Get Available Objects

Paste the following into the "Execute SOQL Query" method and press run

SELECT QualifiedApiName FROM EntityDefinition order by QualifiedApiName

Paste the resulting json into this box and press submit, your file will be downloaded

Get Fields on an object

Desired Object Name:

Paste the following into the "Execute SOQL Query" method and press run

SELECT EntityDefinition.QualifiedApiName, QualifiedApiName, DataType FROM FieldDefinition WHERE EntityDefinition.QualifiedApiName = ''

Paste the resulting json into this box and press submit, your file will be downloaded