I recently started studying the KDJ indicator more in-depth and found it very interesting how many people still underestimate this tool. People tend to complain that it’s very sensitive, but the real issue is that most don’t know how to set it up properly.

Basically, the KDJ has three lines: J, K, and D. The J line is the most volatile, constantly fluctuating. Then comes K, which is a bit more stable. And D is the calmest of the three. It’s important to understand this because each has its purpose.

At its core, the KDJ analyzes the relationship between the highest price, the lowest price, and the closing price. It incorporates concepts of momentum, relative strength, and moving averages. That’s why it works well for analyzing short- and medium-term trends. It’s one of the most widely used tools in technical analysis, especially in futures markets.

Now, the K and D values range from 0 to 100. J is different; it can go above 100 or below 0. When D is above 80, it indicates overbought conditions. Below 0, oversold. If J passes 100, it also signals overbought. If it drops below 0, oversold.

There are signals that are pure gold. When K crosses above D, it’s a buy signal. When K drops below D, it’s a sell signal. But here’s the catch: in a strong trending market, the KDJ tends to stay dormant and doesn’t send valid signals.

One thing I discovered is that the default parameter of 9 in the software isn’t the best. It makes the indicator too sensitive and generates a lot of noise. I experimented with 5, 19, and 25. All of them work better. It depends on the asset and the period you’re analyzing.

But there are some tricks most people don’t know. If the J line stays above 100 for three consecutive days, a short-term decline usually follows. If it stays below 0 for three days straight, a bottom is likely forming. These J signals don’t appear all the time, but when they do, they’re highly reliable.

In a rising market, when the price is above the 60-week moving average, and the weekly J drops below 0 and then closes above, it’s time to buy in batches. Conversely, in a falling market, when the price is below the 60-week moving average, you wait for J to stay passive below 0 before buying.

The downside is that KDJ has some pitfalls. After entering overbought or oversold zones, it tends to drift without doing anything. When using KD crossovers to trade, sometimes you end up buying at the top and selling at the bottom. Very frustrating.

But here’s the secret: forget about the normal signals and focus on the J value. Many experienced traders I know only look for J signals. When they appear, it’s because something important is happening. That’s really the essence of KDJ. If you learn to read it properly, it changes the game.