How do I edit embed and add new fields? - discord

Question

There is an Embed in which fields will be added and information will change, depending on the reactions.
How do I make changes to embed and add and remove fields?
If I try to edit via edit, it changes the entire message and inserts only the modified message
const exampleEmbed = new Discord.MessageEmbed()
.setColor('RANDOM')
.setTitle(`${day.format("DD.MM.YY, в (HH:mm)")}`)
.setAuthor('Destiny 2', 'https://www.neira.app/img/Destiny2.png', 'https://www.bungie.net/')
.setDescription(`**Заметка от лидера:** ${c.join(' ')}`)
.setThumbnail(image_raid)
.addField('Информация', `- Лидер группы: **#1** ${message.author}\n- Нажмите на реакцию`)
.setFooter(`ID: ${message.id}`)
let jsonStr = messageReaction.message.embeds[0];
var obj = JSON.parse(JSON.stringify(jsonStr));
obj['fields'].push(
{
"value": "4",
"name":"pending",
"inline":false
});
jsonStr = JSON.stringify(obj);
messageReaction.message.edit("#here", { embed: jsonStr });

Answer 1

You should simply use, in your add reaction code:
const newEmbed = messageReaction.message.embeds[0];
newEmbed.addField('pending', 4, false);
messageReaction.message.edit("#here", {
embed: oldEmbed
});

Answer 2

What you're looking for is the #addField() method. To add new fields externally, simply do <embedName>.addField()
Here is an example of how embeds work:
// at the top of your file
const Discord = require('discord.js');
// inside a command, event listener, etc.
const exampleEmbed = new Discord.MessageEmbed()
.setColor('#0099ff')
.setTitle('Some title')
.setURL('https://discord.js.org/')
.setAuthor('Some name', 'https://i.imgur.com/wSTFkRM.png', 'https://discord.js.org')
.setDescription('Some description here')
.setThumbnail('https://i.imgur.com/wSTFkRM.png')
.addFields(
{ name: 'Regular field title', value: 'Some value here' },
{ name: '\u200B', value: '\u200B' },
{ name: 'Inline field title', value: 'Some value here', inline: true },
{ name: 'Inline field title', value: 'Some value here', inline: true },
)
.addField('Inline field title', 'Some value here', true)
.setImage('https://i.imgur.com/wSTFkRM.png')
.setTimestamp()
.setFooter('Some footer text here', 'https://i.imgur.com/wSTFkRM.png');
channel.send(exampleEmbed);