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Random JSON Generator

Generate arrays of realistic mock JSON objects (users, products, orders, events…) for testing and prototyping.

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Random JSON Generator works straight from this page — free, instant, nothing to install. It covers users, products, orders, events — adjust any of them and the result follows immediately.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What is Random JSON Generator?

Generate arrays of realistic mock JSON objects (users, products, orders, events…) for testing and prototyping.

What does it take into account?

It factors in users, products, orders, events. Change any of them and the output follows immediately.

When would I actually use this?

Finding out how big a thing will be before you make it: how many gigabytes an hour of footage takes, how long a file needs on the connection you have, how large a photo prints before it goes soft, what bitrate fits the budget you were given.

What is the most common mistake?

Reading a figure in one unit next to a figure in another. Megabits are not megabytes and the eight-fold gap sinks most transfer estimates; a kilobyte is 1 000 bytes to a drive maker and 1 024 to the operating system; pixels are not dots per inch. None of it is hard arithmetic — the unit on each side is what decides whether the answer means anything.

How is Random JSON Generator different from CSV / TSV / JSON / YAML converter?

They sit next to each other but answer different questions. CSV / TSV / JSON / YAML converter: convert between CSV, TSV, JSON and YAML, and see the rows as a table. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

JSON String Escape / Unescape is the closest one after this: Turn raw text into a JSON-safe string and back, with control characters, \uXXXX, emoji surrogate pairs and lone surrogates handled exactly like JSON.stringify.

What else is worth having open alongside it?

Random Color Palette Generator and ASCII Table Reference — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Byte prefixes follow the IEC convention where a kibibyte is 1 024 bytes and a kilobyte is 1 000 — drive makers use the second, operating systems often report the first, and a disk that shrinks on arrival is that gap and nothing else. Print sizing assumes 300 dpi unless you change it.

Further reading

All guides →
GuideTest Data Without Real People: Why Pseudonymised Is Still Personal, and Synthetic Is NotSwapping names for identifiers does not take a database out of the GDPR — Article 4(5) and Recital 26 say so directly. Genuinely synthetic data is outside the Regulation altogether. That single distinction decides how you seed a staging environment.ExplainerThe Golden Hour and the Blue Hour Are Angles, Not HoursGolden hour runs from +6° to −4° of solar elevation and blue hour from −4° to −6°, which is why it lasts forty minutes at the equator, over an hour at mid-latitudes, and above 72.6° in June does not happen at all. The thresholds this calculator uses, checked against its own output.ExplainerDepth of Field: What Actually Controls ItFour variables set depth of field, and subject distance dominates the other three. The exact formulas, a computed table, why the circle of confusion is a decision rather than a measurement, and what "full frame has less depth of field" really means.ExplainerThe Exposure Triangle Is Three Routes to the Same StopA stop is a factor of two in light. The f-number scale is powers of √2 for a reason you can derive in one line, EV = log2(N²/t) puts a number on it, and the three controls are equivalent in brightness only — never in the picture.ExplainerJSON to CSV When the Structure Is Nested: Why There Is No Right AnswerThe same two orders come out as five columns from one converter and ten from another, and neither is wrong. Dotted paths, arrays of scalars, arrays of objects and records with different keys — four decisions, made for you, usually silently.ExplainerCrop Factor: What It Changes and What It Does NotCrop factor is a ratio of sensor diagonals. It changes framing, not the lens — proved by computing field of view both ways — and it applies to the f-number as well as the focal length, which is the half most articles leave out.