Free Online JSON Tool

Why Use Our JSON Formatter?

Our free online JSON beautifier helps you format, validate, and minify JSON data instantly. Whether you are a developer debugging an API, a data analyst inspecting a dataset, or a student learning JSON syntax, this tool makes your JSON readable and error‑free. Privacy first: All processing is local — nothing is uploaded to any server. Fast & reliable: Format large JSON objects in milliseconds.

How to Format JSON?

Paste your JSON into the input box above — an API response, a config file, a log line. Press Format, or hit Ctrl/Cmd + Enter. The document is parsed and re‑written with indentation. Choose the indent width from 1 to 20 if you need to match your project's style — changing it re‑runs the last action. Copy the result, download it as formatted.json, or switch to Minify when you want the opposite.

What Is JSON?

JSON (JavaScript Object Notation) is a text format for structured data, defined by RFC 8259 and used by almost every HTTP API, config file and document store today. It has six value types — string, number, object, array, true/false and null — and one document holds exactly one of them. Objects are quoted keys mapped to values: {"port": 8080}. Arrays are ordered lists of any values: [1, "two", null].