Object Storage API — free mock REST API for testing

Practice object metadata, base64 content, checksums, Range requests and resumable upload state.

The Object Storage API is a small S3-shaped surface: PUT an object, GET it back, and verify it. It is the only place in the catalog that serves HTTP 206 Partial Content for a Range request and 416 when that range cannot be satisfied — plus checksum validation and resumable uploads, the three things object-storage clients get wrong most often.

Base URL: https://funapi.dev/api/storage/v1 · 4 endpoints · OpenAPI 3.1 spec and Postman collection available. New here? Read the getting started guide.

Example request and response

GET https://funapi.dev/api/storage/v1/objects — List stored objects. No token, no signup:

curl -i https://funapi.dev/api/storage/v1/objects

answers 200 OK with:

{
  "total": 0,
  "data": []
}

Open and run this endpoint

What you can practise here

Request a byte range and read the 206 together with its Content-Range header.
Ask for a range past the end of the object and handle the 416.
Upload with a deliberately wrong checksum and confirm the object is rejected, not silently stored.
Start a resumable upload, interrupt it, and resume from the offset the API reports.

objects

stored test files

GET /storage/v1/objects — List stored objects · Responds with 200 Link to this endpoint
PUT /storage/v1/objects/{key} — Upload a base64 object with checksum (requires Bearer auth) · Responds with 201 412 422 Link to this endpoint
GET /storage/v1/objects/{key} — Download object metadata/content; accepts Range · Responds with 200 206 416 Link to this endpoint
DELETE /storage/v1/objects/{key} — Delete an object (requires Bearer auth) · Responds with 204 404 Link to this endpoint

uploads

resumable sessions

Auth Playground API — OAuth 2.0 flows — client credentials, auth code, refresh & expiry.
Webhooks API — Register callbacks, trigger events, inspect & replay deliveries.
Protocol Lab API — Async jobs, redirects, 503/504, JSON Patch & content negotiation.
Modern Identity API — OIDC discovery, PKCE, device codes & token lifecycle.

All 39 mock REST APIs

Use this response elsewhere

JSON to TypeScript on fundata.dev — an interface for this response
JSON to Zod on fundata.dev — a runtime validator for it
mock API data on fundata.dev — thousands of records of the same shape for your own fixtures

Last updated 2 October 2026