Format, validate, beautify, and minify JSON data instantly with our free online JSON formatter and validator. Whether you are a developer working with REST APIs, a data analyst processing JSON files, or a student learning data structures, our tool makes working with JSON seamless and error-free. Paste any JSON string into the editor and immediately see it formatted with proper indentation, color-coded syntax highlighting, and collapsible tree view for easy navigation. The built-in validator checks for syntax errors in real time and highlights the exact location of any issues, saving you hours of debugging. Switch between formatted (beautified) and minified views with one click. Transform JSON data by converting keys, sorting properties, or escaping strings. Use the tree viewer to explore deeply nested JSON structures without getting lost. Every operation runs entirely in your browser — no data is ever sent to any server, making it safe for sensitive API responses, configuration files, and private data. Free, unlimited, and works offline.
Validate payloads, pretty-print responses, flatten nested keys, inspect deep paths, and generate instant TypeScript shapes from a single live workspace.
Your data is parseable and ready for transforms.
Track payload size while formatting or minifying.
Quick signal for how nested and tricky the structure is.
Useful for payload audits and mapping work.
Paste raw API responses, local config blobs, or exported data files. Format, minify, sort keys, and copy cleaned output without leaving the page.
Understand the shape fast, then extract exact nested values using dot notation like owner.name or tools[0].
Switch between a compact viewer, flattened path map, and auto-generated TypeScript so the same payload can serve debugging, documentation, and development workflows.