Directory

Open Source Packages

Libraries, frameworks, tools, and SDKs used by the apps in this directory — scored the same way as the apps themselves.

5929 packages

All Packages

91Health
Tool npm

prettier

An opinionated code formatter that enforces consistent style across every language your project speaks.

52,316
MIT
Used by 310
72Health
Library Cargo

serde_json

The de facto standard JSON library for Rust, built on the Serde serialization framework

5,638
Apache 2.0
Used by 113
64Health
Library npm

fs-extra

Drop-in replacement for Node's fs module adding copy, remove, mkdirs, and JSON helpers with native promise support.

9,590
MIT
Used by 84
91Health
Framework PyPI

FastAPI

A modern, high-performance Python web framework for building APIs with automatic validation, serialization, and interactive docs.

102,676
MIT
Used by 78
63Health
Library npm

diff

A battle-tested JavaScript library for computing and applying text diffs at the character, word, line, sentence, CSS, or JSON level.

9,210
BSD 3
Used by 70
85Health
Library npm

Pino

A super fast, low-overhead JSON logger for Node.js applications.

18,227
MIT
Used by 67
79Health
Library npm

Drizzle ORM

A lightweight, zero-dependency TypeScript ORM with full SQL-like query flexibility

35,907
Apache 2.0
Used by 57
60Health
Library npm

Winston

A battle-tested Node.js logging library with pluggable transports, custom formats, and multiple log levels.

24,519
MIT
Used by 50
86Health
Library PyPI

PyJWT

A Python implementation of RFC 7519 for encoding, decoding, and verifying JSON Web Tokens.

5,706
MIT
Used by 44
93Health
Library PyPI

SQLAlchemy

The Python SQL toolkit and Object Relational Mapper that gives developers the full power and flexibility of SQL.

12,189
MIT
Used by 43
80Health
Library npm

better-sqlite3

The fastest and simplest SQLite3 library for Node.js, with a synchronous API and full transaction support.

7,497
MIT
Used by 40
90Health
SDK npm

@clickhouse/client

The official TypeScript client for connecting Node.js applications to ClickHouse over HTTP.

332
Apache 2.0
Used by 38
82Health
Library npm

body-parser

Node.js body-parsing middleware that turns raw HTTP request bodies into ready-to-use req.body objects.

5,499
MIT
Used by 36
82Health
Library Go

Go-MySQL-Driver

A pure Go implementation of the MySQL wire protocol, used as the database/sql driver for MySQL, MariaDB, and TiDB.

15,285
MPL-2.0
Used by 33
82Health
Library npm

type-fest

A collection of essential, ready-made TypeScript utility types beyond the built-in standard library.

17,417
Other
Used by 32
51Health
Library npm

superjson

Serialize JavaScript to a superset of JSON that keeps Dates, Maps, Sets, BigInts, and more intact.

5,281
MIT
Used by 32
81Health
Library npm

fast-xml-parser

Pure-JS XML parser, builder, and validator with no C/C++ bindings and no callbacks

3,139
MIT
Used by 32
64Health
Library npm

postgres

Postgres.js is a zero-dependency PostgreSQL client for Node.js, Deno, Bun, and Cloudflare Workers built on ES6 tagged template literals.

8,733
Other
Used by 31
45Health
Library npm

zod-to-json-schema

Converts Zod validation schemas into standard JSON Schema, ready for OpenAPI, OpenAI, and JSON Schema draft 7 consumers.

1,254
Other
Used by 30
56Health
Library npm

knex

A flexible, portable SQL query builder for Node.js supporting PostgreSQL, MySQL, CockroachDB, SQL Server, SQLite3, and Oracle.

20,347
MIT
Used by 29
45Health
Library npm

JSON5

JSON for humans: an extended JSON syntax with comments, trailing commas, and unquoted keys for hand-written config.

7,168
MIT
Used by 28
90Health
Library PyPI

jsonschema

The reference implementation of JSON Schema validation for Python, supporting every draft from 3 to 2020-12.

4,986
MIT
Used by 27
89Health
Tool PyPI

Alembic

Database migrations tool for SQLAlchemy with autogenerate and transactional DDL

4,413
MIT
Used by 27
91Health
Framework npm

Fastify

A fast and low-overhead web framework for Node.js, built around schema-based validation and a plugin architecture

37,205
MIT
Used by 25

Join founders buildingwith open source

Opinionated takes, migration guides, cost-saving tips, and insights from the open source ecosystem.

Subscribe on Substack
Join 750+ subscribers