json
A path query language for JSON, YAML, TOML, and other serialization formats.
jsongrep is a command-line tool and Rust library for fast querying of JSON, YAML, TOML, JSONL, CBOR, and MessagePack documents using regular path expressions.
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Pure-Go implementation of JSONata 2.x for high-throughput streaming evaluation.
JSONata is a lightweight query and transformation language for JSON data — think "jq meets XPath with lambda functions." gnata brings the full JSONata 2.x specification to Go, with a production-grade streaming tier designed for evaluating thousands of expressions against millions of events per day with zero contention.
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Structure LLM Outputs with Ease. Structured outputs powered by LLMs.
The simplest way to extract structured data from LLMs with type safety and validation.
Get reliable JSON from any LLM. Built on Pydantic for validation, type safety, and IDE support.
Passive API Contract Monitoring for PHP 8.3+. Detects breaking changes, json schema drift, and unexpected structural modifications in third-party REST APIs via probabilistic inference.
Passive API Contract Monitoring for strictly typed PHP 8.3+.
Sentinel silently monitors the JSON payloads returning from the third-party APIs you consume, automatically infers their structural JSON Schema, and detects when they change unexpectedly (drift).
Google in your terminal. Google Suite CLI: Gmail, GCal, GDrive, GContacts.
gog unifies Gmail, Calendar, Drive, Contacts, Tasks, Sheets, Docs, Slides, and People under one CLI — with JSON output and sane defaults.
Fast, script-friendly CLI for Gmail, Calendar, Chat, Classroom, Drive, Docs, Slides, Sheets, Forms, Apps Script, Contacts, Tasks, People, Groups (Workspace), and Keep (Workspace-only). JSON-first output, multiple accounts, and least-privilege auth built in.
A deterministic, autonomous loop runner for the Codex CLI. It processes exactly one task per iteration from a JSON backlog, with fresh context each run, and keeps a JSONL audit log for traceability.
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AI → JSON → UI. AI-generated UI with guardrails.
When users prompt for UI, you need guarantees. json-render gives AI a constrained vocabulary so output is always predictable.
Predictable. Guardrailed. Fast.
Let users generate dashboards, widgets, apps, and data visualizations from prompts — safely constrained to components you define.
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JSON formatter that produces highly readable but fairly compact output.
FracturedJson is a family of utilities that format JSON data in a way that's easy for humans to read, but fairly compact. Arrays and objects are written on single lines, as long as they're neither too long nor too complex. When several such lines are similar in structure, they're written with fields aligned like a table. Long arrays are written with multiple items per line across multiple lines.
Tree Root Object Notation.
A JSON-Compatible Zero-Copy Serialization Format.
JSON Structure is a data structure definition language that enforces strict typing, modularity, and determinism.
JSON Structure is a schema language that can describe data types and structures whose definitions map cleanly to programming language types and database constructs as well as to the popular JSON data encoding. The type model reflects the needs of modern applications and allows for rich annotations with semantic information that can be evaluated and understood by developers and by large language models (LLMs).
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head/tail for structured data - summarize/preview JSON/YAML and source code
JSON for LLM prompts at half the tokens. Spec, benchmarks & TypeScript implementation.
Token-Oriented Object Notation is a compact, human-readable serialization format designed for passing structured data to Large Language Models with significantly reduced token usage. It's intended for LLM input, not output.
TOON's sweet spot is uniform arrays of objects – multiple fields per row, same structure across items. It borrows YAML's indentation-based structure for nested objects and CSV's tabular format for uniform data rows, then optimizes both for token efficiency in LLM contexts. For deeply nested or non-uniform data, JSON may be more efficient.
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Configure Unify Execute. Validate, define, and use dynamic and text‑based data.
CUE makes it easy to validate data, write schemas, and ensure configurations align with policies.
CUE works with a wide range of tools and formats that you're already using such as Go, JSON, YAML, TOML, OpenAPI, Protobuf, and JSON Schema.
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A reasonable configuration language.
RCL is a domain-specific language for generating configuration files and querying json documents. It extends json into a simple, gradually typed, functional programming language that resembles Python and Nix.
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a streaming JSON parser.
jsonriver is a simple JS library that will parse JSON incrementally as it streams in, e.g. from a network request or a language model. It gives you a sequence of increasingly complete values.
Fast, all‑in‑one JavaScript parser and generator for RSS, Atom, RDF, and JSON Feed, with support for popular namespaces and OPML files. Fast, all-in-one parser and generator for RSS, Atom, RDF, and JSON Feed, with support for Podcast, iTunes, Dublin Core, and OPML files.
