Everyday utilities for parsing and testing
Some tools don’t fit neatly into a single format family but show up constantly in a developer’s day: figuring out exactly when a cron job will run, making sense of a wall of log output, getting a regular expression right, or pulling a value out of a deeply nested JSON document. This category gathers those general-purpose helpers in one place.
As with everything on djdata.io, these tools run entirely in your browser. The logs you analyze and the JSON you query — which often come straight from production — are processed locally and never transmitted.
Tools in this category
- Cron Expression Parser — Translate a cron schedule into plain language and preview upcoming run times.
- Log Parser — Structure, filter, and explore raw log files.
- Regex Tester — Test regular expressions with real-time match highlighting.
- JSONPath Tester — Evaluate JSONPath expressions against your JSON.
Common use cases
These utilities shorten feedback loops. Instead of deploying a cron change and hoping, you confirm the schedule first; instead of squinting at raw logs, you filter them down to what matters; instead of guessing at a regex, you watch it match (or fail to match) your real input character by character; and instead of writing throwaway code to traverse a JSON tree, you test a JSONPath query interactively. Each tool comes with explanations and examples, so it’s also a fast way to learn the syntax.
Frequently asked questions
Which cron syntax is supported? The standard five-field cron format, including common shortcuts. The tool explains each field and shows the next scheduled runs.
Does the regex tester use my browser’s engine? It evaluates expressions using JavaScript’s regular-expression engine, with live highlighting so you can see matches and capture groups as you type.
Are my logs or JSON sent anywhere? No. All parsing, matching, and querying happens locally in your browser.