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Examples
{"name":"Aizity","tools":["json","base64"]}{
"name": "Aizity",
"tools": [
"json",
"base64"
]
}Free JSON Formatter, Validator, Diff, and Schema Checker (Online)
Use this JSON formatter and JSON validator to pretty print JSON, beautify JSON, minify JSON, and debug JSON with a built‑in Problems panel. This free JSON pretty printer and JSON viewer runs locally in your browser.
What you can do with this JSON tool
- Pretty print / format JSON with 2‑space or 4‑space indentation
- Minify JSON (one line) for APIs and logs
- Sort JSON keys for stable output and easier review
- Validate JSON with exact line/column errors
- JSON Schema validation (built‑in presets + paste your own schema)
- Compare two JSON files with side‑by‑side diff
- Generate code from JSON: TypeScript types, Zod schema, and JSON Schema
- Save snippets locally (browser) and optionally to your account (sync + share links)
- Export: copy, download
.json, copy as JSON string, base64url encode/decode
Privacy
This JSON formatter is designed to run locally in your browser. Formatting, validation, diff, and code generation do not require uploading your JSON.
How to format JSON online
- Paste JSON into the editor.
- Click Format (or Minify).
- Open Problems to see validation errors and schema warnings.
JSON Pretty Print Example
Input:
{"name":"Aizity","tools":["json","base64"],"active":true}Output:
{
"active": true,
"name": "Aizity",
"tools": ["json", "base64"]
}Validate JSON (and fix common errors)
- Trailing commas → use JSONC mode, then convert to strict JSON
- Single quotes → JSON requires double quotes
- Missing braces/brackets → check the first error location in Problems
Validate against JSON Schema
Turn on Schema validation, pick a preset (like package.json / tsconfig.json) or paste your own schema, then click Apply.
Compare JSON (Diff)
Open the Diff tab, paste your second JSON on the right side, and enable Semantic diff to compare with sorted keys + formatting (great for API response comparisons).
Generate TypeScript / Zod / JSON Schema
Open Codegen to generate:
types.ts(TypeScript types)schema.zod.ts(Zod validation schema)schema.json(JSON Schema)
FAQ
Is this JSON formatter free?\nYes.\n\n Is this a JSON validator too?\nYes—syntax errors and schema validation are supported.\n\n Is my JSON uploaded?\nNo—this tool runs locally in your browser.\n\n Can I pretty print JSON online?\nYes—paste JSON and click Format.