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Developer Utilities

JSON, Base64, hash, UUID & more.

143 free tools · browser-local

Popular workflows

Common tasks

  • Format, validate, and copy structured data.
  • Encode, decode, and hash developer values.
  • Generate identifiers and test strings quickly.
  • Convert snippets into implementation-ready formats.

All tools in this category

{ } JSON Formatter Format, validate, and copy readable JSON snippets DevJSONFormatter B64 Base64 Encoder Decoder Encode or decode Base64 text locally DevBase64Encoder 🔗 URL Encoder Decoder Encode and decode URL components safely DevURLEncoder # Hash Generator Generate SHA and MD5 hashes for text snippets DevHashGenerator ID UUID Generator Generate UUIDs and ULIDs for tests or documentation DevUUIDGenerator JWT JWT Decoder Decode JWT header and payload without sending tokens anywhere DevJWTDecoder .* Regex Tester Test regular expressions against sample text locally DevRegexTester ⏰ Cron Parser Explain cron schedules and preview upcoming run times DevCronParser ⇄ CSV JSON Converter Convert CSV to JSON or JSON arrays back to CSV DevCSVJSON TS JSON to TypeScript Generate TypeScript interfaces from JSON samples in your browser DevJSONTypeScript YML YAML JSON Converter Convert YAML to JSON and JSON to YAML for config snippets DevYAMLJSON SQL SQL Formatter Format SELECT, JOIN, INSERT, UPDATE, and DELETE SQL statements DevSQLFormatter HTML HTML Escape and Unescape Escape HTML entities or decode escaped HTML text locally DevHTMLEscape MD Markdown to HTML Convert common Markdown headings, links, emphasis, and lists to HTML DevMarkdownHTML XML XML Formatter Format XML markup with readable indentation in your browser DevXMLFormatter JSON JSON Schema Validator Validate JSON data against required fields and simple JSON Schema rules DevJSONSchema JSON JSON Minifier Minify JSON into compact browser-local output DevJSONMinifier JSON JSON Prettifier Prettify JSON with readable indentation and validation DevJSONPrettifier JSON JSON to Schema Infer a simple JSON Schema from sample JSON data DevJSONSchema DIFF JSON Diff Compare two JSON snippets and list changed paths locally DevJSONDiff URL URL Parser Parse URL components, query parameters, hash, and origin locally DevURLParser UTM UTM URL Builder Build campaign URLs with UTM source, medium, campaign, term, and content fields DevUTMURL HTML HTML Minifier Minify simple HTML markup by removing extra whitespace DevHTMLMinifier CK Cookie Header Parser Parse Cookie request headers into readable JSON DevCookieHeader UA User-Agent Parser Identify browser, engine, operating system, and device hints from a user agent string DevUserAgent CIDR CIDR Calculator Calculate IPv4 network, broadcast, mask, range, and usable host count DevCIDRCalculator IP4 IPv4 Address Converter Convert IPv4 addresses between dotted decimal, integer, hexadecimal, and binary DevIPv4Address IP IP Range to CIDR Convert an IPv4 start and end range into CIDR blocks DevRangeCIDR HMAC HMAC Generator Generate HMAC signatures for text with SHA-256 or SHA-512 in the browser DevHMACGenerator PWD Password Strength Checker Estimate password strength, entropy, and practical improvement hints locally DevPasswordStrength TOK Token Generator Generate random hex, Base64URL, and alphanumeric tokens with browser crypto DevTokenGenerator NID Nanoid Generator Generate short URL-safe IDs for prototypes, tests, and documentation DevNanoidGenerator 0101 Text to Binary Convert text to UTF-8 binary byte groups locally DevTextBinary TXT Binary to Text Decode binary byte groups back into readable UTF-8 text DevBinaryText &; HTML Entities Decoder Encode and decode HTML entities for snippets and content cleanup DevHTMLEntities XML XML to JSON Converter Convert simple XML documents into readable JSON locally DevXMLJSON JSON JSON Sorter Sort JSON object keys recursively for stable diffs and review DevJSONSorter FLAT JSON Flattener Flatten nested JSON into dot-path key value pairs DevJSONFlattener JSON JSON Unflattener Rebuild nested JSON from dot-path key value pairs DevJSONUnflattener ESC JSON String Escape Escape text as a JSON string or unescape JSON string content DevJSONString PATH JSON Path Extractor Extract values from JSON using simple dot paths DevJSONPath NDJ NDJSON to JSON Convert newline-delimited JSON records into a JSON array DevNDJSONJSON QS JSON to Query String Convert flat JSON objects to URL query strings DevJSONQuery QS Query String to JSON Parse URL query strings into readable JSON objects DevQueryString HEX Text to Hex Convert UTF-8 text to hexadecimal byte groups DevTextHex HEX Hex to Text Decode hexadecimal byte groups into UTF-8 text DevHexText ASC Text to ASCII Codes Convert text characters to decimal character codes DevTextASCII ASC ASCII Codes to Text Decode decimal character codes into text DevASCIICodes BASE Number Base Converter Convert numbers between binary, decimal, hexadecimal, and custom bases DevNumberBase CSV CSV to Markdown Table Convert