JSON Validator

Validate JSON syntax with clear errors and optional JSON Schema checks—runs locally in your browser.

Popular tools

Buffer Alpha
Local Session
Initialising Core...
JSON Schema
Initialising Core...
AES-256 Encrypted
Zero Latency
V8 Core

Examples

Use the sample payload below, or click Load example to fill the editors automatically.

Example input

{"id":1,"name":"demo","tags":["alpha","beta"]}

Example output

{
  "id": 1,
  "name": "demo",
  "tags": [
    "alpha",
    "beta"
  ]
}

How to use

  1. Paste JSON in the input panel (Buffer Alpha).
  2. Click Format to pretty-print, or Validate on the toolbar to check RFC 8259 syntax.
  3. Optional: edit the JSON Schema in the lower panel, then run Validate with schema to check structure.
  4. Use the inspector for text, tree, or table views when the document is valid JSON.

Features

  • Syntax validation with clear error hints
  • Optional JSON Schema validation (Draft 2020-12 / common Draft-07 schemas) via Ajv
  • Monaco editor with JSON highlighting for both instance and schema
  • Runs locally in your browser

Related tools

Guides

Read related engineering guides on JsonOnlineParse.

FAQ

Does this support JSON Schema?

Yes. On this page you can paste a JSON Schema and validate your JSON instance against it. Syntax-only checks work without a schema.

Is JsonOnlineParse free?

Yes. These tools are free to use and do not require an account.

Is my JSON uploaded to your servers?

Editor operations such as format and validate run locally in your browser. Avoid sharing secrets in URLs if you use the optional link encoding.

What if I see invalid JSON?

The editor surfaces syntax issues when possible. Fix unclosed brackets, trailing commas, or bad quotes, then run Format or Validate again.