How to Combine Multiple API Responses into One JSON Without a Backend
Zero-Maintenance Backend for Frontend (BFF) on Cloudflare Edge
You do not need to spin up an Express, FastAPI, or Docker microservice just to stitch REST APIs together. RealComposer fetches multiple upstream endpoints concurrently at the edge, injects private credentials, and combines the responses into a single JSON schema with sub-10ms response times.
The Microservice Tax for Simple Aggregations
Maintaining Docker containers, Kubernetes, or Node servers just to merge 2 JSON responses introduces CI/CD overhead, server maintenance, and security patch burdens.
- High cloud hosting costs for idle microservices
- Maintaining server infrastructure for simple glue code
How RealComposer Solves This at the Edge
Add Upstream REST Steps
Configure URLs and query params for each service.
Map Keys in Visual Builder
Assemble clean output hierarchy in the browser.
Deploy Live at Edge
Publish to Cloudflare edge in 1 click.
{
"serviceA": {
"name": "Leanne",
"email": "sincere@april.biz"
},
"serviceB": {
"title": "Edge Computing"
}
}
{
"author": {
"name": "Leanne",
"email": "sincere@april.biz"
},
"article": {
"title": "Edge Computing"
}
}
curl -X GET "https://realcomposer.com/v1/acme/combined-feed"
Developer Questions & Troubleshooting
How many APIs can I merge into one?
RealComposer supports running multiple parallel steps concurrently via Promise.all.
Deploy this Any Frontend / Mobile + REST APIs, Microservices Recipe
Clone this pre-configured pipeline into your RealComposer workspace in one click. We pre-populate upstream URLs, headers, and mapping rules.