Tools / Category

JSON & Data tools

Format, validate, convert and generate test data.

JSON Formatter Free online JSON formatter for testers. Pretty-print API responses, sort keys, and see the exact line and column of syntax errors. Runs in your browser.
JSON Validator Validate JSON syntax online. Get the precise line and column of errors like trailing commas or unquoted keys, plus a structure summary. Free, no upload.
JSON Minifier Minify JSON online by removing all insignificant whitespace. Useful for request bodies, environment variables and fixtures. Shows bytes saved. Free.
JSON Diff Checker Compare expected and actual JSON semantically. Key order is ignored, every change gets a path like $.user.roles[1], and array order can be ignored too.
JSONPath Tester Test JSONPath expressions online against your API responses. See each matching value with its exact path, use filters safely, and learn from the cheatsheet.
JSON Schema Validator Validate API responses against JSON Schema draft 2020-12 or draft-07 with readable errors and paths. Generate a starter schema from a sample response. Free.
Random Test Data Generator Generate up to 1,000 rows of realistic fake test data: names, emails, addresses, UUIDs, dates, ranges and enums. Seedable, and exports JSON, CSV or SQL.
UUID Generator Generate up to 500 UUID v4 or time-ordered v7 values with formatting options, and inspect any UUID to see its version, variant and embedded timestamp.
CSV to JSON Converter Convert CSV to JSON in your browser. RFC 4180 parsing with quoted fields and line breaks, delimiter auto-detection, header row and number/boolean inference.
JSON to CSV Converter Convert JSON to CSV online. Nested objects are flattened to dot-notation columns, arrays become indexed columns or JSON, and fields are quoted per RFC 4180.
XML Formatter Format and minify XML online. Checks well-formedness first, then indents with 2 or 4 spaces or tabs while keeping CDATA, comments and processing instructions.
XML Validator Check whether XML is well-formed: mismatched tags, bad nesting, unescaped & or < and duplicate attributes are reported with line and column where available.
Base64 Encoder / Decoder Encode and decode Base64 or URL-safe Base64URL with full UTF-8 support. Encode files to Base64 or data: URLs and get clear errors for invalid input.
JWT Decoder Decode a JWT locally to read its header and claims, see exp, iat and nbf as real dates with expiry status, and spot alg none and other risks. Never uploaded.
Regex Tester Test JavaScript regular expressions with live match highlighting, capture and named groups with indices, replace preview and ready-made QA patterns. Free.
XPath & CSS Selector Tester Test XPath and CSS selectors against your HTML. See the match count, each matched element and a highlighted preview, plus a cheatsheet of XPath axes and CSS.