Developer Tools
12 free tools — precise calculations, instant results.
json formatter
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json to csv
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csv to json
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html minifier
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css minifier
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js minifier
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markdown to html
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yaml to json
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xml to json
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regex tester
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jwt decoder
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hash generator
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About Developer Tools
Developer tools help software engineers format, validate, convert, and debug data formats including JSON, XML, YAML, CSV, Markdown, and more. All tools run in your browser with no data uploads.
JSON: The Universal Data Format
JSON (JavaScript Object Notation) is the dominant data interchange format for REST APIs, configuration files, and databases. Its strict syntax—double-quoted keys, no trailing commas, no comments—is both its strength and the source of most debugging headaches. Our JSON formatter validates syntax, highlights errors on specific lines, and prettifies minified payloads instantly.
Regular Expressions: Pattern Matching in Code
Regular expressions (regex) are sequences of characters that define a search pattern. They are used for input validation, text parsing, search-and-replace operations, and URL routing. A regex that validates email addresses can check thousands of records in milliseconds. Our regex tester provides real-time match highlighting and supports all standard JavaScript regex flags.
JWT Tokens and Security
JSON Web Tokens (JWT) are used for authentication in modern web applications. A JWT contains three Base64URL-encoded parts: a header (algorithm), payload (claims), and signature. The signature prevents tampering but does NOT encrypt the payload—base64 is encoding, not encryption. Our JWT decoder reveals the payload contents without a secret key, useful for debugging auth flows.
Frequently Asked Questions
Is JSON the same as JavaScript?
No. JSON is a data format derived from JavaScript object syntax, but it is language-independent. JSON requires double-quoted keys and does not support functions, undefined, or comments.
Can I test regex patterns safely online?
Yes. Our regex tester runs entirely in your browser using JavaScript's native RegExp engine. No data is sent to any server.
What is the difference between Base64 encoding and encryption?
Base64 encoding converts binary data to ASCII text for safe transport. It provides NO security—anyone can decode it instantly. Encryption uses a key to scramble data so that only authorized parties can read it.