# sveltejs/devalue

Gets the job done when JSON.stringify can't

Repository: https://github.com/sveltejs/devalue
Canonical: https://ross.abutalabs.com/products/devalue
Homepage: https://svelte.dev/repl/138d70def7a748ce9eda736ef1c71239
Language: JavaScript
License: MIT
License Family: permissive
Last push: 2026-08-20T16:45:57+00:00

## Health v2 (maintenance only)
Score: 98/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 98, longevity 100
- inputs: {"age_days": 3098, "days_push": 13, "days_rel": 13, "gap_med": 20.0, "n_releases_24m": 19}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2789, forks 93 (observed 2026-08-28T04:07:22.026936+00:00)

## What it is
A JavaScript serialization library that handles values JSON.stringify cannot, such as cyclical references, Map, Set, BigInt, Dates, RegExps, and Typed Arrays. It provides stringify/parse, uneval (code generation), and async stringification of promises.

## Use cases
- serialize objects with circular references
- serialize Map and Set to string
- pass rich data from server to client in SSR
- serialize BigInt and TypedArrays
- serialize data containing promises
- replace JSON.stringify for complex JavaScript values

## When to choose
- you need to serialize JavaScript values JSON can't handle
- you want compact, fast, XSS-safe serialization for hydration
- you need to embed serialized data in HTML or JS output

## When to avoid
- you need human-readable or stable cross-version output
- you need to serialize functions
- you only serialize plain JSON-compatible data

## Facets
- artifact type: library
- maturity: active
- function: serialization, parser
- domain: web-development, developer-tools
- platform: cross-platform
- tags: json, circular-references, data-transfer, ssr, javascript, nodejs

## Member repositories
- sveltejs/devalue (main) score 98

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:22.026936+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:49:18.096271+00:00, confidence not recorded.
  - readme: https://github.com/sveltejs/devalue (fetched 2026-08-28T04:07:22.026936+00:00, sha 90f21fbd55b5)
  - homepage: https://svelte.dev/repl/138d70def7a748ce9eda736ef1c71239 (fetched 2026-08-29T09:55:23.154572+00:00, sha c7af431dbf7e)
  - site_page: https://svelte.dev/docs (fetched 2026-08-29T09:55:23.163446+00:00, sha 7c6b305ccce5)
  - site_page: https://svelte.dev/docs/svelte (fetched 2026-08-29T09:55:23.165290+00:00, sha cfbcbf33b015)
  - site_page: https://svelte.dev/docs/kit (fetched 2026-08-29T09:55:23.167013+00:00, sha 4fc3a5122aaf)
  - site_page: https://svelte.dev/docs/cli (fetched 2026-08-29T09:55:23.168742+00:00, sha ec3bba855057)
  - site_page: https://svelte.dev/docs/ai (fetched 2026-08-29T09:55:23.170336+00:00, sha 448d79bc45ed)
  - registry_npm: https://registry.npmjs.org/devalue (fetched 2026-08-29T09:55:23.171926+00:00, sha 1b0ec572de95)
- Data as of 2026-08-30T08:39:29.467469+00:00.