JSON Formatter
Parse and pretty-print JSON with configurable indentation.
About JSON Formatter
JSON Formatter parses JSON and pretty-prints it with the indentation you choose, turning a minified blob into clean, readable structure. It is the quickest way to make an API response or config file legible, and it flags invalid JSON along the way. Everything runs in your browser, so payloads with sensitive data stay local.
- Category
- inspect
- Input
- Accepts: text/plain or application/json.
- Output
- Outputs: application/json.
- Cost
- Free, runs in your browser
- Memory
- low
Common uses
- Pretty-print a one-line API response so you can actually read the nested fields
- Reformat a minified config file with consistent 2-space or 4-space indentation
- Sanity-check that a JSON payload is valid before pasting it into code
- Tidy up JSON copied from logs into a reviewable shape for a pull request
- Normalize indentation across JSON files so diffs stay clean
- Inspect a webhook body's structure without piping it through a command-line tool
Frequently asked questions
What indentation options are there?
You choose the indent width used for pretty-printing, so you can match your project's 2-space or 4-space convention.
Does it tell me if my JSON is broken?
Yes. Invalid JSON fails to parse and the tool surfaces the problem rather than producing garbled output, so it doubles as a quick validity check.
Is my JSON sent to a server?
No. Parsing and formatting happen entirely in your browser, so even JSON containing secrets or personal data stays on your device.
Can it accept plain text input?
Yes. It accepts both text/plain and application/json input, so you can paste raw text and it will be parsed as JSON.
Does it change my data?
No. It only reformats whitespace and indentation. Keys, values, and structure are preserved exactly.
Keywords
- json
- format
- pretty
- indent
- beautify