Developer tools

Practical utilities for everyday software development.

281 ready-to-use tools

Developer tools

18 tools

Mermaid Diagram EditorEdit flowcharts and sequence diagrams with live preview and SVG or PNG export.

Unix Timestamp ConverterConvert Unix timestamps in seconds or milliseconds to dates, or convert a local date and time back to a timestamp.

UUID Generator and SHA Hash CalculatorGenerate UUIDs in batches or calculate SHA-256, SHA-384, and SHA-512 text digests locally in your browser.

JavaScript Regex TesterTest JavaScript regular expressions against text, highlight matches, and inspect match positions and capture groups.

SQL FormatterFormat SQL queries with a selected database dialect, indentation, and keyword style. No database connection is required.

Cron Expression HelperExplain five-field Cron expressions and preview the next run times in a selected time zone. No jobs are scheduled.

cURL ParserParse a cURL command into structured HTTP request data.

cURL Code GeneratorConvert cURL into Fetch, Axios, Go, Python, or raw HTTP code.

JSON DiffCompare two JSON values and generate an RFC 6902 Patch.

JSON Patch ApplierValidate and apply an RFC 6902 Patch to JSON.

JSON Schema GeneratorInfer a Draft 2020-12 JSON Schema from a JSON sample.

OpenAPI ValidatorParse and validate an OpenAPI document in JSON or YAML.

OpenAPI Example GeneratorGenerate JSON request examples from OpenAPI schemas.

JWK / PEM Key ConverterConvert keys between JWK and standard public or private PEM formats.

X.509 Certificate ViewerInspect X.509 certificate subjects, issuers, validity, and fingerprints.

SSH Public Key FingerprintCalculate the SHA-256 fingerprint of an OpenSSH public key.

Webhook Signature GeneratorGenerate GitHub, Stripe, or Shopify-style HMAC signatures.

Token EntropyEstimate a token's character pool, theoretical entropy, and repetition.