Beautify & pretty-print JSON

Why pretty-print JSON?

Examples

{"id":1,"tags":["a","b"]}

{
  "id": 1,
  "tags": ["a", "b"]
}

{"a":1,"b":{"c":2}}

{
	"a": 1,
	"b": {
		"c": 2
	}
}

{"name":"Ada","age":36,"id":7}

{
  "age": 36,
  "id": 7,
  "name": "Ada"
}

Use cases

• Code review

  Format JSON fixtures before committing so reviewers see meaningful diffs, not whitespace churn.

• Reading log payloads

  Pipe a single-line log entry through the formatter to see the structure in seconds.

• Building documentation

  Pretty-print API examples for your docs site. Consistent indent across every example.

• Snapshot testing

  Sort keys before snapshotting so test output doesn't flip when serializers reorder fields.

• Sharing in chat

  Paste a formatted JSON block into Slack or GitHub instead of one unreadable line.

Frequently asked questions

Format JSON in code

JavaScript, Python, Go, and Ruby snippets — copy and paste into your project.

import { readFileSync, writeFileSync } from "node:fs";

const data = JSON.parse(readFileSync("input.json", "utf8"));
writeFileSync("output.json", JSON.stringify(data, null, 2));

{"name":"Ada","age":36,"skills":["math","compilers"]}

{
  "name": "Ada",
  "age": 36,
  "skills": [
    "math",
    "compilers"
  ]
}

echo '{"a":1,"b":2}' | node -e \
  'process.stdin.on("data", d => console.log(JSON.stringify(JSON.parse(d), null, 2)))'

{
  "a": 1,
  "b": 2
}

Other JSON tools on JSON FYI

Every flow you need — formatter, validator, viewer, pretty print, repair, and the full workbench.

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