JSON Formatter and Validator jsonformatter.curiousconcept.com

Formatter to help with debugging.

JSON Editor online jsoneditoronline.org

A web-based tool to view, edit and format.

JSON Crack jsoncrack.com

Display your JSON as a graph

JSONCompare jsoncompare.com

The Advanced Version of the JSON Linter.

JSON Blob jsonblob.com

An online tool to view, edit, format, and share data. Also has an API for making requests against stored blobs.

JSON BinPack jsonbinpack.org

Space-efficient binary JSON serialization format based on JSON Schema.

JSONata jsonata.org

Query and transformation language used in Node-RED, supports function expressions.

JSON5 json5.org

a extension that aims to make it easier for humans to write and maintain by hand.

json2yaml json2yaml.com

Convert JSON to YAML online.

json2html json2html.com

HTML templating library with wrappers for both jQuery and Node.js. (Javascript)

Introducing JSON json.org

JSON.fr json.fr

Fully client-side validator and formatter.

JSON 1.1/JSONX json-next.github.io

An evolved version 1.1 with format extension for humans incl. comments, unquoted and multi-line strings, optional and trailing commas and more.

JSON Guard json-guard.thephpleague.com

A validator for JSON Schema Draft 4.

JSON Generator json-generator.com

Tool for generating random data.

jq play jqplay.org

A playground for jq.

JMESPath jmespath.org

A query language for JSON.

JSON Meta Application Protocol (JMAP) jmap.io

A protocol for synchronising JSON-based data objects efficiently, with support for push and out-of-band binary data upload/download.

jarg jdp.github.io

Shorthand JSON and form encoding syntax in the shell.

FracturedJson j-brooke.github.io

Formatter that produces human-readable but fairly compact output.

ipinfo.io ipinfo.io

JSON IP and GeoIP REST API.

What is JSON and how to use it ilovecoding.org

Video tutorial for beginners.

Heartstone JSON hearthstonejson.com

Up to date Hearthstone card data.

json-schema hackage.haskell.org

JSON Schema library for Haskell

hjsonschema hackage.haskell.org

JSON Schema Draft 4 library for Haskell

JSONPath goessner.net

XPath implementation. (Javascript/PHP)

JSONKit github.com

Swiss Army knife: format, validate, query via dot-notation, diff, flatten, convert to CSV, and stats. Zero dependencies, Python 3.10+.

HOCON github.com

Human-Optimized Config Object Notation.

FrontAid CMS frontaid.io

Content Management System that supports arbitrary data model structures.

FakeJSON fakejson.com

Web API to quickly generate fake data for your application.

Extends Class extendsclass.com

Diff tool to compare two files.

Exchange Rate API exchangerate-api.com

A simple and free API for currency exchange rate data.

JSONP en.wikipedia.org

Safer cross-domain Ajax with JSON-P/JSONP.

DefiantJS defiantjs.com

Lightning-fast searches using XPath expressions, and transform using XSL. (Javascript)

CBOR datatracker.ietf.org

Concise Binary Object Representation.

DataFormatter Pro dataformatterpro.com

Browser-based formatter, validator, diff, and converter with a tree view.

Dadroit V Web dadroit.com

In-browser viewer for large files with tree view, RegEx search, and URL loading with auth. Fully client-side.

Dadroit JSON Viewer dadroit.com

Very fast JSON Viewer, supporting huge (multi gigabytes) files, JSON log (JSON-Lines and ndjson).

country.io country.io

Various country related datasets, as JSON inc currency, country codes, names and more

CouchDB couchdb.apache.org

Seamless multi-master sync, that scales from Big Data to Mobile, with an Intuitive HTTP/JSON API and designed for Reliability.

/contribute.json contributejson.org

Making open source contribution information easier to access, across projects.

Itemscript code.google.com

Language for validating and specifying values.

codables codableslib.com

Declarative, type-rich (de)serializer able to handle almost any data type.

JSON Viewer chromewebstore.google.com

(github) - It is a Chrome extension for printing JSON and JSONP.

JSON Viewer Pro chromewebstore.google.com

(github - An open source Chrome extension for browsing JSON with syntax highlighting and folding, or as a visual graph.

Discoverable JSON chromewebstore.google.com

(github) - Gron inspired Extension. Convert a JSON document into javascript expressions. Comes with filter, remove, find-and-replace capabilities.

JSON Formatter chromewebstore.google.com

(github) - Makes JSON easy to read. Open source.

JSON Finder chromewebstore.google.com

(github) - Browse like you do it in Finder.

Collapsible JSON Formatter bodurov.com

Formatter and Colorer of Raw Code.

JSON 3 bestiejs.github.io

A modern implementation.