Instant mock JSON API

MockJSON_
API

Instant, zero-config REST endpoints for frontend work. Create a bin, get a URL, and keep shipping while the real backend is still a ticket in a backlog.

Cloudflare edgeD1 + R215+ tools2026

Open MockJSON ↗Read the process

dashboard / bins / elspm14live

GET/api/bin/elspm14200 OK24ms

 1  {
 2    "status": "ok",
 3    "endpoint": "/api/bin/elspm14",
 4    "latency": 24,
 5    "requests": 148205,
 6    "metrics": {
 7      "errorRate": "0.01%",
 8      "activeWorkers": 12
 9    },
10    "items": [
11      { "event": "token.rotated" },
12      { "event": "replica.synced" }
13    ]
14  }

● synchronized148,205 requests0.01% errors12 workers

POST · PUT · DELETEno deploy

01 — The bottleneck

The frontend should not wait for the API.

Most prototypes stall in the same place: the interface is ready, but the endpoint does not exist yet. MockJSON shortens that gap from days to seconds by giving every bin a real URL that returns the JSON you wrote.

Without a mock

days

Design

Waiting on backend

Build

With MockJSON

20 seconds

Design

Endpoint in 20s

Build

02 — How it works

Create. Point. Edit.

Three steps, no infrastructure to own. The dashboard is the backend.

01 / Create

Make a bin

Start with 10 public bins on the free plan. Each one holds up to 100 KB of JSON.

POST /api/bin
→ 201 Created

02 / Point

Use the URL

Drop the endpoint into fetch, React Query, or whatever your app already uses.

const res = await fetch(
"/api/bin/elspm14"
);

03 / Edit

Change the data

Edit keys in the dashboard and the live view updates. The endpoint returns the new shape immediately.

"totalRequests": 148205
// edits apply live

03 — Under the hood

Small surface.
Real edge.

MockJSON is not a static placeholder. Bins live on Cloudflare's edge with D1 for structured data and R2 for object storage, so requests stay fast without a server to maintain.

Read the feature list ↗

Client

fetch()

React, Vue, mobile, or curl

TLS

Edge

Cloudflare

Anycast routing, global cache

SQLite bins

Object storage

24ms

p50 latency

148k

requests

0.01%

error rate

workers

04 — The workbench

15+ tools.
Zero uploads.

Converters, formatters, and inspectors that run entirely in the tab. The data never touches a server.

Convert

JSON → CSV→
JSON → TypeScript→
YAML → JSON→
JSON → Query→
JSON → Go→
JSON → Python→

Inspect

Formatter→
Minifier→
Tree Viewer→
JSONPath Tester→
JSON Diff→
Schema Generator→

Translate

JSON → C#→
JSON → Java→
JSON Validator→

Your data never leaves the tab

Input JSON → local transform → output. No upload, no queue, no server round trip.

0 bytes sent

05 — Limits, honestly

Free is useful.
Pro is unsurprising.

No trial countdown, no credit card for the free tier. The limits are written down before you sign up.

Free

no card

Public bins10
Storage per bin100 KB
Requests1,000 / day
Retention7 days
Write accessGET

Pro

$9/mo

for real work

Private binsBearer token
StoragePermanent
Write accessFull
Version history100
LimitsHigher

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