JSON Formatter

JSON is the lingua franca of web development: APIs speak it, config files are written in it, half of Germany ships data in curly braces. Only, raw JSON from an API response is often one single endless line - technically correct, unreadable for humans. The JSON Formatter turns it into a cleanly indented, colour-highlighted structure in seconds.

Formatting is just the start. The tool validates your input and on an error shows not only that something is wrong but also the line and column where it trips - no more hunting for the one forgotten comma. Conversely it minifies your JSON in one click when you need it compact for a request or config. Indentation with two or four spaces is your call.

For large or deeply nested structures there is the tree view. Instead of scrolling through hundreds of lines, you expand and collapse the levels that interest you. A search and highlight finds keys and values across the document, and a lean JSONPath query pulls out individual values directly, without navigating the nesting by hand.

The formatter does more than display. It converts your JSON into other formats: to CSV when you want an array of objects in a table or into Excel; to YAML for configs and pipelines; and even into a TypeScript interface that models the shape of your data as a type - a time-saver when you are coding against a foreign API. A stats view reveals depth, number of keys, value types and size at a glance.

The repair function is especially handy. It strips JSONC comments, replaces single with double quotes, adds missing quotes around keys, removes stray trailing commas before brackets and closes open brackets - exactly the errors that arise from copy-pasting out of logs and editors. Almost-JSON becomes valid JSON. A basic schema validation additionally checks types, required fields and value ranges against a JSON Schema.

So you not only process JSON but understand it, the tool ships a set of ready examples - from a simple API response to German bureaucratic structures like a tax assessment, a land registry entry, a SEPA transfer or ELSTER data. Ideal for trying things out and learning.

Everything runs client-side. Your data is not uploaded, not logged, not stored. That is not just fast but the right choice when your JSON contains real customer data, tokens or internal structures. Free, no signup, right in the browser.