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JSON Toolkit

Free online tools to format, minify, diff, convert, validate, and inspect JSON in your browser. Includes JSON/YAML/XML/CSV/Excel/TypeScript conversion, JSON Schema, JSONPath, and JWT tools. All processing runs locally in your browser with no upload required.

All processing runs locally in your browser. Input data is not uploaded to a server, which helps with sensitive data.

Popular JSON tools

JSON FormatterFree online JSON / JSONC / JSON5 formatter to format, minify, and validate data with comments, trailing commas, tree view, and node operationsJSON Repair / CleanFree online JSONC / JSON5 repair tool for comments, trailing commas, single quotes, unquoted keys, and other common JSON issuesJSON ↔ YAMLFree online JSON to YAML and YAML to JSON converterJSON → TypeScriptFree online tool to infer and generate TypeScript interface types from JSON / JSONC / JSON5Regex TesterFree online regular expression tester with flags, named groups, highlighted matches and common templatesTimestamp ConverterFree online Unix timestamp and date converter with second, millisecond, microsecond precision and multiple time zonesUUID GeneratorFree online UUID v1 / v4 / v7 and NanoID generator with batch output, case toggle and hyphen removalColor ConverterFree online color format converter between HEX, RGB, HSL, HSV, CMYK with a live swatch previewJWT ParserFree online JWT parser to decode tokens, inspect Header / Payload, and verify HS256 signatures

All JSON tools

Format

JSON FormatterFree online JSON / JSONC / JSON5 formatter to format, minify, and validate data with comments, trailing commas, tree view, and node operationsJSON EscapeFree online JSON escape tool to minify and escape JSON / JSONC / JSON5 for embedding in strings, or unescape backJSON Repair / CleanFree online JSONC / JSON5 repair tool for comments, trailing commas, single quotes, unquoted keys, and other common JSON issuesJSON DiffFree online JSON / JSONC / JSON5 diff tool to visually compare two documents, highlighting additions, removals, and changes

Convert

JSON ↔ YAMLFree online JSON to YAML and YAML to JSON converterJSON ↔ XMLFree online JSON to XML and XML to JSON converterJSON → CSVFree online tool to export a JSON / JSONC / JSON5 array as a CSV fileJSON → ExcelFree online tool to export a JSON / JSONC / JSON5 array as an Excel (.xlsx) file with multi-level fields flattened automaticallyExcel → JSONFree online tool to read an Excel (.xlsx/.xls) file and convert it to a JSON array, restoring multi-level fields with >JSON → TypeScriptFree online tool to infer and generate TypeScript interface types from JSON / JSONC / JSON5JSON Flatten / UnflattenFree online tool to flatten nested JSON / JSONC / JSON5 into path keys, or restore nested structures from path keys

Validate

JSON Schema GeneratorFree online JSON Schema generator that automatically infers a schema from a sample JSON / JSONC / JSON5 documentJSON Schema ValidatorFree online JSON Schema validator that checks JSON / JSONC / JSON5 data and shows error paths and reasonsJSONPath QueryFree online JSONPath query tool to extract nested fields from JSON / JSONC / JSON5 using JSONPath expressionsJSON StatsFree online JSON / JSONC / JSON5 statistics tool to analyze nesting depth, key count, type distribution, and size comparisonRegex TesterFree online regular expression tester with flags, named groups, highlighted matches and common templatesCron Expression ParserFree online Cron expression parser that converts to human-readable text and previews the next N run times

Encode / Decode

Timestamp ConverterFree online Unix timestamp and date converter with second, millisecond, microsecond precision and multiple time zonesUUID GeneratorFree online UUID v1 / v4 / v7 and NanoID generator with batch output, case toggle and hyphen removalColor ConverterFree online color format converter between HEX, RGB, HSL, HSV, CMYK with a live swatch previewURL / Query String BuilderFree online URL and query string parser and builder with add, edit, encode parameters and live previewJWT ParserFree online JWT parser to decode tokens, inspect Header / Payload, and verify HS256 signatures

FAQ

Does JSON Toolkit upload my data?

No. Formatting, conversion, analysis, JWT parsing, and file processing run locally in your browser. The server does not receive your input.

Which JSON-related formats are supported?

JSON, YAML, XML, CSV, Excel, TypeScript interfaces, JSON Schema, JSONPath, and JWT are supported. Image compression, background removal, and format conversion are available from the top image toolbar.

Are these tools free to use?

Yes. All tools are free to use online, require no account, and run directly in your browser.

Does the JSON formatter support loose syntax?

Yes. It accepts common loose input such as unquoted object keys and single-quoted strings for faster debugging.