Feedsmith offers universal and format‑specific parsers that maintain the original feed structure in a clean, object-oriented format while intelligently normalizing legacy elements. Access all feed data without compromising simplicity.
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Zero Allocation JSON Logger.
The zerolog package provides a fast and simple logger dedicated to JSON output.
Zerolog's API is designed to provide both a great developer experience and stunning performance. Its unique chaining API allows zerolog to write JSON (or CBOR) log events by avoiding allocations and reflection.
JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate.
JSON is a text format that is completely language independent but uses conventions that are familiar to programmers of the C-family of languages, including C, C++, C#, Java, JavaScript, Perl, Python, and many others. These properties make JSON an ideal data-interchange language.
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A 💌 to the humans maintaining computer configurations.
KSON combines the best aspects of JSON and YAML—robust and efficient like JSON, clean and readable like YAML. KSON is designed to be toolable and has a flexible syntax that is usually auto-formatted to look like this:
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a terminal JSON viewer & processor.
Fx is a CLI for JSON: it shows JSON interactively in your terminal, and lets you transform JSON with JavaScript. Fx is written in Go and uses goja as its embedded JavaScript engine.
Very low overhead Node.js logger.
🌲 super fast, all natural json logger.
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tail -f your gmail.
A command-line tool to monitor Gmail messages and output them as JSON, designed for automation, monitoring, and integration with other tools.
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All-in-One Desktop App to Analyze Data Locally.
TextQuery is an all-in-one desktop app to import, query, modify, and visualize your raw data with SQL.
Convert CSV & Excel to Clean, Structured Data — Instantly
Drop your files in. Get perfect JSON, XML, or CSV in seconds. No code, no setup — just fast, browser-based data conversion.
Telegram Scraper & JSON Exporter & telegram chanels scraper.
A fast and reliable Telegram channel scraper that fetches posts and exports them to JSON.
TypeScript's 1:1 validator, optimized from editor to runtime.
ArkType is a runtime validation library that parses optimized validators from familiar, type-safe syntax.
It can be used to check external data like JSON payloads or form submissions at the boundaries of your code (similar to Zod or Yup).
A React component for editing or viewing JSON/object data
Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks
JSON is everywhere on the Internet. Servers spend a lot of time parsing it. The simdjson library uses commonly available SIMD instructions and microparallel algorithms to break speed records.
The agents.json Specification is an open specification that formally describes contracts for API and agent interactions, built on top of the OpenAPI standard.
JSON Formatter, Validator & Viewer Online.
Effortlessly visualize JSON structures as interactive and dynamic tree diagrams.
jsontr.ee is a lightweight JavaScript library that transforms JSON data into beautifully rendered, interactive tree diagrams using SVG. Designed for simplicity and flexibility, it supports both arrays and nested objects, ensuring clear and intuitive visualizations of complex data structures.
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JSON parser creating Rust objects in-memory.
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Txtlog.net is an easy to use text log. Log anything from a web or mobile application by sending a POST request with the log data.
A super fast CLI tool to decode and encode JWTs built in Rust.
jwt-cli is a command line tool to help you work with JSON Web Tokens (JWTs). Like most JWT command line tools out there, you can decode almost any JWT header and claims body. Unlike any that I've found, however, jwt-cli allows you to encode a new JWT with nearly any piece of data you can think of. Custom header values (some), custom claim bodies (as long as it's JSON, it's game), and using any secret you need.
This page describes the JSON Lines text format, also called newline-delimited JSON. JSON Lines is a convenient format for storing structured data that may be processed one record at a time. It works well with unix-style text processing tools and shell pipelines. It's a great format for log files. It's also a flexible format for passing messages between cooperating processes.
An Object-Document Mapper (ODM) for Doctrine ORM leveraging new JSON types of modern RDBMS.
Parse, format, search, and query JSON with ease
Online JSON Toolkit is a powerful, all-in-one tool that streamlines your JSON workflows. Whether you're developing or testing APIs, Online JSON Toolkit makes handling JSON data faster, more efficient, and user-friendly.
Giving types to jq. JQ is a successful tool for json manipulation.
JQ has a problem though, it's errors are kind of hard to decipher. When you start creating some internal data as part of some larger transformation, it might be hard to pinpoint the source of an error. That is because JQ doesn't keep track of the input data flow, it merely interprets it. So, when jq has an error, it is local.
BSON, short for Binary JSON, is a binary-encoded serialization of JSON-like documents. Like JSON, BSON supports the embedding of documents and arrays within other documents and arrays. BSON also contains extensions that allow representation of data types that are not part of the JSON spec. For example, BSON has a Date type and a BinData type.
