JSON formatter
Validate, pretty-print, and minify JSON.
About this tool
Validate, pretty-print and minify JSON with clear error messages that point to what went wrong. A fast scratchpad for anyone working with APIs or config files.
Why use it
- Readable indentation makes nested structures easy to scan.
- Minify mode strips whitespace for the smallest possible payload.
- Catches syntax mistakes like trailing commas before they break your app.
Common use cases
- Tidy an API response before pasting it into documentation.
- Spot the missing bracket in a config file that will not load.
- Minify a JSON blob to embed in source code.
Tips
- If validation fails, check for trailing commas and unquoted keys first.
- Pretty-print while debugging, then minify for production.
How to use
- Paste JSON.
- Pretty or Minify.
- Fix errors if validation fails.
FAQ
- What does the JSON formatter do?
- It validates your JSON and pretty-prints it with consistent indentation, or minifies it to one line.
- Will it tell me where an error is?
- Yes, invalid JSON is flagged so you can find and fix the problem quickly.
- Is my JSON uploaded anywhere?
- No. Parsing and formatting happen in your browser, so sensitive data stays local.
- Can I minify as well as beautify?
- Yes, switch between a readable indented view and a compact single-line version.
- Does it keep my key order?
- Yes, keys are preserved in the order they appear in your input.
- Can it handle large JSON files?
- Yes, sizeable documents work fine; only your device memory is the limit.