JSON Format

JavaScript^® Object Notation format

JavaScript Object Notation (JSON) is a data interchange format based on the JavaScript programming language. In MATLAB^®, you can decode and encode JSON-formatted text. You can also import data from a JSON file into MATLAB as a structure (since R2023b), dictionary (since R2024b), table (since R2026a), or timetable (since R2026a). You can write the contents of a structure, dictionary, table, or timetable to a JSON file.

Functions

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Read and Write JSON Data

`jsondecode`	Decode JSON-formatted text
`jsonencode`	Create JSON-formatted text from structured MATLAB data
`readstruct`	Create structure array from file
`writestruct`	Write structure array to file
`readdictionary`	Create dictionary from file (Since R2024b)
`writedictionary`	Write dictionary to file (Since R2024b)
`readtable`	Create table from file
`writetable`	Write table to file
`readtimetable`	Create timetable from file
`writetimetable`	Write timetable to file

Define Import Rules

`detectImportOptions`	Create import options based on file content
`jsonImportOptions`	Import options object for JSON files (Since R2026a)
`getvaropts`	Get variable import options
`setvaropts`	Set variable import options
`setvartype`	Set variable data types

Topics

Customize JSON Encoding for MATLAB Classes
Override the jsonencode function for user-defined classes.