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Mock JSON Generator
Describe a shape and get as many rows of matching JSON as you need.
Field types
Anything not in this list is copied through as a literal, which is how you pin a constant.
Quick Tool Overview
The Mock JSON Generator takes a template describing the shape you want and returns as many rows of matching JSON as you ask for — nesting objects, repeating arrays and copying literals through unchanged.
- What it does
- Generates mock JSON from a shape you describe
- You give it
- A JSON template and a row count
- You get back
- Real JSON matching that shape
- Best for
- Building a fake API response before the API exists
About the Mock JSON Generator
Write a template describing the shape you want, using a field type as each value, and get back as many rows of real JSON as you ask for. It is the fastest way to produce a believable API response before the API exists.
The template is itself JSON, so nesting works the way you would expect: an object inside an object produces nested data, and an array containing one template produces a list of that shape. Field types cover names, contact details, addresses, dates, numbers, booleans, identifiers and lorem text. Anything that is not a recognised type is treated as a literal, so fixed values and enums are just written in place.
Key features of the Mock JSON Generator
The template is JSON
So nesting works the way you would expect, with no separate schema language to learn.
Arrays of a shape
One template object inside an array produces a list of that shape, with a length in the range you set.
Literals pass through
Anything not recognised as a field type is copied unchanged, which is how you pin a version or an enum value.
Every field type
Names, emails, addresses, dates, numbers, prices, booleans, identifiers and lorem text.
Ready to serve
The output is valid JSON, so it drops straight into a fixture file or a mock server.
How to use the Mock JSON Generator
-
1
Write your template
A JSON object where each value names a field type, such as "fullName" or "price".
-
2
Nest as needed
Objects nest; an array with one item inside becomes a list of that shape.
-
3
Set the count
How many top-level rows to produce.
-
4
Copy the JSON
Formatted and ready for a fixture, a mock server or a prototype.
Frequently asked questions
Just nest them in the template. An object value produces an object with the same shape, to any depth.
Put one template object inside an array. Each row then gets an array of that shape, with a random length within the bounds you set.
Write it literally. Anything the generator does not recognise as a field type is copied through unchanged, which is how you set a constant or a version number.
It produces the body; a mock server also handles routes, status codes and latency. Generate the body here and paste it into whatever is serving it.
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