Glossary · Web & App Development
REST API
Overview
What a REST API actually is
A REST API (representational state transfer) is a set of rules for how one piece of software requests data or actions from another over the web. Instead of sharing a database directly, systems expose named endpoints, web addresses that return or accept information. This lets a mobile app, website, and third-party tool all pull from the same backend without knowing how it is built.
How REST APIs work
Each request uses a standard HTTP method: GET to read, POST to create, PUT or PATCH to update, and DELETE to remove. The server responds with a status code and a data payload, almost always in JSON. REST is stateless, meaning every request carries everything the server needs, which makes APIs easier to scale, cache, and secure with tokens or API keys.
Why REST APIs matter for your business
REST APIs are how modern products connect: your CRM to your website, your app to a payment processor, an AI agent to your internal data. A well-designed API turns a single system into a platform other tools can build on. In backend and app development work, clean REST endpoints also make automation practical, since n8n, Zapier, and workflow tools all speak to systems through APIs.
Where we use it
Related Zen in Tech services
How our team puts REST API to work in real projects.
FAQ
REST API — common questions
REST API vs GraphQL, what's the difference?
REST exposes many fixed endpoints that each return a set data shape, while GraphQL uses a single endpoint where the client requests exactly the fields it needs. REST is simpler and universally supported; GraphQL reduces over-fetching for complex, data-heavy apps.
Do I need a REST API for my project?
If your website, mobile app, or third-party integrations need to share data with a backend, yes. Almost every modern web or app product relies on APIs to move data between the front end, the database, and outside services.
Is REST still relevant?
Yes. REST remains the most common API style on the web because it is simple, cacheable, and universally supported. Newer options like GraphQL and gRPC complement it for specific needs rather than replacing it.
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