What is JSON?
JSON (JavaScript Object Notation) is a lightweight text format for storing and exchanging structured data. It is easy for people to read and write, and straightforward for software to parse and generate. JSON is widely used for APIs, application configuration, and data exchange between services.
How JSON works
JSON organizes information using objects and arrays. Objects contain named properties written as key-value pairs, while arrays contain ordered lists of values. Values can be strings, numbers, booleans, null, objects, or arrays. These structures can be nested to represent more complex information.
JSON syntax and formatting
Valid JSON uses double quotes around property names and string values, colons between keys and values, and commas between entries. Objects use curly braces and arrays use square brackets. JSON does not allow comments or trailing commas. Consistent indentation makes nested data easier to inspect without changing its meaning.
Why use a visual JSON editor?
A visual JSON editor presents nested data as an expandable tree, making it easier to navigate large documents without manually tracking braces and commas. You can inspect individual values, add or remove properties, and work with arrays and objects while retaining the underlying JSON structure.
JSON in APIs and applications
Many web APIs use JSON for requests and responses because it is compact, language-independent, and supported by common programming environments. Applications also use JSON for settings, metadata, and structured records. Keeping JSON well-formed helps prevent parsing errors when data moves between systems.
JSON objects versus arrays
Use an object when each value has a meaningful property name, such as a user profile with a name and email. Use an array when representing a sequence of items, such as a list of tasks or products. Arrays can contain objects, and objects can contain arrays, allowing both patterns to work together.