JSONPath सिंटैक्स चीटशीट

JSONPath is a query language for JSON, the way XPath is for XML. An expression walks the document from the root and returns every value that matches.

ℹ️ Expressions normally start with $, the root element. Some clients let you drop the leading $.. Implementations differ in the details — RFC 9535 standardised the syntax in 2024, but older libraries predate it.

🧭 Syntax

🌳 Tree Traversal

🔢 Array Access

🔎 Filtering

Filters are written [?(...)] — [?...] in RFC 9535 — and keep the elements for which the expression is true.

Combining conditions

🧮 Functions

Available in RFC 9535 and in most modern implementations:

Older Jayway-style implementations instead offer .length(), .min(), .max(), .avg() and .sum() at the end of a path — $.book[*].price.sum().

📄 Worked Example

{
  "store": {
    "book": [
      { "title": "Sayings of the Century", "author": "Nigel Rees", "price": 8.95 },
      { "title": "Moby Dick", "author": "Herman Melville", "price": 8.99 },
      { "title": "The Lord of the Rings", "author": "J. R. R. Tolkien", "price": 22.99 }
    ],
    "bicycle": { "color": "red", "price": 19.95 }
  }
}

🗺 Output Mapping

🧰 Where You’ll Meet It

• kubectl get pods -o jsonpath='{.items[*].metadata.name}'
• Jayway JSONPath in Java, REST Assured assertions
• Karate, Postman and Newman test scripts
• Nginx, Grafana and Prometheus JSON scrapers

💡 For heavier transformation on the command line, jq is usually the better tool — JSONPath selects, jq selects and reshapes.

📚 Resources

• RFC 9535 — JSONPath
• Try expressions online (jsonpath.com)
• Comparison of implementations

Original author: https://gist.github.com/mackoj/5786f8b95da0a82e8e003f444c4295bf