JSON Formatter & Validator

Paste your JSON on the left, then click Format JSON or Minify JSON. Validation happens automatically in your browser — we do not upload your data.

Why use a JSON Formatter & Validator?

JSON is the backbone of modern APIs, configs, and data pipelines — but it quickly becomes hard to read when everything is on a single line. A JSON formatter helps you:

• Pretty-print compact or minified JSON from APIs and logs.
• Catch missing commas, quotes, or brackets instantly.
• Debug nested objects and arrays visually.
• Prepare clean JSON for documentation or code reviews.

The Dev Brains AI JSON tool keeps everything on the client side: paste, format, validate, and copy — without sending data to a server.

Tips for Working with JSON

• Ensure all keys are in quotes, e.g., "name": "Dev Brains".
• Use commas between items, but not after the last item in an object or array.
• Booleans and null are written as true, false, null without quotes.
• Remember that JSON does not support comments — remove // or /* ... */.

For advanced debugging, you can combine this formatter with your browser DevTools or API clients like Postman and Insomnia.

FAQ: JSON Formatter & Validator

JSON guides, by topic

Parsing & validation

• JSON parsing errors — common causes and fixes
• Validate JSON in Python and JavaScript
• Free online JSON formatter — full guide

Schema & type generation

• JSON Schema generator tutorial
• JSON Schema validation in Node.js with Ajv
• JSON to TypeScript Converter

Working with JSON in code

• Python JSON serialization — fixing the not-serializable error
• Large JSON files in Node.js — avoiding heap out of memory
• Flatten nested JSON in JavaScript
• JSON minify vs pretty print
• Comparing two JSON objects

Comparisons & format choices

• JSON vs XML for APIs
• YAML vs JSON — key differences
• YAML vs JSON vs TOML for config
• Convert YAML to JSON safely
• JSON to CSV conversion

APIs & real-world payloads

• REST API JSON response best practices
• JSON formatter for Indian GST APIs