Add json output support

source/app/action/index.mjs

@@ -198,7 +198,7 @@
           info.break()
           info.group({metadata, name:"core", inputs:config})
           info("Plugin errors", die ? "(exit with error)" : "(displayed in generated image)")
-          const convert = ["jpeg", "png"].includes(config["config.output"]) ? config["config.output"] : null
+          const convert = ["jpeg", "png", "json"].includes(config["config.output"]) ? config["config.output"] : null
           Object.assign(q, config)
 
         //Base content

source/app/metrics/index.mjs

@@ -53,6 +53,12 @@
               console.warn(util.inspect(errors, {depth:Infinity, maxStringLength:256}))
           }
 
+        //JSON output
+          if (convert === "json") {
+            console.debug(`metrics/compute/${login} > json output`)
+            return {rendered:data, mime:"application/json"}
+          }
+
         //Rendering
           console.debug(`metrics/compute/${login} > render`)
           let rendered = await ejs.render(image, {...data, s:imports.s, f:imports.format, style, fonts}, {views, async:true})

source/app/web/instance.mjs

@@ -189,7 +189,7 @@
                 graphql, rest, plugins, conf,
                 die:q["plugins.errors.fatal"] ?? false,
                 verify:q.verify ?? false,
-                convert:["jpeg", "png"].includes(q["config.output"]) ? q["config.output"] : null,
+                convert:["jpeg", "png", "json"].includes(q["config.output"]) ? q["config.output"] : null,
               }, {Plugins, Templates})
             //Cache
               if ((!debug)&&(cached))