> For the complete documentation index, see [llms.txt](https://emotiv.gitbook.io/emotivpro-v3/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://emotiv.gitbook.io/emotivpro-v3/managing-your-eeg-data-recordings/exporting-an-eeg-data-recording/json-files.md).

# JSON files

If your recording contains keystroke markers, a JSON file will also be exported. This JSON file contains the descriptions of the keystroke markers used and their corresponding values in the EDF and CSV files.

A Baseline JSON file is created when baseline recording is enabled. The baseline markers and their corresponding values are:

* Eyes Opened Start : 1
* Eyes Opened End: 2
* Eyes Closed Start: 3
* Eyes Closed End: 4

![](/files/-Mke1nOOhFccnzk-anF4)

In case of EPOC Flex, a separate JSON file is created that outputs the mapping for channel names and sensor positions for the selected session. For e.g.:

"CMS": "Afz",

"DRL": "FCz",

"LA": "C3",

"LB": "T7",

"LC": "FC1",

"LD": "FC5",

"LE": "FT9",

"LF": "F3",

"LG": "F7",

"LH": "Fp1",

"LJ": "Pz",

"LK": "Cz",

"LL": "O1",

"LM": "TP9",

"LN": "P3",

"LO": "P7",

"LP": "CP1",

"LQ": "CP5",

"RA": "C4",

"RB": "T8",

"RC": "FC2",

"RD": "FC6",

"RE": "FT10",

"RF": "F4",

"RG": "F8",

"RH": "Fp2",

"RJ": "Oz",

"RK": "Fz",

"RL": "O2",

"RM": "TP10",

"RN": "P4",

"RO": "P8",

"RP": "CP2",

"RQ": "CP6"