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November 26, 2020 19:37
April 13, 2021 07:25

Awesome JSON Awesome

A curated list of awesome JSON libraries and resources.

Inspired by the awesome list.



  • Visual JSON (github) - simple JSON pretty-viewer for Mac OS X.
  • JSONExport - convert a object to a class of one of the currently supported languages.

Binary Serialization

  • BSON - Binary JSON.
  • MessagePack - An extremely efficient object serialization library.
  • UBJSON - The universally compatible format specification for binary JSON.
  • CBOR - Concise Binary Object Representation.
  • PSON - Protocol JSON, super efficient binary serialization format.
  • JSON BinPack - Space-efficient binary JSON serialization format based on JSON Schema.

Browser Extensions




  • JSONAce (github) - Formats & syntax highlights JSON viewed inside of the web browser using the ACE editor.
  • JSONView (github) - A port of the JSONView Firefox extension that formats and syntax highlights JSON viewed inside of the browser

Command-line tools

  • dsq - Tool for running SQL queries against JSON, CSV, Excel, Parquet, and more.
  • fx - A interactive terminal tool.
  • jo - A small utility to create JSON objects
  • jsoncat - Pretty-print Json in terminal with colors and adjusting tabs size.
  • jq - A lightweight and flexible command-line JSON processor.
  • json - A "json" command for massaging JSON on your Unix command line.
  • jshon - A parser designed for maximum convenience within the shell.
  • jarg - Shorthand JSON and form encoding syntax in the shell.
  • jsawk - Like awk, but for JSON.
  • json-dotenv - Manipulate and extract envfiles in json format.
  • gron - Convert a JSON file into discrete assignments that are greppable.
  • jid - Incremental Digger. Drill down JSON interactively by using filtering queries like jq.
  • jiq - It's jid with jq. You can drill down interactively by using jq filtering queries.
  • jv - jv (for jsonviewer) helps you view your JSON.
  • jl - Functional sed for JSON.
  • oj - A fast and flexible command line JSON processor.
  • visidata - A terminal spreadsheet-like tool for interactively exploring data.


  • MongoDB - an open-source document database, and the leading NoSQL database.
  • RethinkDB - An open-source distributed document database with a pleasant and powerful query language.
  • EJDB - Embedded JSON Database engine published under MIT license. (C)
  • lowdb - Flat file database built on lodash API. (Javascript)
  • Lawnchair - A lightweight clientside document store. (Javascript)
  • JSON ODM - Object document mapper for JavaScript to use on the server or in the browser. (Javascript)
  • JSON Server - Get a full fake REST API with zero coding in less than 30 seconds.
  • Kinto - A lightweight JSON storage service with synchronisation and sharing abilities.
  • CouchDB - Seamless multi-master sync, that scales from Big Data to Mobile, with an Intuitive HTTP/JSON API and designed for Reliability.
  • RxDB - Event-driven JSON-Database with JSON-Schema, mango-Query and CouchDB-sync. (Javascript)
  • JSONlite - A simple, self-contained, serverless, zero-configuration, json document store. (Bash)


  • - Various country related datasets, as JSON inc currency, country codes, names and more
  • countries - World countries.
  • vat-rates - VAT rates for all EU countries.
  • MTG JSON - Up to date Magic the Gathering card data.
  • Heartstone JSON - Up to date Hearthstone card data.
  • getCountries() - Generator for custom Countries data.

Data modeling

  • JSONModel - Magical Data Modelling Framework. (Objective-C)

Data generation

  • jsonymize - Reads data from standard input, anonymizes, then writes to standard output.
  • dyson - Server for dynamic, fake JSON. (node.js)


  • JSONPatch - A format for describing changes to a document.
  • JSON-Patch - Lean and mean Javascript implementation of the JSON-Patch standard (RFC 6902). (Javascript)
  • jiff - JSON Patch and diff based on rfc6902. (Javascript)
  • json-patch-php - implementation of JSON-patch (IETF RFC 6902) (PHP)
  • dffptch - A micro library for diffing and patching using a compact diff format. (Javascript)
  • jsondiffpatch - Diff & patch for JavaScript objects. (Javascript)


  • FrontAid CMS - Content Management System that supports arbitrary data model structures.
  • JSONEdit - User friendly, visual editor built as an AngularJS directive.

