# Message debug function node

**URL:** https://discourse.nodered.org/t/message-debug-function-node/53261
**Category:** Share Your Projects
**Created:** [5 November 2021 12:25 UTC](https://discourse.nodered.org/t/message-debug-function-node/53261 "2021-11-05T12:25:53Z")
**Posts on this page:** 8
**Page:** 1

<div class="post-metadata">

### Author: ![ozpos](https://avatars.discourse-cdn.com/v4/letter/o/278dde/32.png) [@ozpos](https://discourse.nodered.org/u/ozpos)
#### Post date: [5 November 2021 12:25 UTC](https://discourse.nodered.org/t/message-debug-function-node/53261/1 "2021-11-05T12:25:53Z")

</div>

Hi All,

I got into a spot of bother with message timing and fatal lock up so I created this function node to pause, skip, play next, play last, dump and run any message with a topic.

Messages are saved to context variable queues and can be inspected at your leisure.

I hope you find it as useful as I have.

P.S. Could anyone please explain or show when 'node.done()' should be used ?  
I have read the docs but it is still not clear to me when it should be used. In particular the case where msg loops perform count up/down functions.

```auto
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msg.topic;\n context.set(node.name, q);\n while (q.que.length>0){\n q.last = q.que.shift();\n node.send(q.last);\n context.set(node.name, q);\n }\n showStatus(\"green\");\n break;\n\n default:\n // msg\n if (q.status === \"_DUMP_\") {\n q.last = msg;\n showStatus(\"yellow\");\n break;\n }\n if (q.status === \"_PAUSE_\"){\n q.last = msg;\n if (q.que.length > MAX_Q_LEN) {\n showStatus(\"red\");\n break;\n }\n q.que.push(msg);\n showStatus(\"yellow\");\n break;\n }\n while (q.que.length>0){\n q.last = q.que.shift();\n node.send(q.last);\n context.set(node.name, q);\n }\n q.last = msg;\n showStatus(\"green\");\n context.set(node.name,q);\n node.done();\n return msg;\n}\ncontext.set(node.name,q);\nnode.done();\nreturn;\n\nfunction showStatus(colour){\n node.status({fill:colour,shape:\"ring\",text:topics(colour)});\n}\nfunction topics(colour){\n let s = q.status+(colour===\"red\" ? \"Overflow\": \"\")+\"(\"+(Object.keys(q.last).length>0 ? q.last.topic : \"\")+\")\";\n for (let i=0;i<q.que.length;i++) {\n s = s + q.que[i].topic + ((i===q.que.length-1) ? \"\":\",\");\n }\n return s;\n}","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":515,"y":220,"wires":[["db81c15965a84b21"]],"l":false},{"id":"3e018a9f22cef19e","type":"function","z":"a68c78a260d393d4","name":"in1-history","func":"const MAX_Q_LEN = 100;\n\nvar q = context.get(node.name) || {status: \"_PAUSE_\", last: {}, que:[]};\ncontext.set(node.name, q);\n\nswitch(msg.topic) {\n case \"_LAST_\":\n if (Object.keys(q.last) === 0) return;\n return q.last;\n\n case \"_DUMP_\":\n q.status = msg.topic;\n context.set(node.name, q);\n while (q.que.length>0){\n q.last = q.que.shift();\n }\n showStatus(\"yellow\");\n break;\n\n case \"_NEXT_\":\n if (q.status !== \"_PAUSE_\" || q.que.length === 0) return;\n node.send(q.que.shift());\n showStatus(\"yellow\");\n break;\n \n case \"_SKIP_\":\n if (q.status !== \"_PAUSE_\" || q.que.length === 0) return;\n q.que.shift();\n showStatus(\"yellow\");\n break;\n\n case \"_PAUSE_\":\n q.status = msg.topic;\n context.set(node.name, q);\n showStatus(\"yellow\");\n break;\n\n case \"_RUN_\":\n q.status = msg.topic;\n context.set(node.name, q);\n while (q.que.length>0){\n q.last = q.que.shift();\n node.send(q.last);\n context.set(node.name, q);\n }\n showStatus(\"green\");\n break;\n\n default:\n // msg\n if (q.status === \"_DUMP_\") {\n q.last = msg;\n showStatus(\"yellow\");\n break;\n }\n if (q.status === \"_PAUSE_\"){\n q.last = msg;\n if (q.que.length > MAX_Q_LEN) {\n showStatus(\"red\");\n break;\n }\n q.que.push(msg);\n showStatus(\"yellow\");\n break;\n }\n while (q.que.length>0){\n q.last = q.que.shift();\n node.send(q.last);\n context.set(node.name, q);\n }\n q.last = msg;\n showStatus(\"green\");\n context.set(node.name,q);\n node.done();\n return msg;\n}\ncontext.set(node.name,q);\nnode.done();\nreturn;\n\nfunction showStatus(colour){\n node.status({fill:colour,shape:\"ring\",text:topics(colour)});\n}\nfunction topics(colour){\n let s = q.status+(colour===\"red\" ? \"Overflow\": \"\")+\"(\"+(Object.keys(q.last).length>0 ? q.last.topic : \"\")+\")\";\n for (let i=0;i<q.que.length;i++) {\n s = s + q.que[i].topic + ((i===q.que.length-1) ? \"\":\",\");\n }\n return s;\n}","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":515,"y":340,"wires":[[]],"l":false},{"id":"dee682a3b7242146","type":"function","z":"a68c78a260d393d4","name":"out1","func":"const MAX_Q_LEN = 100;\n\nvar q = context.get(node.name) || {status: \"_PAUSE_\", last: {}, que:[]};\ncontext.set(node.name, q);\n\nswitch(msg.topic) {\n case \"_LAST_\":\n if (Object.keys(q.last) === 0) return;\n return q.last;\n\n case \"_DUMP_\":\n q.status = msg.topic;\n context.set(node.name, q);\n while (q.que.length>0){\n q.last = q.que.shift();\n }\n showStatus(\"yellow\");\n break;\n\n case \"_NEXT_\":\n if (q.status !== \"_PAUSE_\" || q.que.length === 0) return;\n node.send(q.que.shift());\n showStatus(\"yellow\");\n break;\n \n 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MAX_Q_LEN = 100;\n\nvar q = context.get(node.name) || {status: \"_PAUSE_\", last: {}, que:[]};\ncontext.set(node.name, q);\n\nswitch(msg.topic) {\n case \"_LAST_\":\n if (Object.keys(q.last) === 0) return;\n return q.last;\n\n case \"_DUMP_\":\n q.status = msg.topic;\n context.set(node.name, q);\n while (q.que.length>0){\n q.last = q.que.shift();\n }\n showStatus(\"yellow\");\n break;\n\n case \"_NEXT_\":\n if (q.status !== \"_PAUSE_\" || q.que.length === 0) return;\n node.send(q.que.shift());\n showStatus(\"yellow\");\n break;\n \n case \"_SKIP_\":\n if (q.status !== \"_PAUSE_\" || q.que.length === 0) return;\n q.que.shift();\n showStatus(\"yellow\");\n break;\n\n case \"_PAUSE_\":\n q.status = msg.topic;\n context.set(node.name, q);\n showStatus(\"yellow\");\n break;\n\n case \"_RUN_\":\n q.status = msg.topic;\n context.set(node.name, q);\n while (q.que.length>0){\n q.last = q.que.shift();\n node.send(q.last);\n context.set(node.name, q);\n }\n showStatus(\"green\");\n break;\n\n 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s;\n}","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":755,"y":280,"wires":[["14fb92879f805fd0"]],"l":false},{"id":"7df7bf76c194993a","type":"function","z":"a68c78a260d393d4","name":"out2","func":"const MAX_Q_LEN = 100;\n\nvar q = context.get(node.name) || {status: \"_PAUSE_\", last: {}, que:[]};\ncontext.set(node.name, q);\n\nswitch(msg.topic) {\n case \"_LAST_\":\n if (Object.keys(q.last) === 0) return;\n return q.last;\n\n case \"_DUMP_\":\n q.status = msg.topic;\n context.set(node.name, q);\n while (q.que.length>0){\n q.last = q.que.shift();\n }\n showStatus(\"yellow\");\n break;\n\n case \"_NEXT_\":\n if (q.status !== \"_PAUSE_\" || q.que.length === 0) return;\n node.send(q.que.shift());\n showStatus(\"yellow\");\n break;\n \n case \"_SKIP_\":\n if (q.status !== \"_PAUSE_\" || q.que.length === 0) return;\n q.que.shift();\n showStatus(\"yellow\");\n break;\n\n case \"_PAUSE_\":\n q.status = msg.topic;\n context.set(node.name, q);\n showStatus(\"yellow\");\n 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single step msg debug tool.","info":"","x":340,"y":40,"wires":[]},{"id":"6a4d510d.5de65","type":"ui_group","name":"","tab":"56715436.c2591c","order":2,"disp":false,"width":"9","collapse":false,"className":""},{"id":"56715436.c2591c","type":"ui_tab","name":"MsgDebug - node@14.17.5 red@2.1.3 dashboard@3.1.0","icon":"dashboard","order":3,"disabled":false,"hidden":false}]

