Developer Tools
Debug APIs, clean content, format data, and run release checks directly in your browser.
A toolkit for developers and ops engineers covering API troubleshooting, JSON/XML data, SEO release checks, regex and strings, SQL and database, auth security, and daily DevOps. Each tool ships with examples and decision notes.
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Tool shortcuts
JSON Formatter
Format, validate, auto-fix & inspect JSON paths
JSON & Data
Timestamp Converter
Convert signed Unix seconds or milliseconds and strict ISO dates
Automation & DevOps
HTML Entity Encoder & Decoder
Encode five special characters or decode HTML entities one layer
Regex & String
Number Base Converter
Convert between binary, octal, decimal & hex
Web Frontend
JWT Decoder
Read JWT claims and time fields without signature verification
Security & Auth
Regex Tester
Test JavaScript regex matches and inspect indices
Regex & String
Crontab Generator
Build numeric five-field cron expressions
Automation & DevOps
chmod Calculator
Convert chmod numeric and symbolic permissions
Automation & DevOps
IPv4 Subnet Calculator
Calculate subnet, hosts, CIDR and binary details
Web Frontend
SQL Formatter
Format and beautify SQL queries instantly
SQL & Database
HMAC Generator
Generate HMAC-SHA1, SHA256, SHA512 online
Security & Auth
Token Generator
Generate secure random tokens online
Security & Auth
URL Parser
Inspect URL structure and raw query fields
JSON & Data
XML Formatter
Serialize XML 1.0 with preserved text, namespaces and optional layout changes
JSON & Data
JSON to TypeScript
Generate TypeScript interfaces from JSON
JSON & Data
HTTP Status Codes
Search common HTTP status codes
API & HTTP
MIME Type List & Content-Type Reference
Look up reference MIME values by extension or media type
API & HTTP
JSON Minifier
Minify JSON, escape Unicode, and compare UTF-8 bytes
JSON & Data
HTML Minifier
Minify HTML and remove unnecessary bytes
Web Frontend
CSS Minifier
Clean CSS comments and redundant whitespace
Web Frontend
cURL to Fetch
Convert cURL commands to JavaScript fetch
API & HTTP
SQL Minifier
Clean SQL comments and redundant whitespace
SQL & Database
User-Agent Parser
Parse browser, OS, device from UA string
API & HTTP
HTTP Headers Parser (Raw Headers to JSON)
Inspect request or response text while preserving repeated header fields and their order
API & HTTP
JSON Schema Validator
Validate JSON data against JSON Schema
Validation
JSON Diff
Compare two JSON objects with path-level changes
JSON & Data
Query String Parser
Convert query strings and JSON objects both ways
JSON & Data
UTM Builder
Build tracked URLs with UTM parameters
SEO & Schema
Meta Tag Generator
Generate SEO and Open Graph meta tags
SEO & Schema
Robots.txt Generator
Generate robots.txt rules for crawlers
SEO & Schema
Sitemap Generator
Generate sitemap.xml from URL lists
SEO & Schema
SemVer Tools
Compare versions and suggest bumps
Automation & DevOps
CSP Generator
Generate Content Security Policy headers
Security & Auth
Regex Replacer
Find and replace text using regular expressions
Regex & String
HTTP Header Generator
Generate HTTP request header blocks
API & HTTP
Redirect Rule Generator
Generate Nginx and Apache redirect rules
SEO & Schema
Gitignore Generator
Generate .gitignore from common templates
Automation & DevOps
Email Header Parser
Parse raw email headers into structured fields
API & HTTP
Changelog Generator
Generate structured changelog entries
Automation & DevOps
FAQ Schema Generator
Generate FAQPage JSON-LD structured data
SEO & Schema
Breadcrumb Schema Generator
Create BreadcrumbList JSON-LD markup
SEO & Schema
Organization Schema Generator
Generate Organization JSON-LD markup
SEO & Schema
Hreflang Generator
Generate hreflang alternate link tags
SEO & Schema
Meta Robots Generator
Generate robots meta tag directives
SEO & Schema
UUID Validator
Validate UUID format/version in bulk for API payload and DB QA
Validation
Email Validator
Validate email address format
Validation
SRI Hash Generator
Generate SRI values from UTF-8 resource text
Security & Auth
IBAN Validator
Check IBAN structure, checksum and duplicate line positions
Validation
Credit Card Validator
Validate card number with Luhn check
Validation
Regex Escape
Escape and unescape regex special chars
Regex & String
JSON Key Extractor
Extract key paths from JSON
JSON & Data
URL Canonicalizer
Compare URLs using a fixed normalization rule
SEO & Schema
CSS Specificity Calculator
Calculate selector specificity score
Web Frontend
JSON Sorter
Sort JSON keys recursively
JSON & Data
JSON Flatten / Unflatten
Flatten and restore JSON with typed object and array paths
JSON & Data
Cron Parser
Preview five-field numeric Cron with timezone and date anchor
Automation & DevOps
JSON Path Extractor
Query a documented JSONPath subset with typed results
JSON & Data
XPath Tester
Query XML with XPath 1.0, namespace bindings and complete typed results
JSON & Data
Snowflake ID Parser
Decode and generate Snowflake IDs
Validation
