Format, validate, minify and explore JSON with syntax highlighting, tree view, and smart error detection. Drag & drop files or paste directly — 100% client-side.
Format / Beautify — pretty-prints your JSON with proper indentation, line breaks, and consistent spacing. Choose between 2 spaces, 4 spaces, 8 spaces, or tab indentation with full syntax highlighting.
Minify / Compress — removes all unnecessary whitespace to produce the smallest JSON string. Ideal for APIs and network payloads.
Validate — checks syntax and reports the exact position of any errors. Detects trailing commas, missing quotes, single quotes, and unescaped characters.
Tree View — visualises JSON as a collapsible tree. Expand and collapse objects/arrays to explore nested data with type and child count labels.
Auto-Fix — repairs single quotes, trailing commas, unquoted keys, and strips JS comments automatically.
Yes. This JSON formatter runs 100% in your browser. No data is sent to any server, stored, or logged. You can verify by going offline — the tool still works.