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🧪 JSON.stringify Playground

Interactively explore JSON.stringify options. Try replacer arrays or functions, adjust indentation, and inspect replacer call traces.

JSON.stringify Playground

Experiment with JSON.stringify without leaving the browser. Toggle replacers, indentation, key ordering, and inspect the replacer call trace to understand exactly how serialization works.

Input JSON

Edit the source payload you want to stringify.

Replacer mode

Replacer function body

Indentation: 2Trace replacer calls

Stringify Output

Custom replacer function

JSON.stringify(value, replacer, 2);

{
  "email": "ada@example.com",
  "id": 42,
  "metrics": {
    "conversion": 0.48,
    "createdAt": "1843-12-10T00:00:00.000Z",
    "visits": 1234
  },
  "name": "Ada Lovelace",
  "roles": [
    "admin",
    "editor"
  ]
}

222 characters14 lines

Replacer Trace

KeyIncoming valueReturned value

(root){"email":"ada@example.com","id":42,"metrics":{"conversion":0.4821,"createdAt":"1843-12-10T00:00:00.000Z","visits":1234},"name":"Ada Lovelace","password":"supers3cret","roles":["admin","editor"]}{"email":"ada@example.com","id":42,"metrics":{"conversion":0.4821,"createdAt":"1843-12-10T00:00:00.000Z","visits":1234},"name":"Ada Lovelace","password":"supers3cret","roles":["admin","editor"]}

emailada@example.comada@example.com

id4242

metrics{"conversion":0.4821,"createdAt":"1843-12-10T00:00:00.000Z","visits":1234}{"conversion":0.4821,"createdAt":"1843-12-10T00:00:00.000Z","visits":1234}

conversion0.48210.48

createdAt1843-12-10T00:00:00.000Z1843-12-10T00:00:00.000Z

visits12341234

nameAda LovelaceAda Lovelace

passwordsupers3cretundefined

roles["admin","editor"]["admin","editor"]

0adminadmin

1editoreditor

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