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After spending some times, reverse engineering jsFiddle, trying to generate payload - there is an effect.

Please take eye (care) on line return response.json(); where response is not a response - it is promise.

var json = { json: JSON.stringify({ a: 1, b: 2 }), delay: 3 }; fetch('/echo/json/', { method: 'post', headers: { 'Accept': 'application/json, text/plain, */*', 'Content-Type': 'application/json' }, body: 'json=' + encodeURI(JSON.stringify(json.json)) + '&delay=' + json.delay }) .then(function (response) { return response.json(); }) .then(function (result) { alert(result); }) .catch (function (error) { console.log('Request failed', error); }); 

jsFiddle: http://jsfiddle.net/egxt6cpz/46/ && Firefox > 39 && Chrome > 42

After spending some times, reverse engineering jsFiddle, trying to generate payload - there is an effect.

Please take eye (care) on line return response.json(); where response is not a response - it is promise.

var json = { json: JSON.stringify({ a: 1, b: 2 }), delay: 3 }; fetch('/echo/json/', { method: 'post', headers: { 'Accept': 'application/json, text/plain, */*', 'Content-Type': 'application/json' }, body: 'json=' + encodeURIComponent(JSON.stringify(json.json)) + '&delay=' + json.delay }) .then(function (response) { return response.json(); }) .then(function (result) { alert(result); }) .catch (function (error) { console.log('Request failed', error); }); 

jsFiddle: http://jsfiddle.net/egxt6cpz/46/ && Firefox > 39 && Chrome > 42

After spending some times, reverse engineering jsFiddle, trying to generate payload - there is an effect.

Please take eye (care) on line return response.json(); where response is not a response - it is promise.

var json = { json: JSON.stringify({ a: 1, b: 2 }), delay: 3 }; fetch('/echo/json/', { method: 'post', headers: { 'Accept': 'application/json, text/plain, */*', 'Content-Type': 'application/json' }, body: 'json=' + encodeURI(JSON.stringify(json.json)) + '&delay=' + json.delay }) .then(function (response) { return response.json(); }) .then(function (result) { alert(result); }) .catch (function (error) { console.log('Request failed', error); }); 

jsFiddle  : http://jsfiddle.net/egxt6cpz/46/ && Firefox 39 && Chrome 42

After spending some times, reverse engineering jsFiddle, trying to generate payload - there is an effect.

Please take eye (care) on line return response.json(); where response is not a response - it is promise.

var json = { json: JSON.stringify({ a: 1, b: 2 }), delay: 3 }; fetch('/echo/json/', { method: 'post', headers: { 'Accept': 'application/json, text/plain, */*', 'Content-Type': 'application/json' }, body: 'json=' + encodeURI(JSON.stringify(json.json)) + '&delay=' + json.delay }) .then(function (response) { return response.json(); }) .then(function (result) { alert(result); }) .catch (function (error) { console.log('Request failed', error); }); 

jsFiddle: http://jsfiddle.net/egxt6cpz/46/ && Firefox > 39 && Chrome > 42

After spending some times, reverse engenirig jsFiddle, trying to generate payload - there is an effect.

Please take eye (care) on line return response.json(); where response is not a response - it is promise.

var json = { json: JSON.stringify({ a: 1, b: 2 }), delay: 3 }; fetch('/echo/json/', { method: 'post', headers: { 'Accept': 'application/json, text/plain, */*', 'Content-Type': 'application/json' }, body: 'json=' + encodeURI(JSON.stringify(json.json)) + '&delay=' + json.delay }) .then(function (response) { return response.json(); }) .then(function (result) { alert(result); }) .catch (function (error) { console.log('Request failed', error); }); 

jsFiddle: http://jsfiddle.net/egxt6cpz/46/ && Firefox 39 && Chrome 42

After spending some times, reverse engineering jsFiddle, trying to generate payload - there is an effect.

Please take eye (care) on line return response.json(); where response is not a response - it is promise.

var json = { json: JSON.stringify({ a: 1, b: 2 }), delay: 3 }; fetch('/echo/json/', { method: 'post', headers: { 'Accept': 'application/json, text/plain, */*', 'Content-Type': 'application/json' }, body: 'json=' + encodeURI(JSON.stringify(json.json)) + '&delay=' + json.delay }) .then(function (response) { return response.json(); }) .then(function (result) { alert(result); }) .catch (function (error) { console.log('Request failed', error); }); 

jsFiddle  : http://jsfiddle.net/egxt6cpz/46/ && Firefox 39 && Chrome 42