callbacks, sanitization, auth, and GraphQL extensions on staging.
Auth enforcement tested, inputs validated, rate limiting verified, CORS tested, API vulnerabilities checked.
Deployed to production. Postman/Swagger docs delivered. Integration support session. Warranty starts.
No 6-month timelines. No endless meetings. We build fast, test thoroughly, and launch when it\'s ready — typically within 7-10 days.
Free 60-min session. We map your application architecture, data needs, authentication model, and consuming applications.
Day 1Written API specification delivered — every endpoint defined with method, route, auth, request params, response schema. Your frontend team can start building against it immediately.
Day 1-3Fixed-price quote based on approved specification. Every endpoint costed. Full project cost confirmed before build begins.
Day 3WP_REST_Controller endpoints, permission callbacks, sanitization, JWT auth, GraphQL extensions — all built on staging.
Day 3-10Auth enforcement tested, inputs validated, rate limiting verified, CORS tested, API vulnerabilities checked.
Day 10-13Deployed to production. Postman/Swagger docs delivered. Integration support session. 90-day warranty begins.
Day 13-14Still not sure? Ask us anything — we reply within 24 hours.
Get Free QuoteEvery month you use template files as an "API" is another month your data is exposed. Every week your frontend team waits for endpoints to be fixed is another week of delayed launch. Book a free 60-minute discovery call. We will map your application needs, deliver an API specification your frontend team can start building against immediately, and send a fixed-price quote for custom wordpress api development within 24 hours. Most APIs are live and documented within 14 days.
No credit card required. We respond within 24 hours.
