A mock API is a fake REST API that returns sample data for testing and development. Mock APIs let frontend developers, QA teams, and product managers test integrations without a real backend. apismaker lets you create mock APIs in 60 seconds from JSON, Excel, or CSV — no code required.

How do I create a mock API for free?

Sign up at apismaker.com, pick a template or import your data (JSON, Excel, CSV), and get instant REST endpoints. No code required. You can try our free mock API demo without signing up.

What is the best free mock API generator?

apismaker is a free mock API generator that lets you create REST APIs in 60 seconds. Import JSON, Excel, or CSV. No code required. Try the demo without signup.

How do I create a fake API for testing?

Use apismaker to create a fake API for testing. Import your data (JSON, Excel, CSV) or pick a template. Get instant REST endpoints. No backend required.

Can I turn Excel into an API?

Yes. apismaker converts Excel, CSV, and JSON files into REST APIs. Upload your file, map columns to entity fields, and get working endpoints in 60 seconds.

What is a no-code API builder?

A no-code API builder lets you create APIs without writing code. apismaker is a no-code API builder. Import data or use templates to get REST endpoints instantly.

How do I create a mock API for React or frontend development?

Use apismaker to create a mock API for frontend development. Get REST endpoints in 60 seconds. No backend needed. Test your React app against real-looking API responses.

JSON to API: Step-by-Step Guide

March 4, 2026

You have JSON data — maybe from an export, a backup, or a sample dataset. Here's how to expose it as a REST API so you can query, filter, and share it.

Step 1: Prepare your JSON

Your JSON should be an array of objects or a single object. apismaker parses both. Ensure the structure is consistent so the entity schema maps correctly.

Step 2: Create an API with matching entities

Define an API and add entity fields that match your JSON keys. For nested data, use dot notation (e.g. address.city) in the mapping step.

Step 3: Upload and map

Upload your JSON file in the Data Import section. Map the JSON paths to your entity fields. Preview the first rows to confirm the mapping.

Step 4: Query your API

Your JSON is now a live API. Use query parameters for filtering, pagination, and sorting. Call it from your frontend, Postman, or any HTTP client.

JSON to API: Step-by-Step Guide

Step 1: Prepare your JSON

Step 2: Create an API with matching entities

Step 3: Upload and map

Step 4: Query your API

Try it yourself