Format Extensions

  • GeoJSON - A geospatial data interchange format.
  • JSON-LD - A lightweight Linked Data format.
  • JSON-RPC - A stateless, light-weight remote procedure call (RPC) protocol.
  • JSONP - Safer cross-domain Ajax with JSON-P/JSONP.
  • JsonML - A compact format for transporting XML-based markup as JSON which allows it to be losslessly converted back to its original form.
  • JSON5 - a extension that aims to make it easier for humans to write and maintain by hand.
  • JSON6 - JSON for Humans (ES6).
  • JSON 1.1/JSONX - An evolved version 1.1 with format extension for humans incl. comments, unquoted and multi-line strings, optional and trailing commas and more.
  • JSON Resume - The open source initiative to create standard for resumes.
  • JSON Web Tokens - A compact URL-safe means of representing claims to be transferred between two parties.
  • JSON API - A standard for building APIs.
  • Collection+JSON - A read/write hypermedia-type designed to support management and querying of simple collections.
  • hal-json - A set of conventions for expressing hyperlinks in either JSON or XML.
  • JSON Activity Streams - A format for syndicating social activities around the web.
  • JSON-stat - Simple lightweight format for data dissemination.
  • /contribute.json - Making open source contribution information easier to access, across projects.
  • JSON Table Schema - a simple schema for tabular data
  • NDJSON (Newline delimited JSON) - a standard for delimiting JSON in stream protocols.
  • survey.js - JSON based survey library.
  • JSON Meta Application Protocol (JMAP) - A protocol for synchronising JSON-based data objects efficiently, with support for push and out-of-band binary data upload/download.
  • JackSON: JSON secret keeper - JSONic way of storing secrets in config file.

Frontend components

  • JSON editor jQuery plugin - component for you web apps/pages. (jQuery)
  • jqTree - Widget for displaying a tree structure in html. (jQuery)
  • jsTree - jquery plugin, that provides interactive trees. (jQuery)
  • Dynatable.js - A funner, semantic, HTML5+JSON, interactive table plugin. (jQuery)
  • JSON Formatter - Angular directive for collapsible JSON in HTML. (AngularJS)
  • react-jsonschema-form - A React component for building Web forms from JSON Schema. (React)
  • ngx-formly - JSON powered / Dynamic forms for Angular



  • Jansson - A C library for encoding, decoding and manipulating data.
  • jsmn - A minimalistic parser in C. It can be easily integrated into the resource-limited projects or embedded systems.
  • json-build - A minimalistic serializer in C. It can be easily integrated into the resource-limited projects or embedded systems.
  • ojc - A fast JSON parser.


  • ArduinoJson - An efficient library for embedded systems.
  • JSON++ - A self contained Flex/Bison parser for C++11.
  • json11 - A tiny library for C++11.
  • Nlohmann JSON - A C++11 header-only class.
  • RapidJSON - A fast JSON parser/generator for C++ with both SAX/DOM style API
  • simdjson - Parsing gigabytes of JSON per second.


  • data.json - parser/generator to/from Clojure data structures.


  • JSON-Fortran - A Fortran library for writing, reading, and manipulating JSON files and data structures.


  • ojg - A collection of high performance JSON processing and generating tool.



  • JSON-java - A reference implementation.
  • Fast JSON Processor
  • Gson - A Java library to convert JSON to Java objects and vice-versa.
  • Jackson - A multi-purpose Java library for processing JSON data format.
  • moshi - A modern JSON library for Android and Java.
  • essential-json - A lightweight Java library for serialization, parsing and manipulation with a clean and precise API.
  • dsl-json - A very fast streaming JSON library. Operates on byte arrays.
  • mjson - Lean JSON Library for Java, with a compact, elegant API.


  • JSON-js - JSON in JavaScript.
  • JSON 3 - A modern implementation.
  • oboe.js - A streaming approach, speeds up web applications by providing parsed objects before the response completes.
  • FracturedJsonJs - A JSON formatter that produces human-readable but fairly compact output.


  • JSONKit - Objective-C library.
  • SBJson - Parse one or more chunks of data.


  • JSON::Tiny - Perl module for encoding and decoding JSON in a minimalistic way.


  • PL/JSON - A generic JSON object written in PL/SQL.


  • Webmozart JSON - A robust decoder/encoder with support for schema validation.


  • simplejson - A simple, fast, extensible encoder/decoder
  • jsonpickle - Library for serializing any arbitrary object graph.
  • metamagic.json - An ultra-fast Python 3 implementation of a JSON encoder.


  • oj - A fast JSON parser and Object marshaller as a Ruby gem.
  • MultiJSON - A generic swappable back-end for JSON handling.


