Developer tools
161 focused tools, ready to use in your browser.
JSON Formatter
Format and indent valid JSON in your browser, with downloadable output and clear syntax errors.
DeveloperJSON Viewer
Inspect a JSON document as a safe path, type, and value tree without executing its contents.
DeveloperJSON Validator
Check JSON syntax locally and see its root type, value count, and nesting depth.
DeveloperJSON to CSV
Convert a JSON array of objects into a quoted CSV table with spreadsheet formula protection.
DeveloperJSON to XML
Convert JSON into escaped, typed XML while preserving arbitrary object keys and array ordering.
DeveloperXML Formatter
Validate and indent XML locally, preserving mixed text content and rejecting entity declarations.
DeveloperYAML Formatter
Format standard YAML with readable indentation, duplicate-key checks, and bounded alias handling.
DeveloperBase64 Encoder
Encode Unicode text as standard Base64 using UTF-8, entirely in your browser.
DeveloperBase64 Decoder
Decode standard Base64 into UTF-8 text with strict alphabet, padding, and byte validation.
DeveloperURL Encoder
Percent-encode a URL component with UTF-8 for safe query parameter and path-segment use.
DeveloperURL Decoder
Decode percent-encoded URL components into readable Unicode text without navigating anywhere.
DeveloperJWT Decoder
Inspect a JWT header and payload locally, with an explicit reminder that signatures are not verified.
DeveloperUUID Generator
Generate cryptographically random version 4 UUIDs locally, individually or in batches of up to 1,000.
DeveloperUnix Timestamp Converter
Convert Unix seconds or milliseconds to UTC, or convert a timezone-explicit ISO date into a timestamp.
DeveloperRegex Tester
Test JavaScript regular expressions in an isolated worker with a 250 ms timeout and readable match positions.
DeveloperSQL Formatter
Format SQL queries with a selected dialect and consistent uppercase keywords, without connecting to a database.
DeveloperHTML Entity Converter
Escape HTML text delimiters and Unicode numerically, or decode basic and numeric character references.
DeveloperUUID Validator
Check UUID text shape, RFC variant and version, including Nil and Max special identifiers.
DeveloperULID Generator
Generate timestamp-prefixed ULIDs with 80 bits of browser-generated random data.
DeveloperSHA Hash Generator
Calculate SHA-256, SHA-384, or SHA-512 digests of exact UTF-8 text using Web Crypto.
DeveloperMD5 Hash Generator
Calculate the legacy MD5 digest of UTF-8 text for compatibility and checksum comparison.
DeveloperCRC32 and Adler32 Calculator
Calculate standard CRC-32/IEEE and Adler-32 checksums of UTF-8 text in one pass.
DeveloperHMAC Generator
Generate HMAC-SHA-256, SHA-384, or SHA-512 authentication codes from UTF-8 text and a key.
DeveloperSRI Hash Generator
Generate a Subresource Integrity SHA-2 token for exact pasted UTF-8 JavaScript or CSS contents.
DeveloperURL Parser
Inspect HTTP(S) URL components, normalized hostnames, and repeated query parameters without visiting a link.
DeveloperQuery String Converter
Convert URL query text to ordered JSON pairs, or serialize pairs while preserving duplicate names.
DeveloperNumber Base Converter
Convert signed integers between bases 2 through 36 using exact arbitrary-precision arithmetic.
DeveloperRobots.txt Generator
Build one crawler-rule group and optional sitemap lines with validated paths and URLs.
DeveloperCSP Policy Builder
Build a conservative Content-Security-Policy response header using exact HTTPS source origins.
DeveloperBase-N Encoding Workbench
Encode UTF-8 as Base16, Base32, or Base64url, or decode canonical data strictly.
DeveloperQuoted-Printable Converter
Encode UTF-8 text as MIME quoted-printable or decode its byte escapes and soft breaks.
DeveloperIDN and Punycode Converter
Inspect validated internationalized domains in ASCII and Unicode using nontransitional UTS46 processing.
DeveloperMarkdown to Safe HTML
Convert Markdown to an HTML fragment with raw HTML disabled and no mounted preview.
DeveloperHTML to Markdown
Convert simple HTML headings, paragraphs, lists, emphasis, links and code into editable Markdown.
DeveloperMarkdown Table Formatter
Validate and align one simple pipe table while retaining escaped pipes and source cell markup.
DeveloperMarkdown Front Matter Editor
Extract, replace, or remove a leading safe YAML metadata map while preserving the Markdown body.
DeveloperDotenv Inspector
Inspect and normalize environment assignments without expanding or executing values.
DeveloperProtocol Buffers Wire Inspector
Inspect Protocol Buffers tags and raw field values from hexadecimal wire bytes.
DeveloperJWK and PEM Public Key Converter
Convert RSA or P-256 public keys between JWK JSON and SPKI PEM locally.
DeveloperSSH Public Key Inspector
Decode an OpenSSH public key and calculate its standard SHA256 fingerprint.
DeveloperJWT Signature Verifier
Verify a JWT signature against an explicit public JWK and selected claims.
DeveloperTOTP Test Workbench
Calculate reproducible RFC6238 one-time codes from a test seed and timestamp.
DeveloperCron Expression Explorer
List the next scheduled occurrences of a cron expression in a selected timezone.
DeveloperSemantic Version Range Checker
Test versions against npm semantic ranges and sort valid versions.
DeveloperGlob Pattern Tester
Test path strings against a bounded glob pattern in an isolated worker.
DeveloperGitignore Rule Tester
Evaluate ordered gitignore rules against supplied relative paths.
DeveloperURL Pattern Tester
Match URL components and inspect named URLPattern groups without fetching URLs.
DeveloperGraphQL Document Workbench
Parse and print GraphQL operations or schema documents with syntax diagnostics.