CSV rows into a Markdown table DevCSVMarkdown MD Markdown Table to CSV Convert Markdown tables into CSV text DevMarkdownTable SLUG Slug Generator Generate URL-safe slugs from titles and phrases DevSlugGenerator HTML HTML to Markdown Convert common HTML headings, links, emphasis, and paragraphs to Markdown DevHTMLMarkdown TXT Markdown to Plain Text Strip Markdown syntax into readable plain text DevMarkdownPlain HTML HTML Prettifier Format simple HTML markup with readable line breaks DevHTMLPrettifier CSS CSS Minifier Minify CSS by removing comments and extra whitespace DevCSSMinifier CSS CSS Prettifier Format CSS rules with readable indentation DevCSSPrettifier JS JavaScript Minifier Minify simple JavaScript snippets by removing comments and extra whitespace DevJavaScriptMinifier TBL HTML Table Generator Convert CSV rows into a simple HTML table DevHTMLTable CLR Color Format Converter Convert HEX colors to RGB and HSL values DevColorFormat UNIT CSS Unit Converter Convert px, rem, em, and percent values with a configurable base DevCSSUnit HTTP HTTP Header Parser Parse HTTP header lines into readable JSON DevHTTPHeader CURL cURL to Fetch Convert simple cURL commands into browser fetch snippets DevcURLFetch MAC MAC Address Formatter Format MAC addresses with colon, hyphen, or plain notation DevMACAddress IP6 IPv6 Compressor Compress expanded IPv6 addresses with zero-run shorthand DevIPv6Compressor IP6 IPv6 Expander Expand compressed IPv6 addresses to eight padded groups DevIPv6Expander PORT Port List Parser Expand comma-separated ports and ranges into sorted port lists DevPortList CIDR CIDR Normalizer Normalize IPv4 CIDR blocks to their canonical network address DevCIDRNormalizer AUTH HTTP Basic Auth Generator Generate Basic Authorization header values locally DevHTTPBasic HASH Hash Compare Compare two hashes or strings with normalized whitespace DevHashCompare JWT JWT Generator Generate local HS256 JWTs for development fixtures DevJWTGenerator SHA SHA Checksum Generate SHA-256 checksums for pasted text DevSHAChecksum HEX Random Hex Generator Generate cryptographically random hexadecimal strings DevRandomHex PASS Passphrase Generator Generate memorable random passphrases locally DevPassphraseGenerator TOTP TOTP Secret Generator Generate random Base32 secrets for authenticator app testing DevTOTPSecret UUID UUID Namespace Helper Generate namespace-style UUID fixtures for docs and tests DevUUIDNamespace TIME Date-time Converter Convert ISO dates, Unix timestamps, UTC, and local time values locally DevDatetime DUR Duration Calculator Calculate elapsed time between two date-time values DevDurationCalculator WEEK Week Number Converter Find ISO week numbers and week date ranges for a date DevWeekNumber TZ Timezone Converter Convert a date-time value across common time zones in the browser DevTimezoneConverter ICS iCal Event Generator Generate simple ICS calendar event text from event details DeviCalEvent ICS iCal Parser Parse ICS calendar snippets into readable event fields DeviCalParser DKR Docker Run to Compose Convert simple docker run commands into Docker Compose YAML snippets DevDockerRun DKR Compose to Docker Run Convert simple Docker Compose service snippets into docker run commands DevComposeDocker K8S Compose to Kubernetes Create basic Kubernetes Deployment and Service YAML from simple Compose snippets DevComposeKubernetes ENV Docker Compose to ENV Extract simple Compose environment maps and arrays into KEY=value lines DevDockerCompose DKR Docker Inspect to Run Convert common Docker inspect JSON fields into a best-effort docker run command DevDockerInspect POD Compose to Quadlets Convert simple Compose services into Podman Quadlet .container unit text DevComposeQuadlets POD Docker Run to Quadlets Convert simple docker run commands into Podman Quadlet .container unit text DevDockerRun K8S Docker Run to Kubernetes Create basic Kubernetes Deployment and Service YAML from simple docker run commands DevDockerRun YML Compose Version Converter Normalize legacy Compose version declarations while preserving services DevComposeVersion TRF Traefik Compose Generator Generate a simple Compose service with Traefik router and service labels DevTraefikCompose XML XML Linter Check XML markup for basic well-formedness and parser errors DevXMLLinter XP XPath Tester Run XPath expressions against XML snippets in the browser DevXPathTester XSLT XSLT Tester Apply simple XSLT stylesheets to XML snippets locally DevXSLTTester ULID ULID Generator Generate sortable ULID identifiers for tests and documentation DevULIDGenerator PIN PIN Generator Generate random numeric PIN codes for local test data DevPINGenerator BIP39 BIP39 Mnemonic Generator Generate test-only mnemonic phrases from a small local word list DevBIP39Mnemonic TEL Phone Number Parser Normalize phone numbers and show country hints for common prefixes DevPhoneNumber LUHN Luhn Validator Validate card-like numbers with the Luhn checksum locally DevLuhnValidator IBAN IBAN Validator Validate IBAN checksum and