JSON to C Array/Struct Converter

Purpose

Use this tool to turn a JSON config or payload into a matching C struct definition and initializer, so you can copy config data straight into firmware without hand-writing the struct.

Main steps

1. 1Paste or type a JSON object into the left panel. The root value must be an object, not an array or a plain value.
2. 2Optionally set the struct type name and variable name used in the generated code.
3. 3The C code on the right updates automatically: a typedef struct definition followed by a designated initializer.
4. 4Nested objects become their own typedef struct, declared above the struct that uses them. Arrays of numbers, strings, booleans, or objects become fixed-size C arrays.
5. 5Check the warnings panel for fields that could not be converted, such as empty or mixed-type arrays, and copy the result once it looks right.