20 MB JSONL sample

A JSONL file of exactly 20,971,520 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 20 MB sample, test or dummy JSONL file.

sample-jsonl-20mb.jsonl

20 MB20,971,520 bytes

Download 20 MB JSONL

Created in your browser in a few seconds, then checked against the SHA-256 checksum. No sign-up.

Type: application/jsonl
SHA-256: 0ec40c693c43634b1d269b42bc8c1b377030deb54d6fd958fe078fe47acdfcab
Delivery: Created in your browser from static generator assets (how it works).

What is in this file

60,993 JSON objects, one per line, followed by one short object whose "note" string is lengthened to reach the exact size.

Lines	60,994
Records per line	1
Encoding	UTF-8 (ASCII characters only)
Line endings	LF

How the file begins

The opening lines of sample-jsonl-20mb.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 its first 64 KB.

Where 20 MB matters

A 20,971,520-byte file: right at the default attachment limit of Outlook, and just under the 25 MB ceilings of Gmail and GitHub web uploads. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Microsoft Outlook	20 MB of attachments by default for internet mail accounts	This file is right at the limit; add a second attachment and it is exceeded.
Gmail	25 MB per message	Under the limit, although email encoding adds about a third in transit.
GitHub web uploads	25 MiB per file added through the browser	Accepted. Pushing with Git allows larger files.
Cloudflare Pages assets	25 MiB per file	The largest round size that can be served as a static asset.
Amazon API Gateway	10 MB payload	Rejected; the upload has to go directly to object storage.
ASP.NET Core (Kestrel)	About 28.6 MB request body by default	Accepted with room for the multipart overhead.

All 20 MB sample files

Use this file for

Measuring download speed from your own server or CDN
Checking log processors
Testing streaming parsers

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-20mb.jsonl
Format	JSONL (JSON Lines)
Extension	.jsonl
MIME type	application/jsonl
Size	20,971,520 bytes (20 MB)
Kind	Text
SHA-256	0ec40c693c43634b1d269b42bc8c1b377030deb54d6fd958fe078fe47acdfcab
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-20mb.jsonl     # Linux
shasum -a 256 sample-jsonl-20mb.jsonl # macOS

On Windows, run Get-FileHash sample-jsonl-20mb.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 20 MB?: Yes. It is 20,971,520 bytes, which is 20 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 20 MB JSONL file?: 60,993 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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