fake-json-data-generator
⚙ JSON Data Generator
Generate realistic JSON arrays for your tests, mockups and API demos.
Guide & Explanations
Fake JSON Data Generator: Speed Up Your Development
When developing a web application, REST API, or admin interface, one of the first friction points is the lack of realistic data. Manually filling dozens of JSON objects is time-consuming and error-prone. Our JSON Data Generator solves this problem instantly, without installation and without an account.
30+ Types of Realistic Data
Our internal generation engine (inspired by Faker.js, but 100% self-contained, no external dependencies) covers the following categories:
Identity: First Name, Last Name, Full Name, Email, Username, Avatar URL, Phone, Company, Job Title.
Location: City, Country, Full Address, ZIP Code, Latitude, Longitude.
Date & Time: ISO 8601 Date (past/present/future), Unix Timestamp.
Finance: Monetary Amount, Currency Code (EUR, USD, GBP...), IBAN.
Web & Tech: UUID v4, URL, Placeholder Image URL (Picsum), IPv4, IPv6, MAC Address, Hex Color.
Generic Data: Boolean, Number (with configurable min/max range), Float, Lorem Ipsum (configurable word count), Sentence, Word, Enum (custom fixed values), Sequential Index.
Drag and Drop to Reorder Columns
The interface allows you to reorder fields by simple drag and drop. The JSON is instantly regenerated after each modification. All your settings (fields, types, number of objects) are automatically saved in your browser's LocalStorage.
Frequently Asked Questions
Q: Is fake-json-data-generator free to use?
R: Yes, the fake-json-data-generator utility is 100% free. All tools on Dolf.in are accessible at no cost and without intrusive ads.
Q: Is my data secure?
R: Absolutely. Dolf.in uses a 'Serverless' approach: your data is processed locally in your browser and is never sent to our servers.
Q: Do I need to install any software?
R: No, no download or installation is required. Everything works directly in your web browser.
Q: What is a fake JSON data generator used for?
R: When developing an application, REST API, or user interface, you often need realistic data to test interface behaviors, fill a demo database, or prepare a presentation. This generator saves you from manually inventing hundreds of consistent data rows. It instantly produces structured JSON objects with random but plausible values.
Q: Is the generated data completely fake?
R: Yes, all data is algorithmically generated client-side (in your browser). No data is real: names, emails, addresses, and IBANs are randomly constructed and do not correspond to any real person, company, or bank account. Never use them in a production context without replacing them with authentic data.