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lookup> .jsonl

.JSONL·File Extension

JSON Lines File — Newline-delimited JSON, one JSON object per line for streaming large datasets.

Data & Text

Quick facts

Extension.jsonl
File typeJSON Lines File
MIME type—
CategoryData & Text
Charset—
Compressible—
Format familyjson

What is .jsonl

What is a .jsonl file?

A .jsonl file is a JSON Lines File — Newline-delimited JSON, one JSON object per line for streaming large datasets.

In the mime-db registry it has no registered standard MIME type. When serving this file over HTTP, use a Content-Type that matches its actual format.

How to open .jsonl files

  • Use jq or VS Code to open and edit .jsonl files.
  • Any text editor (Notepad, VS Code) can inspect the raw content as text.

Developer info

When served over HTTP, responses should set the following header:

# No standard MIME type is registered for .jsonl

Common software that reads/writes .jsonl:

jqVS CodePython

Relation chain

.jsonlextension of
format
jsonserved as
mime type
—sent via header
http header
Content-Type

Related extensions

.json
JSON Data File
.ndjson
NDJSON Data File
.json5
JSON5 Configuration File
.geojson
GeoJSON Data File

Related programming languages

JSON
.json .4DForm .4DProject

Common uses

  • Configuration files
  • Data interchange between systems
  • API request and response payloads
  • Logs and data exports

How to edit .jsonl files

  • Open the file with jq, make your changes and save.
  • Most editors preserve the original formatting and encoding — avoid changing the charset.

How to create .jsonl files

  • Create a new file and save it with the .jsonl extension, or export this format from jq.

Frequently asked questions

What programs can open .jsonl files?

Common options include jq, VS Code, Python. You can also open many of these files with built-in viewers or a browser.

How do I create a .jsonl file?

Create a new file in any text editor or the app that owns the format and save it with the .jsonl extension.

Sources & standards

Updated 2026-09-13

Explore this reference

Related extensions

.json
JSON Data File
.ndjson
NDJSON Data File
.json5
JSON5 Configuration File
.geojson
GeoJSON Data File

Related programming languages

JSON
.json .4DForm .4DProject

Related headers

Content-Type
HTTP header
Accept
HTTP header

Related methods

GET
HTTP method
POST
HTTP method
PUT
HTTP method
PATCH
HTTP method

Related status codes

200
OK
404
Not Found

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About This Tool

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