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### jsoncons::jmespath::jmespath_expression
```cpp
#include <jsoncons_ext/jmespath/jmespath.hpp>
template <typename Json>
class jmespath_expression
```
#### Member types
Type |Definition
---------------------------|------------------------------
char_type |Json::char_type
string_type |std::basic_json<char_type>
#### Member functions
Json evaluate(reference doc) const; (1)
Json evaluate(reference doc,
const std::vector<std::pair<std::string,Json>>& params) const; (until 1.3.1)
(2)
Json evaluate(reference doc,
const std::map<string_type,Json>& params) const; (since 1.3.1)
Json evaluate(reference doc, std::error_code& ec) const; (3)
Json evaluate(reference doc,
const std::vector<std::pair<std::string,Json>>& params, (until 1.3.1)
std::error_code& ec) const;
(4)
Json evaluate(reference doc,
const std::map<string_type,Json>& params, (since 1.3.1)
std::error_code& ec) const;
#### Parameters
<table>
<tr>
<td>doc</td>
<td>Json value</td>
</tr>
<tr>
<td>params</td>
<td>List of parameters to be provided to an initial (global) scope when the query is evaluated</td>
</tr>
<tr>
<td>ec</td>
<td>out-parameter for reporting errors in the non-throwing overload</td>
</tr>
</table>
#### Exceptions
(1),(3) Throws a [jmespath_error](jmespath_error.md) if JMESPath evaluation fails.
(2),(4) Sets the out-parameter `ec` to the [jmespath_error_category](jmespath_errc.md) if JMESPath evaluation fails.
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