JSONMockAPI - Free Fake REST API for Testing & Prototyping

Introduction

JSONMockAPI is a lightweight mock-data API service for developers and QA teams. Use JSONMockAPI to generate test data (users, products, orders, transactions, vehicles, and custom json templates) with tools to export test data as JSON, Excel (XLSX/CSV), or SQL scripts, you can generate mock datasets tailored for API testing, database seeding and rapid prototyping.

Base Endpoint

https://fake.jsonmockapi.com

To verify the api service status, send a simple GET request to https://fake.jsonmockapi.com/ping

Auth API

The Auth API provides mock authentication endpoints for testing login flows, handling both valid and invalid credentials. This endpoint is useful for testing login forms, verifying error handling use cases for invalid credentials, simulating token-based authentication, and mocking frontend auth flows.

https://fake.jsonmockapi.com/auth/login

Sample Request for a Successful login

Returns a 200 OK response with a valid mock jwt token and logged in user details

fetch('https://fake.jsonmockapi.com/auth/login', {
        method: "POST",
        headers: {
            "Content-Type": "application/json"
        },
        body: JSON.stringify({
            email: "user@example.com",
            password: "Password123"
        })
    })
   .then(response => response.json()
   .then(data => { console.log("Response:", data); }) 
})

Sample Request for a invaid login

Returns a 401 Unauthorized response, the status code can be changed based on the usecase. For example, calling /auth/login/401 returns a 401 Unauthorized, while /auth/login/403 would return a 403 Forbidden to simulate other authentication failures

fetch('https://fake.jsonmockapi.com/auth/login/401', {
        method: "POST",
        headers: {
            "Content-Type": "application/json"
        },
        body: JSON.stringify({
            email: "user@example.com",
            password: "unknown"
        })
    })
    .then(response => response.json())
    .then(data => {console.log("Response:", data); }) 
})

Users API

Mock data for user profiles including name, email, username,address and other details with support for GET,POST,PUT,DELETE. Useful for populating user grids, profile lists,user search/filter features, and any UI that requires user information.

https://fake.jsonmockapi.com/users

Products API

Generate mock product data including product name, description, price, category, SKU, images, and stock level. This data can be used to quickly populate e-commerce product grids, catalog pages, admin product listings, search and filter modules, and anywhere you need product information for development, testing, or demos.

https://fake.jsonmockapi.com/products

Orders API

The Order API returns mock order data with customer info, items, payment details, and tracking data for testing order history and invoice.

https://fake.jsonmockapi.com/orders

Transactions API

The Transaction API returns mock payment transaction data, including transaction ID, payment method, amount, currency info, status, and timestamp. Useful for testing transaction history pages, finance dashboards, invoices and error-handling flows like failed or pending payments.

https://fake.jsonmockapi.com/transactions

Vehicles API

The Vehicle API returns mock vehicle information, including the manufacturer, model, production year, VIN, color, and price. This data is ideal for testing vehicle listings.

https://fake.jsonmockapi.com/vehicles

Custom API

The Custom API allows you to generate fully customized mock data by defining your own fields and their data types. This lets you build mock responses that match your application requirements exactly. Keys in the JSON body represent the desired field names, and the values specify the data types the API should generate.

https://fake.jsonmockapi.com/custom

Basic Example

fetch('https://fake.jsonmockapi.com/custom?size=5', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({
        "number": "number",
        "guid": "guid",
        "firstname": "firstname",
        "middlename": "middlename"
    })
})

Output Size

?size=n → Root-level objects (max 25)
?nestedSize=n → Items inside nested arrays (max 25)

Nested Example

Returns 2 root objects with 3 nested products each.

fetch('https://fake.jsonmockapi.com/custom?size=2&nestedSize=3', {
    method: 'POST',
    headers: {
        'Content-Type': 'application/json'
    },
    body: JSON.stringify({
        "firstname": "firstname",
        "product": [{
            "name": "product.name",
            "description": "product.description"
        }]
    })
})

Supported Field Types

Basic: number, guid, word, sentence, paragraph, color
Personal Info: firstname, middlename, lastname, gender, email, phone, username, password, ssn
Location & Address: city, state, country, zipcode, address, latitude, longitude
Date & Time: date, datetime, year
Business: company, job
Product: product, product.name, product.description, product.category, price, image, thumbnail
Payment & Transactions: payment, transaction-status, currency, creditcard
Order: order.status