JSON Formatter & Validator
Format, validate, and explore JSON data with tree view, table view, and syntax highlighting. Features JSONPath querying and detailed error messages with line numbers.
How to Use the JSON Formatter
Paste your JSON in the input area. The tool instantly validates the syntax and shows whether your JSON is valid. Choose between formatted view with custom indentation, an interactive tree view for exploring nested structures, or minified output for compact storage. Use the copy button to grab the result.
What Is JSON?
JSON (JavaScript Object Notation) is the most widely used data interchange format on the web. APIs, configuration files, databases, and messaging systems all use JSON. Valid JSON requires double-quoted strings, no trailing commas, and no comments. When you receive minified JSON from an API response, a formatter makes it human-readable by adding indentation and line breaks. Need to convert your formatted JSON to another format? Try our JSON to CSV converter or JSON to YAML converter. The tree view lets you collapse and expand nested objects, making it easy to navigate deeply nested structures.
Common Use Cases
Pretty-print minified API responses for debugging. Validate JSON configuration files before deployment. Explore complex nested data with the tree view. Minify JSON payloads to reduce bandwidth. Find syntax errors with precise line-number error reporting. If your JSON contains Base64-encoded data, decode it with our Base64 Encoder/Decoder. For JWT tokens with JSON payloads, use the JWT Decoder to inspect claims. All processing happens in your browser — your data stays private.