Everything in the catalog

Spins up a mock REST, SOAP or GraphQL endpoint with rules and generated responses, and logs incoming requests.

Web editor for writing code on a CircuitPython board over USB or WiFi.

Builds cron schedules from minute, hour and day fields, with presets and a plain-language reading.

Builds a crontab line from schedule fields, command and output options.

Lists which CSS properties trigger layout, paint or composite work in browser engines.

Helps you pick the right git command by describing the change you want and the repository state.

Compares cloud instance types for a Kubernetes cluster by how much capacity is left for pods.

Fills in Deployment, Service and ConfigMap manifests from a form to produce Kubernetes YAML.

Public inboxes for catching test emails and verification codes during QA.

Assembles or disassembles code for several CPU architectures using Keystone and Capstone.

Converts SQL between database dialects such as Oracle, SQL Server, MySQL and PostgreSQL.

Runs SQL against several database engines online and shares the fiddle by link.

Collection of developer tools built with React, including color conversion, hashing and CSS helpers.

Converts an IP address between dotted, decimal, hex and octal forms.

Computes CRC checksums using many named CRC variants.

Disassembles x86 machine code from hex into assembly.

Finds IPv4 and IPv6 addresses in text.

Decompresses gzip data.

Compresses data using gzip.

Runs jq queries on JSON input.

Strips whitespace from JSON.

Breaks an IPv6 address into its parts and reports its type.

Decodes octal, symbolic or ls-style Unix permissions.

Generates random bytes or numbers from the browser's crypto source.