class-transformer
Decorator-based transformation and serialization of plain objects to classes.
Forms, validation and schemas npm MIT
Used in agent projects
27
0.2% of 12,697 public repos built with AI coding agents
Rank in forms, validation and schemas
#18 of 22
by use in those projects
Downloads
12.9M
npm, last 7 days, class-transformer
GitHub stars
7,337
last push May 22, 2026
How class-transformer is used
class-transformer is a dependency in 27 of the 12,697 public GitHub projects set up for AI coding agents that we scanned (0.2%), #18 of 22 in forms, validation and schemas. The most used alternative there is Zod. Projects that use it most often also use class-validator (92.6%), NestJS (85.2%), RxJS (81.5%).
Often used with class-transformer
| class-validator | 92.6% of class-transformer projects · 419.9× more than average |
|---|---|
| NestJS | 85.2% of class-transformer projects · 216.3× more than average |
| RxJS | 81.5% of class-transformer projects · 58.8× more than average |
| ts-node | 81.5% of class-transformer projects · 12.0× more than average |
| Prettier | 77.8% of class-transformer projects · 4.5× more than average |
| Jest | 70.4% of class-transformer projects · 12.7× more than average |
| SuperTest | 63.0% of class-transformer projects · 58.4× more than average |
| tsconfig-paths | 59.3% of class-transformer projects · 87.5× more than average |
By coding agent
| Claude Code | 0.4% of projects set up for it |
|---|---|
| Cursor | 0.4% of projects set up for it |
| GitHub Copilot | 0.3% of projects set up for it |
Share of public repos configured for each agent that list class-transformer as a dependency.
Install
| Package | npm install class-transformer |
|---|---|
| Main stacks | TypeScript / JavaScript (26), Next.js (1) |
| Example projects | Azure/azure-sdk-tools, alkem-io/server, Hive-Academy/ptah-extension |
Alternatives to class-transformer
| Tool | Used in agent projects | Downloads / wk | GitHub stars | License |
|---|---|---|---|---|
| Zod npm TypeScript-first schema validation library with static type inference. |
2,153 (17.0%) | 326M | 44.1K | MIT |
| React Hook Form npm Performant form state library using React Hooks with minimal rerenders. |
1,021 (8.0%) | 54.7M | 44.9K | MIT |
| React Hook Form Resolvers npm Validation resolvers for React Hook Form supporting Zod, Yup, and others. |
885 (7.0%) | 45.1M | 2,264 | MIT |
| Pydantic pypi Data validation and parsing library using Python type hints. |
649 (5.1%) | 222M | 29K | — |
| Ajv npm Fast JSON Schema validator for runtime schema validation and serialization. |
131 (1.0%) | 391M | 14.9K | MIT |
| jsonschema pypi Python implementation of JSON Schema validation for structured data. |
129 (1.0%) | 125M | 4,989 | — |
| Protocol Buffers pypi Serialization format and code generator for structured data. |
75 (0.6%) | 154M | — | 3-Clause BSD License |
| drizzle-zod npm Generate Zod validation schemas automatically from Drizzle ORM database schemas. |
68 (0.5%) | 3.2M | 36K | Apache-2.0 |