ky vs TanStack Query
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
Open source · MIT
A tiny HTTP client for JavaScript that wraps the Fetch API with simpler calls and error handling.
Open source · MIT
A library for fetching, caching, and updating data from servers in web apps.
The short answer
Choose ky if you need…
- JavaScript or TypeScript developers who already use fetch and want less boilerplate
- Projects that call a REST API and want JSON parsing and error handling in one call
- Developers who want a small package with no dependencies
- Teams that want typed responses or validation with Zod or Valibot via Standard Schema
Choose TanStack Query if you need…
- Frontend developers building apps that load data from a server
- Teams using React, Solid, Svelte, or Vue who want less hand-written loading and caching code
- Apps that need pagination, infinite scroll, or background refresh of data
Side-by-side
| ky | TanStack Query | |
|---|---|---|
| Type | Library | Library |
| Price | Free and open source | Free and open source |
| Licence | MIT | MIT |
| GitHub stars | 17.1k | 50.5k |
| Setup difficulty | Beginner | Intermediate |
| How you get it | Install with a package manager | Install with a package manager |
| Main language | TypeScript | TypeScript |
| Last code update | 28 days ago | 4 days ago |
What each one is
ky
Ky is a small JavaScript library for making HTTP requests, such as loading data from or sending data to a web server. It builds on the browser's built-in fetch function and adds conveniences like JSON handling, automatic retries, timeouts, and treating error status codes as errors. The README says it has no dependencies and works in modern browsers, Node.js, Bun, and Deno.
TanStack Query
TanStack Query is an open-source library for managing server data in web apps. It handles fetching data from an API, caching the results, keeping them in sync, and updating them after changes. The README says it works with REST, GraphQL, or any promise-based fetching, and it has versions for React, Solid, Svelte, and Vue.
Best for
ky
- JavaScript or TypeScript developers who already use fetch and want less boilerplate
- Projects that call a REST API and want JSON parsing and error handling in one call
- Developers who want a small package with no dependencies
- Teams that want typed responses or validation with Zod or Valibot via Standard Schema
TanStack Query
- Frontend developers building apps that load data from a server
- Teams using React, Solid, Svelte, or Vue who want less hand-written loading and caching code
- Apps that need pagination, infinite scroll, or background refresh of data
Strengths
ky
- Small package with no dependencies, according to the README
- Adds retries, timeouts, hooks, and error handling on top of plain fetch
- Typed responses: .json() defaults to unknown rather than any
TanStack Query
- Covers fetching, caching, refetching, and mutations in one library
- Works with multiple frameworks and any promise-based or GraphQL data source
- Large community: about 50,000 GitHub stars and an MIT license
Not ideal for
ky
- People who are not writing JavaScript or TypeScript code, since this is a code library
- Projects that need a feature the README does not mention, such as a built-in cookie jar, because the README does not cover that
- Anyone needing to support environments without fetch support, since Ky is built on the Fetch API
TanStack Query
- People who only need a simple static site with no server data (the library adds complexity without benefit)
- Non-developers looking for a ready-made app (this is a code library, not an end-user tool)
Trade-offs
ky
- Requires a runtime with fetch support, so it is not a fit for older environments
- The README describes the next version of Ky, so the docs may differ from the version most people install
- Some features, such as streaming request bodies, depend on browser support the README describes as limited
TanStack Query
- Requires learning its concepts (queries, mutations, cache keys) before it is productive
- The README is truncated here, so detailed setup and API behavior are not covered in this entry
Getting started
TanStack Query
Clone the repository
git clone https://github.com/TanStack/queryFrequently asked questions
What is the difference between ky and TanStack Query?
ky: A tiny HTTP client for JavaScript that wraps the Fetch API with simpler calls and error handling. TanStack Query: A library for fetching, caching, and updating data from servers in web apps. ky suits javascript or typescript developers who already use fetch and want less boilerplate, while TanStack Query suits frontend developers building apps that load data from a server.
Are ky and TanStack Query free?
ky: Free and open source. TanStack Query: Free and open source.
Which is easier to set up, ky or TanStack Query?
ky is easier to get started with (rated beginner); TanStack Query is rated intermediate and usually needs more setup.
Is ky or TanStack Query more popular?
TanStack Query has more GitHub stars (50.5k) than ky (17.1k). Popularity isn't the same as fit — check which one matches your use case above.
What are other alternatives to ky and TanStack Query?
Other options people compare them with include axios, got, SwiftyJSON, mitt, Alamofire.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.