Data

JSON test files, any size.

Set a size and generate a structurally valid JSON immediately. Nothing is uploaded and nothing is stored.

0bytes
Exact size

JSON, built to spec.

Each file is a valid JSON document with a records array. The size you ask for is reached with a trailing string field, so the document still parses, so the result opens in jq, browser devtools, Python's json module and Node's JSON.parse. Most people generate these for testing API payload limits and request body caps.

Common sizes

Pick a size to jump straight to it, or set your own on the caliper above.

1 KB JSON

1,024 bytes

5 KB JSON

5,120 bytes

10 KB JSON

10,240 bytes

50 KB JSON

51,200 bytes

100 KB JSON

102,400 bytes

500 KB JSON

512,000 bytes

1 MB JSON

1,048,576 bytes

2 MB JSON

2,097,152 bytes

3 MB JSON

3,145,728 bytes

5 MB JSON

5,242,880 bytes

10 MB JSON

10,485,760 bytes

15 MB JSON

15,728,640 bytes

20 MB JSON

20,971,520 bytes

25 MB JSON

26,214,400 bytes

50 MB JSON

52,428,800 bytes

100 MB JSON

104,857,600 bytes

200 MB JSON

209,715,200 bytes

500 MB JSON

524,288,000 bytes

1 GB JSON

1,073,741,824 bytes

2 GB JSON

2,147,483,648 bytes

Questions.

How small can a JSON file be?

About 60 bytes. Below that the format cannot carry its mandatory structure, let alone padding.

Will the file open normally?

Yes — it opens in jq, browser devtools, Python's json module and Node's JSON.parse, because the padding lives in a trailing string field, so the document still parses.

Can I ask for an unusual size?

Any byte count above the minimum works, including values like 3,145,728 or 27.5 MB. Drag the caliper or type the number.

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