How does it know what data to generate?

It reads your TypeScript interface and generates values that match each field's type — strings, numbers, booleans, nested objects, and arrays — so the output always conforms to the shape your code expects.

Which export formats are supported?

You can export the generated data as JSON, CSV, XML, YAML, or SQL insert statements, so it fits whether you need an API stub, a spreadsheet, a config payload, or database seed data.

Can I generate more than one record at a time?

Yes. Set the record count to produce as many entries as you need — useful for testing lists, pagination, or seeding a development database with realistic volume.

Is the generated data the same every time?

The values are randomized to look realistic, so each generation produces fresh data while always respecting the types in your interface. Regenerate whenever you want a different sample set.

Is my interface or data sent anywhere?

No. Generation happens entirely in your browser, so neither the TypeScript interface you paste nor the mock data it produces is uploaded or stored.

API Response Mock Generator

Generate realistic mock data from TypeScript interfaces. Supports multiple types with customizable counts and exports to JSON, CSV, XML, YAML, or SQL formats.
context-aware dummy data generation.

Type Definitions

User

Type Name

Count

TypeScript Definition

Results

No data generated yet

Click "Generate" to create mock data for User

About API Response Mock Generator

Building a UI or testing an integration before the backend is ready means inventing data — and hand-written fixtures are tedious, drift out of sync with your types, and rarely look realistic enough to surface layout or edge-case bugs. Generating the mock straight from your TypeScript interface keeps the shape honest and the work fast.

Paste a TypeScript interface and this tool produces realistic mock records that match its fields and types. Choose how many records you want, then export them as JSON for an API stub, CSV for a spreadsheet, XML or YAML for config-style payloads, or SQL inserts to seed a database.

Because the data is derived from the interface itself, the output always conforms to the contract your code expects, which makes it useful for prototyping, demos, load-testing payloads, and populating a dev database. Everything is generated in your browser — your interfaces and the data they produce are never uploaded or stored.

How to use API Response Mock Generator

Paste your TypeScript interface
Drop in the interface that describes the response you want to mock. The fields and their types drive the generated data.
Set the record count
Choose how many mock records to generate — one for a single object, or many for a list or seed dataset.
Pick an export format
Select JSON, CSV, XML, YAML, or SQL depending on where the data needs to go — an API stub, a spreadsheet, or a database.
Copy or download
Review the generated output, then copy it or save it to use as a fixture, seed file, or API response stub.

Frequently asked questions

JSON to TypeScript Converter

Instantly convert JSON objects or arrays into clean TypeScript interfaces or type aliases.

JSON Formatter · Beautifier · Validator

Format, minify, sort keys, and validate JSON/JSONC/JSON5 with optional JSON Schema validation. Supports comments and trailing commas.

UUID Generator & Validator

Generate v1 or v4 UUIDs, validate existing ones, detect versions, and inspect v1 timestamps.

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