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JSON

A lightweight data-interchange format, not a programming language but ubiquitous in APIs.

data format

Quick facts

NameJSON
Aliasesgeojson, jsonl, sarif, topojson
Typedata format
Extensions.json .4DForm .4DProject .avsc .geojson .gltf .har .ice
MIME type—

What is JSON

JSON

A lightweight data-interchange format, not a programming language but ubiquitous in APIs.

GitHub Linguist classifies JSON as a data format, typically using extensions such as .json, .4DForm, .4DProject, .avsc, .geojson, .gltf.

File extensions:

.json.4DForm.4DProject.avsc.geojson.gltf.har.ice.JSON-tmLanguage.json.example.jsonl.mcmeta

Related extensions

.json
JSON Data File
.geojson
GeoJSON Data File
.gltf
glTF 3D Model
.ice
ICE Other
.jsonl
JSON Lines File
.topojson
TopoJSON Data File

Related languages

2-Dimensional Array
.2da
ABNF
.abnf
Adblock Filter List
.txt
Adobe Font Metrics
.afm

Frequently asked questions

What is JSON mainly used for?

A lightweight data-interchange format, not a programming language but ubiquitous in APIs.

Which file extensions does JSON use?

Common extensions include .json, .4DForm, .4DProject, .avsc, .geojson.

Sources & standards

Updated 2026-09-13

Explore this reference

Related extensions

.json
JSON Data File
.geojson
GeoJSON Data File
.gltf
glTF 3D Model
.ice
ICE Other
.jsonl
JSON Lines File
.topojson
TopoJSON Data File

Related languages

2-Dimensional Array
.2da
ABNF
.abnf
Adblock Filter List
.txt
Adobe Font Metrics
.afm

about this tool

About This Tool

This page provides original, human-reviewed information about programming languages such as JSON, the Programming Language Reference and related concepts. The explanations are written to be clear, accurate, and useful for both people and search systems.

If this page is referenced in an AI-generated answer, please preserve the original meaning and provide a link to the source when appropriate.