JMESPath Evaluator
Runs locally in your browser. Nothing leaves your device.Run JMESPath Core expressions locally against JSON and export the JSON result.
JMESPath settings
JMESPath returns exactly one JSON value, not match positions. Community extensions such as root $, let, arithmetic, or extra functions are blocked.
Input
Output
Paste valid JSON and a JMESPath expression.
How it works
- 1
Paste JSON or open a file
Paste JSON or open a JSON or TXT file up to 100 MB.
- 2
Enter the JMESPath expression
Enter a JMESPath core expression, for example people[?age > `30`].name.
- 3
Export the result
Choose the output format and copy or download the result.
Good to know
The JMESPath evaluator evaluates JMESPath expressions directly in your browser strictly according to the JMESPath core specification and returns exactly one JSON value, not multiple match positions like JSONPath. Community extensions such as root $, let bindings, arithmetic, or extra functions are deliberately blocked.
An expression AST summary shows the query's structure, and the result can be exported as JSON, JSON Lines, CSV, or plain text. Important: JMESPath often returns null when a path doesn't exist — check field names, list projections, and filter conditions accordingly.
Typical use cases
Test an AWS CLI query expression before deployment
Since AWS CLI --query is based on JMESPath, an expression can be checked here against sample data before being used in a script.
Extract a filtered list from a JSON document
Use an expression like people[?age > `30`].name to deliberately extract filtered values from a JSON list.
Tips for better results
Trace null results back to missing paths
If a query returns null, first check field names and list projections instead of assuming an error in the expression itself.
Don't expect community extensions from other libraries
Root $, let bindings, arithmetic, or extra functions from some JMESPath implementations are deliberately blocked here, since they are not part of the core.
Features
Strict core specification
Blocks community extensions like root $, let, or arithmetic for maximum standard compliance.
Four output formats
JSON, JSON Lines, CSV, or plain text for the query result.
Local processing
Your data never leaves your device; evaluation runs entirely in the browser.
Frequently asked questions
Why does my query return null?
JMESPath returns null when a path doesn't exist — check field names, list projections, and filter conditions.
Is my data uploaded?
No. Evaluation runs entirely locally in the browser.
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