How to Format JSON Correctly

JSON (JavaScript Object Notation) is the dominant standard for exchanging data across web APIs and microservices. Despite its simplicity, minor syntax errors frequently cause broken deployments and failed requests.

Key Rules of Valid JSON

1. Double Quotes Only: Property keys and string values must be enclosed in double quotes ("key": "value"). Single quotes ('key') are invalid.
2. No Trailing Commas: The last key-value pair in an object or array must not end with a comma.
3. Valid Data Types: JSON supports Strings, Numbers, Booleans (true / false), Arrays ([]), Objects ({}), and null. Functions and undefined values are not permitted.

Common Errors & Fixes

1. Unquoted Property Names *Incorrect:* `{ name: "DevForge" }` *Correct:* `{ "name": "DevForge" }`

2. Single Quotes *Incorrect:* `{ 'type': 'tools' }` *Correct:* `{ "type": "tools" }`

Using Client-Side Tools for Privacy When debugging API payloads containing sensitive credentials or customer data, avoid third-party formatters that send data to servers. Use 100% browser-side tools like **DevForge JSON Formatter**.