superjson
JSON serializer supporting Dates, BigInts, Sets, Maps for type-safe data transfer.
Utilities npm MIT
Used in agent projects
53
0.4% of 12,697 public repos built with AI coding agents
Rank in utilities
#40 of 109
by use in those projects
Downloads
12M
npm, last 7 days, superjson
GitHub stars
5,283
last push Jun 18, 2026
How superjson is used
superjson is a dependency in 53 of the 12,697 public GitHub projects set up for AI coding agents that we scanned (0.4%), #40 of 109 in utilities. The most used alternative there is clsx. Projects that use it most often also use TanStack Query (94.3%), Zod (90.6%), tRPC (88.7%).
Often used with superjson
| TanStack Query | 94.3% of superjson projects · 9.8× more than average |
|---|---|
| Zod | 90.6% of superjson projects · 5.3× more than average |
| tRPC | 88.7% of superjson projects · 187.7× more than average |
| clsx | 71.7% of superjson projects · 4.0× more than average |
| Tailwind Merge | 69.8% of superjson projects · 4.1× more than average |
| Next.js | 79.2% of superjson projects · 3.5× more than average |
| Class Variance Authority | 62.3% of superjson projects · 4.4× more than average |
| Radix UI | 56.6% of superjson projects · 4.7× more than average |
By coding agent
| Cursor | 0.9% of projects set up for it |
|---|---|
| Claude Code | 0.6% of projects set up for it |
| GitHub Copilot | 0.6% of projects set up for it |
Share of public repos configured for each agent that list superjson as a dependency.
Install
| Package | npm install superjson |
|---|---|
| Main stacks | Next.js (40), TypeScript / JavaScript (10), Rust (2), React Native / Expo (1) |
| Example projects | kovrichard/catalyst, theskeletoncrew/treat-toolbox, amelioro/ameliorate, TokenRollAI/fast-mvp, Disdjj/profs |
Alternatives to superjson
| Tool | Used in agent projects | Downloads / wk | GitHub stars | License |
|---|---|---|---|---|
| clsx npm Tiny utility for conditionally constructing className strings. |
2,251 (17.7%) | 126M | 9,847 | MIT |
| date-fns npm Modern JavaScript date utility library with comprehensive formatting functions. |
1,079 (8.5%) | 97.6M | 36.6K | MIT |
| uuid npm Generate RFC9562 compliant UUIDs for unique identifiers in applications. |
454 (3.6%) | 296M | 15.3K | MIT |
| PyYAML pypi YAML parser and emitter for reading and writing YAML configuration files. |
385 (3.0%) | 239M | 2,954 | MIT |
| Lodash npm Modular utility library with methods for common programming tasks and data manipulation. |
269 (2.1%) | 162M | 61.4K | MIT |
| bn.js npm Big number library for handling arbitrary-precision integers in JavaScript. |
217 (1.7%) | 62.1M | 1,230 | MIT |
| python-dateutil pypi Extensions to Python's datetime module for advanced date and time manipulation. |
165 (1.3%) | 233M | 2,638 | Dual License |
| yaml npm JavaScript YAML parser and stringifier with full spec compliance. |
164 (1.3%) | 179M | 1,693 | ISC |