JSON Object validation in JavaScript

Question

I am using JSON object as an input in the textfield. Is there any way to validate this JSON object in JavaScript??

Are you trying to validate that it's syntactically valid JSON or that it conforms to a certain schema? — jabclab
– jabclab, Commented Dec 8, 2011 at 13:13
I am just trying to check whether the object entered in textfield is valid JSON. — user1059229
– user1059229, Commented Dec 8, 2011 at 13:17
you can use intval function for example $id=intval($id); echo json_encode($data) — rashidkaif1
– rashidkaif1, Commented Dec 26, 2012 at 12:54

jabclab · Accepted Answer · 2011-12-08 13:32:31Z

28

Building on the idea of @Quentin, you can just do something like:

function isValidJson(json) { try { JSON.parse(json); return true; } catch (e) { return false; } } console.log(isValidJson("{}")); // true console.log(isValidJson("abc")); // false

This will require json2.js to be deployed in the page in order to ensure cross-browser support for the JSON Object.

answered Dec 8, 2011 at 13:32

jabclab

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10 Comments

user1059229 Over a year ago

Thanks for replying. But I am getting an error for valid JSON object also.

user1059229 Over a year ago

{ "id":"b9c8e5f2-50ae-102c-8da0-dv8gb9f250ae", "at":2, "tmax":100, "imp": [ { "impid":"dv8gb9f2-50ae-102c-8da0-12313a002cd2", "h":50, "w":320, "instl":0 } ], "app": { "aid":"73737", "name":"We Rule", "ver":"2.1.3" }, "device": { "dpid":"dfe9f2bdfe9f2bdfe9f2bdfe9f2bdfe9f2bdfe9f2b", "ip":"124.32.53.1", "ua":"Mozilla%2F5.0%20(iPhone%3B%20U%3B%20CPU%20iPhone" } }

jabclab Over a year ago

It appears to work for me, have a look at this jsFiddle.

user1059229 Over a year ago

I am using this function on "onsubmit". Should this be a problem??

jabclab Over a year ago

Shouldn't be. Is it possible to set up a jsFiddle to demonstrate the scenario in which the code is failing?

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Mark Homans · Accepted Answer · 2013-01-25 00:04:34Z

3

if you wish to validate the object to a certain schema, you could try JSD Validator

answered Jan 25, 2013 at 0:04

Mark Homans

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Comments

Quentin · Accepted Answer · 2011-12-08 13:05:32Z

Run it through a JSON parser (json2.js if you aren't using a library with one built in) and see if you get data back.

WarFox · Accepted Answer · 2011-12-08 13:19:01Z

Yes, there are quite a few JSON libraries available for your use.

Try these out when using Java:

Jackson - A High performance JSON processors
google-gson - Java library by google

Or if you prefer simple JavaScript, you can go with

David Walsh has given a full example of how to do this in javascript using Mootools, JSON Schema, in the following blog http://davidwalsh.name/json-validation. Give it a go.

Anusha Bhat · Accepted Answer · 2020-06-12 17:49:36Z

Here is the code that worked for me,

$scope.jsonFunc = function(json){ try { $scope.jsonData = JSON.stringify(JSON.parse(json), null, 2); return true; $scope.errorMessage = "Valid JSON"; } catch (e) { $scope.errorMessage = e.message; return false; } }

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