500 KB JSONL sample

A JSONL file of exactly 512,000 bytes. It is a valid JSON Lines file, generated by this site. Compare its checksum and test it with the parser used by your application. Use it wherever you need a 500 KB sample, test or dummy JSONL file.

sample-jsonl-500kb.jsonl

500 KB512,000 bytes

Download 500 KB JSONL

Created in your browser in a few seconds, then checked against the SHA-256 checksum. The file is not uploaded anywhere. No sign-up.

Type: application/jsonl
SHA-256: 877cc7d3400cc4db56189ace7187b40c6f51df143fda3b1caa7fde6a051b5bf1
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

1,502 JSON objects, one per line, followed by one short object whose "note" string is lengthened to reach the exact size.

Lines	1,503
Records per line	1
Encoding	UTF-8 (ASCII characters only)
Line endings	LF

How the file begins

The opening lines of sample-jsonl-500kb.jsonl, exactly as they appear in the file.

00000000  7b 22 69 64 22 3a 31 2c  22 75 75 69 64 22 3a 22 |{"id":1,"uuid":"|
00000010  34 37 66 36 36 36 33 30  2d 39 63 65 33 2d 34 31 |47f66630-9ce3-41|
00000020  66 30 2d 62 38 38 32 2d  39 66 35 63 36 64 30 31 |f0-b882-9f5c6d01|
00000030  30 37 37 30 22 2c 22 6e  61 6d 65 22 3a 7b 22 66 |0770","name":{"f|

Preview

Creates the file in your browser and shows the first 64 KB of it.

Where 500 KB matters

A 512,000-byte file: larger than most API body limits, smaller than most upload limits. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Amazon DynamoDB items	400 KB per item	500 KB cannot be stored as a single item.
Express body parsers	100 KB by default	Rejected unless the limit is raised.
nginx request body	1 MB by default (client_max_body_size)	Accepted with room to spare.

All 500 KB sample files

Use this file for

Checking email size handling
Loading datasets for machine-learning experiments
Testing bulk import endpoints

Testing notes for JSONL

A blank line or a trailing comma on any line breaks strict readers, so decide how your importer treats them.
Passing the whole file to a standard JSON parser fails, because the file as a whole is not one JSON value.

JSONL format reference

Technical details

File name	sample-jsonl-500kb.jsonl
Format	JSONL (JSON Lines)
Extension	.jsonl
MIME type	application/jsonl
Size	512,000 bytes (500 KB)
Kind	Text
SHA-256	877cc7d3400cc4db56189ace7187b40c6f51df143fda3b1caa7fde6a051b5bf1
Created	2026-10-23
Validation	See the listed size and SHA-256. Small downloads are checked in the browser; verify streamed downloads manually. A hash match does not prove parser compatibility.
Preview	Available on this page
Source	Generated in your browser by this site's generator; not copied from elsewhere
Licence	Free to use, modify and redistribute (terms)
Category	Data

Check the stated structure and checksum against your application requirements. As with any download, scan the file with your own security tools before opening it. How files are made and checked

Verify your copy

This file is created in your browser, so it has no direct URL for curl or wget. The generator is designed to produce reproducible bytes. After saving, compare the checksum with the SHA-256 value above.

sha256sum sample-jsonl-500kb.jsonl     # Linux
shasum -a 256 sample-jsonl-500kb.jsonl # macOS

On Windows, run Get-FileHash sample-jsonl-500kb.jsonl -Algorithm SHA256 in PowerShell. For scripts and pipelines, save the file once and keep your own copy.

Related files

Questions about this file

Is this file exactly 500 KB?: Yes. It is 512,000 bytes, which is 500 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 500 KB JSONL file?: 1,502 JSON objects, one per line, followed by one short object whose "note" string is lengthened to reach the exact size.
How is JSONL different from JSON?: A JSON file is one value, usually an array. A JSONL file is many values separated by line breaks, which can be appended to and read as a stream.

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