🎯 JSONPath Tester
Test JSONPath expressions against your JSON data instantly.
📋 When to Use the JSONPath Tester
The JSONPath Tester is built for developers who need quick, reliable tools without leaving their workflow. Use it during code reviews, debugging sessions, or when scaffolding new projects. It's ideal for situations where you need a utility fast — pair programming sessions, hackathons, teaching moments, or when working on a machine where you can't install tools. All processing stays in your browser, so your code and data remain private.
⚙️ How the JSONPath Tester Works
The JSONPath Tester processes your input using algorithms implemented in client-side JavaScript. When you paste code, enter parameters, or click action buttons, the tool parses, transforms, or generates output using format-specific logic. It may use Web APIs like the Clipboard API for copy operations or the File API for drag-and-drop support. The tool is stateless — your code and data never leave your browser. For complex operations (parsing, linting, formatting), the logic runs synchronously and updates results in real time.
📖 How to Use the JSONPath Tester
- Paste your JSON — add a valid JSON object or array in the left panel.
- Write a JSONPath expression — use
$.store.book[*].title,$..author, or filter expressions like$..book[?(@.price < 10)]. - Click Evaluate — the matching nodes appear in the right panel with syntax highlighting.
- Copy results — use the Copy button to grab the extracted JSON.
- Iterate — refine your path expression until you extract exactly what you need.
❓ Frequently Asked Questions
What is JSONPath?
JSONPath is a query language for JSON, similar to XPath for XML. It lets you navigate and extract data from nested JSON structures using path expressions like $ (root), . (child), .. (descendant), and [?(...)] (filter).
What's the difference between $.store.book and $..book?
$.store.book only matches the exact path from root to store to book. $..book uses recursive descent to find any "book" key at any nesting level — a shortcut when you don't know the exact structure.
How do filter expressions work?
Filters use [?(@.field operator value)] syntax. Example: $.store.book[?(@.price < 10)] returns all books under $10. Supported operators: ==, !=, <, >, <=, >=, =~ (regex).
What library powers the JSONPath evaluation?
The tester uses JSONPath-Plus (v7.2+), a standards-compliant implementation supporting the full JSONPath specification including filters, slices, and script expressions. All evaluation happens client-side — your data never leaves your browser.