JSONBaseline · Widely available
The JSON API provides static methods for parsing values from and converting values to JavaScript Object Notation (JSON), a serialization format for objects, arrays, numbers, strings, Boolean values, and null.
Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Jul 29, 2015. Widely available since Jan 29, 2018.
Browser support
DesktopChrome
1–2Not supported
3+Supportedsince Sep 15, 2009
Current: 155Edge
12+Supportedsince Jul 29, 2015
Current: 154Firefox
1–3Not supported
3.5+Supportedsince Jun 30, 2009
Current: 157Safari
1–3.1Not supported
4+Supportedsince Jun 8, 2009
Current: 27MobileChrome Android
18+Supportedsince Jun 27, 2012
Current: 155Firefox Android
4+Supportedsince Mar 29, 2011
Current: 157Safari iOS
1–3.2Not supported
4+Supportedsince Jun 21, 2010
Current: 27How to use
This feature is Baseline widely available — use it freely, no fallback needed.
Example
Full syntax and examples are on MDN: JSON.
Feature detection
JS · check before using
if (typeof JSON !== "undefined") {
// JSON is available
}Documentation (MDN)
Specification
Sub-features
Support for each part of the feature (5). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| JSON | 3 | 12 | 3.5 | 4 | 18 | 4 | 4 |
| JSON.json_superset | 66 | 79 | 62 | 12 | 66 | 62 | 12 |
| JSON.parse | 3 | 12 | 3.5 | 4 | 18 | 4 | 4 |
| JSON.stringify | 3 | 12 | 3.5 | 4 | 18 | 4 | 4 |
| JSON.stringify.well_formed_stringify | 72 | 79 | 64 | 12.1 | 72 | 64 | 12.2 |