Restrict to send JSON request as string (object expected)

[vladdnepr]

Q	A
Bug fix?	yes
New feature?	no
BC breaks?	no
Deprecations?	no
Tests pass?	yes
Documented?	no
Fixed tickets
License	MIT

Return value of getParsedBody must be array. But passed string will cause TypeError

Example

fetch("ENDPOINT", {
  "headers": {
    "content-type": "application/json",
  },
  "body": "111",
  "method": "POST"
});

[mcg-web]

Thank you @vladdnepr, can you add a test covering this case please ?