highjson

The high-fidelity JSON workbench

Six precision tools for everyday JSON. Pick one to begin — your data never leaves the browser.

Compare

Diff two JSON documents across tree, unified & graph views — with smart array matching so reordered items aren't flagged as noise.

− "role": "engineer"
+ "role": "principal"
~ "verified": true
  • Tree · Unified · Graph
  • Smart array matching
  • Share & export

Format

Beautify, minify, validate, sort keys and one-click repair broken input. Explore the structure as a collapsible tree.

{
"name": "ada",
"tags": [2]
}
  • Beautify / minify
  • Repair · validate
  • Tree · JSONPath

Convert

Turn JSON into YAML, XML, CSV, TOML, JSON5, NDJSON or a query string — and back — live, with a one-click swap.

JSONYAML · XML · CSV …
  • 8 formats
  • Both directions
  • Live & private

Types

Generate TypeScript, Zod, JSON Schema, Pydantic, Go, Rust or Kotlin types from a JSON sample — named types, unions and optionals included.

interface Root { … }
  • TS · Zod · Schema
  • Python · Go
  • Rust · Kotlin

Validate

Check JSON against a JSON Schema and get every violation with its exact path — or infer a schema from your data in one click.

/amount · must be number
✓ /items/0 valid
  • Draft 2020-12
  • Exact error paths
  • Infer schema

Query

Extract exactly the data you need with JSONPath — filters, slices and deep scans — as values, paths or path-value pairs.

$.users[?(@.active)].name
  • JSONPath
  • Filters & slices
  • Copy result

100% client-side · no sign-up · open it, paste, go