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\n\n\n\n# object-identity [![licenses](https://licenses.dev/b/npm/object-identity?style=dark)](https://licenses.dev/npm/object-identity)\n\n\n\n**A tiny, fast utility that canonicalizes any value into a stable identity, for structurally\nequality.**\n\n
\n
\n\n^{\n\nThis is free to use software, but if you do like it, consider supporting me ❤️\n\n[![sponsor me](https://badgen.net/badge/icon/sponsor?icon=github&label&color=gray)](https://github.com/sponsors/maraisr)\n[![buy me a coffee](https://badgen.net/badge/icon/buymeacoffee?icon=buymeacoffee&label&color=gray)](https://www.buymeacoffee.com/marais)\n\n}\n\n

\n\n## ⚡ Features\n\n- 🧬 **Canonical.** The same shape always produces the same id.\n- 🌀 **Deep and cycle-safe.** Handles nested objects, arrays, sets, maps, and circular references.\n- 🏎 **Fast.** See the [benchmarks](#-benchmark).\n- 🪶 **Tiny.** Around 543B minified and gzipped, with zero\n [dependencies](https://npm.anvaka.com/#/view/2d/object-identity/).\n\n## ⚙️ Install\n\n- **npm** — available as [`object-identity`](https://www.npmjs.com/package/object-identity)\n- **JSR** — available as [`@mr/object-identity`](https://jsr.io/@mr/object-identity)\n\n## 🚀 Usage\n\n```ts\nimport { identify } from 'object-identity';\n\n// same shape, different key order, same id\nidentify({ a: 1, b: 2 }) === identify({ b: 2, a: 1 }); // true\n\n// a plain object and an equivalent Map produce the same id\nidentify({ a: 'b' }) === identify(new Map([['a', 'b']])); // true\n\n// nesting, Sets, Dates, and RegExps are all supported\nconst key = identify({ user: 7, filters: new Set(['active', 'new']) });\n```\n\n## 💨 Benchmark\n\n- **simple** a complete nested object, with an arrays and other mixed primitives.\n- **deep** a long, narrow nesting chain.\n- **deep circular** the deep chain, but every node points back and the tail closes the loop.\n- **big** a wide object: hundreds of keys, but with small values.\n- **leafy** a large flat array of mixed primitives.\n\n\n\n```\n✔ simple 829,712 ops/sec\n✔ deep 117,578 ops/sec\n✔ deep circular 169,652 ops/sec\n✔ big 11,664 ops/sec\n✔ leafy 41,925 ops/sec\n```\n\n

All candidates

\n\n```diff\nsimple\n+ ✔ object-identity 829,712 ops/sec\n ✔ safe-stable-stringify 544,561 ops/sec 1.52x\n ✔ ohash 257,343 ops/sec 3.22x\n ✔ object-hash 96,890 ops/sec 8.56x\n ✔ hash-it † 328,222 ops/sec 2.53x\n ✔ json-stable-stringify 309,313 ops/sec 2.68x\n ✔ fast-json-stable-stringify 458,943 ops/sec 1.81x\n ✔ tiny-stable-stringify 402,523 ops/sec 2.06x\n ✔ json-stringify-deterministic 311,265 ops/sec 2.67x\n ✔ json-sorted-stringify 402,961 ops/sec 2.06x\n ✔ canonicalize 267,754 ops/sec 3.10x\n ✔ swr/_internal/stableHash 250,439 ops/sec 3.31x\n ✘ @tufjs/canonical-json\n\ndeep\n+ ✔ object-identity 117,578 ops/sec\n ✔ safe-stable-stringify 74,688 ops/sec 1.57x\n ✔ ohash 38,360 ops/sec 3.07x\n ✔ object-hash 17,877 ops/sec 6.58x\n ✔ hash-it † 44,260 ops/sec 2.66x\n ✔ json-stable-stringify 41,899 ops/sec 2.81x\n ✔ fast-json-stable-stringify 70,452 ops/sec 1.67x\n ✔ tiny-stable-stringify 62,336 ops/sec 1.89x\n ✔ json-stringify-deterministic 43,571 ops/sec 2.70x\n ✔ json-sorted-stringify 62,523 ops/sec 1.88x\n ✔ canonicalize 37,471 ops/sec 3.14x\n ✔ swr/_internal/stableHash 34,445 ops/sec 3.41x\n ✔ @tufjs/canonical-json 28,960 ops/sec 4.06x\n\ndeep circular\n+ ✔ object-identity 169,652 ops/sec\n ✔ safe-stable-stringify 133,794 ops/sec 1.27x\n ✔ ohash 58,065 ops/sec 2.92x\n ✔ object-hash 22,029 ops/sec 7.70x\n ✔ hash-it † 62,480 ops/sec 2.72x\n ✘ json-stable-stringify\n ✔ fast-json-stable-stringify 94,420 ops/sec 1.80x\n ✘ tiny-stable-stringify\n ✔ json-stringify-deterministic 62,684 ops/sec 2.71x\n ✘ json-sorted-stringify\n ✘ canonicalize\n ✔ swr/_internal/stableHash 54,642 ops/sec 3.10x\n ✘ @tufjs/canonical-json\n\nbig\n+ ✔ object-identity 11,664 ops/sec\n ✔ safe-stable-stringify 7,097 ops/sec 1.64x\n ✔ ohash 3,287 ops/sec 3.55x\n ✔ object-hash 1,940 ops/sec 6.01x\n ✔ hash-it † 3,583 ops/sec 3.26x\n ✔ json-stable-stringify 4,396 ops/sec 2.65x\n ✔ fast-json-stable-stringify 6,219 ops/sec 1.88x\n ✔ tiny-stable-stringify 5,771 ops/sec 2.02x\n ✔ json-stringify-deterministic 4,448 ops/sec 2.62x\n ✔ json-sorted-stringify 5,719 ops/sec 2.04x\n ✔ canonicalize 3,799 ops/sec 3.07x\n ✔ swr/_internal/stableHash 3,536 ops/sec 3.30x\n ✔ @tufjs/canonical-json 2,542 ops/sec 4.59x\n\nleafy\n+ ✔ object-identity 41,925 ops/sec\n ✔ safe-stable-stringify 20,088 ops/sec 2.09x\n ✔ ohash 32,586 ops/sec 1.29x\n ✔ object-hash 11,693 ops/sec 3.59x\n ✔ hash-it † 12,092 ops/sec 3.47x\n ✔ json-stable-stringify 8,863 ops/sec 4.73x\n ✔ fast-json-stable-stringify 16,968 ops/sec 2.47x\n ✔ tiny-stable-stringify 9,269 ops/sec 4.52x\n ✔ json-stringify-deterministic 8,680 ops/sec 4.83x\n ✔ json-sorted-stringify 9,522 ops/sec 4.40x\n ✔ canonicalize 10,858 ops/sec 3.86x\n ✔ swr/_internal/stableHash 7,982 ops/sec 5.25x\n ✔ @tufjs/canonical-json 4,714 ops/sec 8.89x\n```\n\n

