JSON Tools

JSON Tools — 8 free browser-based developer tools including JSON Formatter & Viewer, JSON Validator and JSON Diff. Everything runs locally with no signup or uploads, so your data stays private and results are instant.

8 tools

JSON Formatter & ViewerJSON formatter and viewer that beautifies minified or single-line JSON with proper indentation, shows it in a collapsible tree and flags syntax errors. Free and instant in your browser.

JSON ValidatorJSON validator that checks whether a JSON string is syntactically valid and pinpoints the exact line and column of any error. Fix missing commas or quotes in seconds, free in your browser.

JSON DiffJSON diff tool that compares two JSON objects side by side and color-highlights added, deleted and changed keys. It traverses nested structures deeply so every difference stands out, free in your browser.

JSON to YAML ConverterFree online tool to convert between JSON and YAML in both directions, auto-detecting the input format and preserving indentation and nested structure.

JSON to CSV ConverterJSON to CSV converter that also turns CSV back into JSON, flattening nested objects along the way. Download the CSV file or copy the result in one click, free and instant in your browser.

JSON to XML ConverterJSON to XML converter that works in both directions, auto-detecting the input and mapping objects to elements or tags to keys. The result comes back cleanly formatted and ready to copy, for free.

JSON Path FinderJSONPath finder that renders JSON as an interactive tree and copies the JSONPath of any node you click. Locate fields in large API responses in seconds, free and instant in your browser.

JSON Schema GeneratorJSON Schema generator that infers types, required fields and nested structures from sample JSON data. The output is ready for API documentation and data validation, free in your browser.

How to Use

1
Validate before anything else— Paste the payload into the JSON Validator: it reports the exact line and column of the first syntax error and flags duplicate keys.
2
Format and explore— The JSON Formatter re-indents the document and opens it as a collapsible tree, and JSON Path Finder copies the JSONPath of any node you click.
3
Convert or compare— Turn the result into CSV, YAML or XML with the converters, diff two payloads with JSON Diff, or infer a spec with the JSON Schema Generator.

Frequently Asked Questions

Start with the JSON Validator — it reports the exact line and column of the syntax error and flags duplicate keys, which usually comes down to a missing comma or an unquoted key. Once it parses, the JSON Formatter re-indents it and shows a collapsible tree so you can read a large API response.

No. Every tool in this category runs on the browser's own JSON engine, so the data never leaves the tab. That makes it safe to paste API responses containing access tokens or customer records.

Yes, and all three converters work in both directions. JSON to CSV flattens nested objects into columns, while the YAML and XML converters auto-detect which format you pasted. If you need a contract rather than a conversion, the JSON Schema Generator infers types and required fields from a sample.