  • json2react - Use JSON to create React Stateless Components.



  • spray-json - A lightweight, clean and simple implementation in Scala.
  • circe - Yet another JSON library for Scala.
  • scala-jsonapi - Support library for integrating the JSON:API spec with Play, Spray and/or Circe backends.
  • jsoniter-scala - Scala macros for compile-time generation of ultra-fast JSON codecs.


  • jshn - JSON parsing and generation library in for shell scripts (Ash/Bash)


  • SwiftyJSON - The better way to deal with data in Swift.


  • jsonlint - Parser and validator with a CLI. (Javascript)
  • JSON Lint - PHP linter. (PHP)

Online tools

Schema Specifications

  • JSON Schema - a JSON based format for defining the structure of JSON data.
  • Itemscript - Language for validating and specifying values.
  • Kwalify - A parser, schema validator, and data binding tool
  • Rx - Simple, Extensible Schemata.


  • Exchange Rate API - A simple and free API for currency exchange rate data.
  • - JSON IP and GeoIP REST API.
  • JSONProxy - Simple HTTP proxy that enables cross-domain requests to any JSON API.
  • Myjson - A simple store for your web or mobile app.
  • Telize - JSON IP and GeoIP REST API.
  • jsonpad - a simple JSON storage platform.


  • YAML - A human friendly data serialization standard for all programming languages.
  • HanSON - JSON for Humans - with unquoted identifiers, multi-line strings and comments.
  • μson (uson) - a shorthand for JSON.
  • HOCON - Human-Optimized Config Object Notation.
  • ASON - A semantically complete superset of JSON (draft).
  • TOML - A minimal configuration file format that's easy to read due to obvious semantics.
  • HCL - A structured configuration language that is both human and machine friendly.


Related formats

  • AXON - A simple text based format for interchanging of objects, documents and data. It tries to combine the best of JSON, XML and YAML.
  • CSON - CoffeeScript-Object-Notation. JSON for CoffeeScript objects.
  • MSON - Markdown syntax compatible with describing JSON and JSON Schema.
  • ArchieML - Structured text format optimized for human writability.


  • Type-o-rama - JS type systems interportability, comparison of different JS type systems and conversion between them.
  • Awesome jq - A curated list of awesome jq tools and resources.


  • Jsonnet - A domain specific configuration language that helps you define JSON data.
  • rabl - General ruby templating with json, bson, xml, plist and msgpack support. (Ruby)
  • json2html - HTML templating library with wrappers for both jQuery and Node.js. (Javascript)


  • JSON Test - Testing platform for services utilizing JavaScript Object Notation (JSON).
  • JSONassert - Write JSON unit tests in less code. Great for testing REST interfaces. (Java)
  • JsonUnit - A library that simplifies JSON comparison in unit tests. It's strongly inspired by XmlUnit.
  • JSON Parsing Test Suite - A very complete test suite and validation framework.

Text Editor Plugins



  • vim-json - A better JSON for Vim: distinct highlighting of keywords vs values, JSON-specific (non-JS) warnings, quote concealing. Pathogen-friendly.

Visual Studio Code

  • FracturedJsonVsc - Formatter that produces human-readable but fairly compact output.


  • nvim-jqx - Browse and query json files in neovim from the quickfix window. (Lua)


  • json-sharp - Javascript tool to process operations on pure JSON objects. (Javascript)
  • json2json - Transform (reformat) structures from one to another. (Javascript)
  • trans - The ultimate object transformer. (Javascript)
  • osmtogeojson - Converts OSM data to GeoJSON. (Javascript)
  • fast-xml-parser - Fast XML to JSON and vice versa javascript/JSON conversion.
  • x2js - XML to JSON and vice versa javascript conversion functions. (Javascript)
  • JSONC - JSON compressor and decompressor. (Javascript)
  • JsonMapper - Map nested structures onto PHP classes (PHP)
  • SassyJSON - Sass-powered API. (Sass)
  • json.human.js - A small library to convert a JSON object into a human readable HTML representation that is easy to style for different purposes.
  • JSONtoFoundation - OS X utility that converts a JSON object to a Foundation object that can be used in Cocoa/Cocoa Touch development. (Swift)
  • fanci - Extract, rename and transform JSON based on a template. (node.js)
  • Pinch - String.replace for JavaScript objects. (Javascript)
  • deepjson - A better way to load big json config files. (node.js)
  • jsontl - allow transformation using a JSON-based transformation language. (node.js)
  • json-transforms - A recursive, pattern-matching, approach to transforming JSON structures.
  • normalizr - Normalizes nested JSON according to a schema. (Javascript)
  • JSON-populate - Tool for populating JSON data with infinitely recursive circular references. Sort of like Falcor, but for plain JSON.
  • CircularJSON - JSON does not handle circular references. Now it does.
  • Sawmill - JSON transformation library (Java)
  • nimnjs - JSON to nimn bidirectional converter.
  • stylops - CSS subset to JSON conversion. (node.js)