ULID Parser
Parse ULID timestamp and randomness
Validation
CSV Column Extractor
Select CSV columns in an explicit order while retaining exact text and blank records
JSON & Data
HTTPie to cURL Converter
Convert a supported HTTPie command into a POSIX cURL snippet
API & HTTP
Sitemap Validator
Inspect one sitemap XML file and its core fields
SEO & Schema
Meta Tag Analyzer
Inspect HTML metadata values, duplicates and robots conflicts
SEO & Schema
SQL Insert Generator
Generate MySQL, PostgreSQL or SQLite INSERT from CSV
SQL & Database
JSON FormData Converter
Convert nested JSON to FormData fields
JSON & Data
HTTP Request Builder
Build cURL and browser-compatible Fetch snippets from request fields
API & HTTP
Robots.txt Validator
Lint Google-supported directives with source line numbers
SEO & Schema
Basic Auth Generator
Build an HTTP Basic header from UTF-8 credentials
Security & Auth
JSON Line Counter
Count physical JSONL rows and inspect syntax and UTF-8 sizes
JSON & Data
URL Query Cleaner
Batch-remove tracking fields with cleanup options
SEO & Schema
Content-Type Parser (MIME, Charset, Boundary)
Parse Content-Type headers and extract MIME parameters
API & HTTP
Content-Type Generator (MIME Header Builder)
Build Content-Type values with optional charset and quoted parameters
API & HTTP
Data URL Parser
Inspect a data: declaration, decoded byte count, and UTF-8 text preview
API & HTTP
Set-Cookie Parser
Inspect response cookie pairs, ordered attributes, empty values and syntax diagnostics
API & HTTP
Cache-Control Parser
Parse cache directives and compare browser and shared-cache freshness
API & HTTP
CORS Header Generator
Generate static CORS response headers and check supplied preflight parameters
API & HTTP
Microsoft Safe Links Decoder
Reveal the original destination wrapped by Outlook and Microsoft 365 Safe Links
Security & Auth
HAR File Viewer and Analyzer
Inspect HAR requests, separate body/content sizes and supported cURL snippets
API & HTTP
Basic Auth Decoder
Decode Basic credentials with an explicit UTF-8 interpretation
Security & Auth
Proofpoint URL Decoder
Reveal original destinations wrapped by Proofpoint URL Defense v2 and v3
Security & Auth
JSON to SQL Converter
Generate typed MySQL, PostgreSQL or SQLite SQL from JSON
SQL & Database
OAuth PKCE Generator
Generate RFC 7636 verifier, S256 challenge and authorization parameters
Security & Auth
AWS Presigned URL Inspector
Inspect SigV4 credential scope, signed headers and expiration without requesting the URL
Security & Auth
SAML Decoder
Decode SAML requests and responses from Base64 or HTTP-Redirect payloads
Security & Auth
X.509 Certificate Decoder
Inspect PEM or DER certificate identity, SANs, validity, usage, and fingerprint
Security & Auth
JSON Schema Generator
Infer a reviewed starter schema from strict JSON samples
JSON & Data
CSR Decoder
Decode PKCS#10 CSR subject, SANs, public key, signature, and fingerprints
Security & Auth
PEM to JWK Converter
Convert RSA or EC SPKI public keys between PEM and JWK with an RFC 7638 thumbprint
Security & Auth
SSH Key Fingerprint
Calculate SHA256 and legacy MD5 fingerprints from an OpenSSH public key
Security & Auth
AWS ARN Parser
Parse AWS ARN partition, service, region, account, resource type, ID, and qualifier
Automation & DevOps
JSON Escape & Unescape
Escape text and decode JSON string layers with explicit stopping rules
JSON & Data
JSON to Go Struct
Infer nested Go structs, JSON tags, slices, pointers, and optional fields from samples
JSON & Data
JSON to Java Class
Generate Java records or POJO classes with nested models and optional Jackson annotations
JSON & Data
JSON to Rust Struct
Generate nested Rust structs with Serde derives, rename attributes, Vec, and Option fields
JSON & Data
JSON to Kotlin Data Class
Generate nested Kotlin data classes with nullable defaults and kotlinx or Jackson annotations
JSON & Data
GraphQL Formatter
Parse, format, or minify GraphQL operations and summarize variables and fragments
API & HTTP
File Type Detector
Compare file magic bytes, filename extension, browser MIME, and text-content hints locally
Validation
JSON to C# Class Generator
Infer C# records or classes with nested models, nullable types, and JSON serializer attributes
JSON & Data
Cookie Header Parser
Read ordered request-cookie pairs, preserve duplicates and optionally decode percent escapes
API & HTTP
Content-Disposition Parser & Generator
Inspect ordered filename parameters or generate an ASCII fallback with UTF-8 filename*
API & HTTP
CSP Header Analyzer
Parse an existing Content-Security-Policy and flag wildcard, unsafe, insecure, duplicate, and missing controls
Security & Auth
Redirect Map Validator
Inspect exact redirect CSV maps while preserving every original column and row
SEO & Schema
OpenAPI Validator
Check OpenAPI 3.0/3.1 YAML/JSON syntax and selected local structure
API Document Validation
Docker Compose Validator
Inspect selected Compose YAML structures, dependencies and resource references
Docker Compose Configuration