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Category Json Tools

JSON Input

JSONPath Expression

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About

The JSONPath Tester is a specialized development utility designed to evaluate JSONPath expressions against JSON datasets. Similar to how XPath works for XML, JSONPath provides a standardized syntax to select specific parts of a JSON structure. This tool is essential for backend developers, data engineers, and QA testers who need to verify their extraction logic before implementing it in code.

Whether you are debugging complex API responses, scraping web data, or configuring data pipelines, this tool isolates the querying logic. It allows you to visualize exactly what data your path expression targets, handling nested arrays, object keys, and wildcards efficiently.

Formulas

The evaluation logic follows a sequential traversal algorithm based on the JSONPath specification. The process parses the input string and navigates the object tree accordingly.

Step 1. Root Identification: The engine validates the starting $ symbol to confirm the anchor point is the root object.
Step 2. Tokenization: The path string is split into executable tokens (e.g., property names, array indices, or wildcards) using regex pattern matching.
Step 3. Traversal: The algorithm iterates through the JSON structure. For every token, it attempts to access the corresponding key or index in the current data context.
Step 4. Collection: If a wildcard * or slice is encountered, the engine collects all matching nodes into an array result.

This strict step-by-step verification ensures that the output matches the exact structure defined by your query syntax.

Reference Data

Symbol	Description	Example
`$`	The root object/element	`$`
`.`	Child operator (dot notation)	`$.store`
`[]`	Child operator (bracket notation)	`$['store']`
`*`	Wildcard (all members/indexes)	`$.store.*`
`[n]`	Array index (starts at 0)	`$.books[0]`
`[start:end]`	Array slice operator	`$.books[0:2]`

Frequently Asked Questions

This usually happens if a key in your path does not exist in the JSON structure, or if there is a typo in the property name. Remember that JSON keys are case-sensitive. Additionally, verify if you are trying to access a property on an array without specifying an index.

Yes, but you must use bracket notation instead of dot notation. For example, use $['user name'] instead of $.user name. Single quotes or double quotes are required within the brackets.

For security and performance reasons, this client-side tool focuses on structure navigation (dot, bracket, wildcard, and slice operators). It does not execute arbitrary JavaScript code inside filter expressions like [?(@.price < 10)].

When you use a wildcard (*) or an array slice, the result is typically returned as a list (array) of matches, even if only one item is found. If you target a single specific key, the result is the direct value of that key.