JSON Formatter
Format, validate, and minify JSON. Instant error detection with line numbers.
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Format and Validate JSON Online
JSON (JavaScript Object Notation) is the universal data format for APIs, configuration files, and data exchange. When working with raw JSON from an API response, a database export, or a config file, it's often minified — stripped of all whitespace to save bandwidth. That makes it nearly impossible to read or debug.
This JSON formatter instantly beautifies minified JSON with proper indentation, making nested objects and arrays easy to navigate. It also validates your JSON as you paste it, catching syntax errors like missing commas, unclosed brackets, or incorrect data types — with the exact position of the error so you can fix it fast.
Use the minify option to do the reverse: compact JSON into a single line for use in API calls, environment variables, or anywhere you need to minimize payload size.