gistfile1.txt

// l10n example based on the https://tools.ietf.org/html/rfc7807 example
{
   "type": "https://example.net/validation-error",
   "title": "Your request parameters didn't validate.",
   "titleKey": "invalid.parameters.key"
   "invalid-params": [ {
                         "name": "age",
                         "reason": "must be a positive integer",
                         "reasonKey": "must.be.positive.integer"
                       },
                       {
                         "name": "color",
                         "reason": "must be 'green', 'red' or 'blue'",
                         "reasonKey": "must.be.primary.color"
                       }
                     ]
}

- In this example "titleKey" is indeed redundant, since "type" could also be used to act as an unique and stable identififier.
- However we also need identifiers (i.e. keys) to the "invalid-params" reasons.