  • dasel - Query and update data structures using selectors from the command line. Comparable to jq / yq but supports JSON, YAML, TOML and XML with zero runtime dependencies.
  • JMESPath - A query language for JSON.
  • JSON Mask - Tiny language and engine for selecting specific parts of a JS object, hiding the rest. (Javascript)
  • JSONiq - The JSON Query Language.
  • ObjectPath - The agile query language for semi-structured data. (Python)
  • DefiantJS - Lightning-fast searches using XPath expressions, and transform using XSL. (Javascript)
  • JSONSelect - CSS-like selectors. (Javascript)
  • JSONPath - XPath implementation. (Javascript/PHP)
  • searchjs - A library for filtering based on a json SQL-like language.
  • json-rel - Transparent references in JSON.
  • JSONata - Query and transformation language used in Node-RED, supports function expressions.

JSON Schema Frontend components

  • JSON Editor - JSON Schema Based Editor. (jQuery)
  • angular-schema-form - Generate forms. (AngularJS)
  • JSON Schema View - An AngularJS directive for rendering JSON Schema in HTML (AngularJS)
  • Angular JSON Schema Form - Angular directive for making forms out of JSON Schema. (AngularJS)
  • AlpacaJS - Generates JSON Schema driven forms on top of Bootstrap, jQuery Mobile, jQuery UI and HTML (jQuery)

JSON Schema Tools

  • prmd - Tools and doc generation for HTTP APIs.
  • generate-schema - Effortlessly convert your JSON Object to JSON Schema, Mongoose Schema, or a Generic template for quick documentation / upstart.
  • Docson - Documentation for your types.
  • Orderly JSON - A textual format for describing JSON compiled into JSONSchema.
  • jsonschema2pojo - Generates Java types and annotates those types for data-binding with Jackson 1.x or 2.x, Gson, etc.
  • Matic - Build tool for generating HTML documentation.
  • JSON Schema + Faker - Fake your schemas.
  • DLL.js - Gets you a JSON Schema from PostgreSQL or SQLite3.
  • - JSON Schema generator from JSON object.
  • js-schema - A new way of describing object schemas in JavaScript. It has a clean and simple syntax, and it is capable of serializing to/from the popular JSON Schema format.
  • aptos - A tool for validating data using JSON Schema and converting JSON Schema documents into different data-interchange formats.
  • JSON Schema $Ref Parser - Parse, resolve, and dereference JSON Schema $ref pointers

JSON Schema Resources

  • Understanding JSON Schema - A website aiming to provide more accessible documentation for JSON schema.
  • JSON Schema Store - A collection of popular schemas.
  • Using JSON Schema - a Book and GitHub project, showing how JSON Schema can be used for a variety of tasks and in different programming contexts.
  • Awesome JSON Schema - A curated list of awesome JSON Schema resources, tutorials, tools, and more.

JSON Schema Validators

Javascript and Node.js

  • json-schema-benchmark - Performance benchmark for Node.js validators.
  • is-my-json-valid - A validator that uses code generation to be extremely fast.
  • jsen - A validator built for speed.
  • themis - A blazing fast validator.
  • jsck - JSON Schema Compiled checK.
  • z-schema - validator written in JavaScript for NodeJS and Browsers.
  • jjv - Javascript Library for Schema Validation.
  • request-validator - Flexible request validator middleware for express and connect.
  • tv4 - Tiny Validator.
  • ajv - The fastest validator. Supports v5/6 proposals.

Java and Kotlin

  • Medeia Validator - Compliant (draft-04/06/07) and fast streaming validator written in Kotlin



  • jsonschema - Python implementation of jsonschema.
  • JSON Schema Toolkit - Programmatic building of JSON schemas (recursive field mappings) with validation, a Django JSON Field, and native PostgreSQL JSON type constraints.



Contributions welcome! Read the contribution guidelines first.




A curated list of awesome JSON libraries and resources.








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