Format and validate JSON online
JSON is easy for machines to read but painful to scan when it arrives on a single minified line. This free JSON formatter beautifies messy JSON into clean, indented output, validates it for syntax errors, and minifies it back down when you need the smallest possible payload. Input and output sit side by side with live character counts, and a Tree view lets you explore nested objects and arrays instead of scrolling through raw text.
How to format and validate JSON
- Paste your JSON into the Input editor, or click Sample to load an example.
- Click Beautify to pretty-print it, or Minify to strip whitespace.
- Click Validate to check for syntax errors, and Sort keys to order object keys alphabetically.
- Pick your indentation — 2 spaces, 4 spaces, or a tab — then Copy output or Download .json.
What you can do with this JSON tool
- Debug API responses by pretty-printing them and spotting the exact line an error points to.
- Minify JSON for config files, embeds, or bandwidth-sensitive requests.
- Sort keys to produce stable, diff-friendly output across versions.
- Browse deeply nested data in the collapsible tree view instead of counting brackets by hand.
Your data never leaves your browser
Every operation — formatting, validating, minifying, sorting, and the tree view — runs entirely client-side in your browser. Nothing is uploaded or stored, so it is safe to paste production payloads, tokens, or customer data. Working with large language model payloads and want to cut token costs? Convert your data with the JSON to TOON converter. If your JSON is actually a token, decode it with our JWT decoder.
Need a custom tool or internal developer utility built for your team? Get in touch with SR Infobiz.