Which JSONPath syntax is supported?

It supports the common subset — the $ root, dot and bracket property access, numeric array indexes, and the [*] wildcard to map over every element of an array or object. It does not support filters or recursive descent.

What does the wildcard do?

A [*] segment expands to every element of the array or every value of the object at that point, so $.items[*].name returns the name from every item. You can chain wildcards across nested arrays.

Why do I get no matches?

Either the path does not exist in your JSON or the syntax is off. Check for a leading $, correct key names, and that array indexes are in range. The tool reports parse errors separately from empty results.

Is my data sent anywhere?

No. Parsing and extraction run entirely in your browser with no network calls, so you can query responses containing sensitive content safely.

How is this useful with LLM output?

LLM API responses bury the useful text deep in nested objects. A path like $.choices[0].message.content pulls out just the answer, and wildcards let you flatten structured outputs into a clean list.

JSONPath Extractor for LLM Output

JSONPath extractor for LLM output

LLM API responses wrap the part you actually want in layers of envelope: choices, message, content, and so on. Clicking through that by hand is tedious. This tool lets you write a JSONPath expression and pull out exactly the values you need, with full wildcard support for flattening arrays — entirely in your browser.

How it works

Paste your JSON and a path expression. The tool parses the JSON, then walks your path segment by segment from the $ root. Property names use dot or bracket notation, array elements use numeric indexes, and a [*] wildcard fans out to every element of an array or every value of an object, so a single path can return many matches. Each match is listed with its resolved value; parse errors and empty result sets are reported distinctly so you know which one you hit.

Tips and notes

Start broad, then narrow. Try $ to confirm the JSON parsed, then add segments until you isolate the value you want.
Wildcards flatten structured output. $.results[*].label turns a list of objects into a clean list of labels you can copy straight out.
Mind array bounds. An index past the end of an array yields no match rather than an error, so an empty result often means the index is too high.
Combine with the schema inferrer. Infer the shape of a response first, then write paths against the keys it reveals.