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Developer utilities for timestamps, query strings, APIs, debugging, and web workflows.
Unix Timestamp and Epoch Converter
Convert Unix timestamps and epoch seconds into readable dates, or turn human time back into epoch values for logs, APIs, databases, analytics events, and debugging. It is especially useful when working across backend systems, JavaScript dates, and monitoring tools. ToolMill performs the conversion instantly in your browser so you can inspect time values without exposing internal timestamps to another service.
Development
ISO 8601 Timestamp Validator and Formatter
Validate ISO 8601 timestamps and normalize formatting for APIs, JSON payloads, audit logs, schedules, feeds, and database exports. Use it to catch malformed dates before they break integrations or create timezone confusion. ToolMill runs fully client-side, which makes it convenient for checking production-like values without sending them to another validator service.
Development
URL Query String Parser and Builder
Parse URL query strings into readable key/value data and rebuild them when testing links, tracking parameters, filters, redirects, signed URLs, or app state in the browser. It is useful for debugging marketing URLs, API requests, and web-app routing behavior. ToolMill gives you a quick private workspace in the browser instead of making you paste real customer URLs into a remote tool.
Development