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Regex Tester

Regex

Regex Tester

Matches

What is Regex Tester?
Regex Tester is a focused debugging helper for everyday API and web development tasks. Test JavaScript regular expressions against sample text.
The tool runs locally after the page loads, making it suitable for quick checks while keeping copied strings, tokens, and snippets off remote utility services.
How to use Regex Tester
Paste the value you want to inspect or transform, adjust any visible options, then run Regex Tester. Use the editable result area when you need to inspect or reuse generated text.
Available actions
  • Test Regex
  • Set regex pattern
  • Set regex flags
  • Highlight matches
Example
Input
Contact api@example.com or support@jsonfather.com for help.
Output
{
  "matchCount": 2,
  "matches": [
    {
      "match": "api@example.com"
    }
  ]
}
FAQ
Does Regex Tester send data to JSONFather?
No. Debug operations run in the browser.
Can this verify secrets or signatures?
No. It is designed for local decoding, generation, and inspection. Signature verification still requires the appropriate secret or public key.
Can I use it for API debugging?
Yes. These tools are intended for API payloads, URLs, tokens, timestamps, hashes, and text matching.
Base64Encode or decode Base64 text.URL CodecEncode or decode URL components.JWT DecoderDecode JWT header and payload.UUIDGenerate random UUID v4 values.MD5 / SHA256Calculate MD5 and SHA256 hashes.TimestampConvert Unix time and date strings.
Tool Map
JSON Tools
FormatterBeautify, minify, sort, escape, and unescape JSON.MinifierCompress JSON without changing the parsed value.ValidatorCheck syntax, duplicate keys, and document stats.ViewerExplore JSON as a searchable tree.DiffCompare two JSON values by path.JSONPathTest RFC 9535 JSONPath queries.SchemaGenerate a starter JSON Schema.
Converters
JSON to YAMLConvert JSON into readable YAML.YAML to JSONParse YAML and output formatted JSON.JSON to XMLTurn JSON objects into formatted XML.XML to JSONParse XML into formatted JSON.JSON to CSVExport arrays and objects as CSV.CSV to JSONConvert CSV rows into JSON arrays.JSON to TOMLConvert JSON config into TOML.TOML to JSONParse TOML into formatted JSON.
API Tools
API MockGenerate mock routes from sample JSON.TypeScriptGenerate TypeScript interfaces.Java ClassGenerate Java classes from JSON.Go StructGenerate Go structs with JSON tags.C# ClassGenerate C# class properties.Python DataclassGenerate Python dataclasses.Dart ModelGenerate Dart models with fromJson.Swift ModelGenerate Swift Codable models.
Debug Tools
Base64Encode or decode Base64 text.URL CodecEncode or decode URL components.JWT DecoderDecode JWT header and payload.UUIDGenerate random UUID v4 values.MD5 / SHA256Calculate MD5 and SHA256 hashes.TimestampConvert Unix time and date strings.RegexTest JavaScript regular expressions.