\n\n\n> `object-identity` only handles mainly JSON-like data by design. It won't fingerprint functions or\n> every Node builtin the way some alternatives do, so these numbers only reflect the payloads it\n> targets.\n\n## License\n\nMIT © [Marais Rossouw](https://marais.io)\n","editable",false,"branch","documentNavigation","repo","maraisr/object-identity","repoId","aab75610-33c5-41e6-a0ff-b9e5178a7ee1","ownerId","user:599459","site","nexthub","private","admin","settings","maintainer","triage","starred","stars",0,"watchers",1,"watching","pinned","notify","views",[118,119,120,121,122,123,124,125,126,127,128,129,130],"navigation",{"_56":57,"_78":79,"_80":81,"_82":83,"_84":85,"_86":87,"_88":89},"sources",[],"viewer","meta",{"_71":72,"_73":74,"_75":72,"_43":32,"_76":14,"_77":32,"_49":50,"_51":52},"branches",[14],"tags",[],"cloneUrl","https://git.nexthub.sh/maraisr/object-identity.git","description","","owner","maraisr","section","head","empty","pins",[100,101,102],"documents",{"_97":98,"_99":50},"code",{"_94":95,"_96":50},"automations",{"_92":52,"_93":-5},"delivery",{"_90":50,"_91":-5},"tag","RRyYGQsMb4A3zr2ndz0H-cRwLG8","releases","applications","workflows","deployments","commits",102,"changes","counts",{},"total",{"_103":96,"_105":116,"_15":96,"_107":117,"_54":109,"_110":32,"_111":109,"_112":50},{"_103":113,"_105":114,"_15":113,"_107":115,"_54":109,"_110":32,"_111":109,"_112":50},{"_103":104,"_105":106,"_15":104,"_107":108,"_54":109,"_110":32,"_111":109,"_112":50},"id","issues","name","Issues","filters",{},true,"saved","pinnable","count","tasks","Tasks",{},"Changes",{},{"_103":96,"_105":116,"_15":96,"_107":161,"_54":109,"_110":32,"_111":109},{"_103":113,"_105":114,"_15":113,"_107":160,"_54":109,"_110":32,"_111":109},{"_103":104,"_105":106,"_15":104,"_107":159,"_54":109,"_110":32,"_111":109},{"_103":156,"_105":157,"_15":156,"_107":158,"_54":32,"_110":32,"_111":109},{"_103":153,"_105":154,"_15":153,"_107":155,"_54":32,"_110":32,"_111":109},{"_103":92,"_105":151,"_15":84,"_107":152,"_54":32,"_110":32,"_111":109},{"_103":93,"_105":148,"_15":149,"_107":150,"_54":32,"_110":32,"_111":109},{"_103":90,"_105":146,"_15":90,"_107":147,"_54":32,"_110":32,"_111":109},{"_103":142,"_105":143,"_15":144,"_107":145,"_54":32,"_110":32,"_111":109},{"_103":80,"_105":140,"_15":80,"_107":141,"_54":32,"_110":32,"_111":32},{"_103":137,"_105":138,"_15":137,"_107":139,"_54":32,"_110":32,"_111":32},{"_103":134,"_105":135,"_15":134,"_107":136,"_54":32,"_110":32,"_111":32},{"_103":131,"_105":132,"_15":131,"_107":133,"_54":32,"_110":32,"_111":32},"decisions","Decisions",{},"changelog","Changelog",{},"roadmap","Roadmap",{},"Documents",{},"activity","Activity","insights",{},"Releases",{},"Deployments","automations/deployments",{},"Workflows",{},"discussions","Discussions",{},"goals","Goals",{},{},{},{},"groups","user","agents",[],"now",1794433518681,"sidebar","expanded"]