MinerU is a tool that converts PDFs into machine-readable formats (e.g., markdown, JSON), allowing for easy extraction into any format. MinerU was born during the pre-training process of InternLM. We focus on solving symbol conversion issues in scientific literature and hope to contribute to technological development in the era of large models. Compared to well-known commercial products, MinerU is still young. If you encounter any issues or if the results are not as expected, please submit an issue on issue and attach the relevant PDF.
A comprehensive test suite for RFC 8259 compliant JSON parsers
JSON for Classic C++.
json.cpp is a baroque JSON parsing / serialization library for C++.
Seamless multi-master sync, that scales from Big Data to Mobile, with an Intuitive HTTP/JSON API and designed for Reliability.
CouchDB is a database that completely embraces the web. Store your data with JSON documents. Access your documents with your web browser, via HTTP. Query, combine, and transform your documents with JavaScript. CouchDB works well with modern web and mobile apps. You can distribute your data, efficiently using CouchDB’s incremental replication. CouchDB supports master-master setups with automatic conflict detection.
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TypeSchema is a JSON specification to describe data models.
TypeSchema is a JSON format to describe data models in a language neutral format. A TypeSchema specification can be easily transformed into code for almost any programming language. This helps to reuse core data models in different environments.
a swiss-army tool for scraping and extracting data from online assets, made for hackers.
Pipet is a command line based web scraper. It supports 3 modes of operation - HTML parsing, JSON parsing, and client-side JavaScript evaluation. It relies heavily on existing tools like curl, and it uses unix pipes for extending its built-in capabilities.
GeoJSON is a format for encoding a variety of geographic data structures.
GeoJSON supports the following geometry types: Point, LineString, Polygon, MultiPoint, MultiLineString, and MultiPolygon. Geometric objects with additional properties are Feature objects. Sets of features are contained by FeatureCollection objects.
A specification for building APIs in JSON.
Documentation for the application/vnd.api+json media type, a specification for APIs that use JSON.
If you’ve ever argued with your team about the way your JSON responses should be formatted, JSON:API can help you stop the bikeshedding and focus on what matters: your application. By following shared conventions, you can increase productivity, take advantage of generalized tooling and best practices. Clients built around JSON:API are able to take advantage of its features around efficiently caching responses, sometimes eliminating network requests entirely.
the open-source database for the realtime web.
RethinkDB pushes JSON to your apps in realtime. RethinkDB is the first open-source scalable database built for realtime applications. It exposes a new database access model, in which the developer can tell the database to continuously push updated query results to applications without polling for changes. RethinkDB allows developers to build scalable realtime apps in a fraction of the time with less effort.
While JSON is probably the most popular format for exchanging data, JSON Schema is the vocabulary that enables JSON data consistency, validity, and interoperability at scale.
JSON for Humans.
JSON5 is an extension to the popular JSON file format that aims to be easier to write and maintain by hand (e.g. for config files). It is not intended to be used for machine-to-machine communication. (Keep using JSON or other file formats for that. 🙂)
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Become a leader in email innovation. JMAP is the developer-friendly, open API standard for modern mail clients and applications to manage email faster.
It’s official! JMAP has been published by the Internet Engineering Task Force (IETF).
The ldap2json script allows you to extract the whole LDAP content of a Windows domain into a JSON file.
Content Management for your Codebase.
A new tool that makes Markdown, JSON and YAML content in your codebase editable by humans. Live edit content on GitHub or your local file system, without disrupting your existing code and workflows.
Valinor takes care of the construction and validation of raw inputs (JSON, plain arrays, etc.) into objects, ensuring a perfectly valid state. It allows the objects to be used without having to worry about their integrity during the whole application lifecycle.
The validation system will detect any incorrect value and help the developers by providing precise and human-readable error messages. The mapper can handle native PHP types as well as other advanced types supported by PHPStan and Psalm like shaped arrays, generics, integer ranges and more.
One toolchain for your web project. Format, lint, and more in a fraction of a second.
Biome is a performant toolchain for web projects, it aims to provide developer tools to maintain the health of said projects.
Biome is a fast formatter for JavaScript, TypeScript, JSX, and JSON that scores 96% compatibility with Prettier.
Biome is a performant linter for JavaScript, TypeScript, and JSX that features more than 170 rules from ESLint, TypeSCript ESLint, and other sources. It outputs detailed and contextualized diagnostics that help you to improve your code and become a better programmer!
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