Key	Type	Description
options.keys	list<string>	Lists all possible option keys, see Options
options.possible_values(string key)	string	Lists possible values for a given option
options.get(string key)	object	Returns the current value of the option
options.set(string key, object value)	null	Sets the option to the value
options.toggle(string key)	object	Cycles the option to their next value, not supported for options which contain a string value

Possible options keys together with their possible values:

Key	Possible values
fov	30 - 110; step = 1
mipmapLevels	0 - 4; step = 1
renderDistance	2 - 16; step = 1
chat.width	0.0 - 1.0; step = 0.0
chat.height.focused	0.0 - 1.0; step = 0.0
chat.height.unfocused	0.0 - 1.0; step = 0.0
chat.opacity	0.0 - 1.0; step = 0.0
chat.scale	0.0 - 1.0; step = 0.0
framerateLimit	10.0 - 260.0; step = 10.0
mouseWheelSensitivity	0.01 - 10.0; step = 0.009999999776482582
sensitivity	0.0 - 1.0; step = 0.0
accessibility.text_background_opacity	0.0 - 1.0; step = 0.0
gamma	0.0 - 1.0; step = 0.0
autoJump	true, false
autoSuggestCommands	true, false
chat.color	true, false
chat.links	true, false
chat.links.prompt	true, false
discrete_mouse_scroll	true, false
vsync	true, false
entityShadows	true, false
forceUnicodeFont	true, false
realmsNotifications	true, false
reducedDebugInfo	true, false
showSubtitles	true, false
snooper	true, false
touchscreen	true, false
fullscreen	true, false
viewBobbing	true, false
rawMouseInput	true, false
invertMouse	true, false
ao	OFF, MIN, MAX
attackIndicator	OFF, CROSSHAIR, HOTBAR
chat.visibility	FULL, SYSTEM, HIDDEN
mainHand	LEFT, RIGHT
narrator	OFF, ALL, CHAT, SYSTEM
particles	ALL, DECREASED, MINIMAL
renderClouds	OFF, FAST, FANCY
tutorialStep	MOVEMENT, FIND_TREE, PUNCH_TREE, OPEN_INVENTORY, CRAFT_PLANKS, NONE
graphics	true, false
accessibility.text_background	true, false
toggleCrouch	true, false
toggleSprint	true, false
hideServerAddress	true, false
advancedItemTooltips	true, false
pauseOnLostFocus	true, false
heldItemTooltips	true, false
skipMultiplayerWarning	true, false
guiScale	0 - 2; step = 1
lastServer
lang	af_za, ar_sa, ast_es, az_az, ba_ru, bar, be_by, bg_bg, br_fr, brb, bs_ba, ca_es, cs_cz, cy_gb, da_dk, de_at, de_ch, de_de, el_gr, en_au, en_ca, en_gb, en_nz, en_pt, en_ud, en_us, enp, enws, eo_uy, es_ar, es_cl, es_es, es_mx, es_uy, es_ve, et_ee, eu_es, fa_ir, fi_fi, fil_ph, fo_fo, fr_ca, fr_fr, fra_de, fy_nl, ga_ie, gd_gb, gl_es, got_de, gv_im, haw_us, he_il, hi_in, hr_hr, hu_hu, hy_am, id_id, ig_ng, io_en, is_is, it_it, ja_jp, jbo_en, ka_ge, kab_kab, kk_kz, kn_in, ko_kr, ksh, kw_gb, la_la, lb_lu, li_li, lol_us, lt_lt, lv_lv, mi_nz, mk_mk, mn_mn, moh_ca, ms_my, mt_mt, nds_de, nl_be, nl_nl, nn_no, no_no, nuk, oc_fr, oj_ca, ovd, pl_pl, pt_br, pt_pt, qya_aa, ro_ro, ru_ru, scn, se_no, sk_sk, sl_si, so_so, sq_al, sr_sp, sv_se, swg, sxu, szl, ta_in, th_th, tlh_aa, tr_tr, tt_ru, tzl_tzl, uk_ua, val_es, vec_it, vi_vn, yi_de, yo_ng, zh_cn, zh_tw