```

---

<div class="post-metadata">

### Author: ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [6 November 2021 08:00 UTC](https://discourse.nodered.org/t/message-debug-function-node/53261/2 "2021-11-06T08:00:02Z")

</div>

Hi @ozpos thanks for sharing. Are you aware of the new [node-red debugger](https://flows.nodered.org/node/node-red-debugger)? It has many of the features you mention

---

<div class="post-metadata">

### Author: ![ozpos](https://avatars.discourse-cdn.com/v4/letter/o/278dde/32.png) [@ozpos](https://discourse.nodered.org/u/ozpos)
#### Post date: [6 November 2021 09:04 UTC](https://discourse.nodered.org/t/message-debug-function-node/53261/3 "2021-11-06T09:04:40Z")

</div>

You are welcome. No I was not aware of the debugger. While I was writing the node I thought it would be possible to do it in a less obtrusive way and for the whole platform.

Thank you for pointing it out.

---

<div class="post-metadata">

### Author: ![ozpos](https://avatars.discourse-cdn.com/v4/letter/o/278dde/32.png) [@ozpos](https://discourse.nodered.org/u/ozpos)
#### Post date: [6 November 2021 09:14 UTC](https://discourse.nodered.org/t/message-debug-function-node/53261/4 "2021-11-06T09:14:18Z")

</div>

Hi @Steve-Mcl, I have a strange history message with your tag and the edit icon along side. Sorry I do not fully understand the forum platform. Any idea what it means.

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/9/5/95cc88de50e66f9484638353a4270702343bea4f.png)

---

<div class="post-metadata">

### Author: ![Steve-Mcl](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/steve-mcl/32/4826_2.png) [@Steve-Mcl](https://discourse.nodered.org/u/Steve-Mcl)
#### Post date: [6 November 2021 09:28 UTC](https://discourse.nodered.org/t/message-debug-function-node/53261/5 "2021-11-06T09:28:16Z")

</div>

I changed the category of your post from general to [share your projects](https://discourse.nodered.org/c/share-your-projects/6) since you were sharing something you had created. Putting posts in correct category can make it clearer as to the content. For example your post title could mean several things but in the **share your projects** category, it adds context.

---

<div class="post-metadata">

### Author: ![ozpos](https://avatars.discourse-cdn.com/v4/letter/o/278dde/32.png) [@ozpos](https://discourse.nodered.org/u/ozpos)
#### Post date: [6 November 2021 09:34 UTC](https://discourse.nodered.org/t/message-debug-function-node/53261/6 "2021-11-06T09:34:47Z")

</div>

Thank you. I did not know where the best place was and had already changed the category once.

Sorry to bother you with such trivia, am I to do anything or does the History entry just stay like that as a record of who did what ?

---

<div class="post-metadata">

### Author: ![Paul-Reed](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/paul-reed/32/66906_2.png) [@Paul-Reed](https://discourse.nodered.org/u/Paul-Reed)
#### Post date: [6 November 2021 09:36 UTC](https://discourse.nodered.org/t/message-debug-function-node/53261/7 "2021-11-06T09:36:13Z")

</div>

It's just a record of changes. No need to do anything.

---

<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)
#### Post date: [5 January 2022 09:36 UTC](https://discourse.nodered.org/t/message-debug-function-node/53261/8 "2022-01-05T09:36:22Z")

</div>

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