normalize spacing locally DevIBANValidator VAT VAT Number Helper Normalize VAT numbers and show country prefix hints without remote lookup DevVATNumber ISO ISO Country Search Search common ISO country codes, names, and calling prefixes locally DevISOCountry GTIN GTIN Validator Validate GTIN, EAN, UPC, and ISBN-style check digits locally DevGTINValidator SPF SPF Record Parser Parse SPF mechanisms, includes, IP ranges, and policy qualifiers locally DevSPFRecord DMR DMARC Record Parser Parse DMARC policy tags, aggregate report destinations, and alignment settings locally DevDMARCRecord DKIM DKIM Record Parser Parse DKIM selector records, key types, hash algorithms, and public key hints locally DevDKIMRecord DNS DNS Zone File Parser Parse simple zone file records into structured JSON without network access DevDNSZone IDN Punycode Converter Convert internationalized domain labels to ASCII punycode locally DevPunycodeConverter AUT htpasswd Generator Generate development-only Apache htpasswd style entries in the browser DevhtpasswdGenerator BCR Bcrypt Hash Helper Inspect bcrypt hash structure and generate safe development placeholder hashes DevBcryptHash CERT Certificate Parser Inspect PEM certificate blocks, fingerprints, and encoded metadata hints locally DevCertificateParser CSR CSR Inspector Inspect PEM certificate signing request blocks and fingerprints locally DevCSRInspector RSA RSA Key Inspector Inspect PEM public and private key block type, size hints, and fingerprints locally DevRSAKey ENC Text Encryption Helper Create browser-local AES-GCM encrypted text fixtures from passphrases DevTextEncryption DNS DNS Lookup Resolve public DNS records through a rate-limited Fileees network function DevDNSLookup RDAP RDAP WHOIS Lookup Query public RDAP registration data through a guarded network function DevRDAPWHOIS HDR Remote Header Checker Fetch public HTTP headers through a guarded network function with private IP blocking DevRemoteHeader URL Short URL Expander Follow a bounded public redirect chain through a guarded network function DevShortURL TYPE File Type Inspector Inspect magic bytes and common signatures for browser-local file triage DevTypeInspector SUM File Checksum Generate browser-local SHA-256 checksums for pasted forensic snippets DevChecksumGenerate HASH Hash Identifier Identify likely MD5, SHA, NTLM, bcrypt, and other hash formats locally DevHashIdentifier IOC IOC Extractor Extract URLs, domains, IP addresses, hashes, and emails from text locally DevIOCExtractor MAIL Email Header Analyzer Summarize email headers, received hops, sender fields, and authentication hints locally DevEmailHeader FANG URL Defang Refang Defang or refang URLs, domains, and IP indicators for safe sharing DevURLDefang SAFE Safe Links Decoder Decode Microsoft Safe Links and reveal the original URL locally DevSafeLinks SNOW Snowflake ID Parser Decode timestamp hints from Twitter-style Snowflake IDs locally DevSnowflakeParser OID MongoDB ObjectId Parser Decode MongoDB ObjectId timestamps and raw components locally DevMongoDBObjectId MASK Sensitive Data Masker Mask emails, cards, tokens, IPs, and common secrets before sharing logs DevSensitiveData HEX Hex Data Inspector Inspect hex bytes, ASCII previews, and entropy hints for pasted data DevHexData TIME Log Timeline Normalizer Normalize common log timestamps into an ordered browser-local timeline DevLogTimeline ENV ENV to JSON Convert .env lines to JSON locally DevENVJSON ENV JSON to ENV Convert flat JSON objects to .env lines locally DevJSONENV SORT Dotenv Sorter Sort .env lines while preserving comments locally DevDotenvSorter YML YAML Frontmatter Extractor Extract Markdown YAML frontmatter locally DevYAMLFrontmatter GIT Gitignore Generator Generate small .gitignore snippets for common stacks locally DevGitignoreGenerator HTTP HTTP Status Lookup Look up common HTTP status code meanings locally DevHTTPStatus MIME MIME Type Lookup Look up common MIME types and file extensions locally DevMIMEType B64U Base64 URL Converter Convert Base64 and Base64URL strings locally DevBase64URL JOIN URL Joiner Join base URLs and paths without making network requests DevURLJoiner VER Semver Compare Compare semantic versions locally DevSemverCompare CRON Cron Description Helper Describe simple cron expressions locally DevCronDescription .* Regex Escape Helper Escape literal text for regular expressions locally DevRegexEscape

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Format and validate JSON safely Clean API payloads, configs, and logs before sharing them with teammates or tools. Developer data cleanup workflows Clean pasted JSON, CSV, logs, and text snippets before sharing, debugging, or moving data into another tool. YAML vs JSON: when to use each Understand config, API, documentation, and frontmatter workflows without guessing formats. Base64, URL encode, and hash tools explained Use common developer encoders without mixing up encoding, encryption, and hashing.

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